Research on the Circulating-Current Suppression of Parallel Inverters Based on Droop Control

摘要

As the interface of distributed generation and mi-cro-grid, the control performance of inverter is directly related to the performance of micro-grid. In this paper, the circulating-current of parallel inverters with the method of droop control is studied. After calculating the circulating-current with the equivalent impedance of the inverters and analyzing the influence of the difference between equivalent impedance on the cir-culating-current, a method of circulating-current suppression is proposed and presented. Through the simulation with the module in Matlab/Simulink and the implement with the parallel three-phase inverters platform, the correctness of the analysis and the feasibility and effectiveness of the proposed control strategy are verified.