Abstract：With the increasing penetration of new energy equipment，while alleviating the environmental

problems caused by fossil energy，it also increases the frequency instability of the system. Photovoltaic（PV）and

other new energy equipment to participate in the grid frequency regulation is an effective way to improve the

frequency stability of the power system.First，the basic principle of frequency response of synchronous machine

was analyzed，the correspondence was determined which is between active output of PV power generation and

primary frequency regulation and inertia response，and the virtual synchronous control strategy of PV power

generation was formed. Then，based on the power-frequency correspondence relationship of primary frequency

regulation，it gave the parameter adjustment method that directly corresponds to the frequency and the load

shedding rate，and realized the function of primary frequency regulation. Once again，based on the inertia response minus the frequency-power correspondence relationship，it gave the inertia response minus the frequency-power correspondence relationship，which is the most effective way to improve frequency stability of power system. Once again，based on the correspondence between inertia response frequency reduction and power，the parameter setting method of inertia response load shedding rate was given，and the negative influence of inertia in the process of frequency restoration was avoided through the determination of application conditions of inertia response. Finally，the PV grid-connected model was constructed，which verified that the PV load shedding operation has the ability to participate in the frequency regulation of the power grid.

      Key words：photovoltaic（PV）power generation；load shedding control；primary frequency regulation；inertia response