Research of an improved grid-connected PV generation inverter control system

The paper firstly introduces the structure and operational principle of the present grid-connected PV generation system. And then describes the two inverter control methods including the voltage source inverter control method and the power type PWM inverter control method which are common used at present. Based on the above two kinds of inverter control methods, the second step is to present an improved PWM inverter control system that can be applied in grid-connected PV generation. Finally, it constructs a single-phase grid-connected PV generation system, and uses MATLAB/Simulink software to simulate and analyze. The result of the simulation shows that the improved inverter control system can effectively control the grid current waveform which tends to sine wave, meanwhile it can achieve the maximum power point tracking, besides it is able to put the arbitrary power out to the load or to the grid, while the control system has a good stability.