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Distributed Charging Control of Smart Electric Vehicle Chargers for Load Valley Filling in Distribution Networks

In this paper, a distributed control framework is presented for plug-in electric vehicle (PEV) coordinated charging, and, the valley filling strategy is developed for the smart charger to obtain the optimal charging profiles of PEVs. In the proposed optimization scheduling algorithm, the index of surplus capacity of distribution networks is defined to utilize the surplus power during the load valley hours to the utmost. Results show that the proposed distributed control method has a significant superiority over uncoordinated charging for PEVs in the aspect of relieving the demand stress on power grids.