Combining the advantages of the ip-iq detection method based on instantaneous reactive power theory and the closed-loop adaptive detection method based on traditional power theory, a new detection method is designed, which has good robustness and dynamic response speed. At the same time, since the inverter adopts a three-bridge capacitor midpoint structure, the stability of its DC side voltage and the voltage-balanced control of the upper and lower capacitors are analyzed, and combined with reactive and harmonic current detection to form a double closed-loop structure to further enhance the compensation effect. Then, the synthesis of the command current and its tracking control are briefly described. Finally, the system is simulated using Matlab/Simulink to verify the correctness and effectiveness of the method.
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