Modeling And Simulation Of Photovoltaic Power Generation System

This study is focus on a Grid Connected photovoltaic Generation system(PV-GCGS)with a Maximum Power Point Tracking(MPPT),the system contain two stage,Boost converter stage boost the PV voltage with MPPT,and DC-AC conversation stage represent in three phase voltage inverter.The grid connected inverter is responsible for maintaining the DC link voltage constant,to accomplish the grid connected inverter task,a cascaded control structure is used: the outer control loop is the DC link voltage loop,while the inner control loop is the direct axis inverter current,and quadrature axis current components,also we used a classical proportional integral controller(PI)and fuzzy logic controller(FLC)are used to control the DC link voltage.The system component design to meet a good performance in the grid,current controller is proposed to regulate the inverter voltage amplitude to be equal to the grid voltage in order to minimize the reactive power consumed by the transformer leakage reactance.The problem of leakage current in the PV will result in current distortions and harmonics in the system.Also the present of non-linear loads in distribution system will inject harmonics to the system in this study to reduce the harmonics in system we use Space Vector Pulse Width Modulation(SVPWM),PI and FLC controllers,The harmonic distortion is higher in Proportional Integral(PI)controller and hence it can be reduced by using FLC,the simulation results of three phase current control with SVPWM also analysis the characteristics of system performance under PI and FLC controllers,this study presents a comparison on PI and FLC for control of SVPWM inverter.A Matlab/Simulink based simulation is performed on proposed system and the results are presented for the PV generation system in grid connected inverter mode operation.