Cooperative control strategy of energy storage and emergency load shedding based on SOC estimation

At present, the world is facing the shortage of fossil energy, environmental degradation and other problems, more and more electronic equipment loads are connected to the grid and the complex power system structure to the transient stability of the power grid to lay hidden dangers. In order to minimize the damage and economic loss caused by transient instability to the power grid, how to reasonably carry out emergency braking has become the key to solve the problem. Considering that the energy storage system has good adaptability to different instability situations, the advantages of frequency regulation are very significant. Energy storage power can be used as an important link in transient emergency control, and emergency load cutting coordinated control to ensure system stability. In order to reduce the amount of emergency control and improve the frequency of the system after load cutting, this paper proposes an emergency control strategy with load cutting as the main part and energy storage device as the auxiliary part. According to the system destabilization after the energy storage power supply to participate in the regulation of multiple types of unit system to determine the equivalent model. The SOC valuation of the energy storage power supply is taken into account with the control amount required to restore stability of the participating system. Quantify the capacity of energy storage participation in transient emergency load shedding control strategies. Design the coordinated control between energy storage power output and load shedding. Simulation experiments are carried out in an urban power grid simulation system, and through the comparison of different emergency control schemes, the simulation results show that the transient stabilization emergency control strategy of energy storage power participating in regulation can effectively improve the transient stability, reduce the amount of emergency control load cutting, and alleviate the pressure on the power grid.