Abstract: Aiming at the incoordination and mutual interference between primary frequency modulation and automatic generation control（AGC）of photovoltaic power station,a coordinated control method of multi-master stations is proposed,which could be applied in photovoltaic power station. The power control of photovoltaic power station inverter for two master stations is realized through the coordination of primary frequency modulation measurement and control system and AGC system. Through the modification application in the photovoltaic power station,the frequency disturbance test and the coordination test are completed. Experimental study shows that the retrofitted photovoltaic power station can participate in the primary frequency modulation of the system,and it’s indicators can exceed the regulation performance of conventional thermal and hydroelectric power station.