Abstract
By analyzing the current equivalent circuit of unbalanced load, the mathematical model of the three-phase four-wire energy storage converter in the dq0 coordinate system is established. Comparing the characteristics of the Decouple Double Synchronous Reference Frame (DDSRF)and the Delay Signal Cancellation (DSC) to decompose the positive and negative sequence line parameters, the DSC with faster dynamic response is selected for the practical application effect. Compensate the decomposed zero sequence component and negative sequence component. The DC component is adjusted by Proportional Integral (PI) controller, and the AC component is controlled by Proportional Resonance controller (PR) to achieve no static error. Finally, a split capacitive energy storage converter system is built in Matlab/Simulink for simulation verification, which proves that the control strategy can effectively compensate the current asymmetry caused by load unbalance.
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