The integration of large-scale renewable energy source reduces the rotational inertia and primary frequency regulation capability of power systems. Motor-generator pair (MGP) system can provide the real rotational inertia without delay. The system structure and inertia level of a renewable energy integration MGP are introduced. The damp effect of MGP on the initial rate of change of frequency (ROCOF) is calculated. Based on the DC voltage feedback control strategy of MGP driven by photovoltaic (PV) integration, a constant load shedding control algorithm is proposed. A frequency feedback loop is introduced, and then the integrated control strategy of MGP driven by PV participating in power system frequency regulation is formed. Finally, through a 3-bus-9-node simulation system, the load shedding control algorithm is verified. The system primary frequency regulation effect of PV integration by different methods is compared in the conditions of the power fluctuating of source side and grid side. The result shows that under the integrated control strategy, PV integration driving MGP can supply stronger frequency support to the system.