Decentralized EV charge/discharge control with minimum generation cost

The decentralized control of charge/discharge is much better than the centralized control in computation simplicity and privacy protection. A general flowchart of decentralized charge/discharge control is presented. As the existing decentralized charge/discharge control methods only can suppress load fluctuation, a method based on the Lagrangian relaxation is proposed to realize the coordinated operation between EV (Electric Vehicle) and generator and reduce the generation cost. As the dispatch signals, the dual factors are updated for gradual approaching to the optimal solution of centralized control. Case study of IEEE-RTS1979 verifies that, being more adaptive to EV groups, the proposed method reduces the generation cost obviously; being capable of solving the problem of generation cost minimization with the non-convex and constraint-coupled objective function, the proposed method has larger applications.