An Optimized Control Method for Four-Leg Inverter

ABSTRACT

This paper studies three-phase four-leg inverter and conducts the system analysis under the situations of balanced and unbalanced load. Based on existing decoupling control method, this paper analyses the principle of decoupling control method and presents a new optimized digital control method. This optimized method uses the last calculation result to compensate for the error and simplifies the control. It only needs to sample the neutral line current whereas the voltage sampling of load is not necessary. This paper conducts simulation and experiment to verify the control method, and the performance is perfect.

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