부산대학교 도서관

In a system integrated with photovoltaic power generation and energy storage, there are interactions between the components, and different choices of controller parameters will affect the overall stability of the system. This paper firstly derives the impedance models of the photovoltaic power generation system, the energy storage system and the grid-side converter and the grid system according to their topologies and control strategies. Then, the impedance ratio of the system integrated with photovoltaic power generation and energy storage is obtained, and combining with the log-frequency stability criterion, the effect of different controller parameters on the stability of the system is studied. The results show that with the proportional gain of the voltage loop and the proportional gain of the current loop of the grid-side converter and the proportional gain of the voltage loop of the energy storage system increasing, the stability of the system decreases. It is also found that the proportional gain of the voltage loop of the photovoltaic power generation system has little influence on system stability. Finally, the correctness of the analysis results is verified by building a simulation model of a system integrated with photovoltaic power generation and energy storage.