A Control Method of Inverter to Implement the Three-Phase Current Imbalance Compensation

Xia Zhang


Based on three-phase four-leg inverter structure, a control method of inverter is studied to implement the three-phase current imbalance compensation. The control method of three-phase four-leg inverter is studied for micro grid power quality problems caused by three-phase current imbalance, using positive and negative sequence synchronous rotation coordinate conversion and band-stop filter, the positive sequence , negative sequence and zero-sequence current are separated to be controlled, and three-phase inverter output current follows the command, three-phase current imbalance compensation is realized effectively. Based on theoretical analysis, a simulation model and experimental platform are build, and the feasibility and correctness of the system control methods is verified by simulation and experiments.


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