Abstract: The integration of large-scale photovoltaic power plants into the power system reduces the system inertia and primary frequency regulation capability,leading to increased frequency fluctuations in the power grid and reduced safety and stability. Participation of photovoltaic power in the power grid frequency regulation is an important way to solve this problem.Focusing on the large impact of radiation sensors on the primary frequency regulation ability in the participation by the loadshedding operation of the existing photovoltaic power plant,as well as the complexity of load shedding algorithm formulas,this paper proposes a sensor-independent photovoltaic power plant primary frequency regulation control strategy. This strategy first designs the active standby control layer, proposes a load shedding algorithm to make the PV power plant run in load shedding according to the set active standby ratio,and thus paves the way for the primary frequency regulation. Second,the frequency response layer is designed by using the improved sag control and the virtual inertia control,and the information of grid frequency fluctuations is transformed into the increment of the active standby ratio. Third,based on the active standby control layer and the frequency response layer,the primary frequency regulation control strategy of variable standby ratio is proposed to realize the primary frequency regulation.Finally,the proposed method is experimentally verified by RT-LAB.The experimental results show that the proposed load shedding algorithm is highly reliable,and the primary frequency regulation control strategy can effectively improve the primary frequency regulation effect of the power system and alleviate the frequency regulation pressure of the new power system.