Comparison of Electrical Fault Response In Z-source Circuit Breaker Topologies For D.C. Microgrid Applications

Abstract

ABSTRACT : With the increasing prominence of DC microgrids in recent years, addressing the challenges faced by DC microgrid protection systems, particularly in relation to the absence of current zero-crossing and arc mitigation during circuit switching, has become crucial. In this regard, Z-source circuit breakers and their modifications have emerged as promising solutions for medium-voltage DC microgrid protection. These devices offer natural commutation, simple control, low losses, and high fault-clearing speed. This project select and compare different Z source topologies and their modifications for both unidirectional and bidirectional operation, using comparable performance parameters for medium-voltage microgrid applications. The topologies were simulated using the OpenModelica software to evaluate their functionality and performance.