Multiagent System-Based Distributed Coordinated Control for Radial DC Microgrid Considering Transmission Time Delays

This paper focuses on a multi-agent based distributed coordinated control for radial DC microgrid considering trans-mission time delays. Firstly, a two-level multi-agent system is constructed, where local control is formulated based on local states and executed by means of the first-level agent, and dis-tributed coordinated control law is formulated based on wide-area information and executed by means of the secondary- level agent in order to improve the voltage control performances. Afterwards, the research mainly focuses on designing the local controller and the distributed coordinated controller. For pur-pose of robust stability, the local control is designed as local state-feedback based H∞ robust controller. It is worth mention-ing that the distributed coordinated control consists of local state feedback control and decoupling coordinated control law that only come from adjacent DER units. Moreover, the distributed coordinated controller is designed by means of delay-dependent H∞ robust control method taking into account transmission time delays. Finally, the validity of the proposed control scheme is demonstrated by means of simulation results.