Dual Closed-Loop Inverter Control System Based on Quasi-PR and PI

At present, photovoltaic power generation has been appreciated by all countries, and the inverter, as an equipment to convert direct current into alternating current, is an important equipment to convert solar energy into electricity. Scholars at home and abroad for inverter control strategy do a lot of research, but with the increase of photovoltaic installed capacity and permeability, the accuracy of the inverter output voltage waveform put forward higher requirements, before many control strategy has been unable to meet the requirements, in order to reduce the inverter output voltage distortion rate, this study puts forward a quasi-PR(Proportional Resonant) control and PI(Proportional Integral) control combined double closed-loop control strategy, finally simulation verified the feasibility of the method.