In this paper a hierarchical control method of massive plug-in electric vehicles (PEVs) for load valley filling is proposed. The architecture consists of the main control center, sub-control centers and PEVs. The objective of the main control center is to flatten the total load curve by coordination of sub-control centers. It calculates the optimal load plans for each sub-control center using a two-stage optimization method. The objective of the sub-control center is to make the load follow the received load plan by coordinated charging control of PEVs. Sub-control centers can take different existing coordinated charging methods to control PEVs, no matter these methods are centralized or decentralized. By using the idea of hierarchical control and combining different coordinated charging methods together, the proposed flexible method can control massive PEVs spread in vast areas for load valley filling.
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