Backstepping and Sliding‐Mode Techniques Applied to Distributed Secondary Control of Islanded Microgrids

In this paper, secondary voltage control scheme for a droop‐controlled inverter‐based islanded microgrid is addressed. Motivated by the cooperative control theory of multi‐agent systems, the proposed secondary voltage control is a distributed scheme which uses a simple communication network. Two nonlinear control algorithms are applied to restore the voltage of each distribution generation (DG) to the reference value. The simulation results verify the effectiveness of the proposed secondary voltage control for a prototype microgrid system.