An improved deadbeat plus plug-in repetitive controller for three-phase four-leg inverters

An improved deadbeat plus plug-in repetitive control scheme is proposed for grid-connected three-phase four-leg inverters to achieve fast and accurate feed-in grid current tracking. Discrete-time mathematical model of the three-phase four-leg grid-connected inverter is developed. An improved deadbeat (DB) plus plug-in repetitive control (RC) scheme is proposed to reject periodic disturbances while keeping good dynamic response. Simulation results are provided to validate the effectiveness and advantages of the proposed method.

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