A new single phase nine level multilevel inverter is proposed. The input to the proposed nine level multilevel inverter is obtained from solar panel . The solar energy obtained from the solar panel is not constant and it varies with times. In order to maintain the constant voltage obtained from the solar panel the boost converter is used to maintain the constant output voltage using MPPT ( Perturb and observe algorithm) algorithm. Then the buck boost converter output voltage is stored in the battery bank. Finally the battery energy is connected to the 9 level inverter circuits. The harmonics in the inverter is eliminated by using the fuzzy logic controller. The gate pulse for the multilevel inverter is given by the fuzzy logic controller which in turn reduces the harmonics in the inverter. Then the inverter output is connected to the grid are some application.
Z - Source Multi Level Inverter Based PV Generation SystemIJERA Editor
In this paper a novel technique of Z-Source multilevel Inverter based PV Generation system is implemented and simulated using MATLAB-Simulink simulation software. The Photovoltaic cells are healthier option for converting solar energy into electricity. Due to high capital cost and low efficiency PV cells have not yet been a fully smart choice for electricity users. To enhance the performance of the system, Z-Source multi level inverter can be used in place of conventional Voltage Source Inverter (VSI) in Solar Power Generation System. The PV cell model is developed using circuit mathematical equations. The Z-Source multilevel inverter is modeled to realize boosted DC to AC conversion (inversion) with low THD. Outcome shows that the energy conversion efficiency of ZSMLI is a lot improved as compared to conventional voltage Source Inverter (VSI). By doing FFT analysis we can know the total THD.
High Proficiency Grid ConnectedPhotovoltaic Power Generation SystemIJRES Journal
Solar energy hasbecomepopular nowadays and desire for clean energy. Since the solar radiation on no occasion remains constant,it keeps on insecure throughout the day. The need of the hour is to distribute a constant voltage to the grid irrespective of the deviation in temperatures and solar insolation. The inverter is designed from a boost converter along with a line frequency. The voltage from the boost converter is fedto the grid through inverter. In this proposed method high efficiency can be achievedby using only one switch functioning at high frequency at a time. The converter uses IGBT and ultra-fast reverse recovery diode. The simulation and experiment results are verified using MATLAB/Simulink software.
Maximum Power Point Tracking Method for Single Phase Grid Connected PV System...Ali Mahmood
Ordinary technique fail to ensure successful tracking of the maximum power point under partial shading conditions (PSC). This performs in significant reduction in the power generated as well as the reliability of the photovoltaic energy production system. For the effective utilization of solar panel under partial shading condition (PSC), maximum power point tracking method (MPPT) is required.
Z - Source Multi Level Inverter Based PV Generation SystemIJERA Editor
In this paper a novel technique of Z-Source multilevel Inverter based PV Generation system is implemented and simulated using MATLAB-Simulink simulation software. The Photovoltaic cells are healthier option for converting solar energy into electricity. Due to high capital cost and low efficiency PV cells have not yet been a fully smart choice for electricity users. To enhance the performance of the system, Z-Source multi level inverter can be used in place of conventional Voltage Source Inverter (VSI) in Solar Power Generation System. The PV cell model is developed using circuit mathematical equations. The Z-Source multilevel inverter is modeled to realize boosted DC to AC conversion (inversion) with low THD. Outcome shows that the energy conversion efficiency of ZSMLI is a lot improved as compared to conventional voltage Source Inverter (VSI). By doing FFT analysis we can know the total THD.
High Proficiency Grid ConnectedPhotovoltaic Power Generation SystemIJRES Journal
Solar energy hasbecomepopular nowadays and desire for clean energy. Since the solar radiation on no occasion remains constant,it keeps on insecure throughout the day. The need of the hour is to distribute a constant voltage to the grid irrespective of the deviation in temperatures and solar insolation. The inverter is designed from a boost converter along with a line frequency. The voltage from the boost converter is fedto the grid through inverter. In this proposed method high efficiency can be achievedby using only one switch functioning at high frequency at a time. The converter uses IGBT and ultra-fast reverse recovery diode. The simulation and experiment results are verified using MATLAB/Simulink software.
Maximum Power Point Tracking Method for Single Phase Grid Connected PV System...Ali Mahmood
Ordinary technique fail to ensure successful tracking of the maximum power point under partial shading conditions (PSC). This performs in significant reduction in the power generated as well as the reliability of the photovoltaic energy production system. For the effective utilization of solar panel under partial shading condition (PSC), maximum power point tracking method (MPPT) is required.
In this paper a buck-boost dc-dc converter for pv application is proposed, which is mainly composed of a buck – boost converter, PV panel, load and a battery. Existing dc-dc converter can convert the power from the PV panel, but unfortunately the PV panel can only provide power when there is a high intensity of light. In order to provide power supply to the load without any interruption, buck-boost dc-dc converter is introduced. The power intermittency issue of PV panel can be overcome with the aid of a secondary supply which is in this case, the batter. The integration system between the primary and the secondary supply is controlled by a simple proposed control scheme. Battery act as a power in the low voltage side while PV panel is taking over in the high voltage side. Buck-boost converter is operated either is buck or boost mode according to the performance of the PV panel. This paper is presented the simple control scheme to decide the mode suitable for the buck and boost mode. Various conditions are simulated to verify the working operation of the buck-boost converter and to representing solar panel in real life. Simulation and experimental are carried out to verify the system.
Power system Projects, Power electronics projects, Control system projects,
MSR PROJECTS ( Now as a MSR EDUSOFT PVT LTD),
#503,Annapurna Block, beside mytrivanam, Adhithya Enclave, Ameerpet, HYD-38.
E-mail: msrprojectshyd@gmail.com,
Web: www.msrprojectshyd.com , facebook.com/msrprojects ,
Ring on: 040 66334142, +91 9581464142.
Branches: Hyderabad ( Ameerpet | Dilsuknagar) | Kurnool
Design and Development of Power Electronic Controller for Grid-connected PV A...IJAPEJOURNAL
Design and simulation of a simple power electronic interface for grid-connected PV array has been proposed using boost converter and line-commutated inverter with maximum power point tracking (MPPT) controller. The output of PV array varies with irradiation, and hence the duty cycle of the PI controller is adjusted automatically to supply a constant DC voltage to the inverter circuit, the output of which is directly connected to the grid. The MPPT controller extracts maximum power from the solar array and feeds it to the single-phase utility grid. The proposed scheme has been modeled in the MATLAB 7.1 software and the complete system has been simulated for open loop and closed loop configurations. The active power fed to the grid is taken for different firing angles in open loop mode and the firing angle for maximum power has been determined. This is compared with the firing angle obtained from the closed loop mode and found that both results agree with each other.
The battery energy storage systems are very essential for maintaining constant power supply when using solar photovoltaic systems for power generation. The viability and ability of battery energy storage systems are assessed based on battery usage in Solar Photovoltaic utility grid-connected systems. The power supply quality and reliability are improved by utilizing battery energy storage technologies in conjunction with solar photovoltaic systems. This paper presents a comparative analysis of Lead-Acid Storage battery and Lithium-ion battery banks connected to a utility grid. The battery mathematical model simulation study gives their performance characteristics of these batteries under grid-connected loads. Cost-benefit analysis of battery usage for determining the best battery suitable for solar photovoltaic system applications is also presented in this paper.
Design Of Charge Controller Using MPPT AlgorithmIJRES Journal
Recently non-conventional sources are in huge demand than the conventional sources of energy. Solar energy, though it is in great demand but it has low efficiency. So, to increase the efficiency of the system, we need to find the exact MPP. For this we employ a tracker called MPPT. The main aim will be to track the maximum power from the photovoltaic and feed the extracted power to the load via buck-boost converter. The purpose of this converter is to maintain the required voltage magnitude necessary for the load. In this paper, I have used P&O Algorithm to get the maximum power point and for efficiently designing the charge controller.
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
A Novel Approach on Photovoltaic Technologies for Power Injection in Grid Usi...IJERA Editor
The paper presents the simulation of the Solar Photovoltaic module using Matlab Simulink. This model is based on mathematical equations and is described through an equivalent circuit including a photocurrent source, a diode, a series resistor and a shunt resistor. This paper presents integration of the grid distribution network in Indian scenario with solar power technology to meet the additional electrical energy demand of urban as well as rural sectors which are both rapidly expanding. First of all the data of a real life power plant having 24V, 230W Power PV module has been compared and analyzed with that of matlab program output for identical module and it has been find out that a variation in temperature affects the parameters values as well as the performance of the solar module. After the above analysis the design and Simulink implementation for single phase power grid connected PV system has been done. The system includes the PV array model, the integration of the MPPT with boost dc converter , dc to ac inverter, single phase series load connected to ac grid. It is demonstrated that the model works well at different temperature conditions and predicting the General behavior of single-phase grid- connected PV systems .
Fuzzy logic based MPPT technique for a single phase Grid connected PV system ...THOKALA SOWMYA
In the proposed paper power generation from photovoltaic array is used to connect the grid. DFCM
Inverter control with PSPWM technique is used in order to control active and reactive power injected into grid. FLC
MPPT technique is proposed for maximum power point tracking and is compared with Constant voltage MPPT
technique. The simulation results of proposed system and Constant voltage MPPT technique are compared by using
MATLAB/SIMULINK software.
Performance of Photovoltaic Assisted Five Level Diode Clamped Inverter fed In...IJMTST Journal
This paper presents the simulation and analysis of Photovoltaic assisted three phase five level Diode Clamped multilevel inverter fed induction motor drive. Photovoltaic technology is one of the most promising for distributed low power generation. Its ability to produce power by directly converting solar energy has led to tremendous surge in its demand. The Photovoltaic output DC is fed to the boost converter to step up the voltage. The use of multilevel inverters have become popular in recent years for high power applications and an effective and practical solution for increasing power and reducing harmonics of AC waveforms. So, here a five level multilevel inverter is used for generating AC voltage from five levels of DC voltages and enhance the performance of the system. The proposed system is used to reduce the amplitudes of all harmonics at the output of the inverter. The power quality improves by reducing the harmonics level. The simulation results for the proposed system are verified using Mat lab / Simulink. The TOTAL HARMONIC DISTORTION (THD) for Diode Clamped multi-level inverter is compared with the three phase inverter and it can be observed that in the higher levels the THD is reduced.
Distributed energy resources (DER) based micro grid and Nano-grid framework is most technically viable bottom-top approach to sustainably meet ever-increasing demand of rural and urban communities. Recently the growth of DC operative home appliances like mobile and lap top chargers, ovens and hair dryer’s etc. are increasing and therefore a DC/DC converter is an efficient way to meet the electricity need from the local DER and helps in improving the system efficiency. This paper presents simulation results of a buck boost converter, MPPT algorithm (P & O method) for solar PV module and closed loop PI control system for obtaining constant 12 V and 24 V DC output voltage at DC bus. The proposed methodology is to extract maximum DC power from solar PV system and it is directly fed to DC load or DC Nano grid.
Hardware Implementation of Solar Based Boost to SEPIC Converter Fed Nine Leve...IJPEDS-IAES
Multi level inverters are widely used in high power applications because of
low harmonic distortion. This paper deals with the simulation
and implementation of PV based boost to SEPIC converter with multilevel
inverter. The output of PV system is stepped up using boost to sepic
converter and it is converted into AC using a multilevel inverter.
The simulation and experimental results with the R load is presented in this
paper. The FFT analysis is done and the THD values are compared. Boost to
SEPIC converter is proposed to step up the voltage to the required value. The
experimental results are compared with the simulation results. The results
indicate that nine level inverter system has better performance than seven
level inverter system.
The Investigation Of Utilizing Rapeseed Flowers Oil As A Reliable Feedstock T...IJERA Editor
The world demand for energy in recent decade has been dramatic. Indeed, several hydrocarbons reservoirs are depleted around the world. Moreover, the using of fossil fuels for example, natural gas and coal is emitted high quantities of carbon dioxide and other greenhouse gases to the environment that contributed in global worming phenomenon. Hence, many researchers and energy companies are attended and investigated to find out a new and reliable renewable energy source for example, biogas and biodiesel. Indeed, biodiesel can consider a reliable fuel due to many advantages for instance, reduce the global worming phenomenon, reduces carbon dioxide emissions and sustainable energy source. In fact, biodiesel can be produced from several resources for example, vegetable oil and animal fats. Rapeseed oil may consider a quite reliable and cheap source to produce biodiesel. Indeed, it has been observed that during the spring session in Iraqi Kurdistan region, wild rapeseed flowers are growing naturally in many cities of Iraqi Kurdistan for example, Sulaymaniyah, Ranya and Koya. The observed wild rapeseed flowers are produced considerable amounts of rape seed that can be invested to produced rapeseed oil and biodiesel. Therefore, this study is aimed to produce a reliable biodiesel from rapeseed flower oil by adopting transesterification reaction. Furthermore, this study has also applied process production parameters to find out the optimum operating conditions to produce biodiesel form the rapeseed oil for instance, amount of catalyst 1.25 % KOH and amount of methanol on biodiesel production yield about 7:1.Moreover, several laboratory tests for example, density, cloud point, pour point and cetane value have been applied for the produced biodiesel.
Bamboo Reinforced Concrete Truss Bridge for Rural InfrastructureIJERA Editor
Bamboo is one of a potential renewable construction material in the village. Bamboo is known to have a high mechanical strength in direction of the fibers. The weakness of bamboo in lateral direction of the fiber could be solved by constructing a composite structure with the concrete. The appropriate construction with hold the loads in axial direction is a truss structure. In a bamboo concrete truss structure, the bars are composed from the concrete column with a bamboo reinforcement. The research studies about the performance of the bridge and the effect of loading position on the strain and deformation of bamboo reinforced concrete truss bridge. The bridge whose span and width are respectively 1.5 m and 1.2 m was prepared. Load applied to the truss bridge conducted by using vehicle load changes with position. Mounting the strains gauge in bamboo reinforcement of primary truss is to observe the strain. The LVDT is used to observe the deflection of the truss bridge. The results show that the loading position influences the strain and deformation as well as a theoretical view.
In this paper a buck-boost dc-dc converter for pv application is proposed, which is mainly composed of a buck – boost converter, PV panel, load and a battery. Existing dc-dc converter can convert the power from the PV panel, but unfortunately the PV panel can only provide power when there is a high intensity of light. In order to provide power supply to the load without any interruption, buck-boost dc-dc converter is introduced. The power intermittency issue of PV panel can be overcome with the aid of a secondary supply which is in this case, the batter. The integration system between the primary and the secondary supply is controlled by a simple proposed control scheme. Battery act as a power in the low voltage side while PV panel is taking over in the high voltage side. Buck-boost converter is operated either is buck or boost mode according to the performance of the PV panel. This paper is presented the simple control scheme to decide the mode suitable for the buck and boost mode. Various conditions are simulated to verify the working operation of the buck-boost converter and to representing solar panel in real life. Simulation and experimental are carried out to verify the system.
Power system Projects, Power electronics projects, Control system projects,
MSR PROJECTS ( Now as a MSR EDUSOFT PVT LTD),
#503,Annapurna Block, beside mytrivanam, Adhithya Enclave, Ameerpet, HYD-38.
E-mail: msrprojectshyd@gmail.com,
Web: www.msrprojectshyd.com , facebook.com/msrprojects ,
Ring on: 040 66334142, +91 9581464142.
Branches: Hyderabad ( Ameerpet | Dilsuknagar) | Kurnool
Design and Development of Power Electronic Controller for Grid-connected PV A...IJAPEJOURNAL
Design and simulation of a simple power electronic interface for grid-connected PV array has been proposed using boost converter and line-commutated inverter with maximum power point tracking (MPPT) controller. The output of PV array varies with irradiation, and hence the duty cycle of the PI controller is adjusted automatically to supply a constant DC voltage to the inverter circuit, the output of which is directly connected to the grid. The MPPT controller extracts maximum power from the solar array and feeds it to the single-phase utility grid. The proposed scheme has been modeled in the MATLAB 7.1 software and the complete system has been simulated for open loop and closed loop configurations. The active power fed to the grid is taken for different firing angles in open loop mode and the firing angle for maximum power has been determined. This is compared with the firing angle obtained from the closed loop mode and found that both results agree with each other.
The battery energy storage systems are very essential for maintaining constant power supply when using solar photovoltaic systems for power generation. The viability and ability of battery energy storage systems are assessed based on battery usage in Solar Photovoltaic utility grid-connected systems. The power supply quality and reliability are improved by utilizing battery energy storage technologies in conjunction with solar photovoltaic systems. This paper presents a comparative analysis of Lead-Acid Storage battery and Lithium-ion battery banks connected to a utility grid. The battery mathematical model simulation study gives their performance characteristics of these batteries under grid-connected loads. Cost-benefit analysis of battery usage for determining the best battery suitable for solar photovoltaic system applications is also presented in this paper.
Design Of Charge Controller Using MPPT AlgorithmIJRES Journal
Recently non-conventional sources are in huge demand than the conventional sources of energy. Solar energy, though it is in great demand but it has low efficiency. So, to increase the efficiency of the system, we need to find the exact MPP. For this we employ a tracker called MPPT. The main aim will be to track the maximum power from the photovoltaic and feed the extracted power to the load via buck-boost converter. The purpose of this converter is to maintain the required voltage magnitude necessary for the load. In this paper, I have used P&O Algorithm to get the maximum power point and for efficiently designing the charge controller.
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
A Novel Approach on Photovoltaic Technologies for Power Injection in Grid Usi...IJERA Editor
The paper presents the simulation of the Solar Photovoltaic module using Matlab Simulink. This model is based on mathematical equations and is described through an equivalent circuit including a photocurrent source, a diode, a series resistor and a shunt resistor. This paper presents integration of the grid distribution network in Indian scenario with solar power technology to meet the additional electrical energy demand of urban as well as rural sectors which are both rapidly expanding. First of all the data of a real life power plant having 24V, 230W Power PV module has been compared and analyzed with that of matlab program output for identical module and it has been find out that a variation in temperature affects the parameters values as well as the performance of the solar module. After the above analysis the design and Simulink implementation for single phase power grid connected PV system has been done. The system includes the PV array model, the integration of the MPPT with boost dc converter , dc to ac inverter, single phase series load connected to ac grid. It is demonstrated that the model works well at different temperature conditions and predicting the General behavior of single-phase grid- connected PV systems .
Fuzzy logic based MPPT technique for a single phase Grid connected PV system ...THOKALA SOWMYA
In the proposed paper power generation from photovoltaic array is used to connect the grid. DFCM
Inverter control with PSPWM technique is used in order to control active and reactive power injected into grid. FLC
MPPT technique is proposed for maximum power point tracking and is compared with Constant voltage MPPT
technique. The simulation results of proposed system and Constant voltage MPPT technique are compared by using
MATLAB/SIMULINK software.
Performance of Photovoltaic Assisted Five Level Diode Clamped Inverter fed In...IJMTST Journal
This paper presents the simulation and analysis of Photovoltaic assisted three phase five level Diode Clamped multilevel inverter fed induction motor drive. Photovoltaic technology is one of the most promising for distributed low power generation. Its ability to produce power by directly converting solar energy has led to tremendous surge in its demand. The Photovoltaic output DC is fed to the boost converter to step up the voltage. The use of multilevel inverters have become popular in recent years for high power applications and an effective and practical solution for increasing power and reducing harmonics of AC waveforms. So, here a five level multilevel inverter is used for generating AC voltage from five levels of DC voltages and enhance the performance of the system. The proposed system is used to reduce the amplitudes of all harmonics at the output of the inverter. The power quality improves by reducing the harmonics level. The simulation results for the proposed system are verified using Mat lab / Simulink. The TOTAL HARMONIC DISTORTION (THD) for Diode Clamped multi-level inverter is compared with the three phase inverter and it can be observed that in the higher levels the THD is reduced.
Distributed energy resources (DER) based micro grid and Nano-grid framework is most technically viable bottom-top approach to sustainably meet ever-increasing demand of rural and urban communities. Recently the growth of DC operative home appliances like mobile and lap top chargers, ovens and hair dryer’s etc. are increasing and therefore a DC/DC converter is an efficient way to meet the electricity need from the local DER and helps in improving the system efficiency. This paper presents simulation results of a buck boost converter, MPPT algorithm (P & O method) for solar PV module and closed loop PI control system for obtaining constant 12 V and 24 V DC output voltage at DC bus. The proposed methodology is to extract maximum DC power from solar PV system and it is directly fed to DC load or DC Nano grid.
Hardware Implementation of Solar Based Boost to SEPIC Converter Fed Nine Leve...IJPEDS-IAES
Multi level inverters are widely used in high power applications because of
low harmonic distortion. This paper deals with the simulation
and implementation of PV based boost to SEPIC converter with multilevel
inverter. The output of PV system is stepped up using boost to sepic
converter and it is converted into AC using a multilevel inverter.
The simulation and experimental results with the R load is presented in this
paper. The FFT analysis is done and the THD values are compared. Boost to
SEPIC converter is proposed to step up the voltage to the required value. The
experimental results are compared with the simulation results. The results
indicate that nine level inverter system has better performance than seven
level inverter system.
The Investigation Of Utilizing Rapeseed Flowers Oil As A Reliable Feedstock T...IJERA Editor
The world demand for energy in recent decade has been dramatic. Indeed, several hydrocarbons reservoirs are depleted around the world. Moreover, the using of fossil fuels for example, natural gas and coal is emitted high quantities of carbon dioxide and other greenhouse gases to the environment that contributed in global worming phenomenon. Hence, many researchers and energy companies are attended and investigated to find out a new and reliable renewable energy source for example, biogas and biodiesel. Indeed, biodiesel can consider a reliable fuel due to many advantages for instance, reduce the global worming phenomenon, reduces carbon dioxide emissions and sustainable energy source. In fact, biodiesel can be produced from several resources for example, vegetable oil and animal fats. Rapeseed oil may consider a quite reliable and cheap source to produce biodiesel. Indeed, it has been observed that during the spring session in Iraqi Kurdistan region, wild rapeseed flowers are growing naturally in many cities of Iraqi Kurdistan for example, Sulaymaniyah, Ranya and Koya. The observed wild rapeseed flowers are produced considerable amounts of rape seed that can be invested to produced rapeseed oil and biodiesel. Therefore, this study is aimed to produce a reliable biodiesel from rapeseed flower oil by adopting transesterification reaction. Furthermore, this study has also applied process production parameters to find out the optimum operating conditions to produce biodiesel form the rapeseed oil for instance, amount of catalyst 1.25 % KOH and amount of methanol on biodiesel production yield about 7:1.Moreover, several laboratory tests for example, density, cloud point, pour point and cetane value have been applied for the produced biodiesel.
Bamboo Reinforced Concrete Truss Bridge for Rural InfrastructureIJERA Editor
Bamboo is one of a potential renewable construction material in the village. Bamboo is known to have a high mechanical strength in direction of the fibers. The weakness of bamboo in lateral direction of the fiber could be solved by constructing a composite structure with the concrete. The appropriate construction with hold the loads in axial direction is a truss structure. In a bamboo concrete truss structure, the bars are composed from the concrete column with a bamboo reinforcement. The research studies about the performance of the bridge and the effect of loading position on the strain and deformation of bamboo reinforced concrete truss bridge. The bridge whose span and width are respectively 1.5 m and 1.2 m was prepared. Load applied to the truss bridge conducted by using vehicle load changes with position. Mounting the strains gauge in bamboo reinforcement of primary truss is to observe the strain. The LVDT is used to observe the deflection of the truss bridge. The results show that the loading position influences the strain and deformation as well as a theoretical view.
Growth Processes for a pulse of leptin in fasting human subjectsIJERA Editor
A meal-like transient hyperinsulinemia and hyperglycemia, with a pulse of xamethasone, increased serum leptin levels from baseline by 54±21% at 9 h (P = 0.038). In the absence of transient hyperglycemia, leptin increased significantly after doses of both insulin and xamethasone. The effect of insulin was dose-dependent, with a larger increment of serum leptin at 9 h after the highest dose of insulin (75.2±15.7% vs 21.3±8.5%, P = 0.013). Fasting, with or without dexamethasone, resulted in a significant 20% decrease in leptin from morning basal levels. Conversely, the administration of a pulse of insulin and glucose, in the absence of dexamethasone, prevented the drop in serum leptin observed during fasting, regardless of the insulin dose or the serum glucose elevation. The permissive effect of dexamethasone, a single pulse of insulin triggered a rise in serum leptin in humans, even in the absence of transient hyperglycemia. A single pulse of insulin with glucose can prevent the drop in serum leptin normally observed during fasting. We also find the Growth Processes of Leptin
Cost Comparative Study On Steel Frame Folded Plate Roofing System Vs Conventi...IJERA Editor
Due to ever-increasing of construction materials, it becomes the foremost duty of a civil engineer to design economical and durable structures. In this project an attempt has been made to compare the cost of two types of roofing systems viz. conventional truss roofing system and steel frame folded plate roofing system. The steel frame folded plate roofing system, though found to be economical, is not widely practiced in India due to lack of knowledge regarding its analysis and design. On contrary to it, the conventional truss roofing system still remains as the widely adopted method of roofing for different types of buildings due to the available literature on its analysis, design and construction. The analysis and design of conventional truss roofing system and folded plate roofing system have been carried out for various spans. The analysis is carried out in STAAD.Pro 2004, which is based on stiffness method. Load calculations and design done manually, based on IS:875-1987, IS:800-1984 & SP:38(1987)
Maximum Power Point Tracking Using Adaptive Fuzzy Logic control for Photovolt...IJERA Editor
This work presents an intelligent approach to the improvement and optimization of control performance of a photovoltaic system with maximum power point tracking based on fuzzy logic control. This control was compared with the conventional control based on Perturb &Observe algorithm. The results obtained in Matlab/Simulink under different conditions show a marked improvement in the performance of fuzzy control MPPT of the PV system.
Modeling and Fluid Flow Analysis of Wavy Fin Based Automotive RadiatorIJERA Editor
In continuous technological development, an automotive industry has increased the demand for high efficiency engines. A high efficiency engines in not only based on its performance but also for better fuel economy and less emission rate. Radiator is one of the important parts of the internal combustion engine cooling system. The manufacturing cost of the radiator is 20 percent of the whole cost of the engine. So improving the performance and reducing cost of radiators are necessary research. For higher cooling capacity of radiator, addition of fins is one of the approaches to increase the cooling rate of the radiator. In addition, heat transfer fluids at air and fluid side such as water and ethylene glycol exhibit very low thermal conductivity. As a result there is a need for new and innovative heat transfer fluids, known as “Nano fluid” for improving heat transfer rate in an automotive radiator. Recently there have been considerable research findings highlighting superior heat transfer performances of nanofluids about 15-25% of heat transfer enhancement can be achieved by using types of nanofluids. With these specific characteristics, the size and weight of an automotive car radiator can be reduced without affecting its heat transfer performance. An automotive radiator (Wavy fin type) model is modeled on modeling software CATIA V5 and performance evaluation is done on pre-processing software ANSYS 14.0. The temperature and velocity distribution of coolant and air are analyzed by using Computational fluid dynamics environment software CFX. Results have shown that the rate of heat transfer is better when nano fluid (Si C + water) is used as coolant, than the conventional coolant.
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.
Filter Based Solar Power Generation System with a Seven Level InverterIJMTST Journal
This paper proposes a new solar power generation system, which is composed of a DC/DC power converter and a new seven-level inverter. The DC/DC power converter integrates a DC-DC boost converter and a transformer to convert the output voltage of the solar cell array into two independent voltage sources with multiple relationships. This new seven-level inverter is configured using a capacitor selection circuit and a full-bridge power converter, connected in cascade. The capacitor selection circuit converts the two output voltage sources of DC-DC power converter into a three-level DC voltage and the full- bridge power converter further converts this three- level DC voltage into a seven-level AC voltage. In this way, the proposed solar power generation system generates a sinusoidal output current that is in phase with the utility voltage and is fed into the utility. The salient features of the proposed seven-level inverter are that only six power electronic switches are used and only one power electronic switch is switched at high frequency at any time. A prototype is developed and tested to verify the performance of this proposed solar power generation system.
Modeling and Simulation of Solar Photovoltaic Systemijtsrd
Solar energy is a vital untapped resource in a tropical country like ours. The main hindrance for the penetration and reach of solar PV systems is their low efficiency and high capital cost. The efficiency of solar PV is very low. In order to increase the efficiency, Maximum Power Point Tracking (MPPT) techniques are to be undertaken to match the source and load property. These techniques are employed in PV systems to make full utilization of PV array output power. Recently, many MPPT algorithms of PV system have been proposed which depends on solar irradiation and temperature, but perturb and observe (P&O) and Incremental conductance algorithms are basic and most widely used. This project firstly introduces a Mat lab Simulink of photovoltaic array. To achieve the maximum power point tracking the Incremental Conductance method and perturb and observed (P&O) method are used. These two algorithms are employed with PV model along with converter in Mat lab Simulink. Three different converter boost, buck boost and cuk converter are design according to requirement and used. Few comparisons such as voltage, current and power output for each different combination have been recorded. Irfan Khan | Ameen Uddin Ahmad"Modeling and Simulation of Solar Photovoltaic System" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017, URL: http://www.ijtsrd.com/papers/ijtsrd5743.pdf http://www.ijtsrd.com/engineering/electrical-engineering/5743/modeling-and-simulation-of-solar--photovoltaic-system/irfan-khan
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
In this paper the multicarrier pulse width modulation (MCPWM) with multi value DC voltage source multilevel inverter is presented. These MLI’s are suitable in high voltage & high power application due to their ability to synthesize waveforms with better harmonic spectrum. Seven level inverter is simulated using MATLAB/Simulink. The use of Photovoltaic Cell as a DC source for the multilevel Inverter is proposed here.
Design an electric vehicle using PV array with five phase permanent magnet sy...ijtsrd
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Nine Level Inverter with Boost Converter from Renewable Energy Source
1. Maruthu Pandiyan.R et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp.27-36
www.ijera.com 27 | P a g e
Nine Level Inverter with Boost Converter from Renewable
Energy Source
Maruthu Pandiyan.R*
Student, ME Power Electronics and Drives,Sri Shakthi Institute of Engineering and Tech,Coimbatore-62 India.
Abstract –
A new single phase nine level multilevel inverter is proposed. The input to the proposed nine level multilevel
inverter is obtained from solar panel . The solar energy obtained from the solar panel is not constant and it
varies with times. In order to maintain the constant voltage obtained from the solar panel the boost converter is
used to maintain the constant output voltage using MPPT ( Perturb and observe algorithm) algorithm. Then the
buck boost converter output voltage is stored in the battery bank. Finally the battery energy is connected to the 9
level inverter circuits. The harmonics in the inverter is eliminated by using the fuzzy logic controller. The gate
pulse for the multilevel inverter is given by the fuzzy logic controller which in turn reduces the harmonics in
the inverter. Then the inverter output is connected to the grid are some application.
Keyword--- multilevel inverter, MPPT (Perturb and observe algorithm), fuzzy logic controller, Total
Harmonic Distortion (THD).
I. INTRODUCTION
The demand for renewable energy has increased
significantly over the years because of shortage of
fossil fuels and greenhouse effect. The definition of
renewable energy includes any type of energy
generated from natural resources that is infinite or
constantly renewed. Examples of renewable energy
include solar, wind, and hydro power. Renewable
energy, due to its free availability and its clean and
renewable character, ranks as the most promising
renewable energy resources like Solar energy, Wind
energy that could play a key role in solving the
worldwide energy crisis. Among various types of
renewable energy sources, solar energy and wind
energy have become very popular and demanding
due to advancement in power electronics techniques.
Photovoltaic (PV) sources are used today in many
applications as they have the advantages of effective
maintenance and pollution free. Solar electric energy
demand has grown consistently by 20% to 25% per
annum over the past 20 years, which is mainly due to
its costs and prices. This decline has been driven by
the following factors:
1)An increasing efficiency of solar cells,
2)Manufacturing technology improvements,
3)Economies of scale.
The focus of the Engineers is to make use of
abundantly available PV energy and so to design and
control an inverter suitable for photo voltaic
applications. Power electronic circuits with pulse
width modulation (PWM) are mostly used in energy
conversion systems to achieve closed loop control.
But even updated pulse width modulation (PWM)
techniques; do not produce perfect waveforms, which
strongly depend on the semiconductors switching
frequency. Also, it is well known that distorted
voltages and currents waveforms produce harmonic
contamination, additional power losses, and high
frequency noise that can affect not only the load
power but also the associated controller.
In recent years, multilevel inverters have become
more attractive for researchers and manufacturers due
to their advantages over conventional three level
PWM Inverters. They offer improved output
waveforms, smaller filter size and lower EMI, lower
Total Harmonic Distortion (THD).
The three common topologies for multilevel inverters
are as follows:
1) Diode clamped (neutral clamped),
2) Capacitor clamped (flying capacitors),
3) Cascaded H-bridge inverter.
The cascaded multilevel control method is very easy
when compared to other multilevel inverter because it
doesn’t require any clamping diode and flying
capacitor. The diode clamped inverter (neutral-point
clamped), capacitor-clamped (flying capacitor)
requiring only one dc source and the cascaded h-
bridge inverter requiring separate dc sources. The
latter characteristic, which is a drawback when a
single dc source is available, becomes a very
attractive feature in the case of PV
systems, because solar cells can be assembled in a
number of separate generators. In this way, they
satisfy the requirements of the CHB-MLI, obtaining
additional advantages such as a possible elimination
of the dc/dc buck booster (needed in order to adapt
voltage levels), a significant reduction of the power
RESEARCH ARTICLE OPEN ACCESS
2. Maruthu Pandiyan.R et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp.27-36
www.ijera.com 28 | P a g e
drops caused by sun darkening (usually, it influences
only a fraction of the overall PV field), and therefore
a potential increase of efficiency and reliability.
Performance of the multilevel inverter (such as
THD) is mainly decided by the modulation strategies.
For the cascaded multilevel inverter there are several
well known pulse width modulation strategies such
as space vector pwm, sinusoidal pwm, selective
harmonics elimination and multicarrier pwm.
Compared to the conventional method, the proposed
method is subjected to a new modulation scheme
adopting the sinusoidal pulse width modulation
technique which reduces the total harmonic
distortion.
II .OPERATING PRINCIPLE:
The proposed concept consists of the single
phase PV cell are connected to a H-Bridge Multilevel
Inverter using a boost converter. Maximum Power
Point Tracking (MPPT) is implemented in solar array
power system with direct control method. The
Perturb and Observe algorithm is used to track the
Maximum Power Point tracking, as it performs better
control under rapidly changing atmospheric
condition. Boost converter can step up the voltage
without using a transformer. In multilevel inverter
use of single dc sources with the 16 switches for
conventional H bridge inverter to get required nine
level output voltage and to reduce the harmonics. The
main disadvantage of conventional H bridge inverter
is input voltage is fixed to over this problem, in the
proposed prototype boost converter is used to
regulate and to obtain the desired input voltage and
further the DC source is replaced by a renewable
resource such as solar panels to get desired DC
voltage to grid connected system. In this paper there
will be inputs one is from PV array. 223V is taken
from PV cell and PV array and then they are boosted
to a voltage from 350V respectively by using boost
converter. Finally a nine -level output is observed by
giving the single supply voltages to the multilevel
inverter.
A. MODELLING OF SOLAR CELL
A solar cell is the building block of a solar
panel. A photovoltaic module is formed by
connecting many solar cells in series and parallel.
Considering only a single solar cell; it can be
modelled by utilizing a current source, a diode and
two resistors. This model is known as a single diode
model of solar cell shown in the figure 1. Two diode
models are also available but only single diode model
is considered here.
Fig.1 Circuit model of PV solar cell
The equation (2)that describe I-V characteristics of
the solar cell based on simple equivalent circuit
shown in Fig. 1, equations given below.
Where:
I- is the cell current (A).
q-is the charge of electron = 1.6x10-19coulmbs
K -is the Boltzman constant (j/K).
T -is the cell temperature (K).
IL- is the light generated current (A).
IO- is the diode saturation current.
Rs ,Rsh-are cell series and shunt resistance (ohms).
V-is the cell output voltage (V)
B.PV Characteristics
Current Vs Voltage Characteristics: Equation (1)
was used in computer simulation to obtain the output
characteristics of a solar cell, as shown in the Fig.2
Fig.2 P-V,I-V curve of a solar cell
B.EFFECT OF VARIATION OF SOLAR
IRRADIATION
The P-V and I-V curves of a solar cell are highly
dependent on the solar irradiation values. The solar
irradiation as a result of the environmental changes
keeps on fluctuating, but control mechanisms are
available that can track this change and can alter the
working of the solar cell to meet the required load
3. Maruthu Pandiyan.R et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp.27-36
www.ijera.com 29 | P a g e
demands. Higher is the solar irradiation, higher
would be the solar input to the solar cell and hence
power magnitude would increase for the same
voltage value shown in the fig 4. With increase in the
solar irradiation the open circuit voltage increases.
This is due to the fact that, when more sunlight
incidents on to the solar cell, the electrons are
supplied with higher excitation energy, thereby
increasing the electron mobility and thus more power
is generated.
Fig.4 Variation of P-V curve with solar irradiation
Fig.5 Variation of I-V curve with solar irradiation
C.EFFECT OF VARIATION OF
TEMPERATURE
On the contrary the temperature increase around
the solar cell has a negative impact on the power
generation capability. Increase in temperature is
accompanied by a decrease in the open circuit voltage
value shown in the fig.6. Increase in temperature
causes increase in the band gap of the material and
thus more energy is required to cross this barrier.
Thus the efficiency of the solar cell is reduced.
Fig.6 Variation of P-V curve with temperature
Fig.7 Variation of I-V with temperature
D.BOOST CONVERTER
Boost converter steps up the input voltage
magnitude to a required output voltage magnitude
without the use of a transformer. The main
components of a boost converter are an inductor, a
diode and a high frequency switch the boost
converter is shown in the fig 8. These in a co-
ordinated manner supply power to the load at a
voltage greater than the input voltage magnitude. The
control strategy lies in the manipulation of the duty
cycle of the switch which causes the voltage change.
Fig.8 Boost converter
E. MPPT Algorithm Method:
Tracking the maximum power point of a photovoltaic
array is usually an essential part of PV cell. As such
many MPP tracking methods have been developed
and implemented. The problem considered by MPPT
techniques is to automatically find the maximum
4. Maruthu Pandiyan.R et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp.27-36
www.ijera.com 30 | P a g e
power output PMpp under a given temperature and
irradiance
F. The MPPT methods are:
Perturb and Observe (P&O) method
This method is the most common. In this method
very less number of sensors are utilized .The
operating voltage is sampled and the algorithm
changes the operating voltage in the required
direction and samples 𝑑𝑃/𝑑𝑉. If 𝑑𝑃/𝑑𝑉 is positive,
then the algorithm increases the voltage value
towards the MPP until 𝑑𝑃/𝑑𝑉 is negative. This
iteration is continued until the algorithm finally
reaches the MPP. This algorithm is not suitable when
the variation in the solar irradiation is high. The
voltage never actually reaches an exact value but
perturbs around the maximum power point (MPP).
Fig.9 Flow chart of perturb & observe
III.MULTILEVEL INVERTER
The concept of multilevel converters has been
introduced since 1975. The period multilevel
originated with the three-level converter and
subsequently, some multilevel converter topologies
have been developed. The concept of a multilevel
converter is to achieve higher power in which a series
of power semiconductor switches with several lower
voltage dc sources are arranged to perform the power
conversion Capacitors, batteries and renewable
energy sources can be used as the multiple DC
voltage sources. A multilevel converter has several
advantages over conventional two-level converter
that uses high switching frequency Pulse Width
Modulation (PWM)
The input source PV and wind generator is used to
obtain maximum power point tracking from the solar
panel and wind generator generate the maximum
power give the charging battery fed at cascade
multilevel inverter. The output voltage waveform of a
multilevel inverter is composed of the number of
levels typically obtained from eleven levels. As the
number of levels reach infinity, the output Total
Harmonic Distortion (THD) approaches zero. Three
different major multilevel converter structures have
been applied in industrial applications: cascaded H-
bridges converter with separate dc sources, diode
clamped, and flying capacitors. The term multilevel
converter is utilized to refer to a power electronic
circuit that could operate in an inverter or rectifier
mode. Multilevel converters not only can generate the
output voltages with very low distortion, but also can
decrease the dv/dt stresses.
Thus Electro Magnetic Compatibility (EMC)
problems can be reduced. Multilevel inverters are
synthesizing a large number of levels have lot of
merits such as improved output waveform, a smaller
filter size, lower Electro Magnetic Interference
(EMI), and reduced harmonics. There are many
control techniques to reduce harmonics in output
voltage waveforms. Normally Pulse Width
Modulation (PWM) is widely employed to control
output of static power inverters. The reason for using
PWM is that they provide voltage and/or current
wave shaping customized to the specific needs of the
application under consideration. In this work,
maximum energy is obtained from the solar cell and
wind generator which is then given to a multilevel
inverter using PWM technique.
A .Cascade H-Bridge Multilevel Inverter:
Fig.10 Nine Level cascaded multilevel inverter
A single-phase structure of an m-level cascaded
inverter is illustrated in Fig.10. Each separate dc
source (SDCS) is connected to a single-phase full-
bridge, or H-bridge, inverter. Each inverter level can
generate three different voltage outputs, +Vdc , 0, and
–Vdc by connecting the dc source to the ac output by
different combinations of the fours
switchesS1,S2,S3,andSsSS4.
5. Maruthu Pandiyan.R et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp.27-36
www.ijera.com 31 | P a g e
Fig.11 Nine Level cascaded multilevel inverter output
voltage waveforms
To obtain +Vdc, switches S1 and S4 are turned on,
whereas –Vdc can be obtained by turning on switches
S2 and S1. By turning on S1, S2, S3, and S4, the output
voltage is 0. The ac outputs of each of the different
full-bridge inverter levels are connected in series
such that the synthesized voltage waveform is the
sum of the MLI outputs. The number of output phase
voltage levels m in a cascade inverter is defined by
m = 2s+1, where s is the number of single dc sources
.In the 9-level cascaded multilevel inverter with
single DC sources are obtained. The DC sources
feeding the multilevel inverter are considered to be
varying in time.
IV. SIMULATION MODEL
A. Simulation Model of PV System:
The solar cell was modeled in the single diode
format. This consists of a 0.1 ohm series resistance
and an 8 ohm parallel resistance shown in the fig 12.
This was modeled using the Sim Power System
blocks in the MATLAB library. The Simulink model
is as shown.
Fig.12 single Solar cell
The simplest model of a PV cell is shown in
simulation model Fig.13 Below that consists of an
ideal current source in parallel with an ideal diode.
The current source represents the generated by
photons, and its output is constant under constant
temperature and constant incident radiation of light.
Fig.13 Simulation model of PV cell
B. Output Voltage of the PV cell
There are two key parameters frequently used to
characterize a PV cell shorting together the terminals
of the cell, the photon generated current will flow out
of the cell as a short-circuit current(Isc) therefore,
Iph=ISC). When around is no connection to the PV
cell (open circuit) the photon generated current is
shunted internally by the intrinsic p-n junction diode.
This gives the open circuit voltage(V) It is seen that
the temperature changes affect mainly the PV output
current .The PV cell output voltage is a function of
the photocurrent that mainly determined by load
current depending on the solar irradiation level. The
output of the PV is shown in Fig.9. The PV output of
223V is obtained by adjusting the values of
temperature. The amount of power produced by the
PV system depend on the amount of PV radiation the
power output can be optimized by choosing a correct
system configuration corresponding to a given buck
boost converter.
Fig.14 Output Voltage Waveform of a PV Panel
C .Simulation Model of MPPT DC/DC Converter:
The simulation diagram of the MPPT DC/DC
converter is shown in the Fig.15. In case of MPPT
algorithms are necessary in PV applications because
the MPP of a solar panel varies with the irradiation
and temperature, thus the use of MPPT algorithms is
required in order to obtain the maximum power from
a solar array. The perturb and observe algorithm is
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used to track the MPPT, as it perform better control
under rapidly changing atmospheric condition. So
perturb and observe method is used in this proposed
method.
Fig.15 Simulation Model of MPPT DC/DC Converter
The output of the MPPT DC/DC converter is shown
in Fig.16. MPPT is used for solar installation system.
The output voltage varies with the input voltage. And
this MPPT good output regulation. This MPPT is
capable of improving the voltage level from 350
VDC to the required level.
Fig.16 Output Voltage Waveform of MPPT DC/DC
Converter
D. Simulation Model of 9-Level Cascaded H-
Bridge Multilevel Inverter:
The nine - level multilevel inverter has been
developed by using MAT LAB is shown in Fig.17 To
operate cascaded multilevel inverter using a solar
source. Considering a cascaded multilevel inverter
with four H-bridges and the nine level stepped output
voltage is obtained. Simulation model of nine level
cascade multilevel inverter modulation scheme are
pulse width modulation technique is obtained. It
consists of fuzzy logic used to determine the shape of
the output are obtained.
Fig..17 Simulation Model of 9-Level Cascaded H-Bridge
Multilevel Inverter
The Single Phase n -Cascaded H-Bridge Inverter for
PV applications, k dc generators and k cascaded H-
bridges arranged in a single phase multilevel inverter
topology. Each dc generator consists of PV cell
arrays connected in series and in parallel, thus
obtaining the desired output voltage and current. H
bridges basically consist of four metal oxide
semiconductor field effect transistors embedding an
anti parallel diode and a driver circuit. The number k
of H-bridges depends on the number n = 2k+1 of
desired levels, which has to be chosen by taking into
account both the available PV fields and design
considerations. Higher the number of levels the better
the sinusoidal output waveforms. However, the
number of level increases the complexity and the cost
of the system while reducing its switching frequency
in comparison with two level converters.
Since low voltage transistors (typically MOSFETs)
present significantly higher switching frequency than
high power transistors (typically IGBT), MLIs can
operate at significantly higher switching frequencies
than two level converters. This allows the use of
smaller low pass filters. Each H-bridge can be driven
by a square waveform with a suitable duty cycle or a
PWM pattern, thus resulting in a staircase without or
with PWM. In the considered single phase 230V
system, the cells are arranged into five distinct arrays,
thus resulting in an eleven level inverter, which can
be considered a reasonable trade-off among
complexity, performance, and cost.
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V.CASCADED H-BRIDGE MULTILEVEL
CONTROLLER
This paper shows the potential of a Single Phase
Cascaded H-bridge nine level inverter governed by
the fuzzy logic controller using photovoltaic power
source.
Fig.18 Block diagram of fuzzy logic controller
Fig.18 shows the block diagram of fuzzy logic
controller consists of one PV array, filter and the
load. This function is substituted by a reference
voltage generator imposing amplitude, frequency and
phase, thus implementing a PV control strategy.
Feedback signals are included in the FLC, whose
outputs applied to the MLI “Driver” block which
consists of a conditional statement functions
producing the discrete signals for gating the inverter
MOSFETs. The input variables to the FLC are as
follows:
1) Vn , i.e., the inverter output voltage measured after
a low-pass filter
2) The difference between the actual and reference
signals is AVdiff = Vout –Vref
Inverter output voltage measured after the
load terminals. This choice improves the quality of
the control without introducing delays. Filter
bandwidth is chosen around 1kHz with resistive load.
The output of the controller is applied to the inverter
gate drivers. The FLC output may assume nine
different states .The First step during the FLC design
was the creation of a knowledge base, i.e., fuzzy
rules, expressed in terms of statements, conditions,
and actions. Starting from the condition “TRUE”
(i.e., the situation is verified), a set of rules was
defined for the error conditions were defined
accordingly, obtaining variable reactions. The
number and type of membership functions (MFs)
represent a key point for the controller. Their shape
depends on the input data distribution and can
influence both the tracking accuracy and the
execution time.
Figs. 19 and 20 show the membership functions
chosen for the two input parameters. The labels
“NB,” “NS,” “ZE,” “PS,” and “PB” used for AV diff
stand as follows:
“NB”=negative−big,“NS”=negative−small, “ZE” =
zero, and so forth. The fuzzy sets for both the input
and output variables were nine, as the number of
levels ,ZE,I+,II+,III+,IV+,V+. A Mamdani-based
system architecture was realized; Max − Min,
composition technique, and the centre-of-gravity
method were used in the inference engine and in the
defuzzification process, respectively. In this paper,
the number and type of the control rules were decided
according to a sensitivity analysis made by varying
the number and type of rules.
Fig.19 Membership functions of parameter AVdiff
Fig.20 Membership functions of parameter Vn.
TABLE: 1
The following logic was adopted for designing the
inference rules:
1) If AVdiff is equal to ZE, the current state is
correct, and the inverter conserves its current state.
2) Consider a generic state ,if AV diff is positive
Vout > Vref, then the inverter state should be
reduced; if AVdiff is negative Vout < Vref, the
inverter state should be increased.
A.SINUSIODAL PULSE WIDTH
MODULATION TECHNIQUE:
PWM technique is extensively used for
eliminating harmful low-order harmonics in inverters.
In PWM control, the inverter switches are turned ON
and OFF several times during a half cycle and output
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voltage is controlled by varying the pulse width.
SPWM techniques are characterized by constant
amplitude pulses with different duty cycle for each
period. The width of this pulses are modulated to
obtain inverter output voltage control and to reduce
its harmonic content. Sinusoidal pulse width
modulation is the most commonly used method in
motor control and inverter application .In order to
verify the ability of the proposed multilevel inverter
topology to synthesize an output voltage with a
desired amplitude and better harmonic spectrum,
SPWM technique is applied to determine the required
switching angles. It has been proved that in order to
control the fundamental output voltage and eliminate
„n” harmonics, „n+1” equations are needed. Ideally,
for a given fundamental voltage V1, it is required to
determine the switching angles so that output voltage
Vo(wt)=V1sin(wt ) and a specific higher harmonics
of Vn(nwt) are equal to zero. According to the three
phase theory in balanced three phase system third
order harmonic is cancelled. One approach to solve
the set of nonlinear transcendental equations is to use
an iterative method such as the Newton-Raphson
method .In contrast to iterative methods, the approach
here is based on solving polynomial equations using
the theory of resultants which produces all possible
solutions. The transcendental equations
characterizing the harmonic content can be converted
into polynomial equations. Then the resultant method
is employed to find the solutions when they exist.
These sets of solutions have to be examined for its
corresponding total harmonic distortion (THD) in
order to select the set which generate the lowest
harmonic distortion.
VI.SIMULATION RESULTS:
In this paper, the simulation model is developed
in MATLAB/Simulink. Figs. 22 & 23 show the
closed loop configuration of nine -level inverter.
Filtered output voltage obtained from the eleven-level
inverter through RC low pass filter. Output voltage
feedback is given to the summer to compare the
output voltage with reference voltage and the error
voltage level obtained from the output of the summer
for further operation. There are two inputs to the
fuzzy logic controller one is error and derivative of
the error , derivative of the error obtained from the
previous sample value of the error voltage signal. The
role of fuzzy logic controller is to convert the given
crisp inputs to fuzzy sets using fuzzification, and then
process the fuzzy sets as per the fuzzy rules and
evaluation mechanism using fuzzy inference system.
Output of the inference system is fuzzy sets, which is
again converted to crisp output through
defuzzification process. This modulator output
compared with triangular wave to produce pulses to
the switches of nine-level inverter.
Fig.21 Output waveform of Nine Level Inverter without
filter
Fig.22 Output waveform of Nine Level Inverter with filter
Fig.23 FFT analysis for nine level inverter
The nine–level output voltage of the inverter before
filter and after the RC low pass filter.
Based on the harmonic analysis, total harmonic
distortion is less in the filtered output of the nine
level inverter. The FFT analysis shown fig 19 ,it is
observed that the total harmonic distortion is 1.89%
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Fig.24 over all Simulation
VII.CONCLUSION
In the paper ,a new single phase cascaded H-
Bridge Nine –level inverter with boost converter and
fuzzy logic controller using solar power source was
simulated using MATLAB/SIMULINK and
sinusoidal pulse width modulation control technique
was used to control this inverter. By tuning the fuzzy
logic controller required RMS voltage with less
harmonic distortion obtained in closed loop
configuration hence we could achieve the improved
efficiency of the system and better performance over
cascaded H-bridge seven level inverter.
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