Comparative Study of Different Current Control Techniques for Single Phase Grid Integrated Photovoltaic System

In this paper, design, analysis and control of single phase grid connected photovoltaic system is proposed. Basically two controllers are associated with this system. First, maximum power is extracted from photovoltaic system by using input side MPPT controller and second, grid side controller which performs DC-link voltage control and injecting harmonic free current into the grid. The main objective is to control grid current with the help of controllers for which current controller of grid must follow sinusoidal reference synchronized with grid voltage. A comparative study between Proportional Integral current controller, Hysteresis current controller and Predictive current controller is done for single phase grid integrated photovoltaic system with the help of MATLAB/Simulink software. The performance of all three controllers are examined and compared with the help of their performance. Simulation results demonstrated that predictive current controller gives fast response, minimum distortion and good reference tracking when compared with other two controllers.