Research on Control Method of Photovoltaic Inverter Based on PIR

Abstract

With the rapid development of green energy, inverter technology has become a key technology for renewable energy. To solve the problem of low output voltage of photovoltaic panel, a two-stage topology is proposed. The front stage adopts high-frequency isolated phase-shifted full-bridge structure, which can realize soft-switching technology. The last stage is single-phase inverter structure. In order to achieve high efficiency, high quality output and improve the dynamic and static performance of the inverter system, based on the traditional double closed-loop proportional integral (PI) control, the current control loop proportional control and voltage control loop proportional integral resonance (PIR) control method are improved. The parameters are derived by small signal model, and the system is simulated and verified by experiments. The experimental results show that the system has good dynamic and static performance, and can effectively suppress resonance.