Abstract:The inverters have a fast regulation speed and the primary frequency regulation capacity of the photovoltaic power station can significantly reduce the conventional primary frequency regulation reserve capacity, so it will be a good choice for the photovoltaic power station to deeply participate in the primary frequency control of the power grid. In view of this, this article is to implement active power-frequency droop control characteristic of the photovoltaic power plant based on the automatic generation control (AGC) system. On this basis, the integration of AGC control and primary frequency control comes true without the need for hardware addition or modification. Secondly, the primary frequency control and AGC control matching strategy is added to achieve seamless cooperation between the two. Finally, the active power allocation strategy is improved in light of the shortage of active power tracking capability, which improves the accuracy of active power control and the contribution of frequency control. After the validation of the rapid frequency test of the Northwest Power Grid, the results show that primary frequency control of photovoltaic power station based on automatic generation control system has better performance in the response speed and frequency control contribution and shall provide support for power grid frequency stability.