Design a schematic to extract maximum obtainable solar power from a PV module and use the energy for a DC application. This project investigates in detail the concept of Maximum Power Point Tracking (MPPT) which significantly increases the efficiency of the solar photovoltaic system.
High efficiency push pull converter for photovoltaic applicationsEklavya Sharma
The object of this project is to design a high efficient DC-DC converter using Push-Pull topology.
A compact Dc-Dc converter with grid connection possibility and less switching losses.
This article proposes a topology for single-phase two stage grid connected solar photovoltaic (PV) inverter for residential applications. Our proposed grid-connected power converter consists of a switch mode DC-DC boost converter and a H-bridge inverter. The switching strategy of proposed inverter consists with a combination of sinusoidal pulse width modulation (SPWM) and square wave along with grid synchronization condition. The performance of the proposed inverter is simulated under grid-connected scenario via PSIM. Furthermore, the intelligent PV module system is implemented using a simple maximum power point tracking (MPPT) method utilizing power balance is also employed in order to increase the systems efficiency.
Dynamic modeling of microgrid for grid connected intentional islanding operat...Asoka Technologies
Microgrid is defined as the cluster of multiple distributed generators (DGs) such as renewable energy sources that supply electrical energy. The connection of microgrid is in parallel with the main grid. When microgrid is isolated from remainder of the utility system, it is said to be in intentional islanding mode. In this mode, DG inverter system operates in voltage control mode to provide constant voltage to the local load. During grid connected mode, the Microgrid operates in constant current control mode to supply preset power to the main grid. The main contribution of this paper is summarized as
1) Design of a network based control scheme for inverter based sources, which provides proper current control during grid connected mode and voltage control during islanding mode.
2) Development of an algorithm for intentional islanding detection and synchronization controller required during grid reconnection.
3) Dynamic modeling and simulation are conducted to show system behavior under proposed method using SIMULINK.
From the simulation results using Simulink dynamic models, it can be shown that these controllers provide the microgrid with a deterministic and reliable connection to the grid.
SALIENT FEATURES OF GRID-CONNECTED PHOTOVOLTAIC SYSTEM AND ITS IMPACT ON POWE...Editor IJMTER
Solar energy is available to the world for free of cost from millions of years and it is a
basic energy source to the mankind. It is also one of largest energy source to the mankind. PV
systems are a relative new technology. The operational experience with PV systems itself is at an
acceptable high level and today’s installed PV systems are of a good quality and are able to operate
without any problems for many years. The price level of the PV modules and the Balance of System
costs (inverter included) have decreased significantly. This energy is available all around the world
in large quantity. When this energy is collected by the solar PV cells it is in the small power with the
D.C. supply, which is not compatible with the existing grid in the world. There is an inverter and the
converter stage comes before this energy can used. Grid interactive PV systems can vary
substantially in size.
Design & Analysis of Grid Connected Photovoltaic SystemSulaman Muhammad
Aim of this project was to boost the DC voltage generated by the photovoltaic system to the required DC value through DC-DC boost converter and then to invert that DC voltage to AC voltage through H-bridge inverter. The output of the inverter is then filtered through a low pass filter to get a pure sinusoidal wave form. This output is then synchronized with the grid by converting the sine wave of grid into square wave and then compare that square wave with the PWM and then give that output wave of comparator to H-bridge, so if there is any change in the grid as a result the output of inverter will also have same change.
High efficiency push pull converter for photovoltaic applicationsEklavya Sharma
The object of this project is to design a high efficient DC-DC converter using Push-Pull topology.
A compact Dc-Dc converter with grid connection possibility and less switching losses.
This article proposes a topology for single-phase two stage grid connected solar photovoltaic (PV) inverter for residential applications. Our proposed grid-connected power converter consists of a switch mode DC-DC boost converter and a H-bridge inverter. The switching strategy of proposed inverter consists with a combination of sinusoidal pulse width modulation (SPWM) and square wave along with grid synchronization condition. The performance of the proposed inverter is simulated under grid-connected scenario via PSIM. Furthermore, the intelligent PV module system is implemented using a simple maximum power point tracking (MPPT) method utilizing power balance is also employed in order to increase the systems efficiency.
Dynamic modeling of microgrid for grid connected intentional islanding operat...Asoka Technologies
Microgrid is defined as the cluster of multiple distributed generators (DGs) such as renewable energy sources that supply electrical energy. The connection of microgrid is in parallel with the main grid. When microgrid is isolated from remainder of the utility system, it is said to be in intentional islanding mode. In this mode, DG inverter system operates in voltage control mode to provide constant voltage to the local load. During grid connected mode, the Microgrid operates in constant current control mode to supply preset power to the main grid. The main contribution of this paper is summarized as
1) Design of a network based control scheme for inverter based sources, which provides proper current control during grid connected mode and voltage control during islanding mode.
2) Development of an algorithm for intentional islanding detection and synchronization controller required during grid reconnection.
3) Dynamic modeling and simulation are conducted to show system behavior under proposed method using SIMULINK.
From the simulation results using Simulink dynamic models, it can be shown that these controllers provide the microgrid with a deterministic and reliable connection to the grid.
SALIENT FEATURES OF GRID-CONNECTED PHOTOVOLTAIC SYSTEM AND ITS IMPACT ON POWE...Editor IJMTER
Solar energy is available to the world for free of cost from millions of years and it is a
basic energy source to the mankind. It is also one of largest energy source to the mankind. PV
systems are a relative new technology. The operational experience with PV systems itself is at an
acceptable high level and today’s installed PV systems are of a good quality and are able to operate
without any problems for many years. The price level of the PV modules and the Balance of System
costs (inverter included) have decreased significantly. This energy is available all around the world
in large quantity. When this energy is collected by the solar PV cells it is in the small power with the
D.C. supply, which is not compatible with the existing grid in the world. There is an inverter and the
converter stage comes before this energy can used. Grid interactive PV systems can vary
substantially in size.
Design & Analysis of Grid Connected Photovoltaic SystemSulaman Muhammad
Aim of this project was to boost the DC voltage generated by the photovoltaic system to the required DC value through DC-DC boost converter and then to invert that DC voltage to AC voltage through H-bridge inverter. The output of the inverter is then filtered through a low pass filter to get a pure sinusoidal wave form. This output is then synchronized with the grid by converting the sine wave of grid into square wave and then compare that square wave with the PWM and then give that output wave of comparator to H-bridge, so if there is any change in the grid as a result the output of inverter will also have same change.
Now-a-days, power generation and utilization became more complicated which further affects the economy of a country. The available non-renewable energy sources that supply the demanded power do not consider environmental challenges like global warming and pollution. This leads to the development of power generation based on Renewable Energy Resources (RES). These RES are connected to the grid through power electronic converters which offer countless power quality issues that must be rectified to deliver a quality power to the end users. The proposed work uses a three phase Voltage Source Inverter (VSI) based Shunt Active Power Filter (SAPF) fed by solar Photo Voltaic (PV) system to eliminate current harmonics at the source side of the grid. The output of the PV system is given to a boost converter along with self–lift single-ended primary-inductor converter (SEPIC) for supplying high voltage gain which is accompanied by a Perturb & Observe Maximum Power Point Tracking (MPPT).The main objective of this paper is to eliminate the current harmonics at the grid side using SAPF. Also, the proposed SAPF is used for exporting the power generated from PV to the grid. The overall system performance is validated with a help of MATLAB/SIMULINK.
Dual Mode Control of Grid Connected Photovoltaic SystemRavindra Kuhada
As increased of PV system, High PV penetration issues are generated, so CPG is one method to limit the maximum power output from PV without need of extra cost and extra grid, and decrease the high PV penetration issues by modifying with the MPPT algorithm by perturb and observe method after that PV system connected to grid with unit template method.
This project is based on Construction and connection of photovoltaic module and related theories about it. To utilize maximum energy from the photovoltaic cell first of all understanding of it characteristics is very important because of this in starting of project we done proper study on characteristics of photo voltaic module and maximum power point. After got proper understanding of characteristics we try to use output of photo voltaic cell efficiently with help of Maximum power point tracker and cuk converter.
Operation and Control of Grid Connected Hybrid AC/DC Microgrid using Various RESIAES-IJPEDS
This paper proposes a Hybrid AC/DC Microgrid in alliance with Photo Voltaic (PV) energy, Wind Energy and Proton Exchange Membrane (PEM) Fuel cells. Microgrids are becoming increasingly attractive to the researchers because of the less greenhouse gases, low running cost, and flexibility to operate in connection with utility grid. The Hybrid AC/DC Microgrid constitutes independent AC and DC subgrids, where all the corresponding sources and loads are connected to their respective buses and these buses are interfaced using an interfacing converter. The Hybrid AC/DC Microgrid increases system efficiency by reducing the multiple reverse conversions involved in conventional RES integration to grid. A Small Hybrid AC/DC Microgrid in grid connected mode was modeled and simulated in MATLAB- SIMULINK environment. The simulation results prove the stable operation considering the uncertainty of generations and loads.
Dc-Dc boost converter topologies and MPPT techniques for Grid connected PV sy...rameshwar meena
1. Modeling of Dc-Dc boost converter in MATLAB Simulink.
2. MATLAB Simulink of P&O techniques and Incremental conductance.
3. Ac grid connected to solar PV array via dc-dc boost converter and Dc-Ac converter.
Coupled Inductor Based High Step-Up DC-DC Converter for Multi Input PV SystemIJERA Editor
With the shortage of the energy and ever increasing of the oil price, research on the renewable and green energy
sources, especially the solar arrays and the fuel cells, becomes more and more important. How to achieve high
step-up and high efficiency DC/DC converters is the major consideration in the renewable power applications
due to the low voltage of PV arrays and fuel cells. In this paper a coupled inductor dc-dc converter for photovoltaic
system is proposed. The circuit configuration of the proposed converter is very simple. Thus, the
proposed converter has higher step-up and step-down voltage gains than the conventional bidirectional dc–dc
boost/buck converter. Under same electric specifications for the proposed converter and the conventional
bidirectional boost/buck converter, the average value of the switch current in the proposed converter is less than
the conventional bidirectional boost/buck converter. The operating principles have been applied to multi input
photovoltaic system and outputs have been observed.
ICPCCI19_CPG-UVT BASED GRID CONNECTED PV SYSTEMRavindra Kuhada
This upload contains grid connected PV system with unit vector template method which is used to control PV inverter. A control strategy, constant power generation is used to control the power of the PV system with a dc-dc converter while high PV genetration is being issued. Therefore, PV penetration is limited
with CPG control technique without using any extra requirement e.g. extra grid or battery storage. With the MATLAB/SIMULINK, Simulation is carried out for a grid-connected PV system by constant power generation (active power control) and unit vector template method is used as an inverter control technique for grid synchronizing.
A simplified phase shift pwm-based feedforward distributed mppt method for gr...Asoka Technologies
The modularity and decreased filter size properties have made cascaded multilevel inverters (MLIs) more applicable than conventional two-level inverters, especially in high and medium power photovoltaic (PV) applications. However, partial shading of PV modules will affect negatively the output power of the unshaded modules. There are several existing solutions in the literature to address this challenge, however almost all of them suffer from complex implementations, low efficiency, and high cost. This paper presents a new simplified feedforward distributed maximum power point tracking (MPPT) method for three-phase grid-connected cascaded MLIs. The cascaded MLI provides a modular, and highly efficient single stage power conversion for PV systems. The proposed distributed MPPT method is depending on the phase-shift pulse width modulation (PSPWM) method with a simplified implementation. The proposed method is developing a feedforward signal that is proportional to the maximum power of the individual module. Then, the current controller, and the modulating signal are multiplied with the proportionality factor of the module maximum power. Furthermore, a modified modulation compensation method without using proportional-integral (PI) controllers is introduced to solve the problem of the unbalanced three-phase PV output currents that results from PV power mismatches and shading. A case study is implemented for 15 kW PV system to investigate the performance of the proposed method. In addition, comprehensive comparisons with the previous attempts in the literature are provided to verify the superior performance of the new proposed control method.
Simulation and analysis of perturb and observe mppt algorithm for array using...Asoka Technologies
This paper presents the comparative analysis between constant duty cycle and Perturb & Observe (P&O) algorithm for extracting the power from Photovoltaic Array (PVA). Because of nonlinear characteristics of PV cell, the maximum power can be extract under particular voltage condition. Therefore, Maximum Power Point Tracking (MPPT) algorithms are used in PVA to maximize the output power. In this paper the MPPT algorithm is implemented using Ćuk converter. The dynamics of PVA is simulated at different solar irradiance and cell temperature. The P&O MPPT technique is a direct control method enables ease to implement and less complexity.
Droop control method for parallel dc converters used in standalone pv wind po...eSAT Journals
Abstract The rising rate of consumption and price of fossil fuel along with environmental pollution by conventional power generation draw global attention to renewable energy sources and technology. Paper gives analysis study on current sharing issues of parallel DC converters in standalone photovoltaic (PV) WIND system. Solar wind power generating system with maximum power point tracking (MPPT) technique – incremental conductance method is used for the simulation analysis. The main drawbacks of parallel converters used in system are poor power sharing and voltage drop. The paper describes about instantaneous droop calculation considering effect of cable resistance using droop index to improve the power sharing performance. The control technique is simulated using MATLAB/SIMULINK in PV- wind power generating system with MPPT and case study has been done on the control strategy and verifies the effectiveness of adaptive droop control on output converter voltage. Key Words: Microgrid; droop method; incremental conductance (Incond); maximum power point tracking (MPPT).
Grid Connected Solar Photovoltaic Array with MPPT Matlab Simulationijtsrd
Now a days, due to the problem of generation of electricity and consumption required is not sufficient so, solar generation system is essential. Nowadays, with generates electricity to match the required demand. So this paper is important. Here using, 1 Soltech 1STH 215 P solar panel in SIMULINK. In this paper we are control the renewable energy based solar photovoltaic system using MATLAB. The grid connected MATLAB model is studied under solar radiation and changing weather condition. In this we generate excess amount of electricity and send to the utility grid. Here we used MPPT technique which is implemented in DC DC step up converter to permit P V module to give power at maximum power point. The output of this converter is given to the 3 level inverter and it synchronized the utility grid. Payal Ganvir | Radharaman Shaha ""Grid Connected Solar Photovoltaic Array with MPPT Matlab Simulation"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23832.pdf
Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/23832/grid-connected-solar-photovoltaic-array-with-mppt-matlab-simulation/payal-ganvir
Planning and Designing a Stand Alone Solar Power System for Multi-Building Or...IJMER
The purpose of this project is to discover ways to produce energy with alternate sources. This presents current status, major achievements and future aspects of solar energy in India and evaluation of current energy policies for conquering the obstructions and implementing solar for the future is also been presented. Solar energy is expected to play a very significant role in the future especially in developing countries, but it has also potential prospects for developed countries. Solar radiation is an integral part of different renewable energy resources like PV power, solar thermal power, solar heater etc.
This consists of Study of the Solar cell, Solar Photovoltaic Technology, Planning and Designing a Stand Alone Solar Power System for Multi Building in an Organization where Solar energy plays an important role for the power supply in case of emergency by replacing Diesel Generator set i.e. DG Set.
This gives a detail planning and designing of solar power system of 80KW demand per hour for Al-Falah School of engineering and technology, Brown hills college of engineering and technology, central canteen, masjid, Hostel as well as Al-Falah School of Training and Education.
Now-a-days, power generation and utilization became more complicated which further affects the economy of a country. The available non-renewable energy sources that supply the demanded power do not consider environmental challenges like global warming and pollution. This leads to the development of power generation based on Renewable Energy Resources (RES). These RES are connected to the grid through power electronic converters which offer countless power quality issues that must be rectified to deliver a quality power to the end users. The proposed work uses a three phase Voltage Source Inverter (VSI) based Shunt Active Power Filter (SAPF) fed by solar Photo Voltaic (PV) system to eliminate current harmonics at the source side of the grid. The output of the PV system is given to a boost converter along with self–lift single-ended primary-inductor converter (SEPIC) for supplying high voltage gain which is accompanied by a Perturb & Observe Maximum Power Point Tracking (MPPT).The main objective of this paper is to eliminate the current harmonics at the grid side using SAPF. Also, the proposed SAPF is used for exporting the power generated from PV to the grid. The overall system performance is validated with a help of MATLAB/SIMULINK.
Dual Mode Control of Grid Connected Photovoltaic SystemRavindra Kuhada
As increased of PV system, High PV penetration issues are generated, so CPG is one method to limit the maximum power output from PV without need of extra cost and extra grid, and decrease the high PV penetration issues by modifying with the MPPT algorithm by perturb and observe method after that PV system connected to grid with unit template method.
This project is based on Construction and connection of photovoltaic module and related theories about it. To utilize maximum energy from the photovoltaic cell first of all understanding of it characteristics is very important because of this in starting of project we done proper study on characteristics of photo voltaic module and maximum power point. After got proper understanding of characteristics we try to use output of photo voltaic cell efficiently with help of Maximum power point tracker and cuk converter.
Operation and Control of Grid Connected Hybrid AC/DC Microgrid using Various RESIAES-IJPEDS
This paper proposes a Hybrid AC/DC Microgrid in alliance with Photo Voltaic (PV) energy, Wind Energy and Proton Exchange Membrane (PEM) Fuel cells. Microgrids are becoming increasingly attractive to the researchers because of the less greenhouse gases, low running cost, and flexibility to operate in connection with utility grid. The Hybrid AC/DC Microgrid constitutes independent AC and DC subgrids, where all the corresponding sources and loads are connected to their respective buses and these buses are interfaced using an interfacing converter. The Hybrid AC/DC Microgrid increases system efficiency by reducing the multiple reverse conversions involved in conventional RES integration to grid. A Small Hybrid AC/DC Microgrid in grid connected mode was modeled and simulated in MATLAB- SIMULINK environment. The simulation results prove the stable operation considering the uncertainty of generations and loads.
Dc-Dc boost converter topologies and MPPT techniques for Grid connected PV sy...rameshwar meena
1. Modeling of Dc-Dc boost converter in MATLAB Simulink.
2. MATLAB Simulink of P&O techniques and Incremental conductance.
3. Ac grid connected to solar PV array via dc-dc boost converter and Dc-Ac converter.
Coupled Inductor Based High Step-Up DC-DC Converter for Multi Input PV SystemIJERA Editor
With the shortage of the energy and ever increasing of the oil price, research on the renewable and green energy
sources, especially the solar arrays and the fuel cells, becomes more and more important. How to achieve high
step-up and high efficiency DC/DC converters is the major consideration in the renewable power applications
due to the low voltage of PV arrays and fuel cells. In this paper a coupled inductor dc-dc converter for photovoltaic
system is proposed. The circuit configuration of the proposed converter is very simple. Thus, the
proposed converter has higher step-up and step-down voltage gains than the conventional bidirectional dc–dc
boost/buck converter. Under same electric specifications for the proposed converter and the conventional
bidirectional boost/buck converter, the average value of the switch current in the proposed converter is less than
the conventional bidirectional boost/buck converter. The operating principles have been applied to multi input
photovoltaic system and outputs have been observed.
ICPCCI19_CPG-UVT BASED GRID CONNECTED PV SYSTEMRavindra Kuhada
This upload contains grid connected PV system with unit vector template method which is used to control PV inverter. A control strategy, constant power generation is used to control the power of the PV system with a dc-dc converter while high PV genetration is being issued. Therefore, PV penetration is limited
with CPG control technique without using any extra requirement e.g. extra grid or battery storage. With the MATLAB/SIMULINK, Simulation is carried out for a grid-connected PV system by constant power generation (active power control) and unit vector template method is used as an inverter control technique for grid synchronizing.
A simplified phase shift pwm-based feedforward distributed mppt method for gr...Asoka Technologies
The modularity and decreased filter size properties have made cascaded multilevel inverters (MLIs) more applicable than conventional two-level inverters, especially in high and medium power photovoltaic (PV) applications. However, partial shading of PV modules will affect negatively the output power of the unshaded modules. There are several existing solutions in the literature to address this challenge, however almost all of them suffer from complex implementations, low efficiency, and high cost. This paper presents a new simplified feedforward distributed maximum power point tracking (MPPT) method for three-phase grid-connected cascaded MLIs. The cascaded MLI provides a modular, and highly efficient single stage power conversion for PV systems. The proposed distributed MPPT method is depending on the phase-shift pulse width modulation (PSPWM) method with a simplified implementation. The proposed method is developing a feedforward signal that is proportional to the maximum power of the individual module. Then, the current controller, and the modulating signal are multiplied with the proportionality factor of the module maximum power. Furthermore, a modified modulation compensation method without using proportional-integral (PI) controllers is introduced to solve the problem of the unbalanced three-phase PV output currents that results from PV power mismatches and shading. A case study is implemented for 15 kW PV system to investigate the performance of the proposed method. In addition, comprehensive comparisons with the previous attempts in the literature are provided to verify the superior performance of the new proposed control method.
Simulation and analysis of perturb and observe mppt algorithm for array using...Asoka Technologies
This paper presents the comparative analysis between constant duty cycle and Perturb & Observe (P&O) algorithm for extracting the power from Photovoltaic Array (PVA). Because of nonlinear characteristics of PV cell, the maximum power can be extract under particular voltage condition. Therefore, Maximum Power Point Tracking (MPPT) algorithms are used in PVA to maximize the output power. In this paper the MPPT algorithm is implemented using Ćuk converter. The dynamics of PVA is simulated at different solar irradiance and cell temperature. The P&O MPPT technique is a direct control method enables ease to implement and less complexity.
Droop control method for parallel dc converters used in standalone pv wind po...eSAT Journals
Abstract The rising rate of consumption and price of fossil fuel along with environmental pollution by conventional power generation draw global attention to renewable energy sources and technology. Paper gives analysis study on current sharing issues of parallel DC converters in standalone photovoltaic (PV) WIND system. Solar wind power generating system with maximum power point tracking (MPPT) technique – incremental conductance method is used for the simulation analysis. The main drawbacks of parallel converters used in system are poor power sharing and voltage drop. The paper describes about instantaneous droop calculation considering effect of cable resistance using droop index to improve the power sharing performance. The control technique is simulated using MATLAB/SIMULINK in PV- wind power generating system with MPPT and case study has been done on the control strategy and verifies the effectiveness of adaptive droop control on output converter voltage. Key Words: Microgrid; droop method; incremental conductance (Incond); maximum power point tracking (MPPT).
Grid Connected Solar Photovoltaic Array with MPPT Matlab Simulationijtsrd
Now a days, due to the problem of generation of electricity and consumption required is not sufficient so, solar generation system is essential. Nowadays, with generates electricity to match the required demand. So this paper is important. Here using, 1 Soltech 1STH 215 P solar panel in SIMULINK. In this paper we are control the renewable energy based solar photovoltaic system using MATLAB. The grid connected MATLAB model is studied under solar radiation and changing weather condition. In this we generate excess amount of electricity and send to the utility grid. Here we used MPPT technique which is implemented in DC DC step up converter to permit P V module to give power at maximum power point. The output of this converter is given to the 3 level inverter and it synchronized the utility grid. Payal Ganvir | Radharaman Shaha ""Grid Connected Solar Photovoltaic Array with MPPT Matlab Simulation"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23832.pdf
Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/23832/grid-connected-solar-photovoltaic-array-with-mppt-matlab-simulation/payal-ganvir
Planning and Designing a Stand Alone Solar Power System for Multi-Building Or...IJMER
The purpose of this project is to discover ways to produce energy with alternate sources. This presents current status, major achievements and future aspects of solar energy in India and evaluation of current energy policies for conquering the obstructions and implementing solar for the future is also been presented. Solar energy is expected to play a very significant role in the future especially in developing countries, but it has also potential prospects for developed countries. Solar radiation is an integral part of different renewable energy resources like PV power, solar thermal power, solar heater etc.
This consists of Study of the Solar cell, Solar Photovoltaic Technology, Planning and Designing a Stand Alone Solar Power System for Multi Building in an Organization where Solar energy plays an important role for the power supply in case of emergency by replacing Diesel Generator set i.e. DG Set.
This gives a detail planning and designing of solar power system of 80KW demand per hour for Al-Falah School of engineering and technology, Brown hills college of engineering and technology, central canteen, masjid, Hostel as well as Al-Falah School of Training and Education.
This presentation was prepared for the Board of Directors of Baran Group an engineering company, during summer of 2015. The proposal was not accepted for a variety of unrelated non-technical reasons (it is uploaded as is for the record).
Seminar report on Flexible Photovoltaic TechnologyKumudGarg3
This report is relate to topic of Flexible Solar Cell. In this report you get content is introduction, introduction to flexible solar cell, types of solar cell, types of flexible solar cell, application n etc.
Self Electricity Generation and Energy Saving By Solar Using Programmable Sys...theijes
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The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
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The International Journal of Engineering & Science would take much care in making your article published without much delay with your kind cooperation.
The concept of injecting photovoltaic power into the utility grid has earned widespread acceptance in these days of renewable energy generation & distribution. Grid-connected inverters have evolved significantly with high diversity. Efficiency, size, weight, reliability etc. have all improved significantly with the development of modern and innovative inverter configurations and these factors have influenced the cost of producing inverters. This paper presents a literature review of the recent technological developments and trends in the Grid-Connected Photovoltaic Systems (GCPVS). In countries with high penetration of Distributed Generation (DG) resources, GCPVS have been shown to cause unwanted stress on the electrical grid. A review of the existing and future standards that addresses the technical challenges associated with the growing number of GCPVS is presented. Maximum Power Point Tracking (MPPT), Solar Tracking (ST) and the use of transform-less inverters can all lead to high efficiency gains of Photovoltaic (PV) systems while ensuring minimal interference with the grid. Inverters that support ancillary services like reactive power control, frequency regulation and energy storage are critical for mitigating the challenges caused by the growing adoption of GCPVS. Anjali | Gourav Sharma"A Review on Grid-Connected PV System" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-4 , June 2017, URL: http://www.ijtsrd.com/papers/ijtsrd2195.pdf http://www.ijtsrd.com/engineering/electrical-engineering/2195/a-review-on-grid-connected-pv-system/anjali
PROTECTION OF ELECTRICAL EQUIPMENT USING 3D THERMOGRAPHY AND IMAGE PROCESSINGEklavya Sharma
This paper revolves around a thermal imaging technology that enhance the perception and awareness towards the objects we see around us. Here, we are using this technology for the protection and defect detections of electrical power equipment. Starting from the origin of infrared we will go through the development and research on thermography. Then, it is followed by the real-time 3 dimensional thermography using Matlab and thermal imaging camera. Then the systematic procedures for the temperature measurement thereby detecting the faults in the electrical power equipment using 3D thermography. And then taking the corrective action by guiding the automation software’s according to the temperature signatures of the devices. In addition, this paper presents the outline of the previous researches related to the project.
SMART HOME AUTOMATION USING MOBILE APPLICATIONEklavya Sharma
Our smart home automation kit provides smartphone application based solutions for control &
energy optimization in industry, commercial buildings & homes. The kit requires a Arduino
Uno R3 having ATMega328 microcontroller for processing, Bluetooth module HC-06 is
required to transmit and receive data, relays are required to control the AC loads, ULN2003 IC
is used to drive the relays, an Android smartphone with the Smart Home Automation
application installed is required to control the AC loads fixed in the switch board and a power
supply of 12 V is required to power up the relays and Arduino requires the power supply of 7
V. If the DPDT (Double Pole Double Throw) switches are used then the kit can be made to
work manually as well as remotely.
Furthermore, the system can be improved for the door control, the temperature detection, the
light dimmer control etc. Similarly, the application can be improved for voice recognition. The
Smart Home Automation can be improved for receiving and sending signal through ESP8266
Wi-Fi module and can be controlled through mobile or computer via web.
Three-Axis Auto Stabilizing Video Camera PlatformEklavya Sharma
Basically auto-stabilizing platform consists of platform which is balanced by movement of three servo motors in opposite direction to the movement of the platform. Arduino Uno process the tilt angles obtained from MPU-6050 and give instruction to the respective servo motors to rotate by certain angle depending on its previous position to balance or control the platform. The intent of the platform design is to maintain the platform at an initially selected angle while the support structure orientation changes. The software was written with logic to convert the digital data from the accelerometer and gyroscope to an acceleration and gyro magnitude vector and then converted
in degrees. The InvenSense MPU-6050 sensor contains a 3axis MEMS accelerometer and a 3axis MEMS gyro in a single chip whose outputs are calibrated properly by using KALMAN FILTER
to give the precise angle. The magnitude of the angle was then compared to a predetermined mathematical function to infer the angle of tilt of the platform. The angle of tilt is then converted
to angle of rotation for the servos to adjust their current position and bring the platform in balanced condition. Testing showed the platform to perform as expected. Although some error on the final angle was expected, the magnitude of the error observed indicated the platform design has a high sensitivity to low tolerance mechanical joints (slop). Overall the platform design was validated based on the positional accuracy of the platform given the low quality components used to create it. In other words, the platform performed greater than the sum of its parts.
MOBILE CONTROLLED ROBOTIC ARM USING ARDUINO AND HC-06Eklavya Sharma
Design and control of RoboDroid to do monotonous job using a smartphone only. The robot is named ‘RoboDroid’ as it utilizes concept of both Robotics and Android.
It is a mechanical arm with movable base that is controlled by an
application through Android Smartphone via Bluetooth using a
most commonly used Bluetooth module HC-06 and programmed
with Arduino Uno. Research Paper ranked first in BITS apogee in Electronics and instrumentation.
SMART HOME AUTOMATION USING MOBILE APPLICATIONEklavya Sharma
Concept of Smart Home Automation
Communication with the microcontroller or sensors
Establishing Serial communication between Arduino and Mobile
To design a User Interface for HMI i.e. Mobile Application using MIT App Inventor
To design the hardware connections between Arduino, HC-06, Relay and AC-loads
MOBILE CONTROLLED ROBOTIC ARM USING ARDUINO AND HC-06Eklavya Sharma
Design and control of RoboDroid to do monotonous job using a smartphone only. The robot is named ‘RoboDroid’ as it utilizes concept of both Robotics and Android.
It is a mechanical arm with movable base that is controlled by an
application through Android Smartphone via Bluetooth using a
most commonly used Bluetooth module HC-06 and programmed
with Arduino Uno. For more info- www.codevista.net
Three axis auto stabilizing video camera platformEklavya Sharma
It is self made 3 axis auto stabilizing platform project based on Arduino board. and using MPU-6050 gyroscope.
Auto Stabilizing Platform consists of platform which is balanced by movement of three servo motors in opposite direction to the movement of the platform.
To study thermal imaging technology for the protection of power system equipment and to interface FLIR thermal imaging camera with MATLAB for real time thermal imaging of electrical power equipment
Infinite bus bar is one which keeps constant voltage and frequency although the load varies. Thus it may behave like a voltage source with zero internal impedance and infinite rotational inertia.
(a).Evolution of electric grid
(b).Concept of electric grid
(c).Definition of smart grid
(d).Needs of smart grid
(e).Smart grid drivers and function
(f).Opportunities, challenges and benefits of smart grid
(g).Difference between conventional and smart grid
(a).What is smart grid technology?
(b).Role and necessity of smart grid technology
(c).Benefits and application of grid
(d).Various challenge of grid
(e).Best possible location
To study coal based thermal power plant including (a). Site selection (b). Classification (c). Merits and demerits (d). Environmental impacts (e). Basic layout (f). Various parts (g).Working.
(a)What do you mean by smart substation, smart feeders & Transmission system?
(b)What is need of smart substation, smart feeders & Transmission system?
(c) What are various merits and benefits of smart substation, smart feeders & Transmission system?
(d) Various technologies to make adjusting system into smart substation, smart distribution & Transmission system?
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
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The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
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Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
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The Benefits and Techniques of Trenchless Pipe Repair.pdf
Design a Highly Efficient Push-Pull converter for Photovoltaic Applications
1. Design a Highly Efficient Push-Pull converter for
Photovoltaic Applications
Umesh Kumar1,a)
Navtej Swaroop Singh1,b)
Department of EEE Department of EEE
BKBIET, Pilani, India BKBIET, Pilani , India
umesh.pilani@gmail.com navtej631@gmail.com
Eklavya Sharma2
Bavessh Raina3
Department of EE Department of CS
BKBIET,Pilani,India. BKBIET,Pilani,India3
.
Abstract
Renewable energy source plays an important role in
energy co-generation and distribution. A traditional solar-
based inverter system has two stages cascaded, which has
simpler controller but low efficiency. A new solar-based
single-stage grid-connected inverter system can achieve
higher efficiency by reducing the power semiconductor
switching loss and output stable and synchronizing sinusoidal
current into the utility grid.
The need for renewable energy sources is on the rise
because of the acute energy crisis in the world today. India
plans to produce 20 Giga-watts Solar power by the year
2020, whereas we have only realized less than half a Giga-
watt of our potential as of March 2010. 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.
PVs are used in order to convert solar energy into
electric power. They make use of solar cells to produce direct
current so as to power equipment or to recharge a battery. An
inverter whose efficiency is about 95% is necessary in order to
convert the DC current produced by PVs to AC. Solar cells
must be protected from damages so most of the times are
closely packed behind a sheet made of glass. The power which
is required is usually much bigger than that a single solar cell
can deliver, thus cells are electrically connected together to
make solar panels - solar modules. The solar panel is then
used in a larger photovoltaic system as a component. We
create then a linked connection of solar panels to create a
photovoltaic array. In a PV array now the PV panels are
firstly connected in series in order to obtain the required
voltage and then the 'individual strings' are connected in
parallel so as to provide the desired current to our system.
The building integrated PV systems are particularly materials
which are used to replace the ordinary construction materials
in certain regions of a building such as roof and windows.
They are available in several forms like flat roofs, pitched
roofs, facades and glazing. These PV materials are used more
and more nowadays as they can provide the new buildings
with sufficient electrical power, while they can be positioned
also to existing buildings. PVs are an opportunity for making
an aesthetically appealing and attractive building. It is very
important also that they don't produce noise. BIPVs can serve
as thermal insulation materials because of their sandwich
construction (the modules themselves, the layer of air within
the modules, the ray absorption by the crystalline silicon)
meaning we have a diminishing heat loss from the interior of
the building to the exterior environment. They are used as a
basic or additional source of power. If the building is at a
small distance from the existing grid, the optimum usage of the
PVs is applicable; they can cover the building's needs and sell
then the superfluity to the grid, having a specific feed-in tariff.
In this thesis, we examine a schematic to extract
maximum obtainable solar power from a PV module and use
the energy for a DC application. This project investigates in
detail the concept of Maximum Power Point Tracking
(MPPT) which significantly increases the efficiency of the
solar photovoltaic system.
Keywords— Maximum Power Point Tracking-
MPPT ,Capture Compare PWM -CCP, Standard wire
Gage-SWG ,Timer Register of Controller –TGC,
Modulation Index -Ma
Introduction
As of 2012, these state industries accounted for over
18,591 full-time equivalent employees across 1,100 businesses
accounting for $3.7 billion in annual gross revenues. This
growth is especially noteworthy in the solar industry. Total
registered capacity has increased from less than 1 megawatt
(MW) in 2006 to 632 MW in 2012, which amounts to an
average annual growth rate of 1,243%. Powered by over 500
state businesses working in the solar space,3 this trajectory
ranks North Carolina as the 3rd most active state in the nation
in terms of new solar additions in 2013 Q3. Geothermal
(ground-source) heat pumps have grown in popularity globally
with annual increases of approximately 10% in many areas.5
Growth in North Carolina’s renewable energy and energy
efficiency sectors is driven by many factors, including the
falling price of installation, rising electricity prices, and the
predictability of state renewable energy incentives. The price
of solar panels has fallen 60% since 2011,6 and it is expected
that, for the majority of electricity ratepayers, utility scale and
commercial scale solar PV systems in North Carolina will
2. deliver at grid parity without any solar subsidies within the
next five years. Residential scale solar PV systems will deliver
at grid parity around the year 2020.
In light of these trends, the purpose of this Paper is to
assess the financial, personal, and policy drivers that have
influenced residential owners of solar PV and geothermal
systems in North Carolina to make these investments. In
January 2012, the NC Sustainable Energy Association and the
University of North Carolina at Chapel Hill Kenan-Flagler
Business School conducted a survey of 1,323 solar PV owners
and 1,023 geothermal system owners to assess the motivations
behind their decision to purchase a renewable energy system,
challenges faced in the process, energy efficiency behaviors in
which they engage, energy efficiency products and design they
have chosen, and characteristics of these consumers.
Among other objectives, the results of this study can be
used for the following:
To assess which policies and incentives are
working and need to be reinforced,
To understand which incentives require greater
education to enable their full effect,
To expand residential and commercial solar PV
and geothermal adoption in North Carolina and
other states, and
To inform outreach messaging that encourages
individuals to adopt energy efficient technologies
and energy-saving behaviors.
Literature Survey
1. Cost and Lifespan study
This project presents the results of electrical
performance measurements of 204 crystalline silicon-wafer
based photovoltaic modules following long-term continuous
outdoor exposure. The modules comprise a set of 53 module
types originating from 20 different producers, all of which
were originally characterized at the European Solar Test
Installation (ESTI), over the period 1982-1986. The modules
represent diverse generations of PV technologies, different
encapsulation and substrate materials. The modules electrical
performance was determined according to the standards IEC
60891 and the IEC 60904 series, electrical insulation tests
were performed according to the recent IEC 61215 edition 2.
Many manufacturers currently give a double power warranty
for their products, typically 90% of the initial maximum
power after 10 years and 80% of the original maximum power
after 25 years. Applying the same criteria (taking into account
modules electrical performance only and assuming 2•5%
measurement uncertainty of a testing lab) only 17•6% of
modules failed (35 modules out of 204 tested). Remarkably
even if we consider the initial warranty period i.e. 10% of
Pmax after 10 years, more than 65•7% of modules exposed for
20 years exceed this criteria. The definition of life time is a
difficult task as there does not yet appear to be a fixed
catastrophic failure point in module ageing but more of a
gradual degradation. Therefore, if a system continues to
produce energy which satisfies the user need it has not yet
reached its end of life. If we consider this level arbitrarily to
be the 80% of initial power then all indications from the
measurements and observations made in this paper are that the
useful lifetime of solar modules is not limited to the
commonly assumed 20 year.
2. Rate Calculation
As the solar photovoltaic (PV) matures, the economic
feasibility of PV projects is increasingly being evaluated
using the levelized cost of electricity (LCOE) generation
in order to be compared to other electricity generation
technologies. Unfortunately, there is lack of clarity of
reporting assumptions, justifications and degree of
completeness in LCOE calculations, which produces
widely varying and contradictory results. This paper
reviews the methodology of properly calculating the
LCOE for solar PV, correcting the misconceptions made
in the assumptions found throughout the literature. Then a
template is provided for better reporting of LCOE results
for PV needed to influence policy mandates or make
invest decisions. A numerical example is provided with
variable ranges to test sensitivity, allowing for
conclusions to be drawn on the most important variables.
Grid parity is considered when the LCOE of solar PV is
comparable with grid electrical prices of conventional
technologies and is the industry target for cost-
effectiveness.
3. Carbon Emission
The challenge of stabilizing global carbon emissions over the
next 50 years has been framed in the context of finding seven
1.0 G ton C/year carbon reduction wedges. Solar PV could
provide at least one carbon wedge, but will require significant
growth in PV manufacturing capacity. The actual amount of
installed PV capacity required to reach wedge-level carbon
reductions will vary greatly depending on the mix of avoided
fuels and the additional emissions from manufacturing PV
capacity. In this work, we find that the US could reduce its
carbon emissions by 0.25 Gton C/year, equal to the fraction of
a global carbon wedge proportional to its current domestic
electricity use, by installing 792–811 GW of PV capacity. We
evaluate a series of PV growth scenarios and find that wedge-
level reductions could be met by increasing PV manufacturing
capacity and annual installations by 0.95 GW/year/year each
year from 2009 to 2050 or by increasing up to 4 GW/year/year
3. for a period of 4–17 years for early and late growth scenarios.
This challenge of increasing PV manufacturing capacity and
market demand is significant but not out of line with the recent
rapid growth in both the global and US PV industry. We find
that the rapid growth in PV manufacturing capacity leads to a
short term increase in carbon emissions from the US electric
sector. However, this increase is small, contributing less than
an additional 0.3% to electric sector emissions for less than
4.5 years, alleviating recent concern regarding carbon
emissions from rapid PV growth scenarios.
4. Connecting To the Grid
In this work, we examine some of the limits to
large-scale deployment of solar photovoltaics (PV) in
traditional electric power systems. Specifically, we
evaluate the ability of PV to provide a large fraction (up
to 50%) of a utility system's energy by comparing hourly
output of a simulated large PV system to the amount of
electricity actually usable. The simulations use hourly
recorded solar insolation and load data for Texas in the
year 2000 and consider the constraints of traditional
electricity generation plants to reduce output and
accommodate intermittent PV generation. We find that
under high penetration levels and existing grid-operation
procedures and rules, the system will have excess PV
generation during certain periods of the year. Several
metrics are developed to examine this excess PV
generation and resulting costs as a function of PV
penetration at different levels of system flexibility. The
limited flexibility of base load generators produces
increasingly large amounts of unusable PV generation
when PV provides perhaps 10–20% of a system's energy.
Measures to increase PV penetration beyond this range
will be discussed and quantified in a follow-up analysis..
5. Plant Design
The development of newer technologies in concentrating
solar power (CSP) plants, particularly plants using dish
Stirling systems, as well as changes in the design of
photovoltaic (PV) inverters is creating new challenges in
the design of low- and medium-voltage collector systems
for large solar power plants. Furthermore, interconnect
requirements for reactive power, voltage, and ramp rate
control and the characteristics of solar power require
unique solutions for optimal plant design.
Problem Statement
While PV systems have no moving parts (compared
to wind and micro hydro systems) and can be extremely
reliable, it does not mean they do not have potential
performance problems, which can stem from external and
internal issues.
External issues such as shade from growing trees
and module soiling (dust or soot from local air pollution), are
common problems that can reduce energy output significantly.
Studies on module soiling show an average annual energy loss
of 5% for arrays that are not periodically cleaned. These types
of problems are usually easily solved by intermittently
trimming vegetation and cleaning arrays. Impact to PV
systems from critters is another external issue, but one that
takes a little more consideration to fix. Wires might be
damaged by rodents chewing on them; modules soiled by
birds pooping on them; or cells shaded by weeds sprouting
between the module frames from dirt and/or bird “fertilizer”
beneath the array. The fix-it for stopping critters in their tracks
is to install rodent barriers and/or bird spikes. Many installers
are tackling this problem pre-emptively, including some kind
of screen or wire that keeps critters out but allows air to flow
beneath the array.
Internal Issues such as module/cell damage, can
also reduce system output. Sometimes these problems are easy
to spot, but often they are not. Visually inspecting the PV
array once a year is a good idea. Look for cracks in the glass,
brown/burn spots on both the front and the back of the
modules, burnt solder joints on the cell “grid,” and signs of
delamination and cell damage.
Objective of Project
In this project main focus to study grid connected
distributed generation system having solar energy, fuel
cell as an energy sources and minimise the losses of DC-
DC converter with design an effective control system.
Microgrid
Microgrid is a new type of power systems consisting
of generation sources, loads and energy storages. In another
words, it is an association of a small modular generation
system, a low voltage distribution network and load units
interfaced by means of fast acting power electronics.
Microgrids are determined usually in accordance with a few
definitive functions. They are usually used in small urban
areas or in small industry. The most common power range for
microgrids is from 25 to 100 kW.
The components of the microgrid system are
recognized in accordance with their function.The grid forming
units are able to control the voltage and frequency of the grid
4. by balancing the power of the loads and generators. Among
the grid forming units are the diesel generators and battery
inverters. The grid supporting units are simple control units.
Their active and reactive power simply depends on the voltage
and frequency characteristics of the systems.
PV modelling
A PV array consists of several photovoltaic cells in series and
parallel connections. Seriesconnections are responsible for
increasing the voltage of the module whereas the
parallelconnection is responsible for increasing the current in
the array.Typically a solar cell can be modeled by a current
source and an inverted diode connected inparallel to it. It has
its own series and parallel resistance. Series resistance is due
to hindrance inthe path of flow of electrons from n to p
junction and parallel resistance is due to the leakagecurrent.
In this model we consider a current source (I) along with a
diode and series resistance (Rs). Theshunt resistance (RSH) in
parallel is very high, has a negligible effect and can be
neglected /The output current from the photovoltaic array
is I=Isc – Id
Id= Io (eqVd/kT - 1)
where Io is the reverse saturation current of the diode,
q is the electron charge, Vd is the voltage across the diode,
k is Boltzmann constant (1.38 * 10-19 J/K) and T is the
junction temperature inKelvin (K)
From equations above
. Figure No. 1: Single diode model of a PV cell
Using suitable approximations,
I = Isc – Io (eq((V+IRs)/nkT) - 1)
where, I is the photovoltaic cell current, V is the PV cell
voltage, T is the temperature (in Kelvin)and n is the diode
ideality factor.
In order to model the solar panel accurately we
can use two diode model but in our project ourscope of study
is limited to the single diode model. Also, the shunt resistance
is very high andcan be neglected during the course of our
study.
Figure No. 2 : I-V characteristics of a solar panel
The I-V characteristics of a typical solar cell are
as shown in the Figure .When the voltage and the current
characteristics are multiplied we get the P-V characteristics as
shown in Figure. The point indicated as MPP is the point at
which the panel power output is maximum.
Figure No. 3 : P-V characteristics curve of photovoltaic cell
Push Pull
A push–pull converter is a type of DC-to-DC converter, a
switching converter that uses a transformer to change the
voltage of a DC power supply. The distinguishing feature of a
push-pull converter is that the transformer primary is supplied
with current from the input line by pairs of transistors in a
symmetrical push-pull circuit. The transistors are alternately
switched on and off, periodically reversing the current in the
transformer. Therefore current is drawn from the line during
both halves of the switching cycle.
Figure No 4: Half Bridge Push Pull Convertor
5. VL= [(Vd-1) (Nm/No)-0.5]*2*D
L=0.5* VI *D
C= (80*10-6
* dI)/VO
MPPT and Algorithm
A typical solar panel converts only 30 to 40 percent
of the incident solar irradiation into electrical energy.
Maximum power point tracking technique is used to improve
the efficiency of the solar panel. According to Maximum
Power Transfer theorem, the power output of a circuit is
maximum when the Thevenin impedance of the circuit (source
impedance) matches with the load impedance. Hence our
problem of tracking the maximum power point reduces to an
impedance matching problem.
In the source side we are using a boost convertor connected to
a solar panel in order to enhance the output voltage so that it
can be used for different applications like motor load. By
changing the duty cycle of the boost converter appropriately
we can match the source impedance with that of the load
impedance.
Perturb & Observe(P&O) Algorithm
Inverter
The dc-ac converter, also known as the inverter,
converts dc power to ac power at desired output voltage and
frequency. The dc power input to the inverter is obtained from
an existing power supply network or from a rotating alternator
through a rectifier or a battery, fuel cell, photovoltaic array or
magneto hydrodynamic generator. The filter capacitor across
the input terminals of the inverter provides a constant dc link
voltage. The inverter therefore is an adjustable-frequency
voltage source. The configuration of ac to dc converter and dc
to ac inverter is called a dc-link converter.
The single-phase units can be joined to have three-phase or
multiphase topologies. Some industrial applications of
inverters are for adjustable-speed ac drives, induction heating,
standby aircraft power supplies, UPS (uninterruptible power
supplies) for computers, HVDC transmission lines, etc
Pulse Width Modulation Control
The fundamental magnitude of the output voltage
from an inverter can be controlled to be constant by exercising
control within the inverter itself that is no external control
circuitry is required. The most efficient method of doing this is
by Pulse Width Modulation (PWM) control used within the
inverter. In this scheme the inverter is fed by a fixed input
voltage and a controlled ac voltage is obtained by adjusting
the on and the off periods of the inverter components. The
advantages of the PWM control scheme are :
a) The output voltage control can be obtained without addition
of any external components.
b) PWM minimizes the lower order harmonics, while the
higher order harmonics can be eliminated using a
filter.
Figure No. 5: Sinusoidal PWM Generation
The disadvantage possessed by this scheme is that
the switching devices used in the inverter are expensive as
they must possess low turn on and turn off times, nevertheless
6. Filter
Comparing the parallel and series active filter as
shown in Figure, the parallel filter has better performance on
system efficiency, since the active filter only processes the
ripple energy and the PV array outputs the average power. The
parallel active filter cannot boost the solar array output voltage
to facilitate the inverter design.
Figure No. 6: Single Stage Inverter with Active Filter
For series active filter, it is better to use boost
converter as the first stage, which has continued current
without any switching ripples. The objective of the DC/DC
controller is to regulate the output voltage of the DC/DC
converter to be constant, and the objective of the inverter
controller is to regulate the output current of the inverter to be
pure sinusoid.
For instance, if the output voltage of the active filter is
100VDC and the voltage ripple is 3V, then the capacitance
needed is 4.4μF/Watts from equation (3.8), which is about 10
times smaller than the passive filter. The controller of the
inverter has two loops. The outer loop is the DC voltage
regulation loop; the other is the output current regulation
loop. Note that there is a low pass filter on the loop of the
inverter controller, which will filter out the 120/100Hz ripple
on the DC bus to get the average value of the DC bus. Then
the bandwidth of the outer loop is lower than 120/100Hz.
PCB Layout
Figure No. 7 : PCB Layout
Converter Parameters
Parameters Rating
Switching Frequency 40 KHz
Duty Ratio .45
O/p Capacitors 40 uH
Gate Pulse Voltage 12
Figure No. 8 : Controller Circuit
Simulation of Push Pull Converter
Simulation of Inverter on Matlab
7. Result
Different waveforms are observed given below:
1. Gate Pulses for Push Pull Converter
2. Output Voltage at different Inputs:
At 289 V:
At 401 V:
Conclusion
By using DC-DC converter topology here above
circuit is work up to 150 watt. The converter is designed for
100 watt and efficiency in open loop is 98%. Half Bridge
Push-Pull converters are basically used for low power
applications up to 200 watt. For high power applications
flyback and forward converter topologies are used.
It has been highlighted that there is a vast resource
available and PV technology is one of the most feasible
renewable energy’s for electricity generation within the urban
environment.
Future Scope
Future scope of this project is to provide controlled
close loop with PID controller and to design full bridge
sinusoidal inverter. The technology is reliable and relatively
simple to install and easy to maintain. Considering the
expertise that exists in the UK it is strange that PV does not
play a greater part in our lives. One of the main reasons is that
electric power generated from PV is too expensive to compete
in Scotland and the UK due to the low prices of fossil-fuel,
nuclear and even wind power.
Reference
[1]. H. L. Willis and W. G. Scott, Distributed Power
Generation, Marcel Dekker, New York,2000.
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