Microgrid emergency control based on the stratified controllable load shedding optimization

This paper proposes a microgrid emergency control strategy-the stratified controllable load shedding optimization. Firstly the method stratifies controllable load into different levels based on the degree of load importance and load frequency regulation effect coefficient (KL). Then the optimization model is put forward. It is difficult to deal with since it is a nonlinear mixed integer programming problem. This paper proposes a new step-by-step solution and its principle is described in detail. The feasibility of the method is verified by carrying out with Matlab. The modified IEEE 9-bus distribution system is used to simulate a microgrid. The emergency controllable load stratification is put forward, and the results are listed. By comparing with the traditional method of load shedding and analysing the results, we can conclude that the proposed method is reasonable and effective.