Distributed Cooperative Control Based on Multiagent System for Islanded Microgrids With Switching Topology and Channel Interruption

Abstract

In this article, to reduce the deviation of frequency/voltage and power sharing in islanded microgrids, a distributed coordinated control based on multiagent system (MAS) is proposed. A hierarchical control structure is designed in this strategy. For the poor dynamic performance in the primary control, coordinated compensation terms are added to the traditional droop control-loop to reduce the transient fluctuation in frequency/voltage under load change. In the secondary control, an event-triggered consensus protocol is applied to restore frequency/voltage, obtain equal per-unit power sharing, and relieve communication pressure. Also, the communication network is viewed as an unreliable switching graph under communication channel interruption. To this end, a data prediction compensation mechanism is proposed to ensure the secondary control on the right track. Furthermore, to predict the lost data caused by communication channel interruption, an improved exponential smoothing model based on time series is proposed. Finally, several simulation scenarios have been carried out in MATLAB/Simulink to illustrate the validity of the theoretical results.