Distributed Finite-Time Secondary Voltage Restoration of Droop-Controlled Islanded Microgrids

Abstract

In this paper, we investigate the distributed finite-time secondary voltage control for the islanded microgrid with droop-controlled, inverter-based distributed generations. By introducing an error function, a nonsingular terminal sliding manifold is established, then the secondary voltage control is converted to a tracking consensus problem of the distributed nonsingular terminal sliding mode control. In the proposed control scheme, each distributed generation unit only requires its local information and the information from neighbors, which means only a simple communication network is needed. Furthermore, the distributed controller can adjust the voltage magnitude to its reference value in despite of dynamic uncertainties and bounded external disturbances. Numerical simulations are presented to demonstrate the effectiveness of the proposed control protocol.

Keywords

• Islanded microgrids
• secondary voltage control
• nonsingular terminal sliding mode control