Distributed Coordinated Control of AC/DC Microgrid Voltage Containing Electric Vehicles

Combining the advantages of DC microgrids (DC-MGs) and AC microgrids (AC-MGs), AC and DC hybrid microgrids (AC&DC-HMGs) have higher energy efficiency than AC-MGs, and overcome the disadvantages of DC-MGs which have many converters. But AC&DC-HMGs with renewable energy generation and electric vehicles (EVs) intensify the uncertainty on both sides of the supply and demand, and present some challenges to the power quality like voltage fluctuations. To address the issue, in this paper, EVs connected in AC&DC-HMGs are considered as distributed controllable active power units, to optimally regulate total active power injection at the key nodes to keep the voltages within the upper and lower limits. The optimal model is proposed with objective aiming at minimization of voltage deviation, and is distributed solved by applying the gossip algorithm. The proposed method is applied to the distributed voltage control of a typical AC&DC-HMG. The simulation results show that optimal charging and discharging control of EVs connected to the key nodes can regulate the voltage of total AC&DC-HMG dynamically to keep them withing limits with less communications.