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Electric vehicles (EVs) can behave as distributed energy storage devices for providing on-demand smart grid support service, that is an emerging Vehicle-to-Grid (V2G) technology. A high-performance and easy-implementation current control strategy for V2G Three-phase four-leg inverter with LCL filter is proposed. It consists of a deadbeat (DB) controller and a paralleled repetitive controller (RC). The DB controller is based on weighted average inductor current (WAIC) scheme, which simplifies the third-order LCL filter to be an equivalent 1st order L filter. The stability of the DB controlled inverter with the unmodelled system time delay is analyzed. DB controller is of very fast response and easy implementation, but is not immune to system time delay and various uncertainties. To overcome the disadvantages, a plug-in RC is added to reinforce the DB controller to remove harmonic distortion from the feed-in current in the presence of parameter uncertainties. A lab prototype of 10kW grid-connected threephase four-leg inverter has been built up to validate the proposed current control strategy. The simulations and experiments are provided to demonstrate the validity of the proposed control strategy. Index Terms-V2G, weighted average inductor current, three-phase four-leg inverter, deadbeat control, repetitive control, stability analysis. I. INTRODUCTION Vehicle-to-grid (V2G) technology allows electric vehicles (EVs) to act as distributed energy storage devices. It can provide smart grid support services by "valley filling" and "peak shaving" [1-4]. Fig. 1 shows a V2G application example, where the EVs can improve the efficiency, stability and economy of the grid[5, 6].

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