Integrated Energy Exchange Scheduling for Multi-microgrid System with Electric Vehicles

摘要

Electric vehicles (EVs) can be considered as flexible mobile battery storagesin microgrids. For multiple microgrids in an area, coordinated scheduling oncharging and discharging are required to avoid power exchange spikes betweenthe multimicrogrid system and the main grid. In this paper, a two-stageintegrated energy exchange scheduling strategy for multimicrogrid system ispresented, which considers EVs as storage devices. Then several dual variables,which are representative of the marginal cost of proper constraints, areutilized to form an updated price, thereby being a modification on the originalelectricity price. With this updated price signal, a price-based decentralizedscheduling strategy is presented for the Microgrid Central Controller (MGCC).Simulation results show that the two-stage scheduling strategy reduces theelectricity cost and avoids frequent transitions between batterycharging/discharging states. With the proposed decentralized schedulingstrategy, each microgrid only needs to solve its local problem and limits thetotal power exchange within the safe range.