Abstract:With the development of photovoltaic power generation (PV), the stability of grid-connected PV system becomes more and more serious. In this paper, a control strategy for virtual synchronizer in photovoltaic system is proposed to solve this problem. At the same time, the frequency active power compensation link is introduced to adjust the output power of PV array in response to the change of power output power caused by frequency disturbance. Provide sufficient reserve active power for primary regulation of the system. The strategy effectively utilizes the characteristics of photovoltaic power supply, makes the system have active backup ability in normal operation, and ensures the stability of power grid. The problems of inertia deterioration and lack of frequency regulation ability related to large-scale grid-connected photovoltaic power generation are solved.