Interference Suppression of Circulating Current Fluctuation Based on Equivalent Input Disturbance in Parallel Inverters

Abstract

The circulating current in the microgrid inverter parallel system has an impact on how well it functions, and frequent fluctuations in the circulating current will compromise the microgrid's stability. A multi-inverter parallel circulating current suppression technique based on equivalent-input-disturbance (EID) is developed in order to address the poor effect of restricting the circulating current when the double closed-loop PI control is disrupted. First, the inverter's parallel structure model is established, and the circulating current mechanism is examined. One type of disturbance is the fluctuation in the circulation current. EID technique suppresses circulating current fluctuation, which in turn suppresses circulating current effect. Finally, the effectiveness of the proposed control strategy in the case of parallel inverter is verified by MATLAB/SIMULINK simulation.