A novel hierarchical control strategy combined with sliding mode control and consensus control for islanded micro-grid

Abstract

In order to improve the control effect on voltage and frequency of each distributed energy resource (DER) and improve the stability of the islanded micro-grid, a novel hierarchical control strategy combined sliding mode control (SMC) and consensus control is proposed in this study. The control structure is divided into two layers: The physical layer and the cyber layer. In the physical layer, in order to improve the dynamic control effect, an improved droop control based on consensus theory with considering packet loss is proposed in this study. And the control can be completed in finite time by selecting the approximate parameters in the controller; in order to improve the stability of voltage loop and current loop, an improved double closed-loop structure based on the SMC is proposed. Moreover, the control can also be completed in the finite time. In the cyber layer, an event-triggered SMC-virtual leader-following consensus protocol is proposed in this study to solve the problem of channel noise (disturbance). For improving the control effect, the protocol is used to complete the secondary control on voltage and frequency of each DER. Finally, the effectiveness of the novel control strategy is verified by simulation results.