Nowadays, the exhaustion of electricity power in rural areas is becoming an important issue for many African Nations. Moreover, challenges include the high cost of extending the power grid to these locations, the economic health of the utilities and lack of revenue in impoverished villages. Numerous new initiatives are being implemented in the countries some of them co-financed by international organizations. In this paper, the hybrid microgrid is carried out as a feasible solution for a small rural village. A model of hybrid microgrid consisting of combination of photovoltaic (PV) panels and battery energy storage (BES) and a control system for managing the components of entire system to feed the village as local load is proposed. The control system must avoid the interruptions of power delivered to the consumers (village) and, therefore, good quality and reliability of the system is required. The PI controllers are used to regulate the voltage and current using three-phase dq transformation, while the parameters are determined using Ziegler-Nichols tuning method. The effectiveness of the proposed method is verified by simulation results given by Matlab/SimPowerSystems R environment.
Grid Connected PV System with Power Quality Improvement Using Intelligent Con...IJMTST Journal
The depletion of the fossil fuel resources and the global warming effects has led the world to think
seriously of other alternative sources of energy. So renewable energy resources (RES) are being connected to
the distribution systems, mostly done by using power electronic converters. But use of power electronic
converters and non-linear loads like at distribution level injects harmonics, which intern cause power quality
problems. Distribution static compensator (DSTATCOM) is very popular in compensating power problems for
nonlinear and unbalanced loads. Any change in the load affects the DC-link voltage (DCLV) directly.
Conventionally, a PI controller is used to maintain the DCLV to the reference value, but its transient response
is poor. So, fuzzy logic controller is proposed which shows better dynamic response. To trigger inverter HCC
is used. The proposed inverter with the control when connected to wind energy, helps the 3-phase 4-wire
linear/non-linear unbalanced load at point of common coupling appear as balanced linear load to the grid.
With MATLAB/Simulink simulation studies, the proposed control technique is demonstrated and evaluated
here.
Renewable microgrid operational results and economic evaluation using RETScre...IJECEIAES
This article describes the performance results of the first renewable microgrid of Chocó, Colombia, monitored over two years (2016-2017) adding an economic approach. A virtual platform is used to analyze, in real time, the microgrid power production, while a meteorological station measures the solar irradiance and the ambient temperature. The results indicated that the generation of AC PV energy was 21,817 kWh/year on 2016 and 23,301 kWh/year on 2017. The photovoltaic system’s average efficiency was 10.3 % on 2016 and 11.09 % on 2017. An economical analysis of the renewable microgrid is also presented using RETScreenTM software. The results show a net present value of $237,028 USD for an evaluation period of 25 years with annual energy savings of $4,622 USD. A calculation on greenhouse gas emissions show that 22.9 tCO2 per year are avoided when using the solar energy tech.
Fuzzy logic control of hybrid systems including renewable energy in microgrids IJECEIAES
With a growing demand for more energy from subscribers, a traditional electric grid is unable to meet new challenges, in the remote areas remains the extension of the conventional electric network very hard to do make prohibitively expensive. Therefore, a new advanced generation of traditional electrical is inevitable and indispensable to move toward an effective, economical, green, clean and self-correcting power system. The most well-known term used to define this next generation power system is micro grid (MG) based on renewable energy sources (RES). Since, the energy produced by RES are not constant at all times, a wide range of energy control techniques must be involved to provide a reliable power to consumers. To solve this problem in this paper we present a fuzzy logic control of isolated hybrid systems (HRES) including renewable energy in micro-grids to maintain a stability in voltage and frequency output especially in the standalone application. The considered HRES combine a wind turbine (WT) and photovoltaic (PV) panels as primary energy sources and an energy storage system (ESS) based on battery as a backup solution. Simulation results obtained from MATLAB/Simulink environment demonstrate the effectiveness of the proposed algorithm in decreasing the electricity bill of customer.
Operation and Control of Grid Connected Hybrid AC/DC Microgrid using Various RESIAES-IJPEDS
This paper proposes a Hybrid AC/DC Microgrid in alliance with Photo Voltaic (PV) energy, Wind Energy and Proton Exchange Membrane (PEM) Fuel cells. Microgrids are becoming increasingly attractive to the researchers because of the less greenhouse gases, low running cost, and flexibility to operate in connection with utility grid. The Hybrid AC/DC Microgrid constitutes independent AC and DC subgrids, where all the corresponding sources and loads are connected to their respective buses and these buses are interfaced using an interfacing converter. The Hybrid AC/DC Microgrid increases system efficiency by reducing the multiple reverse conversions involved in conventional RES integration to grid. A Small Hybrid AC/DC Microgrid in grid connected mode was modeled and simulated in MATLAB- SIMULINK environment. The simulation results prove the stable operation considering the uncertainty of generations and loads.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Grid Connected PV System with Power Quality Improvement Using Intelligent Con...IJMTST Journal
The depletion of the fossil fuel resources and the global warming effects has led the world to think
seriously of other alternative sources of energy. So renewable energy resources (RES) are being connected to
the distribution systems, mostly done by using power electronic converters. But use of power electronic
converters and non-linear loads like at distribution level injects harmonics, which intern cause power quality
problems. Distribution static compensator (DSTATCOM) is very popular in compensating power problems for
nonlinear and unbalanced loads. Any change in the load affects the DC-link voltage (DCLV) directly.
Conventionally, a PI controller is used to maintain the DCLV to the reference value, but its transient response
is poor. So, fuzzy logic controller is proposed which shows better dynamic response. To trigger inverter HCC
is used. The proposed inverter with the control when connected to wind energy, helps the 3-phase 4-wire
linear/non-linear unbalanced load at point of common coupling appear as balanced linear load to the grid.
With MATLAB/Simulink simulation studies, the proposed control technique is demonstrated and evaluated
here.
Renewable microgrid operational results and economic evaluation using RETScre...IJECEIAES
This article describes the performance results of the first renewable microgrid of Chocó, Colombia, monitored over two years (2016-2017) adding an economic approach. A virtual platform is used to analyze, in real time, the microgrid power production, while a meteorological station measures the solar irradiance and the ambient temperature. The results indicated that the generation of AC PV energy was 21,817 kWh/year on 2016 and 23,301 kWh/year on 2017. The photovoltaic system’s average efficiency was 10.3 % on 2016 and 11.09 % on 2017. An economical analysis of the renewable microgrid is also presented using RETScreenTM software. The results show a net present value of $237,028 USD for an evaluation period of 25 years with annual energy savings of $4,622 USD. A calculation on greenhouse gas emissions show that 22.9 tCO2 per year are avoided when using the solar energy tech.
Fuzzy logic control of hybrid systems including renewable energy in microgrids IJECEIAES
With a growing demand for more energy from subscribers, a traditional electric grid is unable to meet new challenges, in the remote areas remains the extension of the conventional electric network very hard to do make prohibitively expensive. Therefore, a new advanced generation of traditional electrical is inevitable and indispensable to move toward an effective, economical, green, clean and self-correcting power system. The most well-known term used to define this next generation power system is micro grid (MG) based on renewable energy sources (RES). Since, the energy produced by RES are not constant at all times, a wide range of energy control techniques must be involved to provide a reliable power to consumers. To solve this problem in this paper we present a fuzzy logic control of isolated hybrid systems (HRES) including renewable energy in micro-grids to maintain a stability in voltage and frequency output especially in the standalone application. The considered HRES combine a wind turbine (WT) and photovoltaic (PV) panels as primary energy sources and an energy storage system (ESS) based on battery as a backup solution. Simulation results obtained from MATLAB/Simulink environment demonstrate the effectiveness of the proposed algorithm in decreasing the electricity bill of customer.
Operation and Control of Grid Connected Hybrid AC/DC Microgrid using Various RESIAES-IJPEDS
This paper proposes a Hybrid AC/DC Microgrid in alliance with Photo Voltaic (PV) energy, Wind Energy and Proton Exchange Membrane (PEM) Fuel cells. Microgrids are becoming increasingly attractive to the researchers because of the less greenhouse gases, low running cost, and flexibility to operate in connection with utility grid. The Hybrid AC/DC Microgrid constitutes independent AC and DC subgrids, where all the corresponding sources and loads are connected to their respective buses and these buses are interfaced using an interfacing converter. The Hybrid AC/DC Microgrid increases system efficiency by reducing the multiple reverse conversions involved in conventional RES integration to grid. A Small Hybrid AC/DC Microgrid in grid connected mode was modeled and simulated in MATLAB- SIMULINK environment. The simulation results prove the stable operation considering the uncertainty of generations and loads.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
GA Based Controller for Autonomous Wind-DG Micro gridIOSRJEEE
A single renewable source of energy when integrated with other sources of energy it is termed as hybrid system. In this paper an active power control strategy has been developed such that when the wind alone is not able to meet the energy demand, without compromising the frequency a transition occurs to wind diesel mode so that the energy demand is met. This work proposes the coordination of WDG(Wind DG), VSC’s are used for two purposes one is frequency control and another is voltage control. PMBLDC generator is used as a wind power generator and the Incremental conductance method is used as MPPT along with boost converter. This output is stored into battery system (BS) and surplus is supplied to the consumer loads. Back propagation feed forward (BPFF) control scheme is used for VF control of VSC. This controller provides harmonics elimination, load leveling and reactive power compensation and also regulates the voltage at PCC. Genetic algorithm is used for the purpose of tuning PI controller of BPFF. The performance and the analysis is done in a user friendly MATLAB/Simulink environment.
This paper describes the Grid connected solar photovoltaique system using DC-DC boost converter and the DC/AC inverter (VSC) to supplies electric power to the utility grid. The model contains a representation of the main components of the system that are two solar arrays of 100 kW, boost converter and the grid side inverter. The paper starts with a system description, in this part we have given a definition and a short overview of every component used in this system and they are taken separately. The PV cell model is easy, accurate, and takes external temperature and solar radiation into consideration. It also proposes a maximum power point tracking (MPPT) algorithm. The algorithm incorporated in a DC/DC converter is used to track the maximum power of PV cell. Finally, the DC/AC inverter (VSC) of three- level is used to regulate the ouput voltage of DC/DC converter and connects the PV cell to the grid. Simulation results show how a solar radiation’s change can affect the power output of any PV system, also they show the control performance and dynamic behavior of the grid connected photovoltaic system.
Control for Grid Connected and Intentional Islanding of Distributed Power Gen...ijtsrd
As the demand for more reliable and secure power system with greater power quality increases, the concept of distributed generation DG have become more popular. This popularity of DG concept has developed simultaneously with the decrease in manufacturing costs associated with clean and alternative technologies like fuel cells, biomass, micro turbine and solar cell systems. Intentional islanding is the purposeful sectionalisation of the utility system during widespread disturbances to create power “islandâ€. This island can be designed to maintain a continuous supply of power during disturbances of the main distribution system. Ruchali Borkute | Nikita Malwar ""Control for Grid Connected and Intentional Islanding of Distributed Power Generation"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23679.pdf
Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/23679/control-for-grid-connected-and-intentional-islanding-of-distributed-power-generation/ruchali-borkute
Performance analysis of grid-tied photovoltaic system under varying weather c...IJECEIAES
Model and simulation of the impact of the distribution grid-tied photovoltaic (PV) system feeding a variable load with its control system have been investigated in this study. Incremental Conductance (IncCond) algorithm based on maximum power point tracking (MPPT) was implemented for the PV system to extract maximum power under different weather conditions when solar irradiation varies between 250 W/m 2 and 1000 W/m 2 . The proposed system is modelled and simulated with MATLAB/Simulink tools. Under different weather conditions, the dynamic performance of the PV system is evaluated. The results obtained show the efficacy of the proposed MPPT method in response to rapid daytime weather variations. The results also show that the surplus power generated is injected into the grid when the injected power from the PV system is higher than the load demand; otherwise, the grid supplies the load.
Electric Vehicle as an Energy Storage for Grid Connected Solar Power SystemIAES-IJPEDS
In the past few years the growing demand for electricity and serious concern
for the environment have given rise to the growth of sustainable sources like
wind, solar, tidal, biomass etc. The technological advancement in power
electronics has led to the extensive usage of solar power. Solar power output
varies with the weather conditions and under shading conditions. With the
increasing concerns of the impacts of the high penetration of Photovoltaic
(PV) systems, a technical study about their effects on the power quality of
the utility grid is required. This paper investigates the functioning of a gridtied
PV system along with maximum power point tracking (MPPT)
algorithm. The effects of varying atmospheric conditions like solar irradiance
and temperature are also taken into account. It is proposed in this work that
an Electric Vehicle (EV) can be used as an energy storage to stabilize the
power supplied to the grid from the photovoltaic resources. A coordinated
control is necessary for the EV to obtain desired outcome. The modeling of
the PV and EV system is carried out in PSCAD and the proposed idea is
verified through simulation results utilizing real field data for solar irradiance
and temperature.
Integrated arrangement of advanced power electronics through hybrid smart gri...TELKOMNIKA JOURNAL
As an enabler component for renewable energy integration, power electronics (PE) technology in smart grid system is one of the most important issues of development the electrification, decentralization and information-technology/operation-technology (IT/OT) digitization within the electrical energy transmission and distribution systems. The arrangement of PE may different along the feeder either for grid-connected photovoltaic (PV), wind turbine, fuel cells, wave energy system and battery storage unit, respectively.This is due to the electric voltage that might need to be converted from alternating current (AC) to direct current (DC) and vice versa. For that reason, this paper proposed a concept of advanced PE as an integrated arrangement of several AC/DC/AC-and DC/AC- converters in such ways that support thepreviously mentioned grid-connected hybrid renewable energy sources and distributed generators (DGs) along the distribution feeder. Additionally, for the system that supported by battery storage unit, then this hybrid smart grid concept might become the answer for future utility needs.
Attempting to reduce the existing electricity consumption bill, as well as the stability and non-outage grid recharge with the lowest possible cost and suitable quality, is one of the most important goals for those interested in energy around the world. This paper study the circumstances surrounding the Egyptian society to find the best solutions to a achieved this goals, and it was found that solar energy is one of the best alternatives available for energy. Firstly will be study the electricity consumption bill, slice prices and a program was made to calculate the consumption invoice moreover another program for quick estimation to the proposed solar system.The proposed system provides a smart integration between the solar system and grid, where the supply sustainability and the optimal cost are considered. This configuration allows the two sources separately or simultaneously supply the loads depending on photovoltaic extracted energy. Operational analysis of the proposed system will discussed in this paper. The proposed system consists of solar cells, charge controller, batteries and inverter plugged to automatic transfer switches (ATS) using Programmable Logic Control (PLC). The system grantee a safe and reliable load feeding independently on the grid status. The system durability is the most depicted feature through the modelling and experimentally results. A typical case studies for about four years of non-outages photovoltaic-grid hybrid supply (the implemented system) will be presented and discussed.
Intelligent controller based power quality improvement of microgrid integrati...IJECEIAES
Now a day the power demand has a major problem for developing countries due to the growth of population, industries, IT companies and other needs. In this present situation the fossil fuel-based power generation alone does not support the consumer needs, poor power quality due to nonlinear function and very harmful for environment. The main objective of this paper is improving the power quality of grid connected photovoltaic power system through a new cascade H-bridge multilevel inverter. The proposed research work has been modelled and controlled by ANFIS intelligence in MATLAB simulation environment. The simulation results are analysed under various operating conditions for improve the performance of proposed system. Finally, the proposed system THD value of simulation results is compared with IEEE 1547 standard for prove the effectiveness of proposed research work.
Implementation of a Voltage Multiplier based on High Step-up Converter using FLCIJMTST Journal
A Front end of the Photovoltaic Solar Panel is been proposed based on Step-Up Converter. The use of
distributed energy resources is increasingly being pursued as a supplement and an alternative to large
conventional central power stations. The specification of a power electronic interface is subject to
requirements related not only to the renewable energy source itself but also to its effects on the power-system
operation, especially where the intermittent energy source constitutes a significant part of the total system
capacity. Implementing a voltage multiplier module, an asymmetrical interleaved high step-up converter
obtains high step-up gain without operating at an extreme duty ratio. The voltage multiplier module is
composed of a conventional boost converter and coupled inductors. An extra conventional boost converter is
integrated into the first phase to achieve a considerably higher voltage conversion ratio. The two-phase
configuration not only reduces the current stress through each power switch, but also constrains the input
current ripple, which decreases the conduction losses of metal–oxide–semiconductor field-effect transistors.
In addition, the proposed converter functions as an active clamp circuit, which alleviates large voltage spikes
across the power switches. Finally, the simulation circuitry with a 40V input voltage and 230V output voltage
is operated to verify its performance analysis with respect to the Fuzzy Logic Controller. The highest
efficiency is 97.75%.
Proposed PV Transformer-Less Inverter Topology Technique for Leakage Current ...IJPEDS-IAES
Importance and demand of using renewable energy is dramatically escalated globally. Hence, the use of renewable energy is going to touch in peak. This demand is varying according to the site choosing. For instance, Wind is preferable where air is following highly as well as solar recommended place is high sun ray reducing places. Especially, the renewable system is highly recommended for electrification issues where it’s possible to produce the electricity for fulfilling rural and remote areas electricity problem. The photovoltaic (PV) panel of connecting with transformer based system is popular where some limitations are occurred especially cost and weight. In contrast, in this paper is focusing these issues where the transformer-less inverter system is used. Here will discuss some transformer-based and transformer-less inverter topologies and the leakage current issue which is occurred when transformer-less inverter system is used. Moreover, here is proposed a topology for reducing the leakage current after doing switching technique in both 50% and 75% duty cycle where output voltage remains quite same.
A non-isolated tri-port converter is a fully compact and functional system by the integration of basic converters. This can be used for renewable energy applications. This converter is capable of achieving different switching patterns of power flow between the source and load, interfaced sources of various voltage and current levels with the dc grid. This tri-port converter has to be used for continuous power distribution of rechargeable battery, photovoltaic panels and load. Due to the implementation of this dc-dc converter some operations like buck, boost and buck-boost operations became easy. Use of this converter helps in easy implementation of the system. The solar PV panel implementation boosts the system to a high level and bidirectional flow became easy from source to load and vice versa.
GA Based Controller for Autonomous Wind-DG Micro gridIOSRJEEE
A single renewable source of energy when integrated with other sources of energy it is termed as hybrid system. In this paper an active power control strategy has been developed such that when the wind alone is not able to meet the energy demand, without compromising the frequency a transition occurs to wind diesel mode so that the energy demand is met. This work proposes the coordination of WDG(Wind DG), VSC’s are used for two purposes one is frequency control and another is voltage control. PMBLDC generator is used as a wind power generator and the Incremental conductance method is used as MPPT along with boost converter. This output is stored into battery system (BS) and surplus is supplied to the consumer loads. Back propagation feed forward (BPFF) control scheme is used for VF control of VSC. This controller provides harmonics elimination, load leveling and reactive power compensation and also regulates the voltage at PCC. Genetic algorithm is used for the purpose of tuning PI controller of BPFF. The performance and the analysis is done in a user friendly MATLAB/Simulink environment.
This paper describes the Grid connected solar photovoltaique system using DC-DC boost converter and the DC/AC inverter (VSC) to supplies electric power to the utility grid. The model contains a representation of the main components of the system that are two solar arrays of 100 kW, boost converter and the grid side inverter. The paper starts with a system description, in this part we have given a definition and a short overview of every component used in this system and they are taken separately. The PV cell model is easy, accurate, and takes external temperature and solar radiation into consideration. It also proposes a maximum power point tracking (MPPT) algorithm. The algorithm incorporated in a DC/DC converter is used to track the maximum power of PV cell. Finally, the DC/AC inverter (VSC) of three- level is used to regulate the ouput voltage of DC/DC converter and connects the PV cell to the grid. Simulation results show how a solar radiation’s change can affect the power output of any PV system, also they show the control performance and dynamic behavior of the grid connected photovoltaic system.
Control for Grid Connected and Intentional Islanding of Distributed Power Gen...ijtsrd
As the demand for more reliable and secure power system with greater power quality increases, the concept of distributed generation DG have become more popular. This popularity of DG concept has developed simultaneously with the decrease in manufacturing costs associated with clean and alternative technologies like fuel cells, biomass, micro turbine and solar cell systems. Intentional islanding is the purposeful sectionalisation of the utility system during widespread disturbances to create power “islandâ€. This island can be designed to maintain a continuous supply of power during disturbances of the main distribution system. Ruchali Borkute | Nikita Malwar ""Control for Grid Connected and Intentional Islanding of Distributed Power Generation"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23679.pdf
Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/23679/control-for-grid-connected-and-intentional-islanding-of-distributed-power-generation/ruchali-borkute
Performance analysis of grid-tied photovoltaic system under varying weather c...IJECEIAES
Model and simulation of the impact of the distribution grid-tied photovoltaic (PV) system feeding a variable load with its control system have been investigated in this study. Incremental Conductance (IncCond) algorithm based on maximum power point tracking (MPPT) was implemented for the PV system to extract maximum power under different weather conditions when solar irradiation varies between 250 W/m 2 and 1000 W/m 2 . The proposed system is modelled and simulated with MATLAB/Simulink tools. Under different weather conditions, the dynamic performance of the PV system is evaluated. The results obtained show the efficacy of the proposed MPPT method in response to rapid daytime weather variations. The results also show that the surplus power generated is injected into the grid when the injected power from the PV system is higher than the load demand; otherwise, the grid supplies the load.
Electric Vehicle as an Energy Storage for Grid Connected Solar Power SystemIAES-IJPEDS
In the past few years the growing demand for electricity and serious concern
for the environment have given rise to the growth of sustainable sources like
wind, solar, tidal, biomass etc. The technological advancement in power
electronics has led to the extensive usage of solar power. Solar power output
varies with the weather conditions and under shading conditions. With the
increasing concerns of the impacts of the high penetration of Photovoltaic
(PV) systems, a technical study about their effects on the power quality of
the utility grid is required. This paper investigates the functioning of a gridtied
PV system along with maximum power point tracking (MPPT)
algorithm. The effects of varying atmospheric conditions like solar irradiance
and temperature are also taken into account. It is proposed in this work that
an Electric Vehicle (EV) can be used as an energy storage to stabilize the
power supplied to the grid from the photovoltaic resources. A coordinated
control is necessary for the EV to obtain desired outcome. The modeling of
the PV and EV system is carried out in PSCAD and the proposed idea is
verified through simulation results utilizing real field data for solar irradiance
and temperature.
Integrated arrangement of advanced power electronics through hybrid smart gri...TELKOMNIKA JOURNAL
As an enabler component for renewable energy integration, power electronics (PE) technology in smart grid system is one of the most important issues of development the electrification, decentralization and information-technology/operation-technology (IT/OT) digitization within the electrical energy transmission and distribution systems. The arrangement of PE may different along the feeder either for grid-connected photovoltaic (PV), wind turbine, fuel cells, wave energy system and battery storage unit, respectively.This is due to the electric voltage that might need to be converted from alternating current (AC) to direct current (DC) and vice versa. For that reason, this paper proposed a concept of advanced PE as an integrated arrangement of several AC/DC/AC-and DC/AC- converters in such ways that support thepreviously mentioned grid-connected hybrid renewable energy sources and distributed generators (DGs) along the distribution feeder. Additionally, for the system that supported by battery storage unit, then this hybrid smart grid concept might become the answer for future utility needs.
Attempting to reduce the existing electricity consumption bill, as well as the stability and non-outage grid recharge with the lowest possible cost and suitable quality, is one of the most important goals for those interested in energy around the world. This paper study the circumstances surrounding the Egyptian society to find the best solutions to a achieved this goals, and it was found that solar energy is one of the best alternatives available for energy. Firstly will be study the electricity consumption bill, slice prices and a program was made to calculate the consumption invoice moreover another program for quick estimation to the proposed solar system.The proposed system provides a smart integration between the solar system and grid, where the supply sustainability and the optimal cost are considered. This configuration allows the two sources separately or simultaneously supply the loads depending on photovoltaic extracted energy. Operational analysis of the proposed system will discussed in this paper. The proposed system consists of solar cells, charge controller, batteries and inverter plugged to automatic transfer switches (ATS) using Programmable Logic Control (PLC). The system grantee a safe and reliable load feeding independently on the grid status. The system durability is the most depicted feature through the modelling and experimentally results. A typical case studies for about four years of non-outages photovoltaic-grid hybrid supply (the implemented system) will be presented and discussed.
Intelligent controller based power quality improvement of microgrid integrati...IJECEIAES
Now a day the power demand has a major problem for developing countries due to the growth of population, industries, IT companies and other needs. In this present situation the fossil fuel-based power generation alone does not support the consumer needs, poor power quality due to nonlinear function and very harmful for environment. The main objective of this paper is improving the power quality of grid connected photovoltaic power system through a new cascade H-bridge multilevel inverter. The proposed research work has been modelled and controlled by ANFIS intelligence in MATLAB simulation environment. The simulation results are analysed under various operating conditions for improve the performance of proposed system. Finally, the proposed system THD value of simulation results is compared with IEEE 1547 standard for prove the effectiveness of proposed research work.
Implementation of a Voltage Multiplier based on High Step-up Converter using FLCIJMTST Journal
A Front end of the Photovoltaic Solar Panel is been proposed based on Step-Up Converter. The use of
distributed energy resources is increasingly being pursued as a supplement and an alternative to large
conventional central power stations. The specification of a power electronic interface is subject to
requirements related not only to the renewable energy source itself but also to its effects on the power-system
operation, especially where the intermittent energy source constitutes a significant part of the total system
capacity. Implementing a voltage multiplier module, an asymmetrical interleaved high step-up converter
obtains high step-up gain without operating at an extreme duty ratio. The voltage multiplier module is
composed of a conventional boost converter and coupled inductors. An extra conventional boost converter is
integrated into the first phase to achieve a considerably higher voltage conversion ratio. The two-phase
configuration not only reduces the current stress through each power switch, but also constrains the input
current ripple, which decreases the conduction losses of metal–oxide–semiconductor field-effect transistors.
In addition, the proposed converter functions as an active clamp circuit, which alleviates large voltage spikes
across the power switches. Finally, the simulation circuitry with a 40V input voltage and 230V output voltage
is operated to verify its performance analysis with respect to the Fuzzy Logic Controller. The highest
efficiency is 97.75%.
Proposed PV Transformer-Less Inverter Topology Technique for Leakage Current ...IJPEDS-IAES
Importance and demand of using renewable energy is dramatically escalated globally. Hence, the use of renewable energy is going to touch in peak. This demand is varying according to the site choosing. For instance, Wind is preferable where air is following highly as well as solar recommended place is high sun ray reducing places. Especially, the renewable system is highly recommended for electrification issues where it’s possible to produce the electricity for fulfilling rural and remote areas electricity problem. The photovoltaic (PV) panel of connecting with transformer based system is popular where some limitations are occurred especially cost and weight. In contrast, in this paper is focusing these issues where the transformer-less inverter system is used. Here will discuss some transformer-based and transformer-less inverter topologies and the leakage current issue which is occurred when transformer-less inverter system is used. Moreover, here is proposed a topology for reducing the leakage current after doing switching technique in both 50% and 75% duty cycle where output voltage remains quite same.
A non-isolated tri-port converter is a fully compact and functional system by the integration of basic converters. This can be used for renewable energy applications. This converter is capable of achieving different switching patterns of power flow between the source and load, interfaced sources of various voltage and current levels with the dc grid. This tri-port converter has to be used for continuous power distribution of rechargeable battery, photovoltaic panels and load. Due to the implementation of this dc-dc converter some operations like buck, boost and buck-boost operations became easy. Use of this converter helps in easy implementation of the system. The solar PV panel implementation boosts the system to a high level and bidirectional flow became easy from source to load and vice versa.
Power Quality Improvement with Multilevel Inverter Based IPQC for MicrogridIJMTST Journal
A micro grid is a hybrid power system consists of several distributed resources and local loads .Now a
days with increasing on a day to day life micro grid plays a vital role in power generation using Renewable
Energy Sources. Usage of power electronic devices in a micro grid results in harmonic generation and leads to
various power quality issues. Inorder to overcome voltage fluctuations and over current a magnetic flux
control based variable reactor is proposed. The performance of IPQC can be verified by using
MATLAB/SIMULINK`
Open-Switch Fault-Tolerant Control of Power Converters in a Grid-Connected Ph...IAES-IJPEDS
This paper presents the study of an open switch fault tolerant control of a
grid-connected photovoltaic system. The studied system is based on the
classical DC-DC boost converter and a bidirectional 6-pulse DC-AC
converter. The objective is to provide an open-switch fault detection method
and fault-tolerant control for both of boost converter and grid-side converter
(GSC) in a grid-connected photovoltaic system. A fast fault detection method
and a reliable fault-tolerant topology are required to ensure continuity of
service, and achieve a faster corrective maintenance. In this work, the mean
value of the error voltages is used as fault indicator for the GSC, while, for
the boost converter the inductor current form is used as fault indicator. The
fault-tolerant topology was achieved by adding one redundant switch to the
boost converter, and by adding one redundant leg to the GSC. The results of
the fault tolerant control are presented and discussed to validate the proposed
approach under different scenarios and different solar irradiances.
Droop control method for parallel dc converters used in standalone pv wind po...eSAT Journals
Abstract The rising rate of consumption and price of fossil fuel along with environmental pollution by conventional power generation draw global attention to renewable energy sources and technology. Paper gives analysis study on current sharing issues of parallel DC converters in standalone photovoltaic (PV) WIND system. Solar wind power generating system with maximum power point tracking (MPPT) technique – incremental conductance method is used for the simulation analysis. The main drawbacks of parallel converters used in system are poor power sharing and voltage drop. The paper describes about instantaneous droop calculation considering effect of cable resistance using droop index to improve the power sharing performance. The control technique is simulated using MATLAB/SIMULINK in PV- wind power generating system with MPPT and case study has been done on the control strategy and verifies the effectiveness of adaptive droop control on output converter voltage. Key Words: Microgrid; droop method; incremental conductance (Incond); maximum power point tracking (MPPT).
PHYSICAL DESIGN AND MODELING OF 25V DC-DC BOOST CONVERTER FOR STAND ALONE SOL...ecij
As per the present development the shortage in power all over the world seems to be abundance. Renewable energy sources are the capable energy source along with the accessible resources of energy. Among all the renewable resources of energy, solar PV technology is most acceptable due to its
considerable advantage over other form of renewable sources. Calculating the output of PV system is a key aspect. The main principle of this paper is to present physical modeling and simulation of solar PV system and DC-DC boost converter in SIMSCAPE library of MATLAB. The benefit by SIMSCAPE library is that it models the system physically and the outcome obtains from it will be considering all the physical result. In
this paper the output of solar cell has been interfaced with the boost converter. The system model in SIMSCAPE can be directly converted into hardware for implement for actual time application.
Improved Power Quality by using STATCOM Under Various Loading ConditionsIJMTST Journal
A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that
results in a failure or a mis-operation of end user equipment’s. Utility distribution networks, sensitive
industrial loads and critical commercial operations suffer from various types of outages and service
interruptions which can cost significant financial losses. With the restructuring of power systems and with
shifting trend towards distributed and dispersed generation, the issue of power quality is going to take
newer dimensions. Injection of the wind power into an electric grid affects the power quality. The
performance of the wind turbine and thereby power quality are determined on the basis of measurements
and the norms followed according to the guideline specified in International Electro-technical Commission
standard, IEC-61400. The influence of the wind turbine in the grid system concerning the power quality
measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical
behavior of switching operation and these are measured according to national/international guidelines.
Static Compensator (STATCOM) is connected at a point of common coupling with a battery energy storage
system (BESS) to mitigate the power quality issues. The battery energy storage is integrated to sustain the
real power source under fluctuating wind power. Here two control schemes for STATCOM are Fuzzy logic
controller and hybrid Fuzzy logic controller. We can better response for hybrid fuzzy compare to fuzzy logic
controller. The STATCOM control scheme for the grid connected wind energy generation system for power
quality improvement is simulated using MATLAB/SIMULINK in power system block set. Finally the proposed
scheme is applied for both balanced and unbalanced linear nonlinear loads.
Distributed energy resources (DER) based micro grid and Nano-grid framework is most technically viable bottom-top approach to sustainably meet ever-increasing demand of rural and urban communities. Recently the growth of DC operative home appliances like mobile and lap top chargers, ovens and hair dryer’s etc. are increasing and therefore a DC/DC converter is an efficient way to meet the electricity need from the local DER and helps in improving the system efficiency. This paper presents simulation results of a buck boost converter, MPPT algorithm (P & O method) for solar PV module and closed loop PI control system for obtaining constant 12 V and 24 V DC output voltage at DC bus. The proposed methodology is to extract maximum DC power from solar PV system and it is directly fed to DC load or DC Nano grid.
Bibliometric analysis highlighting the role of women in addressing climate ch...IJECEIAES
Fossil fuel consumption increased quickly, contributing to climate change
that is evident in unusual flooding and draughts, and global warming. Over
the past ten years, women's involvement in society has grown dramatically,
and they succeeded in playing a noticeable role in reducing climate change.
A bibliometric analysis of data from the last ten years has been carried out to
examine the role of women in addressing the climate change. The analysis's
findings discussed the relevant to the sustainable development goals (SDGs),
particularly SDG 7 and SDG 13. The results considered contributions made
by women in the various sectors while taking geographic dispersion into
account. The bibliometric analysis delves into topics including women's
leadership in environmental groups, their involvement in policymaking, their
contributions to sustainable development projects, and the influence of
gender diversity on attempts to mitigate climate change. This study's results
highlight how women have influenced policies and actions related to climate
change, point out areas of research deficiency and recommendations on how
to increase role of the women in addressing the climate change and
achieving sustainability. To achieve more successful results, this initiative
aims to highlight the significance of gender equality and encourage
inclusivity in climate change decision-making processes.
Voltage and frequency control of microgrid in presence of micro-turbine inter...IJECEIAES
The active and reactive load changes have a significant impact on voltage
and frequency. In this paper, in order to stabilize the microgrid (MG) against
load variations in islanding mode, the active and reactive power of all
distributed generators (DGs), including energy storage (battery), diesel
generator, and micro-turbine, are controlled. The micro-turbine generator is
connected to MG through a three-phase to three-phase matrix converter, and
the droop control method is applied for controlling the voltage and
frequency of MG. In addition, a method is introduced for voltage and
frequency control of micro-turbines in the transition state from gridconnected mode to islanding mode. A novel switching strategy of the matrix
converter is used for converting the high-frequency output voltage of the
micro-turbine to the grid-side frequency of the utility system. Moreover,
using the switching strategy, the low-order harmonics in the output current
and voltage are not produced, and consequently, the size of the output filter
would be reduced. In fact, the suggested control strategy is load-independent
and has no frequency conversion restrictions. The proposed approach for
voltage and frequency regulation demonstrates exceptional performance and
favorable response across various load alteration scenarios. The suggested
strategy is examined in several scenarios in the MG test systems, and the
simulation results are addressed.
Enhancing battery system identification: nonlinear autoregressive modeling fo...IJECEIAES
Precisely characterizing Li-ion batteries is essential for optimizing their
performance, enhancing safety, and prolonging their lifespan across various
applications, such as electric vehicles and renewable energy systems. This
article introduces an innovative nonlinear methodology for system
identification of a Li-ion battery, employing a nonlinear autoregressive with
exogenous inputs (NARX) model. The proposed approach integrates the
benefits of nonlinear modeling with the adaptability of the NARX structure,
facilitating a more comprehensive representation of the intricate
electrochemical processes within the battery. Experimental data collected
from a Li-ion battery operating under diverse scenarios are employed to
validate the effectiveness of the proposed methodology. The identified
NARX model exhibits superior accuracy in predicting the battery's behavior
compared to traditional linear models. This study underscores the
importance of accounting for nonlinearities in battery modeling, providing
insights into the intricate relationships between state-of-charge, voltage, and
current under dynamic conditions.
Smart grid deployment: from a bibliometric analysis to a surveyIJECEIAES
Smart grids are one of the last decades' innovations in electrical energy.
They bring relevant advantages compared to the traditional grid and
significant interest from the research community. Assessing the field's
evolution is essential to propose guidelines for facing new and future smart
grid challenges. In addition, knowing the main technologies involved in the
deployment of smart grids (SGs) is important to highlight possible
shortcomings that can be mitigated by developing new tools. This paper
contributes to the research trends mentioned above by focusing on two
objectives. First, a bibliometric analysis is presented to give an overview of
the current research level about smart grid deployment. Second, a survey of
the main technological approaches used for smart grid implementation and
their contributions are highlighted. To that effect, we searched the Web of
Science (WoS), and the Scopus databases. We obtained 5,663 documents
from WoS and 7,215 from Scopus on smart grid implementation or
deployment. With the extraction limitation in the Scopus database, 5,872 of
the 7,215 documents were extracted using a multi-step process. These two
datasets have been analyzed using a bibliometric tool called bibliometrix.
The main outputs are presented with some recommendations for future
research.
Use of analytical hierarchy process for selecting and prioritizing islanding ...IJECEIAES
One of the problems that are associated to power systems is islanding
condition, which must be rapidly and properly detected to prevent any
negative consequences on the system's protection, stability, and security.
This paper offers a thorough overview of several islanding detection
strategies, which are divided into two categories: classic approaches,
including local and remote approaches, and modern techniques, including
techniques based on signal processing and computational intelligence.
Additionally, each approach is compared and assessed based on several
factors, including implementation costs, non-detected zones, declining
power quality, and response times using the analytical hierarchy process
(AHP). The multi-criteria decision-making analysis shows that the overall
weight of passive methods (24.7%), active methods (7.8%), hybrid methods
(5.6%), remote methods (14.5%), signal processing-based methods (26.6%),
and computational intelligent-based methods (20.8%) based on the
comparison of all criteria together. Thus, it can be seen from the total weight
that hybrid approaches are the least suitable to be chosen, while signal
processing-based methods are the most appropriate islanding detection
method to be selected and implemented in power system with respect to the
aforementioned factors. Using Expert Choice software, the proposed
hierarchy model is studied and examined.
Enhancing of single-stage grid-connected photovoltaic system using fuzzy logi...IJECEIAES
The power generated by photovoltaic (PV) systems is influenced by
environmental factors. This variability hampers the control and utilization of
solar cells' peak output. In this study, a single-stage grid-connected PV
system is designed to enhance power quality. Our approach employs fuzzy
logic in the direct power control (DPC) of a three-phase voltage source
inverter (VSI), enabling seamless integration of the PV connected to the
grid. Additionally, a fuzzy logic-based maximum power point tracking
(MPPT) controller is adopted, which outperforms traditional methods like
incremental conductance (INC) in enhancing solar cell efficiency and
minimizing the response time. Moreover, the inverter's real-time active and
reactive power is directly managed to achieve a unity power factor (UPF).
The system's performance is assessed through MATLAB/Simulink
implementation, showing marked improvement over conventional methods,
particularly in steady-state and varying weather conditions. For solar
irradiances of 500 and 1,000 W/m2
, the results show that the proposed
method reduces the total harmonic distortion (THD) of the injected current
to the grid by approximately 46% and 38% compared to conventional
methods, respectively. Furthermore, we compare the simulation results with
IEEE standards to evaluate the system's grid compatibility.
Enhancing photovoltaic system maximum power point tracking with fuzzy logic-b...IJECEIAES
Photovoltaic systems have emerged as a promising energy resource that
caters to the future needs of society, owing to their renewable, inexhaustible,
and cost-free nature. The power output of these systems relies on solar cell
radiation and temperature. In order to mitigate the dependence on
atmospheric conditions and enhance power tracking, a conventional
approach has been improved by integrating various methods. To optimize
the generation of electricity from solar systems, the maximum power point
tracking (MPPT) technique is employed. To overcome limitations such as
steady-state voltage oscillations and improve transient response, two
traditional MPPT methods, namely fuzzy logic controller (FLC) and perturb
and observe (P&O), have been modified. This research paper aims to
simulate and validate the step size of the proposed modified P&O and FLC
techniques within the MPPT algorithm using MATLAB/Simulink for
efficient power tracking in photovoltaic systems.
Adaptive synchronous sliding control for a robot manipulator based on neural ...IJECEIAES
Robot manipulators have become important equipment in production lines, medical fields, and transportation. Improving the quality of trajectory tracking for
robot hands is always an attractive topic in the research community. This is a
challenging problem because robot manipulators are complex nonlinear systems
and are often subject to fluctuations in loads and external disturbances. This
article proposes an adaptive synchronous sliding control scheme to improve trajectory tracking performance for a robot manipulator. The proposed controller
ensures that the positions of the joints track the desired trajectory, synchronize
the errors, and significantly reduces chattering. First, the synchronous tracking
errors and synchronous sliding surfaces are presented. Second, the synchronous
tracking error dynamics are determined. Third, a robust adaptive control law is
designed,the unknown components of the model are estimated online by the neural network, and the parameters of the switching elements are selected by fuzzy
logic. The built algorithm ensures that the tracking and approximation errors
are ultimately uniformly bounded (UUB). Finally, the effectiveness of the constructed algorithm is demonstrated through simulation and experimental results.
Simulation and experimental results show that the proposed controller is effective with small synchronous tracking errors, and the chattering phenomenon is
significantly reduced.
Remote field-programmable gate array laboratory for signal acquisition and de...IJECEIAES
A remote laboratory utilizing field-programmable gate array (FPGA) technologies enhances students’ learning experience anywhere and anytime in embedded system design. Existing remote laboratories prioritize hardware access and visual feedback for observing board behavior after programming, neglecting comprehensive debugging tools to resolve errors that require internal signal acquisition. This paper proposes a novel remote embeddedsystem design approach targeting FPGA technologies that are fully interactive via a web-based platform. Our solution provides FPGA board access and debugging capabilities beyond the visual feedback provided by existing remote laboratories. We implemented a lab module that allows users to seamlessly incorporate into their FPGA design. The module minimizes hardware resource utilization while enabling the acquisition of a large number of data samples from the signal during the experiments by adaptively compressing the signal prior to data transmission. The results demonstrate an average compression ratio of 2.90 across three benchmark signals, indicating efficient signal acquisition and effective debugging and analysis. This method allows users to acquire more data samples than conventional methods. The proposed lab allows students to remotely test and debug their designs, bridging the gap between theory and practice in embedded system design.
Detecting and resolving feature envy through automated machine learning and m...IJECEIAES
Efficiently identifying and resolving code smells enhances software project quality. This paper presents a novel solution, utilizing automated machine learning (AutoML) techniques, to detect code smells and apply move method refactoring. By evaluating code metrics before and after refactoring, we assessed its impact on coupling, complexity, and cohesion. Key contributions of this research include a unique dataset for code smell classification and the development of models using AutoGluon for optimal performance. Furthermore, the study identifies the top 20 influential features in classifying feature envy, a well-known code smell, stemming from excessive reliance on external classes. We also explored how move method refactoring addresses feature envy, revealing reduced coupling and complexity, and improved cohesion, ultimately enhancing code quality. In summary, this research offers an empirical, data-driven approach, integrating AutoML and move method refactoring to optimize software project quality. Insights gained shed light on the benefits of refactoring on code quality and the significance of specific features in detecting feature envy. Future research can expand to explore additional refactoring techniques and a broader range of code metrics, advancing software engineering practices and standards.
Smart monitoring technique for solar cell systems using internet of things ba...IJECEIAES
Rapidly and remotely monitoring and receiving the solar cell systems status parameters, solar irradiance, temperature, and humidity, are critical issues in enhancement their efficiency. Hence, in the present article an improved smart prototype of internet of things (IoT) technique based on embedded system through NodeMCU ESP8266 (ESP-12E) was carried out experimentally. Three different regions at Egypt; Luxor, Cairo, and El-Beheira cities were chosen to study their solar irradiance profile, temperature, and humidity by the proposed IoT system. The monitoring data of solar irradiance, temperature, and humidity were live visualized directly by Ubidots through hypertext transfer protocol (HTTP) protocol. The measured solar power radiation in Luxor, Cairo, and El-Beheira ranged between 216-1000, 245-958, and 187-692 W/m 2 respectively during the solar day. The accuracy and rapidity of obtaining monitoring results using the proposed IoT system made it a strong candidate for application in monitoring solar cell systems. On the other hand, the obtained solar power radiation results of the three considered regions strongly candidate Luxor and Cairo as suitable places to build up a solar cells system station rather than El-Beheira.
An efficient security framework for intrusion detection and prevention in int...IJECEIAES
Over the past few years, the internet of things (IoT) has advanced to connect billions of smart devices to improve quality of life. However, anomalies or malicious intrusions pose several security loopholes, leading to performance degradation and threat to data security in IoT operations. Thereby, IoT security systems must keep an eye on and restrict unwanted events from occurring in the IoT network. Recently, various technical solutions based on machine learning (ML) models have been derived towards identifying and restricting unwanted events in IoT. However, most ML-based approaches are prone to miss-classification due to inappropriate feature selection. Additionally, most ML approaches applied to intrusion detection and prevention consider supervised learning, which requires a large amount of labeled data to be trained. Consequently, such complex datasets are impossible to source in a large network like IoT. To address this problem, this proposed study introduces an efficient learning mechanism to strengthen the IoT security aspects. The proposed algorithm incorporates supervised and unsupervised approaches to improve the learning models for intrusion detection and mitigation. Compared with the related works, the experimental outcome shows that the model performs well in a benchmark dataset. It accomplishes an improved detection accuracy of approximately 99.21%.
Developing a smart system for infant incubators using the internet of things ...IJECEIAES
This research is developing an incubator system that integrates the internet of things and artificial intelligence to improve care for premature babies. The system workflow starts with sensors that collect data from the incubator. Then, the data is sent in real-time to the internet of things (IoT) broker eclipse mosquito using the message queue telemetry transport (MQTT) protocol version 5.0. After that, the data is stored in a database for analysis using the long short-term memory network (LSTM) method and displayed in a web application using an application programming interface (API) service. Furthermore, the experimental results produce as many as 2,880 rows of data stored in the database. The correlation coefficient between the target attribute and other attributes ranges from 0.23 to 0.48. Next, several experiments were conducted to evaluate the model-predicted value on the test data. The best results are obtained using a two-layer LSTM configuration model, each with 60 neurons and a lookback setting 6. This model produces an R 2 value of 0.934, with a root mean square error (RMSE) value of 0.015 and a mean absolute error (MAE) of 0.008. In addition, the R 2 value was also evaluated for each attribute used as input, with a result of values between 0.590 and 0.845.
A review on internet of things-based stingless bee's honey production with im...IJECEIAES
Honey is produced exclusively by honeybees and stingless bees which both are well adapted to tropical and subtropical regions such as Malaysia. Stingless bees are known for producing small amounts of honey and are known for having a unique flavor profile. Problem identified that many stingless bees collapsed due to weather, temperature and environment. It is critical to understand the relationship between the production of stingless bee honey and environmental conditions to improve honey production. Thus, this paper presents a review on stingless bee's honey production and prediction modeling. About 54 previous research has been analyzed and compared in identifying the research gaps. A framework on modeling the prediction of stingless bee honey is derived. The result presents the comparison and analysis on the internet of things (IoT) monitoring systems, honey production estimation, convolution neural networks (CNNs), and automatic identification methods on bee species. It is identified based on image detection method the top best three efficiency presents CNN is at 98.67%, densely connected convolutional networks with YOLO v3 is 97.7%, and DenseNet201 convolutional networks 99.81%. This study is significant to assist the researcher in developing a model for predicting stingless honey produced by bee's output, which is important for a stable economy and food security.
A trust based secure access control using authentication mechanism for intero...IJECEIAES
The internet of things (IoT) is a revolutionary innovation in many aspects of our society including interactions, financial activity, and global security such as the military and battlefield internet. Due to the limited energy and processing capacity of network devices, security, energy consumption, compatibility, and device heterogeneity are the long-term IoT problems. As a result, energy and security are critical for data transmission across edge and IoT networks. Existing IoT interoperability techniques need more computation time, have unreliable authentication mechanisms that break easily, lose data easily, and have low confidentiality. In this paper, a key agreement protocol-based authentication mechanism for IoT devices is offered as a solution to this issue. This system makes use of information exchange, which must be secured to prevent access by unauthorized users. Using a compact contiki/cooja simulator, the performance and design of the suggested framework are validated. The simulation findings are evaluated based on detection of malicious nodes after 60 minutes of simulation. The suggested trust method, which is based on privacy access control, reduced packet loss ratio to 0.32%, consumed 0.39% power, and had the greatest average residual energy of 0.99 mJoules at 10 nodes.
Fuzzy linear programming with the intuitionistic polygonal fuzzy numbersIJECEIAES
In real world applications, data are subject to ambiguity due to several factors; fuzzy sets and fuzzy numbers propose a great tool to model such ambiguity. In case of hesitation, the complement of a membership value in fuzzy numbers can be different from the non-membership value, in which case we can model using intuitionistic fuzzy numbers as they provide flexibility by defining both a membership and a non-membership functions. In this article, we consider the intuitionistic fuzzy linear programming problem with intuitionistic polygonal fuzzy numbers, which is a generalization of the previous polygonal fuzzy numbers found in the literature. We present a modification of the simplex method that can be used to solve any general intuitionistic fuzzy linear programming problem after approximating the problem by an intuitionistic polygonal fuzzy number with n edges. This method is given in a simple tableau formulation, and then applied on numerical examples for clarity.
The performance of artificial intelligence in prostate magnetic resonance im...IJECEIAES
Prostate cancer is the predominant form of cancer observed in men worldwide. The application of magnetic resonance imaging (MRI) as a guidance tool for conducting biopsies has been established as a reliable and well-established approach in the diagnosis of prostate cancer. The diagnostic performance of MRI-guided prostate cancer diagnosis exhibits significant heterogeneity due to the intricate and multi-step nature of the diagnostic pathway. The development of artificial intelligence (AI) models, specifically through the utilization of machine learning techniques such as deep learning, is assuming an increasingly significant role in the field of radiology. In the realm of prostate MRI, a considerable body of literature has been dedicated to the development of various AI algorithms. These algorithms have been specifically designed for tasks such as prostate segmentation, lesion identification, and classification. The overarching objective of these endeavors is to enhance diagnostic performance and foster greater agreement among different observers within MRI scans for the prostate. This review article aims to provide a concise overview of the application of AI in the field of radiology, with a specific focus on its utilization in prostate MRI.
Seizure stage detection of epileptic seizure using convolutional neural networksIJECEIAES
According to the World Health Organization (WHO), seventy million individuals worldwide suffer from epilepsy, a neurological disorder. While electroencephalography (EEG) is crucial for diagnosing epilepsy and monitoring the brain activity of epilepsy patients, it requires a specialist to examine all EEG recordings to find epileptic behavior. This procedure needs an experienced doctor, and a precise epilepsy diagnosis is crucial for appropriate treatment. To identify epileptic seizures, this study employed a convolutional neural network (CNN) based on raw scalp EEG signals to discriminate between preictal, ictal, postictal, and interictal segments. The possibility of these characteristics is explored by examining how well timedomain signals work in the detection of epileptic signals using intracranial Freiburg Hospital (FH), scalp Children's Hospital Boston-Massachusetts Institute of Technology (CHB-MIT) databases, and Temple University Hospital (TUH) EEG. To test the viability of this approach, two types of experiments were carried out. Firstly, binary class classification (preictal, ictal, postictal each versus interictal) and four-class classification (interictal versus preictal versus ictal versus postictal). The average accuracy for stage detection using CHB-MIT database was 84.4%, while the Freiburg database's time-domain signals had an accuracy of 79.7% and the highest accuracy of 94.02% for classification in the TUH EEG database when comparing interictal stage to preictal stage.
Analysis of driving style using self-organizing maps to analyze driver behaviorIJECEIAES
Modern life is strongly associated with the use of cars, but the increase in acceleration speeds and their maneuverability leads to a dangerous driving style for some drivers. In these conditions, the development of a method that allows you to track the behavior of the driver is relevant. The article provides an overview of existing methods and models for assessing the functioning of motor vehicles and driver behavior. Based on this, a combined algorithm for recognizing driving style is proposed. To do this, a set of input data was formed, including 20 descriptive features: About the environment, the driver's behavior and the characteristics of the functioning of the car, collected using OBD II. The generated data set is sent to the Kohonen network, where clustering is performed according to driving style and degree of danger. Getting the driving characteristics into a particular cluster allows you to switch to the private indicators of an individual driver and considering individual driving characteristics. The application of the method allows you to identify potentially dangerous driving styles that can prevent accidents.
Hyperspectral object classification using hybrid spectral-spatial fusion and ...IJECEIAES
Because of its spectral-spatial and temporal resolution of greater areas, hyperspectral imaging (HSI) has found widespread application in the field of object classification. The HSI is typically used to accurately determine an object's physical characteristics as well as to locate related objects with appropriate spectral fingerprints. As a result, the HSI has been extensively applied to object identification in several fields, including surveillance, agricultural monitoring, environmental research, and precision agriculture. However, because of their enormous size, objects require a lot of time to classify; for this reason, both spectral and spatial feature fusion have been completed. The existing classification strategy leads to increased misclassification, and the feature fusion method is unable to preserve semantic object inherent features; This study addresses the research difficulties by introducing a hybrid spectral-spatial fusion (HSSF) technique to minimize feature size while maintaining object intrinsic qualities; Lastly, a soft-margins kernel is proposed for multi-layer deep support vector machine (MLDSVM) to reduce misclassification. The standard Indian pines dataset is used for the experiment, and the outcome demonstrates that the HSSF-MLDSVM model performs substantially better in terms of accuracy and Kappa coefficient.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
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Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
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Control of an Autonomous Hybrid Microgrid as Energy Source for a Small Rural Village
1. International Journal of Electrical and Computer Engineering (IJECE)
Vol. 7, No. 1, February 2017, pp. 86 – 99
ISSN: 2088-8708 86
Institute of Advanced Engineering and Science
w w w . i a e s j o u r n a l . c o m
Control of an Autonomous Hybrid Microgrid as Energy
Source for a Small Rural Village
Am´erico Joaquim Lampi˜ao*
, Tomonobu Senjyu*
, and Atsushi Yona*
*
Faculty of Engineering, Department of Electrical and Electronics Engineering
*
University of the Ryukyus, 1 Senbaru, Nishihara-cho, Nakagami, Okinawa, 903-0213, Japan
Article Info
Article history:
Received Oct 7, 2016
Revised Dec 11, 2016
Accepted Dec 24, 2016
Keyword:
Microgrid
Utility grid
Photovoltaic system
Battery energy system
Power balance
ABSTRACT
Nowadays, the exhaustion of electricity power in rural areas is becoming an important
issue for many African Nations. Moreover, challenges include the high cost of extend-
ing the power grid to these locations, the economic health of the utilities and lack of
revenue in impoverished villages. Numerous new initiatives are being implemented in
the countries some of them co-financed by international organizations. In this paper,
the hybrid microgrid is carried out as a feasible solution for a small rural village. A
model of hybrid microgrid consisting of combination of photovoltaic (PV) panels and
battery energy storage (BES) and a control system for managing the components of en-
tire system to feed the village as local load is proposed. The control system must avoid
the interruptions of power delivered to the consumers (village) and, therefore, good
quality and reliability of the system is required. The PI controllers are used to regu-
late the voltage and current using three-phase dq transformation, while the parameters
are determined using Ziegler-Nichols tuning method. The effectiveness of the pro-
posed method is verified by simulation results given by Matlab/SimPowerSystems R
environment.
Copyright c 2017 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Am´erico Joaquim Lampi˜ao
Department of Electrical and Electronic Engineering
University of the Ryukyus
1 Senbaru, Nishihara-cho, Okinawa, 903-0213, Japan
Tel: +81-98-895-8686, +258-84-438-3831
Email: americo.lampiao@gmail.com
1. INTRODUCTION
Over 620 million people in Africa still do not have access to the electricity [1]. As known, electricity
is an essential contributor to the well-being of people and a key point of economic betterment for any country in
the world. In 2001, the US National Academy of Engineers (NAE) voted ”electrification” as the most significant
engineering achievement of the past century. According the worldwide calculation of electric consumption at
present, approximately 1.4 billion people more than 20 percent population all over the world does not have
access to electric connection and mostly live in rural areas in Africa [2]. The biggest challenges surrounding
energy in this locations is the high cost to extend the power grid from main to these locations. New initiatives
are being implemented using renewable energy source, but improvements are still required [3]. In this paper, a
model of autonomous hybrid microgrid supplying a small rural village as local load and the respective controller
is proposed to demonstrate their feasibility solution in rural villages. The hybrid source is a combined PV
panels and Battery storage, connected to the load through voltage source inverter (VSI), filter and isolating
transformer. The loads are typically rural such as mills, water pumps for irrigation, and small houses with one
or two compartments. The households mainly use the firewood for cooking, therefore, small power for each
house is expected. The use of PV panels as renewable energy has advantages due the environmental regulation
protection, but the generated power changes according the temperature and solar radiation [4]-[6]. This fact
Journal Homepage: http://iaesjournal.com/online/index.php/IJECE
Institute of Advanced Engineering and Science
w w w . i a e s j o u r n a l . c o m
, DOI: 10.11591/ijece.v7i1.12900
2. IJECE ISSN: 2088-8708 87
generates stability, reliability and power quality problems at the consumers [7]-[11].
The battery is used to overcome the intermittent and uncertain of the photovoltaic (PV) generation
[13]. The PV system is composed by PV panels and DC/DC boost converter. In order to maximize the efficiency
of the PVs and maintain the voltage at the DC-link, a combination of MPPT (maximum power point tracking)
and DC/DC boost converter is used. The MPPT uses an algorithm to maintain the generated power at maximum
point [11-13].
Depending on the PV generation and load demand, the battery may operate at either charging or
discharging mode. In discharging mode, the battery works as power source and injects power to the inverter
and, therefore makes balance between generation and load power demand. In charge mode, the battery receives
the power from PV system. These achievements are possible by using a DC/DC bidirectional converter. The
VSI is used to interface the DC-side with AC-side and, therefore, to convert DC current to AC with appropriate
natural frequency. The inverter operates in high frequency (around 5-20 kHz), and causes harmonic distortions
in output current [17]-[21], therefore, in this study a filter harmonics will be taken into account. In this paper,
an isolating transformer rated at 100 kVA, to step-up the line voltage from 230 V to 380 V, is used. In addition,
power supply companies demand this for the elimination of possible zero sequence or DC components in the
generated voltages and for increased protection it affords [9]. This fact can be used as an advantage since the
transformer can form part of a filter impedance and may, therefore, reduce the undesired harmonic content of
the output current. Power quality standards for connection of an inverter to the load are still under development,
since previously there have been few similar high power electronic applications. In this study the important
aspect of power quality is harmonic distortion. General requirements for harmonic distortion can be found in
standards IEEE [1547.1-1547.8].
The control solution proposed, provides high quality of current delivered to the consumers and, there-
fore, high power quality. In addition, active and reactive power control is provided. The choice of control
variables are based on standards, regulations and procedures presented in scientific publications. PLL (phase
locked loop) and PI controllers was used to accomplish the power management of the system using dq syn-
chronous reference. The parameters was determined using Ziegler-Nichols tuning method. Over the years,
considerable research has been conducted on current and voltage regulation in microgrids, and various ap-
proaches have been proposed. In this paper a review of the latest journal and conference papers related to
the control in microgrids are carried out to demonstrate the validity of the proposed method, performed using
MATLAB/ SimPowerSystems R
. Simulation results demonstrate the effectiveness of proposed controller and,
therefore, can be used to analyse microgrids connections.
The rest of the section in this paper is organized as follows: In Section II, the proposed model is
presented and the main components including control methodology are described. In Section III the discussion
of the simulation results to show the effectiveness of the proposed system is presented. Finally, conclusions are
drawn in Section IV.
2. RESEARCH METHOD
The methodology adopted in this study, is proposing the schematic configuration of the model to
be implemented and simulated using Matlab/Simulink environment. The components are described and the
simulation results are presented. The conclusion is based on the presented results. Figure 1, shows the proposed
model, and the description are presented below.
2.1. PV System
The PV array used in this paper acts as an input source for charging the battery as well as supplying to
the AC load during normal conditions. The basic equation of a PV panel is presented in [12]. Table 2, shows the
constant values for the standard state of each PV panel as used in the present study. As mentioned in preview
chapters, the PV generates intermittent power due the variation of sun’s radiation and cell temperature. In order
to maximize the power and maintain the voltage in DC-link at required level (400 V), a combined MPPT and
DC/DC boost converter are used. The MPPT aims at using an algorithm to ensure the array to operate at the
maximum power point [6]. There are many different MPPT methods. Perturbation and Observation (P&O)
method is used most widely since it is much simpler and needs fewer measured variables as input. In this study
P&O was used and performed according [4].
Control of an Autonomous Hybrid Microgrid as Energy Source for a Small ... (Am´erico J. Lampi˜ao)
3. 88 ISSN: 2088-8708
B1
B1
B1
B1
B1
B1
R1 L1
PV_array
BESS
CBm
DC
MPPT
Boost converter 3-Phase VSI
RD
Cf
Clink
230 / 380V
DC
Rural Village
Ch = Chopper circuit
DC
AC
DC
DC
Bidirection DC/DC converter
Ch
House1 House3
House2 House4
House5
House6
50Hz, 380V, ±100kVA
Scan:
Voltage
Current
Fig. 1. Proposed system topology.
2.2. Battery Energy Storage System (BESS)
The battery is required to improve the system performance of microgrid and make the balance between
the generated power and load power demand through charge/discharge energy to or from this storage [8]. In
this paper, the battery model is Lithium-Ion taken from the MATLAB/Simulink tools with a nominal voltage
of 310 V. The initial state of charge (SOC) of the model can be set according to the need of the simulation.
The simulation parameters are shown in Table 1. The battery is connected at the DC-link through a DC/DC
bidirectional converter. The objective of this converter is to maintain the voltage on DC-link (400 V) and to
operate the system in order to charge/discharge the battery according the different situations. In charge mode the
PV generates more than required power and, therefore, the extra power must stored in the battery. In discharge
mode, the PV generates less than required power, then the battery injects power to balance the generated
power with load power demand. Figure 2, shows the schematic configuration of bidirectional converter and the
parameters are achieved according [11], and [15].
Table 1. Parameters of the Battery model.
Parameter Value
Nominal Voltage [V] 310
Rated Capacity [Ah] 8.2
Fully Charged Voltage [V] 360.836
Nominal current [A] 7.4157
Initial State-of-Charge [%] 80
2.3. DC-bus dynamics and protection
A chopper circuit is used in DC-link to dissipate excess power during fault condition or over voltage. If
the DC-link voltage exceeds the maximum limit (425 V), the DC-link will be short-circuited through the resistor
rc and the excess of power will be dissipated in this resistor, then the DC-link voltage will be maintained. A
common capacitor Clink is installed in parallel with chopper circuit as shown in Figure 2. In this study, the
value of rc is 300 Ω.
2.4. Inverter characteristics
The role of power electronics converter is very important in renewable energy systems [11]. In this
study, the inverter is set-up in accordance with the circuit shown in Figure 2. An IGBT six pack is modelled and
controlled in order to achieve the required objectives. The space-vector (SV) power width modulation (PWM)
technique is used to produce the switching control signals to be applied at three-phase inverter.
IJECE Vol. 7, No. 1, February 2017: 86 – 99
4. IJECE ISSN: 2088-8708 89
D1
Qp
Clink
Ip=Ipv
PV_array
PWM
MPPT
IpvVpv
Vdc*
Vpv
Lp
Boost controller
Ih
Ic
Ie
Lb
Ib
Ib
PWM
Vdc*
Battery controller
B1
B1
B1
B1
B1
B1
Vdc Ib
Ib*
AND
Qb2
Qb1
b1 b2
BESS
Q6Q2
Q1 Q5
Q4
Q3
a
b
c
PI1
Ird
Qc
rc
R1 L1 R2 L2
Cf
RD
LCL Filter
Winding Tr.
Chopper
Vdc
PI2
Vdc
PI3
Icf
ON/OFF
O
O
O
O
n
Vcf
<
AND
NOT
SOC
85%
CB
p
I1 I2
Load
(Village)
Fig. 2. Detailed system configuration.
2.5. Harmonics filter and isolating transformer
In this study, a LC filter combined with equivalent impedance of isolating transformer is used to reduce
the harmonics distortions in output inverter. The final configuration is a LCL filter which the components are
determined based on [17]. The primary objective of isolating transformer is to step-up the line voltage from
230 V to 380 V (nominal load voltage). The parameters are presented in Table 3.
2.6. Load characteristics
The main use of electricity is expected to be for lights, mills, bars, water pump for irrigation, and
office in village center. The load varies according the season and time. For example, during the rain season
the use of water pumps are not required for irrigation, and therefore the load power is small. In this study, the
estimated maximum load power is assumed 100 kVA and the line voltage and natural frequency is 380 V and
50 Hz, respectively.
Table 2. PV panel constants.
Parameters Value Parameters Value
Short-circuit current Isc 8.36 A Number of cells per module Ncells 54
Open circuit voltage Voc 33.20 V Number of panels in series Ns 14
Voltage at maximum power point Vmpp 26.3 V Number of panels in parallel Np 80
Current at maximum power point Impp 7.61 A Diode quality factor A 1.5
Temperature coefficient of Isc 0.00502 Series resistance Rs 0.16 Ω
Elementary charge q 1.6×10−19
C Parallel resistance Rp 1010.60 Ω
Boltzmanns constant B 1.38×10−23
Energy gap Eg 1.2 V
3. CONTROL OF THE SYSTEM
The overall control structure consists of a DC-link voltage controller and a line current controller. To
supply a line current with low distortion, the connection to the grid is made by an AC filter [17] which consists
of combination of LC and equivalent impedance of isolating transformer used to boost the line voltage from
Control of an Autonomous Hybrid Microgrid as Energy Source for a Small ... (Am´erico J. Lampi˜ao)
5. 90 ISSN: 2088-8708
230 V to 380 V. The final configuration is LCL filter, as shown in Figure 2. The control is made in dq reference
and PLL is used to regulate the system frequency. In order to achieve good performance of control parameters,
the poles and zeros of transfer function was verified.
3.1. Control of Boost and Bidirectional DC/DC converters
The linearisation of boost and bidirectional DC/DC converters are analysed and presented in [8] and
[15]. From this analysis, the voltage and current transfer functions are given by:
G(v) =
Vout
d
=
− L
(1−D)2 Vins + RVin
RLCs2 + Ls + R(1 − D)2
(1)
G(i) =
Iin
d
=
Vin
(1−D) (2 + RCs)
RLCs2 + Ls + R(1 − D)2
(2)
where Vout is reference output voltage (400 V), Vin is input voltage, Iin is the inductor current, L is inductor, C
is common capacitor in DC-link, D is the duty cycle and R is the equivalent load resistor. The details about this
task is presented in [11]. In this paper, the equation (1) and (2) was used to design the DC/DC boost controller
and DC/DC bidirectional converter. As mentioned in above chapters, Ziegler-Nichols tuning method was used
to achieve the control parameters. Figures 4(b) and -(d), show the tuning block diagrams of voltage and current.
The inductances of boost and bidirectional converters used in this study are 3 mH and 1 mH, respectively.
3.2. DC-link voltage regulator
The purpose of the DC-link voltage controller is to preserve the DC-link voltage at its reference
value (V dc∗
) and to provide the reference power (Pe). To design the DC-link voltage regulator, the following
assumptions are considered.
• The grid voltage amplitude is constant;
• Using rotary axes dq, the grid voltage V g coincides with d-axis;
• The unity power factor is required, then the displacement between the grid voltage and current is zero.
Their q-axis components are also zeros.
For an accurate control model, it was made a linearisation in DC-side. Figure 2, shows the schematic config-
uration. In normal condition the gate of IGBT (Qc) receives the signal zero, meaning that the chopper circuit
is opened and no current is flowing through dump-resistor. Neglecting the chopper circuit, the DC side of the
inverter can be described as follows:
ih = ie + ic
ie = γaia + γbib + γcic
ic = Clink
vdc
dt
Ph = ihvdc
(3)
where ic is current through the DC-link capacitor, Ph is available hybrid active power at specific solar radiation
and SOC, Clink is DC-link capacitor, ih is the hybrid current, Vdc is voltage in DC-link, ie is the current
delivered to the inverter (which is a function of the line currents ia, ib, ic, and the states of the power-poles
γa, γb, γc (1: ’on’, 0:’off’, γi + upper pole,γi − lower pole in the 3-phase VSI).
To achieve steady state operation the supplied DC power of the Ph and the AC power for load must
be balanced. The DC voltage controller gives the set point of the AC power. Assuming, in this paper, that there
is no power losses in the inverter, if only active power is to be injected into the grid (load):
Pe ≈ Pg = 3 · Vg · Ig = 3
2 · Vgd · Igd
Qe ≈ 0
(4)
The generated hybrid power and the link capacitor power are expressed by equations (3) and (4), respectively:
Phybrid = Ih · Vdc (5)
IJECE Vol. 7, No. 1, February 2017: 86 – 99
6. IJECE ISSN: 2088-8708 91
vid
ωL
id,ref
PI4
Id,max
Id,min
Vdc*
ωL
Viq,max
Viq,min vq
iq,ref
Isq,max
Isq,min
Q,ref
vd
∆id
∆iq
id
iq
Vdc
Q
viq∆Q
∆v
SVPWM
dq
abc
abc
dq
abc
dq
vd
vq
id
iq
Dump load
Controller
Vdc(max)
Vid,max
Vid,min
VdcVdc
rd
IGBT
Clink
PLL
ie
φ
Pcc
PI6
PI7PI5
~380V
50Hz
Fig. 3. Control scheme of the grid-side inverter.
Pcapacitor = Clink · Vdc ·
dVdc
dt
(6)
The VSI losses are neglected, then the following relationship is verified:
Pgrid = Phybrid · Pcapacitor (7)
Following equations (3) to (7), the relation between DC-link voltage and the grid current expressed in rotary
axis is obtained:
Vdc =
1
Clink · s
(Ih −
3
2
Vgd
Vdc
· Igd) (8)
where Vg or Vs is the reference phase voltage in output inverter (132.8 V). The DC-link voltage is regulated
imposing a reference in the active current component (Igd). A voltage variation in the DC-link is compensated
by changing the AC line active currents, in such a way that the DC-link is kept at the established value (400 V).
The PIs are used as regulators and their parameters are achieved by using Ziegler-Nichols tuning method. The
DC-link voltage control loop is presented in Figure 4(b).
3.3. VSI and Grid current controller
The output current controller consists of a model based on LCL filter configuration, as shown in Figure
2. According Kirchhoff’s rules, we obtain the equations:
−→vi −
−→
i1 R1 − L1
d
−→
i1
dt
−
−→
ic Rd − −→vcf = 0 (9)
−→vs +
−→
i2 R2 + L2
d
−→
i2
dt
−
−→
ic Rd − −→vcf = 0 (10)
−→
ic =
−→
i1 −
−→
i2 (11)
The equivalent equations of (9), (10) and (11) can be described as:
d
dt
−→
i1 = −
(Rd + R1)
(L1)
−→
i1 +
Rd
L1
−→
i2 +
1
L1
−→vcf +
1
L1
−→vi (12)
d
dt
−→
i2 = −
(Rd + R2)
(L2)
−→
i2 +
Rd
L2
−→
i1 +
1
L2
−→vcf −
1
L2
−→vs (13)
Control of an Autonomous Hybrid Microgrid as Energy Source for a Small ... (Am´erico J. Lampi˜ao)
7. 92 ISSN: 2088-8708
d
dt
−→vcf =
1
Cf
(
−→
i1 −
−→
i2 ) (14)
where,
−→
i1 = [i1a
i1b
i1c
]t
is the output current at filter,
−→
i2 = [i2a
i2b
i2c
]t
is the current injected to the grid;
−→vcf = [vcfa vcfb
vcfc ]t
is the voltage in capacitor Cf .
The control system is made by using voltage and current measurements. In order to reduce the number
of measurement sensors, and therefore, minimizing the cost of project, we consider only two sensors to detect
voltage and current. The basic control principles used in this paper are generally based on the decoupled current
control presented in [17], and [18]. The three-phase voltage on load bus is measured and transformed into a dq
reference frame (vd and vq). The three-phase current flowing between the loads and the inverter is measured
and transformed to id and iq. With the comparisons of the dq components to their respective references, the
resulting errors are sent to the PI controllers to generate the required output voltage of the inverter.
In order to facilitate the equation analysis, many researches make approximations such that the output
current inverter is assumed equal with the output current at the filter (i1≈i2), because the current ic is very small
[20]-[21]. Considering this approximations, the filter is analysed as RL and the parameters are the summation
of filter impedance and equivalent internal impedance of the transformer (Rt = R1 + R2, and Lt = L1 + L2).
In this paper, this assumptions are used to achieve the decoupled equations:
d
dt
−−→
i1dq
=
−Rt
Lt
ω
−ω −Rt
Lt
−−→
i1dq
−
1
L1
−−→vsdq
+
1
L1
−−→vidq
(15)
where, ω is the system frequency in rad/s. From (15) is obtained:
Vid
= (Rt + Lts)I1d
+ Vsd
− ωLtI1q (16)
Viq
= (Rt + Lts)I1q
+ Vsq
+ ωLtI1d
(17)
In equation (16) and (17), considering:
V ”
d = (Rt + Lts)I1d
(18)
V ”
q = (Rt + Lts)I1q
(19)
The equivalent equation become:
Vid
= V ”
d + Vsd
− ωLtI1q (20)
Viq = V ”
q + Vsq + ωLtI1q (21)
The plant is a first order system with transfer function
G(s) =
I1dq
(s)
Vidq
(s)
=
1
Rt + sLt
(22)
The PI transfer function without derivative action is given by:
Ts = Kp +
Ki
s
= Kp(1 +
1
Tis
) (23)
Where Ti =
Kp
Ki
is integral time constant or reset time, Kp and Ki is proportional and integral gains, respec-
tively. The goal of tuning method is to find the proper gains in order to achieve the required reference values.
The block diagrams of control loops are shown in Figure 4(a) and -(c).
4. RESULT AND ANALYSIS
In order to demonstrate the effectiveness of the proposed control strategy, a combined PV and BESS
(hybrid) connected to the load through three-phase VSI was set up and simulated under three different scenarios
using sampling time 20 µs and time domain from 0 to 0.55 s. The temperature is assumed constant 25 o
C and
sudden changes of solar radiation was implemented as input of PV panels. The initial SOC is 80 % in all
scenarios.
a) Case Study 1: This scenario aims to confirm the functionalities of PV and BESS under solar
variations to supply the load rated with power 100 kW. The simulation is carried out in sequence as follows:
IJECE Vol. 7, No. 1, February 2017: 86 – 99
8. IJECE ISSN: 2088-8708 93
System transfer function
1
idref /
iqref
1
1/Rt
Lt
RtsKp
1+Ti S
Ti
id /
iq
PI-Controller
Vd’ /Vq’ Vd /Vq
Vdcref
1
1
Clink.SKp
1+Ti S
Ti
PI-Controller
System transfer function
Vdcref
1
Gv(s)
Equation (7)
Kp
1+Ti S
Ti
Vdc
PI-Controller PWM + converter
System transfer function
ILref
1
Gi(s)
Equation (8)
Kp
1+Ti S
Ti
IL
PI-Controller PWM + converter
2
3Vgd
Vdc
IhPWM
(a) (b)
(c) (d)
PWM + converter
Fig. 4. Block diagrams of control loops.
Table 3. Grid parameters and control gains
Parameters Value Parameters Value
Filter inductance L1 265 µH Switching frequency fs 20 kHz
Filter resistance R1 40 mΩ Natural frequency f 50 Hz
Filter resistance Rd 100 mΩ Frequency modulation PWM 10 kHz
Filter capacitor Cf 300 µC PI4 = PI5 [Kp, Ki] [2.1, 253]
Transformer inductance L2 185 µH PI6 = PI7 [Kp, Ki] [0.004, 0.21]
Transformer resistance R2 25 mΩ PI1 [Kp, Ki] [0.0006, 0.13]
Dc-link capacitor Clink 470 µC PI2 [Kp, Ki] [0.0002, 0.18]
Peak load power Pload 100 kW PI3 [Kp, Ki] [0.0004, 0.21]
At t=0.0 s, the simulation starts when the solar radiation is maximum (1 kW/m2
), therefore, the PV panels are
generating more than required load power. In this case, the excess power is stored in battery. The maximum
power injected to the inverter is 115.15 kW, means that 100.0 kW is for load and 15.15 kW is total loss in
inverter, filter, transformer and lines. In that period the battery is receiving power and therefore, the SOC rises
gradually (charging mode). At t=0.2 s, the solar radiation drops suddenly until 0.5 kW/m2
and the PV panels
start to generate less than required power. In that moment, the battery detects the problem and starts to inject
the power to the inverter in order to balance the generation with the load demand. Therefore, the battery starts
to discharge and the SOC decreases gradually. At t=0.4 s, the solar radiation suddenly rises until (1 kW/m2
)
and the PV panels starts again to generate more than required power, then the battery changes from discharge
to charge mode. During this process, the DC-link voltage, power injected in inverter, voltage, and load current
are maintained at 400 V, 115.15 kW, 380 V and 300 A, respectively as the graphics shown in Figure 5.
b) Case Study 2: This scenario aims to confirm the functionalities of PV and BESS under load
variation and solar radiation at 0.5 kW/m2
. The simulation is carried out in sequence as follows: At t=0.0 s, the
simulation starts when the load is 70.0 kW solar radiation at 0.5 kW/m2
, therefore, the PV panels are generating
more than required load power. In this case, the excess power is stored in battery. The system is injecting in
inverter 80.0 kW, meaning that an amount of power is to compensate the losses. In that period the battery is
receiving power and therefore, the SOC is increasing gradually. At t=0.2 s, the load increases until 100 kW,
then in that time the load power becomes more than generated power. In order to compensate the generation,
the battery starts to inject the power to make balance. While the battery is injecting power, the battery is being
discharged and therefore, the SOC is gradually decreasing. At t=0.4 s, the load power suddenly drops then the
battery changes from discharge to charge mode in order to store the excess generated power. Figure 6(a), shows
the behaviour of solar radiation, -(b) shows the voltage on DC-link, -(c) shows the battery current, -(d) shows
the SOC, -(e) shows the active power injected in inverter, -(e) and -(f) show the voltage and current in load bus.
c) Case Study 3: This scenario aims to confirm the functionalities of PV and BESS under faults, load
and solar variations. The simulation is carried out in sequence as follows: At t=0.0 s, the simulation starts when
the all load is connected 100.0 kW and the solar radiation is maximum. The PV panels are generating more
than required power. Therefore the excess power is stored in battery. At t=0.1 s, an instantaneous fault occur
on load bus and transients are observed. When the fault is removed, the system becomes stable. At t=0.15 s,
some loads are disconnected from the grid and, therefore, the power injected in inverter reduces until 70 kW. At
t=0.2 s, a similar fault occur in load bus and the transients are observed again. When the fault is removed the
system becomes stable. At t=0.25 s, all load is connected (100 kW) and therefore the injected power increases
Control of an Autonomous Hybrid Microgrid as Energy Source for a Small ... (Am´erico J. Lampi˜ao)
9. 94 ISSN: 2088-8708
too. At t=0.28 s, the solar radiation drops until 0.5 kW/m2
and the battery starts to inject power to compensate
the generated power according the load demand. At t=0.38 s and 0.48 s, instantaneous faults occur on load
bus and transients are verified. When the voltage on DC-link exceeds 425 V, the chopper circuit detects and an
amount of power is suppressed by dump-load resistor in order to rapidly balance the voltage. Figure 7, shows
the graphics under study. This results demonstrate that the system is controllable and the voltage and current
delivered to the consumers have good quality. Figure 7(f), shows the total harmonic distortion (THD=3.94 %).
5. CONCLUSION
This paper has proposed a model of autonomous hybrid microgrid powering through inverter a small
rural village and the design of respective controller to regulate the instantaneous output voltage. The graphs
obtained during the simulations, explain in detail the system’s versatility in different operating condition. The
system proves how a renewable source of energy such as PV panels can work together with battery in microgrid
to power local loads. Battery storage improves the reliability of the system by overcoming the PV generation
in order to balance with the load demand. The battery storage acts as DC load during charge mode, and as DC
source during discharge mode. The system was accurately modelled using Matlab/simulink and the parameters
have been chosen according the standards and methodologies presented in literatures. The simulation results
demonstrate the effectiveness of the proposed model and respective control methodology.
ACKNOWLEDGEMENT
The authors are really expressing their gratitude to the Senjyu’s Lab. members at the Department of
Electrical and Electronic Engineering, for their contributions.
REFERENCES
[1] UN Documents Gathering a body of global agreements, Chapter 7 of the charter of the United Nations
Signed in San Francisco, California on June, 1945. http://www.un-documents.net/k-002988.htm.
[2] A. H. Khan, et al., ”A Noble Design of a DC Micro Grid for Rural Area in Bangladesh, ” International
Journal of Technology Enhancements and Emerging Engineering Research, vol. 3, pp. 19-26, 2015.
[3] C. Marnay, et al., ”Optimal Technology Selection and Operation of Commercial-Building Microgrids, ”
IEEE Transactions on Power Systems, vol. 23, no. 3, pp. 975-982, August 2008.
[4] M. G. Villalva, et al., ”Comprehensive Approach to Modeling and Simulation of Photovoltaic Arrays, ”
IEEE Transactions on Power Electronics, vol. 24, no. 5, pp. 1198-1208, May 2009.
[5] S. Rahman and H. A. Rahman, ”Use of Photovoltaics in Microgrid as Energy Source and Control Method
using MATLAB/Simulink,” International Journal of Electrical and Computer Engineering (IJECE), vol. 6,
no. 2, pp. 851-858, April 2016.
[6] G. Sekar and T. Anita, ”Design and implementation of solar PV for power quality enhancement in Three-
phase four-wire distribution system, ” Journal of Electrical Engineering and Technology (JEET), pp. 75-82,
2015. http://dx.doi.org/10.5370/JEET.2015.10.1.075.
[7] Z. Miao, et al., ”An SOC based battery management system for microgrids, ” IEEE Transactions on Smart
Grid, vol. 5, no. 2, pp. 966-973, 2014.
[8] M. Miyagi, et al., ”Uninterruptible smart house equipped with the phase synchronization control system, ”
International Journal of Electrical Power and Energy Systems, Elsevier, vol. 63, pp. 302-310, 2014.
[9] R. Majumder, et al., ”Control and protection of a microgrid connected to utility through back-to-back
converters, ” Electric Power Systems Research, Elsevier, vol. 81, pp. 1424-1435, 2011.
[10] M. Prodanovic, and T. C. Green, ”Control and filter design of three-phase inverters for high power quality
grid connection, ” IEEE Transactions on Power Electronics, vol. 18, no. 1, pp. 373-2003, January 2003.
[11] R. Erickson, and D. Maksmovic, ”Fundamentals of power electronics, ” Kluwer Academic Publishers,
vol. 2, pp. 5-350, 2000.
[12] H. Bellia, et al., ”A detailed modeling of photovoltaic module using Matlab,” NRIAG Journal of Astron-
omy and Geophysics, vol. 3, pp. 53-61, May 2014.
[13] H. Matayoshi, et al., ”Uninterrupted smart house equipped with a single-phase dq-transformation system,
” Journal of Renewable and Sustainable Energy, vol. 8, 025101 (106) doi:10.1063/1.4942781.
IJECE Vol. 7, No. 1, February 2017: 86 – 99
10. IJECE ISSN: 2088-8708 95
[14] A. Panda, et al., ”A single phase photovoltaic inverter control for grid connected system,” Sadhana, Indian
Academy of Sciences, vol. 41, no. 1, pp. 15-30, January 2010.
[15] M. Gowda, et al., ”Moddeling of Buck DC-DC converter using Simulink,” International Journal of Inno-
vative Research in Science, Engineering and Technology, vol. 3, pp. 14965-14975, July 2014.
[16] N. Wang, at al., ”Battery energy storage system information modeling based on IEC 61850,” Journal of
Power and Energy Engineering, vol. 2, pp. 233-238, April 2014.
[17] M. Liserre, et al., ”Design and Control of an LCL-Filter-Based Three-Phase Active Rectifier, ” IEEE
Transactions on Industry Applications, vol. 41, no. 5, pp. 1281-1291, 2005.
[18] T. Raju, and P. R. Reddy, ”A Novel Control Algorithm for an Adaptive Hysteresis Band Current Con-
trolled Shunt Active Power Filter, ” International Refereed Journal of Engineering and Science (IRJES),
pp. 10-16, 2014.
[19] S. Bhat, et al., ”Effect of Parasitic Elements on the Performance of Buck-Boost Converter for PV Sys-
tems,” International Journal of Electrical and Computer Engineering (IJECE), vol. 4, no. 6, pp. 831-836,
December 2014.
[20] X. Bao, et al., ”Feedback Linearization Control of Photovoltaic inverter with LCL Filter, ” 2012 IEEE 7th
International Power Electronics and Motion Control Conference - ECCE Asia, pp. 2197-2201, June 2012.
[21] M. G. M. Abdolrasol, and S. Mekhilef, ”Three phase grid connected anti-islanding controller based
on distributed generation interconnection, ” 2010 IEEE International Conference on Power and Energy
(PECon2010), pp. 717-722, 2010.
BIOGRAPHIES OF AUTHORS
Am´erico Joaquim Lampi˜ao received his B.S. degree in electrical engineering from Universidade
Eduardo Mondlane at Mozambique in 2009. Currently, he is pursuing Master degree in electrical
engineering at Graduate School of Engineering and Science at University of the Ryukyus, Japan.
Besides, he is a junior Engineer at the Electricidade de Moc¸ambique (EDM), the national electricity
utility in Mozambique. His researches interests include power electronics, smart grid, microgrids,
voltage stability, power protection and electricity markets. He is affiliated with Order of Engineers
of Mozambique, and with IEEE as student member.
Tomonobu Senjyu received the B.S. and M.S. degrees in electrical engineering from University of
the Ryukyus Japan and the Ph.D. degree in electrical engineering from Nagoya University, Japan.
Since 1988, he has been with the Department of Electrical and Electronic Engineering, Faculty of
Engineering, University of the Ryukyus, where he is currently working as a Professor. His current
research interests include stability of ac machines, advanced control of electrical machines, power
electronics, renewable energy and smart grid.
Atsushi Yona received the B.S., M.S. and the Ph.D. degree from the University of the Ryukyus,
Okinawa, Japan, in 2006, 2008 and 2010, respectively, all in electrical engineering. In 2008, he
joined the University of the Ryukyus, where he is now a Assistant Professor at the Department of
Electrical and Electronic Engineering. His research interests include the renewable energy, fore-
casting techniques and optimal planning. Dr. Yona is a member of the Institution of Electrical
Engineers of Japan.
Control of an Autonomous Hybrid Microgrid as Energy Source for a Small ... (Am´erico J. Lampi˜ao)
11. 96 ISSN: 2088-8708
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
0.5
1
Time [s]
Solarradiation[kW/m2
]
(a) Solar radiation.
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
200
400
Time [s]
Voltage[V]
Vdcref Vdc
(b) Voltage on Dc-link (V dc − link).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-100
-50
0
50
100
Time [s]
Current[A]
(c) Battery current (ib).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
79.98
80
80.02
80.04
Time [s]
SOC[%]
(d) State-of-Charge (SOC).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
0
50
100
Time [s]
Activepower[kW]
(e) Active power injected into inverter (Pe).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-380
0
380
Time [s]
Voltage[V]
(f) Three-phase load voltage (V abc).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-300
-150
0
150
300
Time [s]
Current[A]
(g) Load current (Iabc).
Fig. 5. Simulation results (Scenario - 1)
IJECE Vol. 7, No. 1, February 2017: 86 – 99
12. IJECE ISSN: 2088-8708 97
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
0.5
1
Time [s]
Solarradiation[kW/m2
]
(a) Solar radiation.
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
200
400
Time [s]
Voltage[V]
Vdcref Vdc
(b) Voltage on Dc-link (V dc − link).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-100
-50
0
50
100
Time [s]
Batterycurrent[A]
(c) Battery current (ib).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
79.98
80
80.02
80.04
Time [s]
SOC[%]
(d) State-of-Charge (SOC).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
50
100
Time [s]
Activepower[kW]
(e) Active power injected into inverter (Pe).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-380
0
380
Time [s]
Voltage[V]
(f) Three-phase load voltage (V abc).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-300
-150
0
150
300
Time [s]
Current[A]
(g) Load current (Iabc).
Fig. 6. Simulation results (Scenario - 2)
Control of an Autonomous Hybrid Microgrid as Energy Source for a Small ... (Am´erico J. Lampi˜ao)
13. 98 ISSN: 2088-8708
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
0.5
1
Time [s]
Solarradiation[kW/m2
]
(a) Solar radiation.
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
200
400
600
Time [s]
Voltage[V]
Vdcref
Vdc
(b) Voltage on Dc-link (V dc − link).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-100
0
100
200
300
Time [s]
Batterycurrent[A]
(c) Battery current (ib).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
79.98
80
80.02
80.04
80.06
Time [s]
SOC[%]
(d) State-of-Charge (SOC).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
50
100
150
Time [s]
Activepower[kW]
(e) Active power injected into inverter (Pe).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-380
0
380
Time [s]
Voltage[V]
(f) Three-phase load voltage (V abc).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-800
-600
-400
-200
0
200
400
600
Time [s]
Current[A]
(g) Load current (Iabc).
IJECE Vol. 7, No. 1, February 2017: 86 – 99
14. IJECE ISSN: 2088-8708 99
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
0
0.5
1
1.5
Time [s]
Dump-loadcurrent[A]
(a) Overvoltage detection on Dc-link.
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
0
0.5
1
1.5
Time [s]
Dump-loadcurrent[A]
(b) Dump-load current (irc).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
0
0.5
1
Time [s]
Vd,Vq[pu]
(c) Load voltage in dq reference (V dq).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
-2
-1
0
1
2
Time [s]
Id,Iq[pu]
(d) Load current in dq reference (Idq).
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
0
50
Time [s]
Frequency[Hz]
(e) Grid frequency f.
0 2 4 6 8 10 12 14 16 18 20
0
0.5
1
1.5
Harmonic order
Mag(%ofFundamental)
Fundamental (50Hz) = 377.2 , THD= 3.94%
(f) Total Harmonic Distortion (THD).
Fig. 7. Simulation results (Scenario - 3)
Control of an Autonomous Hybrid Microgrid as Energy Source for a Small ... (Am´erico J. Lampi˜ao)