Study on smooth switching of microgrid operation states using sliding mode control

Droop control is often used for smooth switching of microgrid. In this paper, a new robust droop control strategy is proposed by designing a compensatory sliding mode controller to enhance the system stability. The load angle-voltage is used for droop control variable, and state space equations are established based on the droop control structure. In addition, a compensatory nonlinear controller is designed via sliding mode control method to mitigate the frequency chattering phenomenon caused by switching of microgrid operation states, so that system stability and response rapidity are guaranteed. In the end, the simulation results obtained from Matlab/Simulink platform show the validity of the proposed scheme.