This paper presents the study of integrated hybrid renewable energy system. The wind and solar are used as input sources for the hybrid system. The proposed system involves the design of photovoltaic (PV) and wind energy conversion system (WECS).The system is designed for constant wind speed and varying solar irradiation and insolation. Maximum power point tracking (MPPT) algorithm is used to extract the maximum power from PV array. The integration of two input sources is done by single-ended primary-inductor converter. Fuzzy logic controller is used to control the duty cycle of one of the converter switch thereby extracting the maximum power from solar array. The system consists of photovoltaic (PV) array, wind energy conversion system (WECS), single-ended primary-inductor converter, voltage source inverter (VSI), LC filter and three phase load.
MODELING OF HYBRID WIND AND PHOTOVOLTAIC ENERGY SYSTEM USING A NEW CONVERTER ...elelijjournal
Renewable energy technologies offers clean, abundant energy gathered from self-renewing resources such as the sun, wind etc. As the power demand increases, power failure also increases. So, renewable energy sources can be used to provide constant loads. A new converter topology for hybrid wind/photovoltaic energy system is proposed. Hybridizing solar and wind power sources provide a realistic form of power generation.
The power generation using solar photovoltaic (PV) system in microgrid requires energy storage system due to their dilute and intermittent nature. The system requires efficient control techniques to ensure the reliable operation of the microgrid. This work presents dynamic power management using a decentralized approach. The control techniques in microgrid including droop controllers in cascade with proportional-integral (PI) controllers for voltage stability and power balance have few limitations. PI controllers alone will not ensure microgrid’s stability. Their parameters cannot be optimized for varying demand and have a slow transient response which increases the settling time. The droop controllers have lower efficiency. The load power variation and steady-state voltage error make the droop control ineffective. This paper presents a control scheme for dynamic power management by incorporating the combined PI and hysteresis controller (CPIHC) technique. The system becomes robust, performs well under varying demand conditions, and shows a faster dynamic response. The proposed DC microgrid has solar PV as an energy source, a lead-acid battery as the energy storage system, constant and dynamic loads. The simulation results show the proposed CPIHC technique efficiently manages the dynamic power, regulates DC link voltage and battery’s state of charge (SoC) compared to conventional combined PI and droop controller (CPIDC).
Grid-Connection Control and Simulation of PMSG Wind Power System Based on Mul...ijsrd.com
This dissertation proposes a wind energy conversion system is composed of a wind turbine PMSG, a rectifier, and an inverter. The wind turbine PMSG transforms the mechanical power from the wind into the electrical power, while the rectifier converts the AC power into DC power and controls the speed of the PMSG. The controllable inverter helps in converting the DC power to variable frequency and magnitude AC power. With the voltage oriented control, the inverter also possesses the ability to control the active and reactive powers injected into the grid. Multilevel inerter is used to step up the voltage and to reduce the THD. Here nine level and eleven level inverter are used and the voltage increases and THD reduces from 12.87 % to 7.46 %. Active and reactive power is controlled dc stabilization and the reactive power is near to unity Here PI controller is used to control the inverter output rms voltage and LC filter is used to remove the harmonics available in the system.
This paper presents the design and the implementation of a new microcontroller-based solar
Power inverter. The aim of this paper is to design single phase inverter which can convert DC voltage
to AC voltage at high efficiency and low cost. Solar and wind powered electricity generation are
being favored nowadays as the world increasingly focuses on environmental concerns. Power
inverters, which convert solar-cell DC into domestic-use AC, are one of the key technologies for
delivering efficient AC power The hardware and software design are oriented towards a single-chip
microcontroller-based system, hence minimizing the size and cost. With this new approach the
modularization of the conversion from solar power to electric power at its maximum power point can
be made more compact and more reliable.
Modelling of fuzzy logic controller for variable step mppt in photovoltaic sy...eSAT Journals
Abstract
The output power of photovoltaic electrical systems is highly dynamic and non-linear in nature. In order to extract maximum power
from such systems, maximum power point tracking (MPPT) technique is required. MPPT techniques with variable step-size of
perturbation track the maximum power point (MPP) with more efficiency. In this paper, a model of a fuzzy logic controller (FLC) for
determining the step-size of perturbation in duty-cycle of a photovoltaic electrical system to track MPP is presented. The model is
simulated in MATLAB/Simulink®.
Keywords: Maximum power point tracking, perturb and observe, boost converter, fuzzy logic control, membership
function, crisp universe, centre of area, pulse width modulation
Harvesting energy from the sun makes the photovoltaic (PV) power generation a promising technology. To obtain a consistent state of charge (SOC), consistent energy must be harvested and efficiently directed to the battery. Overcharging or undercharging phenomena decreases the lifetime of the battery. Besides, the effect of irradiance toward solar in term of sunlight intensity effects the efficiency and hence, sluggish the SOC. The main problem of the solar panel revealed when the temperature has increased, the efficiency of solar panel will also be decreased. This manuscript reports the finding of developing an automatic active cooling system for a solar panel with a real time energy monitoring system with internet-of-things (IoT) facility. The IoT technology assists user to measure the efficiency of the solar panel and SOC of the battery in real time from any locations. The automatic active cooling system is designed to improve the efficiency of the solar panel. The effectiveness of the proposed system is proven via the analysis of the effect of active cooling toward efficiency and SOC of photovoltaic system. The results also tabulate the comparative studies of active-to-passive cooling system, as well as the effect of cooling towards SOC and efficiency of the solar panel.
MODELING OF HYBRID WIND AND PHOTOVOLTAIC ENERGY SYSTEM USING A NEW CONVERTER ...elelijjournal
Renewable energy technologies offers clean, abundant energy gathered from self-renewing resources such as the sun, wind etc. As the power demand increases, power failure also increases. So, renewable energy sources can be used to provide constant loads. A new converter topology for hybrid wind/photovoltaic energy system is proposed. Hybridizing solar and wind power sources provide a realistic form of power generation.
The power generation using solar photovoltaic (PV) system in microgrid requires energy storage system due to their dilute and intermittent nature. The system requires efficient control techniques to ensure the reliable operation of the microgrid. This work presents dynamic power management using a decentralized approach. The control techniques in microgrid including droop controllers in cascade with proportional-integral (PI) controllers for voltage stability and power balance have few limitations. PI controllers alone will not ensure microgrid’s stability. Their parameters cannot be optimized for varying demand and have a slow transient response which increases the settling time. The droop controllers have lower efficiency. The load power variation and steady-state voltage error make the droop control ineffective. This paper presents a control scheme for dynamic power management by incorporating the combined PI and hysteresis controller (CPIHC) technique. The system becomes robust, performs well under varying demand conditions, and shows a faster dynamic response. The proposed DC microgrid has solar PV as an energy source, a lead-acid battery as the energy storage system, constant and dynamic loads. The simulation results show the proposed CPIHC technique efficiently manages the dynamic power, regulates DC link voltage and battery’s state of charge (SoC) compared to conventional combined PI and droop controller (CPIDC).
Grid-Connection Control and Simulation of PMSG Wind Power System Based on Mul...ijsrd.com
This dissertation proposes a wind energy conversion system is composed of a wind turbine PMSG, a rectifier, and an inverter. The wind turbine PMSG transforms the mechanical power from the wind into the electrical power, while the rectifier converts the AC power into DC power and controls the speed of the PMSG. The controllable inverter helps in converting the DC power to variable frequency and magnitude AC power. With the voltage oriented control, the inverter also possesses the ability to control the active and reactive powers injected into the grid. Multilevel inerter is used to step up the voltage and to reduce the THD. Here nine level and eleven level inverter are used and the voltage increases and THD reduces from 12.87 % to 7.46 %. Active and reactive power is controlled dc stabilization and the reactive power is near to unity Here PI controller is used to control the inverter output rms voltage and LC filter is used to remove the harmonics available in the system.
This paper presents the design and the implementation of a new microcontroller-based solar
Power inverter. The aim of this paper is to design single phase inverter which can convert DC voltage
to AC voltage at high efficiency and low cost. Solar and wind powered electricity generation are
being favored nowadays as the world increasingly focuses on environmental concerns. Power
inverters, which convert solar-cell DC into domestic-use AC, are one of the key technologies for
delivering efficient AC power The hardware and software design are oriented towards a single-chip
microcontroller-based system, hence minimizing the size and cost. With this new approach the
modularization of the conversion from solar power to electric power at its maximum power point can
be made more compact and more reliable.
Modelling of fuzzy logic controller for variable step mppt in photovoltaic sy...eSAT Journals
Abstract
The output power of photovoltaic electrical systems is highly dynamic and non-linear in nature. In order to extract maximum power
from such systems, maximum power point tracking (MPPT) technique is required. MPPT techniques with variable step-size of
perturbation track the maximum power point (MPP) with more efficiency. In this paper, a model of a fuzzy logic controller (FLC) for
determining the step-size of perturbation in duty-cycle of a photovoltaic electrical system to track MPP is presented. The model is
simulated in MATLAB/Simulink®.
Keywords: Maximum power point tracking, perturb and observe, boost converter, fuzzy logic control, membership
function, crisp universe, centre of area, pulse width modulation
Harvesting energy from the sun makes the photovoltaic (PV) power generation a promising technology. To obtain a consistent state of charge (SOC), consistent energy must be harvested and efficiently directed to the battery. Overcharging or undercharging phenomena decreases the lifetime of the battery. Besides, the effect of irradiance toward solar in term of sunlight intensity effects the efficiency and hence, sluggish the SOC. The main problem of the solar panel revealed when the temperature has increased, the efficiency of solar panel will also be decreased. This manuscript reports the finding of developing an automatic active cooling system for a solar panel with a real time energy monitoring system with internet-of-things (IoT) facility. The IoT technology assists user to measure the efficiency of the solar panel and SOC of the battery in real time from any locations. The automatic active cooling system is designed to improve the efficiency of the solar panel. The effectiveness of the proposed system is proven via the analysis of the effect of active cooling toward efficiency and SOC of photovoltaic system. The results also tabulate the comparative studies of active-to-passive cooling system, as well as the effect of cooling towards SOC and efficiency of the solar panel.
Development and Analysis of Fuzzy Control for MPPT Based Photovoltaic SystemIJERD Editor
In PV system control of Power electronics converters are very essential for the efficient utilization
of the solar System. This paper proposes modified Perturb & Observe Maximum power point tracking (MPPT)
with a fuzzy controller for DC-DC boost converter control in Photovoltaic system under shading and varying
atmospheric conditions. This paper proposes a different approach for MPPT of PV system so as to obtain
maximum power from PV system. In conventional methods, tracking power contains oscillation in the output
power. The Simulation and modeling of Photovoltaic system along with proposed algorithm are done using
MATLAB/SIMLINK software. Form Simulation results shows that P & O based fuzzy controller algorithm is
transient state is fast, less fluctuations and smooth in signal of generated power.
This paper deals with an advanced design for a pump powered by solar energyto supply agricultural lands with water and also the maximum power point is used to extract the maximum value of the energy available inside the solar panels and comparing between techniques MPPT such as Incremental conductance, perturb & observe, fractional short current circuit, and fractional open voltage circuit to find the best technique among these. The solar system is designed with main parts: photovoltaic (PV) panel, direct current/direct current (DC/DC) converter, inverter, filter, and in addition, the battery is used to save energy in the event that there is an increased demand for energy and not to provide solar radiation, as well as saving energy in the case of generation more than demand. This work was done using the matrix laboratory (MATLAB) simulink program.
Solar energy based impedance-source inverter for grid systemIJECEIAES
In this work, the fickleness of solar energy can be overcome by using Maximum Power Point Tracking algorithm (MPPT). Perturb and Observation (P&O) MPPT algorithm accomplish fast the maximum power point for rapid change of environmental conditions such as irradiance intensity and temperature. The MPPT algorithm applied to solar PV system keep the boost converter output constant. Output from boost converter is taken to three phase impedance-source inverter with RL load and grid system. Impedance-source inverter performs the transformation of variable DC output of the solar PV system in to near sinusoidal AC output. This near sinusoidal AC output consecutively is served to the RL load first and then to grid system. The simulation is carried out in matlab/simulink platform both for RL load and grid system and the simulation results are experimentally validated for RL load arrangement only.
Photovoltaic System with SEPIC Converter Controlled by the Fuzzy LogicIAES-IJPEDS
In this work, a fuzzy logic controller is used to control the output voltage of a
photovoltaic system with a DC-DC converter; type Single Ended Primary
Inductor Converter (SEPIC). The system is designed for 210 W solar
photovoltaic (SCHOTT 210) panel and to feed an average demand of 78 W.
This system includes solar panels, SEPIC converter and fuzzy logic
controller. The SEPIC converter provides a constant DC bus voltage and its
duty cycle controlled by the fuzzy logic controller which is needed to
improve PV panel’s utilization efficiency. A fuzzy logic controller (FLC) is
also used to generate the PWM signal for the SEPIC converter.
Implementation of Buck-Boost Converter as Low Voltage Stabilizer at 15 VIJECEIAES
This paper presents the implementation of the buck-boost converter design which is a power electronics applications that can stabilize voltage, even though the input voltage changes. Regulator to stabilize the voltage using PWM pulse that triger pin 2 on XL6009. In this design of buck-boost converter is implemented using the XL6009, LM7815 and TIP2955. LM7815 as output voltage regulator at 15V with 1A output current, while TIP2955 is able to overcome output current up to 5A. When the LM7815 and TIP2955 are connected in parallel, the converter can increase the output current to 6A.. Testing is done using varied voltage sources that can be set. The results obtained from this design can be applied to PV (Photovoltaic) and WP (Wind Power), with changes in input voltage between 3-21V dc can produce output voltage 15V.
High gain dc-dc step up converters have been used in renewable energy systems, for example, photovoltaic grid connected system and fuel cell power plant to step up the low level dc voltage to a high level dc bus voltage. If the conventional boost converter is to meet this demand, it should be operated at an extreme duty cycle (duty cycle closes to unity), which will cause electromagnetic interference, reverse recovery problem and conduction loss at the power switches. This paper proposes a class of non-isolated dc-dc step up converters which provide very high voltage gain at a small duty cycle (duty cycle < 0.5). Firstly, the converter topologies are derived based on active switched inductor network and combination of active and passive switched inductor networks; secondly, the modes of operation of proposed active switched inductor converter and combined active and passive switched inductor converter are illustrated; thirdly, the performance of the proposed converters are analyzed mathematically in details and compared with conventional boost converter. Finally, the analysis is verified by simulation results.
MODELING AND SIMULATION OF SOLAR PHOTOVOLTAIC APPLICATION BASED MULTILEVEL IN...ecij
As the solar market is blooming and forecasted to continue this trend in the coming years. The efficiency and reliability of PV based system has always been a contention among researchers. Therefore, multilevel inverters are gaining more assiduity as it has multitude of benefits. It offers high power capability along with low output harmonics. The main disadvantage of MLI is its complexity and requirement of large
number of power devices and passive components. This paper presents a topology that achieves 37.5% reduction in number of passive components and power devices for five-level inverter. This topology is basically based on H-bridge with bi-directional auxiliary switch. This paper includes a stand-alone PV
system in which designing and simulation of Boost converter connected with multilevel inverter for ac load is presented. Perturb and observe MPPT algorithm has been implemented to extract maximum power. The premier objective is to obtain Voltage with less harmonic distortion economically. Multicarrier Sinusoidal PWM techniques have been implemented and analysed for modulation scheme. The Proposed system is
simulated n MATLAB/Simulink platform.
A hybrid DC/DC/AC converter connected to the grid without a three-phase transformer is controlled. The decentralized control method is applied to the hybrid DC-DC converter such that the maximum power of PV flows to the grid side. This controller must charge and discharge the battery at the proper time. It must also regulate DC-link voltage. An additional advantage of the proposed control is that the three-phase inverter does not need a separate controller such as PWM and SPWM. A simple technique is used for creating the desired phase shift in the three-phase inverter, which makes the active and reactive power of the inverter controllable. A new configuration is also proposed to transmit and manage the generation power of PV. In this scheme, the battery and fuel cell are employed as an auxiliary source to manage the generation power of PV. Finally, a real-time simulation is performed to verify the effectiveness of the proposed controller and system by considering the real characteristics of PV and FC.
MPPT oscillations minimization in PV system by controlling non-linear dynamic...IJECEIAES
Solar PV power generation has achieved rapid growth in developing countries which has many merits such as absence of noise, longer life, no pollution, less time for installation, and ease of grid interface. A maximum power point tracking circuit (MPPT) consists of DC-DC power electronics converters that are used to improve the energy attainment from solar PV array. This paper presents a detailed analysis to control of chaos, a non-linear dynamic in SEPIC DC-DC converter interfaced solar PV system, to minimize the oscillations near to MPP. In SEPIC DC-DC converter, the input inductor current is continuous and capable of sweeping the whole I-V curve of a PV module from open circuit voltage (V oc ) to short circuit current (I sc ) operating points. To trace the true maximum power point and to nullify the oscillations near to MPP, the yield output voltage needs to ensure period-1 operation.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
An improved luo converter for high power applicationseSAT Journals
Abstract
Power conversion is one of the major requirements in various industries and in daily life. Among various types of power
conversion, DC-DC conversion has greater importance. DC-DC conversion can be reliably performed using luo converter. It
employs voltage lift technique so that output voltage is increased stage by stage, in arithmetic progression. Luo converter can be
incorporated with the Z network or impedance network so as to ensure simple start up and smooth power conversion. An
impedance network consist of two identical inductors and two identical capacitors connected in ‘X’ shape. Besides power
conversion it also offers filtering operation. The luo converter in this scheme is of switched capacitor type. It helps to provide
regulated output voltage from an unregulated source of power supply. The major benefits of this proposed scheme is that it
combines the advantages of the switched capacitor, voltage lift technique and the impedance network. Hence the proposed scheme
has various advantages such as high power density, larger range of output DC voltage, lower or no inrush current, lower
harmonic injection, simple circuit, high voltage transfer gain, can process upto several tens of watts of power. The simulation
analysis and the hardware implementation shows that the output voltage obtained is higher than the expected theoretical value.
i.e, it is the highly boosted voltage output.
Keywords: Z-network, boost voltage, voltage lift technique
Harmonic AnalysisofDistribution System Due to Embedded Generation InjectionIJRESJOURNAL
ABSTRACT:The increased demand for electricity and the depletion of fossil energy sources are a challenge to exploit new and renewable energy sources. Relatively cheap renewable energy sources are Wind Power Plant (WPP) and Photovoltaic System (PV). Currently, many small scale generating plants are being evolved into conventional systems known as Embedded Generation (EG). EG as a source of electricity in the distribution system will affect the flow of system power, system reliability, voltage profile and others. Besides, with the placement of converter technology in WPP and PV system will give contribution of harmonic enhancement to the system. This paper presents the harmonic analysis of WPP and PV designs that are injected into conventional distribution system in one bus at Pujon feeder station Malang, Indonesia. The bus is chosen because in this area the need for electric power in the area is very high and the existing system has a harmonic value of 11%. Hybrid Active Filter (HAF) is designed to lower the voltage harmonics due to EG injection into existing systems without affecting harmonics in other buses. To analyze the harmonics in this study there are 4 scenarios offered: Scenario 1 starts with analysis on existing system, scenario 2 existing in WPP 2 MVA injection, scenario 3, injection1.3 MVA PV, scenario 4 injected EG (WPP and PV). The simulation result using PSCAD 4.5 shows in scenario 4 to generate harmonic voltage of 18.6% and after added with HAF, the harmonic value of the voltage becomes 2.434%
The inverter is the principal part of the photovoltaic (PV) systems that assures the direct current/alternating current (DC/AC) conversion (PV array is connected directly to an inverter that converts the DC energy produced by the PV array into AC energy that is directly connected to the electric utility). In this paper, we present a simple method for detecting faults that occurred during the operation of the inverter. These types of faults or faults affect the efficiency and cost-effectiveness of the photovoltaic system, especially the inverter, which is the main component responsible for the conversion. Hence, we have shown first the faults obtained in the case of the short circuit. Second, the open circuit failure is studied. The results demonstrate the efficacy of the proposed method. Good monitoring and detection of faults in the inverter can increase the system's reliability and decrease the undesirable faults that appeared in the PV system. The system behavior is tested under variable parameters and conditions using MATLAB/Simulink.
In order to meet the increase in energy demand globally it is necessary to harness renewable energy at its maximum potential for the purpose of electric power generation. For the achievement of high output voltage and efficiency DC-DC converters plays a vital role in low voltage PV array and fuel cells. LUO converters are gaining importance because of geometric progression output. . LUO converters find its application because of high transient performance of the system, high power transfer gain, efficiency and reduced ripple .Because of load and line disturbances the output voltage of DC-DC converter must be operated in closed loop mode. This paper interpolates multitudinous controller for positive output elementary super lift LUO converter (POESLL). The pursuance of the converter under manifold such as variation in input, load are developed and compared for current mode controller and SMC.
Design and Simulation of Efficient DC-DC Converter Topology for a Solar PV Mo...Sajin Ismail
Modulated Integrated Converter systems are considered to be the new and global turning point in the field of
Solar PV systems. These converters are highly recognised for its modular size and compact nature and they are supposed to
be attached directly with each PV module and since one PV module is having the power rating of a few watts ranging from
0-500Ws, the design rating would be in the same range and thus the most vital condition in such a design is efficiency
under these relatively low loads. In this paper an isolated interleaved boost converter topology is considered in the DC-DC
section and which is designed and simulated for a specific power rating (250W) and the efficiency is analysed with varying
load conditions and compared with the target efficiency of the system.
Development and Analysis of Fuzzy Control for MPPT Based Photovoltaic SystemIJERD Editor
In PV system control of Power electronics converters are very essential for the efficient utilization
of the solar System. This paper proposes modified Perturb & Observe Maximum power point tracking (MPPT)
with a fuzzy controller for DC-DC boost converter control in Photovoltaic system under shading and varying
atmospheric conditions. This paper proposes a different approach for MPPT of PV system so as to obtain
maximum power from PV system. In conventional methods, tracking power contains oscillation in the output
power. The Simulation and modeling of Photovoltaic system along with proposed algorithm are done using
MATLAB/SIMLINK software. Form Simulation results shows that P & O based fuzzy controller algorithm is
transient state is fast, less fluctuations and smooth in signal of generated power.
This paper deals with an advanced design for a pump powered by solar energyto supply agricultural lands with water and also the maximum power point is used to extract the maximum value of the energy available inside the solar panels and comparing between techniques MPPT such as Incremental conductance, perturb & observe, fractional short current circuit, and fractional open voltage circuit to find the best technique among these. The solar system is designed with main parts: photovoltaic (PV) panel, direct current/direct current (DC/DC) converter, inverter, filter, and in addition, the battery is used to save energy in the event that there is an increased demand for energy and not to provide solar radiation, as well as saving energy in the case of generation more than demand. This work was done using the matrix laboratory (MATLAB) simulink program.
Solar energy based impedance-source inverter for grid systemIJECEIAES
In this work, the fickleness of solar energy can be overcome by using Maximum Power Point Tracking algorithm (MPPT). Perturb and Observation (P&O) MPPT algorithm accomplish fast the maximum power point for rapid change of environmental conditions such as irradiance intensity and temperature. The MPPT algorithm applied to solar PV system keep the boost converter output constant. Output from boost converter is taken to three phase impedance-source inverter with RL load and grid system. Impedance-source inverter performs the transformation of variable DC output of the solar PV system in to near sinusoidal AC output. This near sinusoidal AC output consecutively is served to the RL load first and then to grid system. The simulation is carried out in matlab/simulink platform both for RL load and grid system and the simulation results are experimentally validated for RL load arrangement only.
Photovoltaic System with SEPIC Converter Controlled by the Fuzzy LogicIAES-IJPEDS
In this work, a fuzzy logic controller is used to control the output voltage of a
photovoltaic system with a DC-DC converter; type Single Ended Primary
Inductor Converter (SEPIC). The system is designed for 210 W solar
photovoltaic (SCHOTT 210) panel and to feed an average demand of 78 W.
This system includes solar panels, SEPIC converter and fuzzy logic
controller. The SEPIC converter provides a constant DC bus voltage and its
duty cycle controlled by the fuzzy logic controller which is needed to
improve PV panel’s utilization efficiency. A fuzzy logic controller (FLC) is
also used to generate the PWM signal for the SEPIC converter.
Implementation of Buck-Boost Converter as Low Voltage Stabilizer at 15 VIJECEIAES
This paper presents the implementation of the buck-boost converter design which is a power electronics applications that can stabilize voltage, even though the input voltage changes. Regulator to stabilize the voltage using PWM pulse that triger pin 2 on XL6009. In this design of buck-boost converter is implemented using the XL6009, LM7815 and TIP2955. LM7815 as output voltage regulator at 15V with 1A output current, while TIP2955 is able to overcome output current up to 5A. When the LM7815 and TIP2955 are connected in parallel, the converter can increase the output current to 6A.. Testing is done using varied voltage sources that can be set. The results obtained from this design can be applied to PV (Photovoltaic) and WP (Wind Power), with changes in input voltage between 3-21V dc can produce output voltage 15V.
High gain dc-dc step up converters have been used in renewable energy systems, for example, photovoltaic grid connected system and fuel cell power plant to step up the low level dc voltage to a high level dc bus voltage. If the conventional boost converter is to meet this demand, it should be operated at an extreme duty cycle (duty cycle closes to unity), which will cause electromagnetic interference, reverse recovery problem and conduction loss at the power switches. This paper proposes a class of non-isolated dc-dc step up converters which provide very high voltage gain at a small duty cycle (duty cycle < 0.5). Firstly, the converter topologies are derived based on active switched inductor network and combination of active and passive switched inductor networks; secondly, the modes of operation of proposed active switched inductor converter and combined active and passive switched inductor converter are illustrated; thirdly, the performance of the proposed converters are analyzed mathematically in details and compared with conventional boost converter. Finally, the analysis is verified by simulation results.
MODELING AND SIMULATION OF SOLAR PHOTOVOLTAIC APPLICATION BASED MULTILEVEL IN...ecij
As the solar market is blooming and forecasted to continue this trend in the coming years. The efficiency and reliability of PV based system has always been a contention among researchers. Therefore, multilevel inverters are gaining more assiduity as it has multitude of benefits. It offers high power capability along with low output harmonics. The main disadvantage of MLI is its complexity and requirement of large
number of power devices and passive components. This paper presents a topology that achieves 37.5% reduction in number of passive components and power devices for five-level inverter. This topology is basically based on H-bridge with bi-directional auxiliary switch. This paper includes a stand-alone PV
system in which designing and simulation of Boost converter connected with multilevel inverter for ac load is presented. Perturb and observe MPPT algorithm has been implemented to extract maximum power. The premier objective is to obtain Voltage with less harmonic distortion economically. Multicarrier Sinusoidal PWM techniques have been implemented and analysed for modulation scheme. The Proposed system is
simulated n MATLAB/Simulink platform.
A hybrid DC/DC/AC converter connected to the grid without a three-phase transformer is controlled. The decentralized control method is applied to the hybrid DC-DC converter such that the maximum power of PV flows to the grid side. This controller must charge and discharge the battery at the proper time. It must also regulate DC-link voltage. An additional advantage of the proposed control is that the three-phase inverter does not need a separate controller such as PWM and SPWM. A simple technique is used for creating the desired phase shift in the three-phase inverter, which makes the active and reactive power of the inverter controllable. A new configuration is also proposed to transmit and manage the generation power of PV. In this scheme, the battery and fuel cell are employed as an auxiliary source to manage the generation power of PV. Finally, a real-time simulation is performed to verify the effectiveness of the proposed controller and system by considering the real characteristics of PV and FC.
MPPT oscillations minimization in PV system by controlling non-linear dynamic...IJECEIAES
Solar PV power generation has achieved rapid growth in developing countries which has many merits such as absence of noise, longer life, no pollution, less time for installation, and ease of grid interface. A maximum power point tracking circuit (MPPT) consists of DC-DC power electronics converters that are used to improve the energy attainment from solar PV array. This paper presents a detailed analysis to control of chaos, a non-linear dynamic in SEPIC DC-DC converter interfaced solar PV system, to minimize the oscillations near to MPP. In SEPIC DC-DC converter, the input inductor current is continuous and capable of sweeping the whole I-V curve of a PV module from open circuit voltage (V oc ) to short circuit current (I sc ) operating points. To trace the true maximum power point and to nullify the oscillations near to MPP, the yield output voltage needs to ensure period-1 operation.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
An improved luo converter for high power applicationseSAT Journals
Abstract
Power conversion is one of the major requirements in various industries and in daily life. Among various types of power
conversion, DC-DC conversion has greater importance. DC-DC conversion can be reliably performed using luo converter. It
employs voltage lift technique so that output voltage is increased stage by stage, in arithmetic progression. Luo converter can be
incorporated with the Z network or impedance network so as to ensure simple start up and smooth power conversion. An
impedance network consist of two identical inductors and two identical capacitors connected in ‘X’ shape. Besides power
conversion it also offers filtering operation. The luo converter in this scheme is of switched capacitor type. It helps to provide
regulated output voltage from an unregulated source of power supply. The major benefits of this proposed scheme is that it
combines the advantages of the switched capacitor, voltage lift technique and the impedance network. Hence the proposed scheme
has various advantages such as high power density, larger range of output DC voltage, lower or no inrush current, lower
harmonic injection, simple circuit, high voltage transfer gain, can process upto several tens of watts of power. The simulation
analysis and the hardware implementation shows that the output voltage obtained is higher than the expected theoretical value.
i.e, it is the highly boosted voltage output.
Keywords: Z-network, boost voltage, voltage lift technique
Harmonic AnalysisofDistribution System Due to Embedded Generation InjectionIJRESJOURNAL
ABSTRACT:The increased demand for electricity and the depletion of fossil energy sources are a challenge to exploit new and renewable energy sources. Relatively cheap renewable energy sources are Wind Power Plant (WPP) and Photovoltaic System (PV). Currently, many small scale generating plants are being evolved into conventional systems known as Embedded Generation (EG). EG as a source of electricity in the distribution system will affect the flow of system power, system reliability, voltage profile and others. Besides, with the placement of converter technology in WPP and PV system will give contribution of harmonic enhancement to the system. This paper presents the harmonic analysis of WPP and PV designs that are injected into conventional distribution system in one bus at Pujon feeder station Malang, Indonesia. The bus is chosen because in this area the need for electric power in the area is very high and the existing system has a harmonic value of 11%. Hybrid Active Filter (HAF) is designed to lower the voltage harmonics due to EG injection into existing systems without affecting harmonics in other buses. To analyze the harmonics in this study there are 4 scenarios offered: Scenario 1 starts with analysis on existing system, scenario 2 existing in WPP 2 MVA injection, scenario 3, injection1.3 MVA PV, scenario 4 injected EG (WPP and PV). The simulation result using PSCAD 4.5 shows in scenario 4 to generate harmonic voltage of 18.6% and after added with HAF, the harmonic value of the voltage becomes 2.434%
The inverter is the principal part of the photovoltaic (PV) systems that assures the direct current/alternating current (DC/AC) conversion (PV array is connected directly to an inverter that converts the DC energy produced by the PV array into AC energy that is directly connected to the electric utility). In this paper, we present a simple method for detecting faults that occurred during the operation of the inverter. These types of faults or faults affect the efficiency and cost-effectiveness of the photovoltaic system, especially the inverter, which is the main component responsible for the conversion. Hence, we have shown first the faults obtained in the case of the short circuit. Second, the open circuit failure is studied. The results demonstrate the efficacy of the proposed method. Good monitoring and detection of faults in the inverter can increase the system's reliability and decrease the undesirable faults that appeared in the PV system. The system behavior is tested under variable parameters and conditions using MATLAB/Simulink.
In order to meet the increase in energy demand globally it is necessary to harness renewable energy at its maximum potential for the purpose of electric power generation. For the achievement of high output voltage and efficiency DC-DC converters plays a vital role in low voltage PV array and fuel cells. LUO converters are gaining importance because of geometric progression output. . LUO converters find its application because of high transient performance of the system, high power transfer gain, efficiency and reduced ripple .Because of load and line disturbances the output voltage of DC-DC converter must be operated in closed loop mode. This paper interpolates multitudinous controller for positive output elementary super lift LUO converter (POESLL). The pursuance of the converter under manifold such as variation in input, load are developed and compared for current mode controller and SMC.
Design and Simulation of Efficient DC-DC Converter Topology for a Solar PV Mo...Sajin Ismail
Modulated Integrated Converter systems are considered to be the new and global turning point in the field of
Solar PV systems. These converters are highly recognised for its modular size and compact nature and they are supposed to
be attached directly with each PV module and since one PV module is having the power rating of a few watts ranging from
0-500Ws, the design rating would be in the same range and thus the most vital condition in such a design is efficiency
under these relatively low loads. In this paper an isolated interleaved boost converter topology is considered in the DC-DC
section and which is designed and simulated for a specific power rating (250W) and the efficiency is analysed with varying
load conditions and compared with the target efficiency of the system.
Real Time Implementation of Variable Step Size Based P&O MPPT for PV Systems ...IJPEDS-IAES
Nowadays Solar energy is an important energy source due to the energy crisis and environment pollution. Maximum power point tracking (MPPT) algorithm improves the utilization efficiency of a photovoltaic systems. In this paper an improved P&O MPPT algorithm is developed and simulated using MATLAB / SIMULINK to control the DC/DC buck converter. The obtained simulink model is also verified using dspace tool. Both the simulated and experimental results are validated by also comparing them with conventional MPPT methods. The performance measures show the increase in the efficiency of PV system by the proposed model.
Incremental Conductance MPPT Algorithm for PV System Implemented Using DC-DC ...IJERA Editor
The two basic topologies of switch mode DC-DC converters (Buck and Boost) are analyzed with a view of their use in PV (photovoltaic) systems, as the photovoltaic generator exhibits non-linear characteristics due to the change in environmental condition and load variation. As the efficiency of PV panels is low it becomes mandatory to extract maximum power from the PV panel at a given period of time. Several MPPT algorithms with different types of converters are being proposed for extracting maximum power from the PV panel. It is found that the nature of load plays an important role in the choice of topology. This paper investigates the implementation issues of Incremental Conductance method with Buck and Boost Converters. Mathematical analysis and desirable steady-state operating point of the converters are derived to give satisfactory maximum power point tracking operation.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Maximum PowerPoint Tracking of PV System Based on a SEPIC Converter Using Fuz...IJERA Editor
This paper presents the MPPT (Maximum power point tracking) operation of PV (Photovoltaic) system based
on a SEPIC (Single Ended Primary Inverter Converter) converter using fuzzy logic controller. MPPT method
such as Incremental conductance base on FLC (Fuzzy Logic Controller) is used to extract maximum output
power of the PV system. PV energy is the most essential energy resources since it is pollution free, clean and
endless. The FLC proposed scheme is interface with the MPPT to generate the PWM (Pulse Width Modulation)
for the SEPIC controller for maximum power point tracking operation.FLChas used Mamdani’s method for
convergent and divergent of membership function. FLC is used for more efficient performance under the
variation in different atmosphere. The fuzzy logic controller with SEPIC for MPPT scheme extract the
maximum power point tracking without any change in the voltage at the inverter at different load condition. The
behavior of the converter and controller tested in simulation at different operating conditions. Proposed scheme
is used for accurately tracking maximum point and also send the smooth, error free signal to the inverter.
Maximum PowerPoint Tracking of PV System Based on a SEPIC Converter Using Fuz...IJERA Editor
This paper presents the MPPT (Maximum power point tracking) operation of PV (Photovoltaic) system based
on a SEPIC (Single Ended Primary Inverter Converter) converter using fuzzy logic controller. MPPT method
such as Incremental conductance base on FLC (Fuzzy Logic Controller) is used to extract maximum output
power of the PV system. PV energy is the most essential energy resources since it is pollution free, clean and
endless. The FLC proposed scheme is interface with the MPPT to generate the PWM (Pulse Width Modulation)
for the SEPIC controller for maximum power point tracking operation.FLChas used Mamdani’s method for
convergent and divergent of membership function. FLC is used for more efficient performance under the
variation in different atmosphere. The fuzzy logic controller with SEPIC for MPPT scheme extract the
maximum power point tracking without any change in the voltage at the inverter at different load condition. The
behavior of the converter and controller tested in simulation at different operating conditions. Proposed scheme
is used for accurately tracking maximum point and also send the smooth, error free signal to the inverter
A Integrated Technique of SIDO PFC Fly back Converter in power systemIJMTST Journal
Energy saving is the major international efforts to control down the global warming .Power electronics based devices has being improving day by day for saving the electrical energy in the power grids. The govt. of India is also contributing several projects based on energy conservation. The Designing of a single-inductor dual output (SIDO) fly-back power factor correction (PFC) converter is proposed, in which the PFC and power conversion are done at the same time, multiplexing of a single-inductor is implemented through which each output can be regulated independently. The converter will be operating under in critical conduction mode (CRM). A SIDO PFC converter is a system of dual efficient DC output obtained from the AC source, it can also be replaced by solar panel and our system is capable of running a dc motor also, fly back converter can be used in both ac-dc and dc-dc conversion process. The efficiency along with power factor, total harmonic distortion (THD), settling time and output accuracy of this converter will be improved by implementing the neural network as controllers in the system
The performance of PV panel is very much dependent on the amount of sun light as well as the temperature of the surrounding environment which normally hard to be predicted. The use of PV emulator in the investigation of solar inverter especially at a lab scale platform helps to mitigate the inconsistency factors due to this uncontrollable variation. This work discussed on the design and development of a PV emulator for the grid-connected quasi-Z-source inverter which has different topology and control method compared to the conventional voltage source inverter. The I-V characteristics of the PV panel is modelled from the commercially available product and through circuit analysis the relation between capacitor voltage control and the PV terminal voltage is established, thus realizing the MPPT operation. Results from both simulation and experimental verification demonstrated that the PV emulator successfully able to produce power for the inverter according to the requirement.
Performance analysis of active clamped interleaved fly-back inverter for phot...eSAT Journals
Abstract
A new control strategy has been proposed for the interleaved flyback inverter. the proposed method consists of two control strategies,
they are active clamp control and phase control. Based on the output power of the PV module each converter phase of an ILFI i s
controlled. due to the active clamp control method the energy in the leakage inductance can be fully recycled. the concept of
interleaving reduces the ripple and reduces the usage of capacitors. The induction motor drive has been used the speed performance
of the drive has been analyzed .simulations are done using MATLAB. The parameters are analyzed without PV and with PV. The
explanations, theories and results are discussed further.
Keywords- interleaved flyback inverter, active clamp, photovoltaic, induction motor drive
Simulation of various DC-DC converters for photovoltaic systemIJECEIAES
This work explains the comparison of various dc-dc converters for photovoltaic systems. In recent day insufficient energy and continues increasing in fuel cost, exploration on renewable energy system becomes more essential. For high and medium power applications, high input source from renewable systems like photovoltaic and wind energy system turn into difficult one, which leads to increase of cost for installation process. So the generated voltage from PV system is boosted with help various boost converter depends on the applications. Here the various converters are like boost converter, buck converter, buck-boost converter, cuk converter, sepic converter and zeta converter are analysed for photovoltaic system, which are verified using matlab / simulink.
Drive Applications of Fuzzy Logic Controlled Interleaved Boost Converter for ...EECJOURNAL
The improvement in the efficiency, a reduced ripple and reduction in the passive elements is proposed in this project through the interleaved boost converter. The interleaved boost converter operates multiple phase approach, is used for the power factor control applications. The proposed converter is used to extract the power output from the solar panel with reduced ripple losses and greater efficiency thereby obtaining the maximum power from the solar panel. The control of the current with energy saving method is obtained with the efficiency of 95%. The converter operation is controlled by the fuzzy logic controller to operate the switches with the finest and reduced power loss constrains. The proposed method is mathematically modeled and the results are analysed. A similar prototype model is designed and the results are compared with the theoretical values.
Similar to A Study of SEPIC Converter Based Fuzzy Logic Controller For Hybrid System (20)
Integration of Unified Power Quality Controller with DGIJRST Journal
This paper gives an insight into the analytical results of the intergration of Unified power quality controller (conditioner) with distribution generation system. The intergration is achieved by connecting the DClink throught rectifier to the distribution generatoion along with thwe connection of the series and shunt inverter to the same dc link. This type of connection can account for the voltage sag, voltage swell, along with the reduction of harmonics and also compensation of reactive power. The analysis is supported with the simulation which will are discussed in detail in the paper.
An Efficient User Privacy and Protecting Location Content in Location Based S...IJRST Journal
In location-based query a user wants to query a database of location data, known as Points Of Interest (POIs), and does not want to reveal his/her location to the server due to privacy concerns; (ii) the owner of the location data, that is, the location server, do Abstract: Nowadays, it is very easy for a person to learn his/her location with the help of a Global Positioning System (GPS) enabled device. A location s not want to simply distribute its data to all users. The location server desires to have some control over its data, since the data is its asset. A major enhancement upon previous solutions by introducing a two stage approach, the first step is based on Oblivious Transfer using homomorphic encryption and the second step is based on Private Information Retrieval, to achieve a secure solution for both parties. Introduce a security model and analyse the security in the context of our protocol. To highlight a security weakness of our previous work and present a solution using efficient homomorphic system.
A Particle Swarm Optimization for Optimal Reactive Power DispatchIJRST Journal
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A Novel Approach for Interference Suppression Using a Improved LMS Based Adap...IJRST Journal
A novel adaptive beam forming technique is proposed for wireless communication applications based on the minimum bit error rate (MBER) criterion known as LMS algorithm. LMS (Least Mean Square) algorithm is used for steering the antenna beam electronically. Using the Rectangular, Hamming, Kaiser, Chebyshev windows both the block-data and sample-by-sample adaptive implementations of the MBER solution are developed. By making use of window techniques half power beam width of an antenna is enhanced using Matlab simulation. The gain of the system will definitely improve the performance of CDMA based system, where the number of interferes is quite large and helps to increase the spectral efficiency of wireless communication systems. Any beam former that can depress the large number of interferers will improve the capacity and performance. Such beam formers are called smart antennas. They improve signal to interference ratio (SIR) of the communication system efficiently by forming narrow beam towards desired user and low side towards undesired users. Smart antennas offer a broad range of ways to improve wireless system performance.
Support Vector Machine for Wind Speed PredictionIJRST Journal
The energy is a vital input for the social and economic development of any nation. With increasing agricultural and industrial activities in the country, the demand for energy is also increasing. The increasing use of natural and renewable energy sources is needed to take the burden of our current dependency on fossil fuels. Development and analysis of renewable energy models helps utility in energy forecasting, planning, research and policy making. The wind power is a clean, inexhaustible, and almost a free source of energy. But the integration of wind parks with the power grid has resulted in many challenges for the utility in terms of commitment and control of power plants. As wind speed and wind direction fluctuate frequently, the accurate long-term and short-term forecasting of wind speed is important for ascertaining the wind power generation availability. To deal with wind speed forecasting, many methods have been developed such as physical method, which use lots of physical considerations to reach the best forecasting precision and other is the statistical method, which specializes in finding the relationship of the measured power data. Wind speed can be predicted by using time series analysis, artificial neural network, Kalman Filter method, linear prediction method, spatial correlation models and wavelet, also by using the support vector machines. In this paper, the SVM is used for day ahead prediction of wind speed using historical data of wind park. In this paper Support Vector Machine (SVM) results are compared with feedforward Backpropagation neural network. It is observed that the Mean Absolute Percentage Error (MAPE) by SVM method is around 7% and correlation coefficient is close to 1. This justifies the ability of SVM for wind speed prediction task than Backpropagation algorithm.
Performance Evaluation of Computationally Efficient Energy Detection Based Sp...IJRST Journal
The rapid growth of bandwidth demanding wireless technologies has led to the problem of spectrum scarcity. However, studies show that licensed spectrum is underutilized. Cognitive radio technology promises a solution to the problem by allowing unlicensed users, access to the licensed bands opportunistically. A prime component of the cognitive radio technology is spectrum sensing. Many spectrum sensing techniques have been developed to sense the presence or not of a licensed user. This paper evaluates the performance of the energy detection based spectrum sensing technique in noisy, fading, jamming, interference environments. Both single user detection and cooperative detection situations were investigated. Closed form solutions for the probabilities of detection and false alarm were derived. The analytical results were varied by numerical computations using Monte Carlo method with MATLAB. The performance of the computationally efficient energy detection (CE-ED) techniques were evaluated by use of Receiver Operating Characteristics (ROC) curves over additive white Gaussian noise (AWGN) and fading (Rayleigh & Nakagami-m) channels. Results show that for single user detection, the energy detection technique performs better in AWGN channel than in the fading channel models. The performance of cooperative detection is better than single user detection in fading environments.
The Internet of Things (IoT), also referred to as the Internet of Objects, will change everything—including ourselves. This may seem like a bold statement, but consider the impact the Internet already had on education, science, communication, business, government, and humanity. Clearly, the Internet is one of the most important and a powerful creation in all of human history. This paper discussesIOT architecture, IOT applications and limitations of IOT.
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This project addresses the problem of clock synchronization between a base station (BS) and a mobile station (MS). A conventional technique for clock synchronization is that the MS clock is derived from the downlink signal originated from a base station. In cellular systems, a base station and mobile stations need to be synchronized before data exchange. Since the base station clock reference is more accurate, a mobile station typically derives its clock reference from the base station. But the carrier frequency offset due to Doppler shift may have harmful effects on the local clock derivation. This project proposes a joint clock and frequency synchronization technique between a base station and a mobile station, which is effective even with Doppler shift. We derive the joint estimation algorithm by analyzing the phase and the amplitude distortion caused by the sampling frequency offset and the carrier frequency offset. Simulation results showing the effectiveness of the proposed algorithm will also be presented.
Analysis of Voltage and Current Variations in Hybrid Power SystemIJRST Journal
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DTC Scheme for a Four-Switch Inverter-Fed PMBLDC Motor Emulating the Six-Swit...IJRST Journal
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categories of compact objects. Although white dwarfs, neutron stars, brown
dwarfs, Black Holes etc.fall under the category of compact objects, each of
them is unique in its own way.
A Compact Remote Switching With Efficient Monitoring For AC PlantsIJRST Journal
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and process plant availability. Initially switching and monitoring were done
through manually and the control switches and level monitoring unit were
placed at separate places. Due to this, we cannot monitor all units at a time. In
our proposed system, remote switching and monitoring is done in the control
room itself. Majority of industries use distributed control system for high
reliability, improve response time, improved operator interface to plant,
improved accessibility of plant data.
Reactive Power Compensation in Distribution Network with Slide Mode MPPT Cont...IJRST Journal
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In this paper an efficient voltage control by using slide mode controller with
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designed so as to balance the power flow from PV panel to the grid and load
such that the PV power is utilized effectively. The design and simulation
using MATLAB is presented in this work.
Power Quality Improvement by UPQC based on Voltage Source ConvertersIJRST Journal
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2. 10 International Journal of Research in Science & Technology
A Study of SEPIC Converter Based Fuzzy Logic Controller For Hybrid System
II. SEPIC CONVERTER
The SEPIC is a DC to DC converter in which the output
voltage is having same polarity as that of input voltage. One
benefit of the SEPIC converter is that the input ripples current
in the input capacitor is continuous. This reduces the amount
of input capacitance necessary for low-ripple voltage, which
reduces EMI (Electro Magnetic Interference).SEPIC
converter maintains a fixed output voltage regardless of
whether the input voltage is above, equal or below the output
voltage.
Fig.1SEPIC converter
Fig.1. shows the SEPIC basic diagram. Vi is the input voltage
of the converter, Vo is the output voltage, L1 is the inductor
connected at the input end and the maximum load current
flows in this inductance. L2 is connected in parallel to the
load. The switch s1 is connected parallel with the input
voltage. The switch can be made on and off during the
operation.C1 is the coupling capacitor which stores the
voltage. The duty cycle D is defined by the general equation:
(1)
(2)
Where TON is the on-time of the switch and T is the switching
period. The duty cycle is a function of M, where M is the
voltage conversion ratio
(3)
From the equation (3) the M as function of D,
(4)
From the equation (4), the output voltage can be defined
as
= (5)
Fig. 2 SEPIC current flow when S1 is in ON condition
Fig. 3 SEPIC current flow when S1 is OFF condition.
A SEPIC is said to be in continuous conduction mode if
the current through the inductorL1 never falls to zero. During
a SEPIC's steady state operation, the average voltage across
capacitor C1 is equal to the input voltage. Because capacitor
C1 blocks direct current, the average current through C1 is
zero, making inductor L2 the only source of load current.
Therefore, the average current through inductor L2 is the
same as the average load current and hence independent of the
input voltage. The voltages are the same in magnitude as well
as above or below. The ripple currents from the two inductors
will be equal in magnitude. Fig 4. Shows SEPIC current flow
when S1 is turned on, current IL1 increases positive direction
and the current IL2 increases in the negative direction. The
energy to increase the current IL1 comes from the input
source. Since S1 is a short while closed, and the instantaneous
voltage VC1 is approximately VIN, the voltage VL2 is
approximately −VIN. Therefore, the capacitor C1supplies the
energy to increase the magnitude of the current in IL2 and
thus increase the energy stored in L2.Fig.5. Shows SEPIC
current flow when switchS1 is turned off, the current IC1
becomes the same as the current IL1, since inductors do not
allow instantaneous changes in current. The current IL2 will
continue in the negative direction, in fact it never reverses
direction. It can be seen from the diagram that a negative IL2
will add to the current IL1 to increase the current delivered to
the load. Using Kirchhoff's Current Law, it can be shown that
ID1 = IC1 - IL2. It can then be concluded, that while S1 is off,
power is delivered to the load from L2, L1 and C1 of energy
storage elements. And maintain the load voltage in constant.
3. 11 International Journal of Research in Science & Technology
Volume: 2 | Issue: 1 | January 2015 | ISSN: 2349-0845IJRST
Fig.4.Theoritcal waveform of SEPIC converter
III. PROPOSED SCHEME
Fig.5. illustrates the overall block diagram of the
proposed system with wind and PV resources. The main
energy sources of the hybrid system are transformed into wind
generator and PV modules. A multiple input sepic converter
allows the integration of the wind and PV energy resources
because this type of converter is more effective in maximum
power point tracking (MPPT) in PV modules and input
current control method used in the proposed system .MICS
were chosen for their cost effective and flexible method of
interfacing the two renewable energy sources.
The output voltage from the PV module is DC. Since the
output voltage of the wind generator is ac, three-phase diode
rectifier converts it into dc voltage. The dc voltages from the
PV module and three phase diode rectifier are given as inputs
to the switches of the sepic converter. The dc voltage is again
converted into ac by PWM inverter. The output voltage from
the inverter is given to the LC filter to reduce the harmonic
voltages in the ac load.
Fig .5 proposed scheme
IV. LITRATURE REVIEW
A. Maximum Power Point Tracking Using Fuzzy Logic
Control For Photovoltaic System
PongaskorTakun,SomyotKaitwandidvilaiandChaiyanJett
anasen proposes Maximum Power Point Tracking using
Fuzzy Logic cotrol for Photovoltaic systems. In this paper, a
fuzzy logic control (FLC) is proposed to control the
maximum powerpoint tracking (MPPT) for a photovolaic
(PV) system. The proposed TEcnique uses the fuzzy logic
control to specify the size of incremental current in the
current command of MPPT. As results indicated, the
convergence time of maximum power point (MPP) of the
proposed algorithm is better than that of the conventional
Petrub and Observation (P&O) tecnique.
In our world tody, the problems caused by global warming
and polution effect become the important issues for research.
Renewable energy sources are considerd as a tecnolgical
option for generating clean energy. Among them,
photovoltaic (PV) system has received agreat attention as it
appears to be one of the most promissing renwable energy
sources. Recently,due to its development and cost reduction,
PV system becomes an efficient solution to the
environmental problem. However, the development for
improving the efficiency of the system is stilla challenging
field of reserch. PV system cannot be modelled as constant
DC current source because its output power is varied
depending o the load current, temprature and irradiation.
Generally, MPPT is adopted to track the maximum power
point in the PV system. The efficiency of MPPT depods on
both the MPPT control algorithm and the MPPT circuit. The
MPPT contol algorthim is usually applied in the DC-Dc
converter, which is normally used as the MPPT circuit.
One of the most popular algorithms of MPPT is P&O
(Petrub and Observe) technique however, the convergence
problem and oscillation are ocured at certain points during
the tracking. To enhance the performance of the P&O
algorithm, this paper prsents the application of Fuzzy Logic
Control (FLC) to nthe MPPT control. The simulation study
in this paper is done in MATLAB and simulink.
This paper prsents an intelligent control strategyof MPPT
for the PV system using the FLC. Simulation results show
that proposed MPPT can track the MPP fater when
compared to the conventional P&O method. In conclusion,
the proposed MPPT using fuzzy logic can improve the
performance of the system. For the future work, we intend to
implement the proposed technique in the real PV system.
B. Comparison of Photovoltaic Array Maximum Power
Point Tracking Techniques
Hairul Nissah Zainudin ,Saad Mekhilef proposes the
many different tecniques for maximum power point tracking
of photovoltaic array are discused. The techniques are taken
from the literature dating back to back to the earliestmethods.
It is shown that at least 19 distinct methods have been
introduced in the literature, with many variations on
implementations. This paper shold serve as convenient
refernce for future work in PV power generation.
4. 12 International Journal of Research in Science & Technology
A Study of SEPIC Converter Based Fuzzy Logic Controller For Hybrid System
Tracking the maximmum power point (MPP) of a
photovoltaic (PV) array is usually an essntial part of PV
system. As such, many MPP tracking (MPPT) methods have
been developed and implemented. The methods vary in
complexity, sensors required, convergence speed, cost, range
of effectiveness, implementation hatdware, populaity, and in
other respects.
They range from the almost obvious to the most creative.
In fact, so many methods have been developed that it has
become difficult adequately determine which method, newly
proposed or existing, is most appropriate for a given PV
system. Given the large number of methods for MPPT, a
survey of the methods would be very benfical to researchers
and practioners in PV system. The total number of MPPT
paper from our biblography per year since the earliest MPPT
paper we found. The number of papers per year has grown
considerably of the last decades and remains strong.
However, recent papers have generally had shorter, more
cursory literatue reviews that largly summarize or repeat what
seems to be conventional wisdom that there are only a
handfull of MPPT, when in fact there are many. This is due to
the sheer volume of MPPT literatue to review, conflicting
with the need for brevity.
Several MPPT techniques taken from the literature are
discussed and analysed herein, with their pros and cons. It is
shown that there are several other MPPT techniques than
those commonly included in literature reviews. The
concluding discussion and table should serve as a useful guide
in choosing the right MPPT method for specific PV systems.
C. Generalized Neural Network Approach for Global Solar
Energy Estimation In India
Rizwan, M. Jamil, M. Kothari, proposes the many
different tecniques for maximum power point tracking of
photovoltaic array are discused. The techniques are taken
from the literature dating back to back to the earliestmethods.
It is shown that at least 19 distinct methods have been
introduced in the literature, with many variations on
implementations. This paper shold serve as convenient
refernce for future work in PV power generation.
Tracking the maximmum power point (MPP) of a
photovoltaic (PV) array is usually an essntial part of PV
system. As such, many MPP tracking (MPPT) methods have
been developed and implemented. The methods vary in
complexity, sensors required, convergence speed, cost, range
of effectiveness, implementation hatdware, populaity, and in
other respects.
They range from the almost obvious to the most creative.
In fact, so many methods have been developed that it has
become difficult adequately determine which method, newly
proposed or existing, is most appropriate for a given PV
system. Given the large number of methods for MPPT, a
survey of the methods would be very benfical to researchers
and practioners in PV system. The total number of MPPT
paper from our biblography per year since the earliest MPPT
paper we found. The number of papers per year has grown
considerably of the last decades and remains strong.
However, recent papers have generally had shorter, more
cursory literatue reviews that largly summarize or repeat what
seems to be conventional wisdom that there are only a
handfull of MPPT, when in fact there are many. This is due to
the sheer volume of MPPT literatue to review, conflicting
with the need for brevity.
Several MPPT techniques taken from the literature are
discussed and analysed herein, with their pros and cons. It is
shown that there are several other MPPT techniques than
those commonly included in literature reviews. The
concluding discussion and table should serve as a useful guide
in choosing the right MPPT method for specific PV systems.
D. A New MPPT Method For Low-Power Solar Energy
Harvesting
Oscar López-Lapeña, Maria Teresa Penella, Manel
Gasulla, introduces this paper describes a new
maximum-power-point tracking (MPPT) method focused on
low-power (<1W) photovoltaic (PV) panels. The static and
dynamic performance is theoretically analysed, and design
criteria are provided. A prototype was implemented with a
500-mW PV panel, a commercial boost converter, and
low-power components for the MPPT controller. Laboratory
measurements were performed to assess the effectiveness of
the proposed method. Tracking efficiency was higher than
99.6%. The overall efficiency was higher than 92% for a PV
panel power higher than 100 mW. This is, in part, feasible due
to the low power consumption of the MPPT controller. The
time response of the tracking circuit was tested to be around 1
s. Field measurements showed energy gains higher than
10.3% with respect to a direct-coupled solution for an
ambient temperature of 26°
C higher gains are expected for
lower temperatures.
Low-power devices mainly use either primary or
secondary (rechargeable) batteries. Primary batteries are
cheaper and are suitable whenever they survive the life cycle
of the device. On the other hand, secondary batteries are used
in mobile devices that must often be recharged from the
mains, such as, for example, mobile phones. However, in
some devices, such as the nodes of wireless sensor networks
(WSNs), this solution is not practical. Energy harvesting
constitutes a feasible alternative and has been proposed in
order to power autonomous nodes using optical mechanical or
thermal energy or even a combination of them.
In order to extract the maximum power from a
photovoltaic (PV) panel, several
maximum-power-point-tracking (MPPT) methods have been
proposed and used for high-power systems. Their application
to low-power PV panels.
A new MPPT method that is suitable for low-power PV
panels has been proposed and tested. The MPPT controller is
used as an external control loop of a PFM dc/dc converter
placed between the PV panel and the load. In contrast to other
true MPPT controllers, such as the P&O method, the current
has not to be measured, and no multiplier operator has to be
used to calculate the power. Therefore, the control circuit is
simpler, and its consumption is lower than using those
conventional techniques. Consequently, high energy
efficiency can be achieved even for low-power sources. The
static and dynamic performance of the proposed MPPT
method has been theoretically analysed, and design criteria
have been provided. The static performance is assessed
through the power efficiency.
5. 13 International Journal of Research in Science & Technology
Volume: 2 | Issue: 1 | January 2015 | ISSN: 2349-0845IJRST
The analysis demonstrates that a high tracking accuracy
can be achieved even using low power comparators whenever
their propagation delays are matched or the charge cycle is
long enough. The dynamic performance is assessed by the
time response of the tracking voltage, which can be
approximated by a first-order linear function. A prototype
MPPT circuit has been implemented using a commercial PFM
dc/dc boost converter and low-power components for the
MPPT controller. Laboratory measurements have been
carried out using a custom PV array simulator in order to
assess the static and dynamic performance. The tracking
efficiency is higher than 99.6%. The overall efficiency is
higher than 92% for a PV panel power over 100 mW. This is,
in part, feasible due to the low power consumption of the
MPPT controller, which is kept lower than 350 μW. The time
response of the tracking circuit was tested to be around 1 s.
Field measurements have also been performed in order to
compare the proposed solution with a direct-coupled
circuit.Utilization of low-power indoor devices such as
remote sensors, supervisory and alarm systems, distributed
controls, and data transfer system is on steady rise. Due to
remote and distributed nature of these systems, it is attractive
to avoid using electrical wiring to supply power to them.
Primary batteries have been used for this application for many
years, but they require regular maintenance at usually hard to
access places.
E. Indoor Power Harvesting Using Photovoltaic Cells For
Low-Power Applications
Javanmard, N. ; Mazandaran Tel. Co., Sari, Iran
; Vafadar, G. ; Nasiri, A.This paper provides a complete
analysis of a photovoltaic (PV) harvesting system for indoor
low-power applications. The characteristics of a target load,
PV cell, and power conditioning circuit are discussed.
Different choices of energy storage are also explained.
Implementation and test results of the system are presented,
which highlights the practical issues and limitations of the
system. Designing a photovoltaic (PV) energy harvesting
system involves complex trade-offs due to the existence of
several factors such as the characteristics of the PV cells,
chemistry and capacity of the storage element used, power
supply requirements, energy levels and power management
features of the system, and nature of the application. For
every system, the ultimate goal is to maximize the energy
efficiency of the PV harvesting system. Each PV cell has an
optimal operating point at which the output power will be at
its maximum. The harvesting circuit should always ensure
operation at this maximum power point (MPP) or near to it,
which is typically performed by clamping the terminal
voltage of the cell to a fixed voltage. Energy harvesting
method exploiting PV cells provides high power density,
which makes it a desirable choice to power an embedded
system that consumes several mill watts of power using a
reasonably small harvesting unit.
The power densities of different energy harvesting
technologies per volume of total system. Harvesting nearby
natural sources of energy for supplying power in indoor
industrial and biomedical applications faces serious
challenges. The light intensity under artificial lighting
conditions found in hospitals and offices is much less than 10
W/m2 (6.830 klx) compared with 100–1000 W/m2
(68.3–683 klx) under outdoor conditions.
Utilization of indoor PV cells to harvest energy for low power
electronic devices has been discussed in this paper. First, the
nature of the load and its instantaneous and average power
Consumption was discussed. The tests performed on the
indoor PV cells at different light illumination levels were
described. Various energy storage options, including battery
and ultra-capacitors, were discussed, and different
architectures of the systems were described. The results of the
testing of various architectures were also provided. For the
system described in this paper, an integrated system of a
rechargeable battery and PV cell has been selected as a final
solution due to lower cost and higher reliability.
F. Fuzzy Controller Design Using Soft Switching Boost
Converter For MPPT In Hybrid System
T.Balamurugan and S.Manoharan are introduces in
this paper, a fuzzy logic control (FLC) is Proposed to control
the maximum power point tracking (MPPT) for a
photovoltaic (PV) system and to control the maximum power
point for a wind turbine (WT) system. Hybrid integrated
topology, fed by photovoltaic (PV) and wind turbine (WT)
sources and suitable for distributed generation applications,
It works as an uninterruptible power source that is able to
feed a certain minimum amount of power into the grid under
all conditions. PV is used as the primary source of power
operating near maximum power point (MPP), with the WT
section (block), acting as a current source, feeding only the
deficit power.
The unique “integrated” approach obviates the need for
dedicated communication between the two sources for
coordination and eliminates the use of a separate,
conventional dc/dc boost converter stage required for PV
power processing. The conventional boost converter
decreases the efficiency because of hard switching, which
generates losses when the switches are turned on/off. During
this interval, all switches in the adopted circuit perform
zero-current switching by the resonant inductor at turn-on,
and zero-voltage switching by the resonant capacitor at
turn-off. This switching pattern can reduce the switching
losses, voltage and current stress of the switching device.
A Fuzzy based Hybrid system improve the efficiency of
the energy conversion systems because of reducing the
switching losses The importance of renewable energy,
renewable energy based energy conversion systems, and
distributed power generation has been reiterated. The major
principle of MPPT is to extract the maximum available power
from PV panels by making them operating at the most
efficiency voltage
G. Fuzzy Logic MPPT Controller With Energy
Management System for Solar-Wind-Battery Diesel
Hybrid Power System
K.Sekar and V.Duraisamy proposes Effective utilization
of power is more important than generation of power because
power scarcity is the major problem at present in India. It
leads many industries to utilize the diesel generator results
pollution and demand to fossil fuel.So nowadays many
industries and government passions on renewable energy. A
wind solar hybrid power system plays a crucial role today in
6. 14 International Journal of Research in Science & Technology
A Study of SEPIC Converter Based Fuzzy Logic Controller For Hybrid System
renewable power resources because it uses solar energy
combined with wind energy to create a stand-alone energy
source that is both dependable and consistent. This paper
proposes effective energy management controller for solar
wind hybrid renewable power system for telecommunication
industries. In power systems apart from power generation
managing of power without wastage is imperative.
This paper proposes Fuzzy Logic Controller based
Effective Energy Management Controller to monitor the
power from all resources and load demand consistently and to
control whole hybrid power system. Fuzzy logic controller
makes accurate selection of sources in right timing. Fuzzy
Logic Maximum Power Point Tracking is proposed in this
paper for solar and wind power system to provide a constant
voltage with the help of DC-DC Single-Ended
Primary-Inductance Converter. Absence of
telecommunication devices per day is unimaginable in current
trend.
Main objective of this paper is to supply uninterruptible
power for telecommunication loads from standalone
solar-wind-Diesel hybrid power system with efficient energy
storage system. It provides uninterrupted power, effective
utilization of sources, improves life time of battery and
minimized usage of diesel. The wind and solar hybrid power
system is simulated using MATLAB.
Fuzzy Logic MPPT Control is applied for wind and solar
sources make the system efficient. Hybrid power system
supplies AC and DC load so it is suitable for all applications
like remote areas, villages and hill stations. Fuzzy logic based
Effective Energy Management Controller controls hybrid
power system to provide uninterrupted power, minimizing
usage of diesel, effective utilization of sources and improves
lifetime of battery. Since the usage of diesel generator is
minimized emission of harmful gases from it is minimized. So
it is a pollution free green energy system applicable to any
location and any country.
H. Fuzzy Logic Controller Based SEPIC Converter for
Maximum Power Point Tracking
Ahmad El Khateb, Nasrudin Abd Rahim, Jeyraj Selvaraj
and M. Nasir Uddin, proposes a fuzzy logic controller
(FLC)-based single-ended primary-inductor converter
(SEPIC) for maximum power point tracking (MPPT)
operation of a photovoltaic (PV) system. The FLC proposed
presents that the convergent distribution of the membership
function offers faster response than the symmetrically
distributed membership functions. The fuzzy controller for
the SEPIC MPPT scheme shows high precision in current
transition and keeps the voltage without any changes, in the
variable-load case, represented in small steady-state error and
small overshoot. The proposed scheme ensures optimal use of
PV array and proves its efficacy in variable load conditions,
unity, and lagging power factor at the inverter output (load)
side. The real-time implementation of the MPPT SEPIC
converter is done by a digital signal processor (DSP), i.e.,
TMS320F28335. The performance of the converter is tested
in both simulation and experiment at different operating
conditions. The performance of the proposed FLC-based
MPPT operation of SEPIC converter is compared to that of
the conventional proportional–integral (PI)-based SEPIC
converter. The results show that the proposed FLC-based
MPPT scheme for SEPIC can accurately track the reference
signal and transfer power around 4.8% more than the
conventional PI-based system.
An FLC-based MPPT scheme for the SEPIC converter
and inverter system for PV power applications has been
presented in this paper. A prototype SEPIC converter-based
PV inverter system has also been built in the laboratory. The
DSP board TMS320F28335 is used for real-time
implementation of the proposed FLC and MPPT control
algorithms. The performance of the proposed controller has
been found better than that of the conventional PI-based
converters. Furthermore, as compared to the conventional
multilevel inverter, experimental results indicated that the
proposed FLC scheme can provide a better THD level at the
inverter output. Thus, it reduces the cost of the inverter and
the associated complexity in control algorithms. Therefore,
the proposed FLC-based MPPT scheme for the SEPIC
converter could be a potential candidate for real-time PV
inverter applications under variable load conditions.
I. Literature Review on Solar MPPT Systems
Kumaresh.V, Mridul Malhotra, Ramakrishna N and
SaravanaPrabu.R use of electricity is increasing day by day.
The electricity finds its application in all the domains.
Converting solar energy into electrical energy is one of the
best ways to reduce fossil fuel consumption. Owing to the cost
and efficiency of the solar cells, it is not used in most of the
electrical applications. But the introduction of Maximum
Power Point Tracking (MPPT) algorithms has improved the
efficiency of the solar cells. The various MPPT algorithms are
discussed in the paper. The applications supported by these
MPPT algorithms are also.
It is noted that perturb and observe and incremental
conductance is superior to all other MPPT algorithms.
Though fuzzy and neural networks are developing in the
present days, the efficiency remains high in perturb and
observe and Incremental conductance methods. The
converters such as buck, boost, buck-boost, cuk converters
are being used in MPPT systems. PWM inverters are used for
grid interconnection and standalone AC loads. The selection
of converters is based on the load connected to the system.
The ripples in dc voltage and current also influence the
selection of converters. With the above mentioned converters
and MPPT algorithms, solar panels can be configured to feed
any kind of load. The vast development in improving
efficiency of MPPT algorithms can encourage domestic
generation of power using solar panels.
J. Hybrid Fuzzy Logic Controllers for Buck Converter
Behrouz Safarinejadian and Farzaneh Jafartabar said that
In order to control the output voltage of a Buck converter,
hybrid fuzzy logic controllers are investigated in this paper. A
fuzzy proportional-integral (PI) controller is proposed to
improve the performance of the converter instead of a
conventional digital PI controller too. The model of the power
system is developed using Sim Power System toolbox and the
control part is realized using Fuzzy Logic Toolbox in
MATLAB. Simulation results show the better performance
7. 15 International Journal of Research in Science & Technology
Volume: 2 | Issue: 1 | January 2015 | ISSN: 2349-0845IJRST
for buck with a fuzzy PI in comparison with conventional PI,
also less settling time and less steady state error with
two-level hybrid and fuzzy, PD+I respectively.
This paper has investigated fuzzy logic controllers for a
buck converter. The system performance has been
investigated in relation to the voltage regulation. First a
classical PI controller is designed. Then in order to have the
better performance three fuzzy logic controllers are proposed:
fuzzy PI, two-level fuzzy hybrid, fuzzy PD+I. These results
show that fuzzy PD+I is a proper controller when minimizing
the steady state error is the purpose and two-level fuzzy
hybrid is the appropriate control method when having the
lowest settling time is important.
V. CONCLUSION
This paper presents the study of hybrid system consisting of
wind and solar. These renewable energy sources are
integrated through a MI current source interface dc-dc
converter. These diverse micro energy resources can improve
the hybrid system performance. The power converter
proposed in this paper is designed at low cost to avoid
redundancy of components. The wind generator used in this
proposed hybrid system runs at a constant speed. The PV
array uses fuzzy logic control algorithm and a fuzzy logic
controller to capture the maximum power. In contrast to the
previous works, this paper has explored the wide performance
of the hybrid system with fuzzy controller and MI dc-dc
converter is proves that the control strategy proposed in this
paper is feasible while developing a hybrid system with CSI
MI dc-dc converter which can reduce its production costs.
REFERENCES
[1] PongaskorTakun, SomyotKaitwandidvilai and ChaiyanJettanasen
“Maximum power point tracking using Fuzzy Logic Control for
photovoltaic system” IMCS 2011, March,Hang Kong
[2] TrishanEsram Patrick L, Chapman “Comparison of photovoltaic array
maximum power point Tracking techniques” IEEE Transactions on
Energy Conversion 2007,june
[3] M.Rizwan,MajidJamil, and D.P.Kothari “Generalized Neural Network
Approach for Global Solar Energy Estimation in India” Sustainable
Energy, IEEE Transactions on (Volume:3 , Issue: 3 ) July 2012.
[4] Oscar López-Lapeña, Maria Teresa Penella, and ManelGasulla “A New
MPPT Method for Low-Power Solar Energy Harvesting”IEEE
Transactions on Industrial Electronics, Vol. 57, No. 9, September
2010.
[5] Nasiri, Milwaukee, Zabalawi, S.A, Mandic G “Indoor Power
Harvesting Using Photovoltaic Cells for Low-Power Applications”
Industrial Electronics, IEEE Transactions on (Volume:56 , Issue:
11 )09 October 2009.
[6] T.Balamurugan and S.Manoharan “Fuzzy Controller Design using Soft
Switching Boost Converter for MPPT in Hybrid System”International
Journal of Soft Computing and Engineering (IJSCE) Volume-2,
Issue-5, November 2012.
[7] K.Sekar and V.Duraisamy “Fuzzy Logic Mppt Controller With Energy
management System For Solar-Wind-Battery diesel Hybrid Power
System” Journal of Theoretical and Applied Information
Technology31st January 2014. Vol. 59 No.3.
[8] S.Merlin Joys Mary, S.RajeshBabu “Energy Management on Grid
Connected Hybrid Renewable Energy Sources using Fuzzy
Logic”International Journal of Advanced Research in Electrical,
Electronics and Instrumentation Engineering Vol. 3, Issue 4, April
2014.
[9] Saravanaselvan.D, Mohammed feroskhan.J, Umayal.V, and
Indumathi.M “Simulation Of fuzzy Logic Control Based MPPT
Technique For Photovoltaic System” International Conference on
Innovations in Engineering and Technology (ICCET’2014) Sept.
19-20, 2014 Penang (Malaysia).
[10] Maria van der Hoeven Executive Director “International Energy
Agency IEA Technology Roadmaps for Solar Electricity2014”
Editions29 September, 2014.
[11] HasanMahamudul, MekhilefSaad, and Metselaar Ibrahim Henk
“Photovoltaic System Modeling with Fuzzy Logic Based Maximum
Power Point Tracking Algorithm” International Journal of Photo
energy Volume 2013.
[12] BehrouzSafarinejadian and FarzanehJafartabar “Hybrid Fuzzy Logic
Controllers for Buck Converter” International Conference on Artificial
Intelligence and Image Processing (ICAIIP'2012) Oct. 6-7, 2012 Dubai
(UAE).
[13] Alexis Kwasinski, Member IEEE “Identification of Feasible
Topologies for Multiple-Input DC–DC Converters” IEEE Transactions
On Power electronics, vol. 24, no. 3, march 2009.
[14] Mehdi Hassani, SaadMekhilef, Aiguo Patrick Hu, Neville R. WatsonA
“Novel MPPT Algorithm for Load Protection Based on Output Sensing
Control”IEEE PEDS 2011, Singapore, 5 - 8 December 2011.
[15] Kumaresh.V, MridulMalhotra, Ramakrishna N and SaravanaPrabu.R
“Literature Review on Solar MPPT Systems”Advance in Electronic
and Electric Engineering.ISSN 2231-1297, Volume 4, Number 3
(2014), pp. 285-296.
[16] Chitra A., Rose Mary S. Palackal, Greeshma K. Viswanathan and
NirupamaNambiar “An Incremental Conductance Based Maximum
Power Point Tracking Algorithm for a Solar Photovoltaic
System”International Journal of Applied Engineering Research, ISSN
0973-4562, Vol. 8, No. 19 (2013).
[17] Santosh.B.R, Vinod Kumar and Sumathi.S“ Implementation of Perturb
& Observe and Fuzzy Logic Control MPPT of PV System Using SEPIC
Converter”IJISET - International Journal of Innovative Science,
Engineering & Technology, Vol. 1 Issue 4, June 2014.
Authors Profiles:
S.Balaganesh is currently pursuing M.E degree
under the specialization of Power Electronics &
Drives under the department of EEE from Loyola
Institute of Technology and
Science,Thovalai,Tamilnadu,India.
R.Perumal is currently working as an Assistant
Professor of PET Engineering college in the
department of Electrical and Electronics
Engineering. He computed M.E degree from College
of Engineering Guindy ,Tamilnadu ,India. His
research area interest includes Control Systems,
Instrumentations, Embedded systems.
T.S .Anusha is currently working as an Assistant
professor of PET Engineering College in the
department of Electrical and Electronics
Engineering. She computed M.E degree in SRR
Engineering College, Chennai ,Tamilnadu, India.
Her research area interest includes Multilevel
Inverter, Renewable Energy systems.
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