Asymmetric Fault Propagation Mechanism on AC Side of Hybrid Microgrid And Suppression Methods

The analysis of asymmetric fault propagation mechanism on AC side and the study of its suppression methods are very important for the safe and stable operation of AC/DC hybrid microgrid. In this paper, the influence of asymmetric short-circuit fault on DC power and electricity is analyzed. On this basis, a compensation control strategy of negative sequence zero-sequence voltage is proposed to suppress the transmission of this type of fault. Then a hybrid micro-grid model using the control strategy of "network-network" interconnected converter is built on the simulation software PSCAD/EMTDC, which verifies the correctness of the above fault analysis and the effectiveness of the improved control strategy.1