Abstract: With the large-scale access of photovoltaic power generation, the proportion of photovoltaic power generation in the whole power system is more and more larger. If photovoltaic power continues to operate at the maximum power point and not provide support for the frequency regulation of the system, it will probably affect the frequency security of the power grid. At present, some related studies have taken photovoltaic power generation at the maximum power point as the premise. When the frequency of the power grid rises, photovoltaic power generation reduces power output according to the set slope to participate in power grid frequency regulation. It can play a role in the frequency support of the power grid, but it is still not enough. In this paper, a new control strategy of photovoltaic power generation to participate in the regulation of the power grid frequency is proposed. There is a certain reserve for the photovoltaic power generation through power curtailment, so that the photovoltaic power has the ability to participate in the frequency regulation of the power grid by increasing or reducing the power output. When the power grid is disturbed, different active power regulation modes are used to participate in the frequency regulation of the power grid according to the initial change rate of the power grid frequency. Finally, a simulation example is given to verify the effectiveness of the proposed strategy.