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Abstract
Name: Ahmed Emad-Eldeen Hussein Mahmoud
Title of thesis: Performance Study of a Grid Connected Photovoltaic System
Degree: PhD Degree in Renewable Energy Science and Engineering, Department,Faculty of postgraduate studies for advanced sciences, Beni-Suef University, 2020
This thesis introduced a Study of a Grid Connected Photovoltaic System, the increasing demand of energy around the world requires a continuous search for new sources of endless energy to fulfill the ascending requirements for people needs of energy ,the fossil fuel became a useless solution because it is nonrenewable and it doesn’t consider environmental friend ,thus all the world sights focusing on solar energy because it has lots of advantages and its drawbacks are not complexed comparing with the nonrenewable energy ,the solar energy could be described as clean, renewable energy.
This thesis introduces a complete view of three phase designed inverter linked to the photovoltaic system and linked to the electrical grid, the basic principle of this study is to introduce pure, continuous and clean energy that can saturate and fulfill the endless demands of energy .so, in order to achieve that an accurate study had been performed and this study includes the experimental results and the simulations graphs to make the whole vision clear and simplify the proposed strategy for the controlling system, the inverter is a very important devise it has a basic role in the designed system, the basic purpose of the inverter is to link the electrical grid to the photovoltaic system .
The responsible part for performing the synchronization between the electrical grid and the three phase inverter is the phase locked loop (PLL),the selected modulation type for implement the required control is the space vector pulse width modulation (SVPWM),the results of simulation process for the variable inputs of the proposed system were executed with the utilization of (Simulink/MATLAB) software program .
The (dq frame) rotating reference frame is used to secure the synchronization process .
In this proposed system there are three basics control circuits as follow :(current ,voltage, maximum power point) each circuit is being separately simulated and modulated in order to improve its factors and the final output behavior, all the control circuits work in synchronization and that could be clearly shown during the process of power injection into the electrical grid ,the selected controller technique for the current circuit is the proportional integral current controller. in this thesis the simulation outcomes for the three basics control circuits are explained in details ,also the full steps for power injection into grid process have been sketched and illustrated for each stage for both active and the reactive power,
In this thesis all the proposed system elements, the designed schematic , control circuits and results simulation for system factors are illustrated and presented in details ,one of the most important part of the control execution process is the dSPACE MicroLabBox-1202,it can perform lots of functions and it has many advantages ,it can process the digital signal for the system data, the proposed model of a 3-kw is designed to perform the needed experimental results and tests ,
Taking consideration that the simulation outcomes have been introduced in this thesis by the utilization of ( MATLAB/SIMULINK) in order to secure the desired quality for power injection into grid ,after the implantation of the experimental process and the accurate study for the theoretical principles it can be clearly conclude that there is a great matching ratio between the laboratory results for the proposed system and the standard theoretical results ,so the suggested system approved high quality and performance. also it could be advised to be used in the modern photovoltaic applications connected to the electrical grid.
The presented system gives high performance and superior results comparing with the sliding mode control (SMC) because the( PI ) controller can avoid the (SMC) drawbacks such as the affection of chattering stability issues, the high order of the sliding surface and the complexity of the(SMC) structure which lead to high total cost ,while using the (PI) controller guarantee high tuning control ,simplicity in design and easy to implement. the step of designing three phase inverter significantly reduce the total cost of the proposed system.
Keywords
Three phase inverter, active power, reactive power, filter, photovoltaic, Space Vector Pulse Width Modulation (SVPWM).