This paper presents an interconnected converter control strategy for suppressing voltage imbalance in a specific hybrid AC-DC microgrid.This control strategy adopts the positive and negative sequence separation method using a dual synchronous coordinate system.After coordinate transformation,decoupling and low pass filter,the positive and negative sequence components of voltage are extracted;Based on the theory of instantaneous power,the expressions of active and reactive power with positive and negative sequence components are derived,and the positive and negative sequence current references are given to suppress the DC voltage fluctuation and achieve the unit power factor control;then the control of interconnected converter is realized based on the vector control structure.The simulation results in Matlab/Simulink demonstrate the correctness and effectiveness of the proposed control strategy for suppressing voltage imbalance.
AC and DC hybrid microgridvoltage imbalancegrid-connected operationinterconnected converters
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