Abstract: Based on the continuous and smooth adjustment capability of the active power of the wind-solar storage,this paper proposes a power grid prevention-emergency control strategy based on wind-solar storage and load shedding optimization. Firstly,the principle of the wind-solar storage participation in grid prevention-emergency control is analyzed and the control strategy is given. Before the fault occurring,the active reserve capacity is reserved by reducing the wind-solar output,and the system power fluctuation caused by the change of wind-solar output is smoothed by adjusting the generator unit output and storage charging or discharging status. After the fault occurring,the wind-solar reserved active backup is given priority to fill the system power imbalance,if it is not enough,then taking load shedding measures for emergency control. Finally,considering the cost of wind-solar reserved active backup,the cost of prevention and emergency control measures,the prevention and emergency control models for the participation of wind-solar storage in the power grid are established,respectively. Solving the models with CPLEX solver. The final example analysis of the improved IEEE 39 node verifies the effectiveness of the proposed control architecture and control method.