Circuit Modeling and Experimental Validation of a Bidirectional Z-Source Circuit Breaker Based on Coupled Inductors

DC microgrids have attracted increasing attention due to their high efficiency, simple control, and high power quality; however, circuit fault protection remains a technical challenge. Z-source circuit breakers (ZSCBs) have provided a promising solution with fast, autonomous, and arcless fault clear...

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Bibliographic Details
Published in:	IEEE transactions on industrial electronics (1982) 2024-06, Vol.71 (6), p.1-10
Main Authors:	Zhou, Zhongzheng, Fei, Yuqing, Li, Yao, Wang, Yufeng, Liu, Yuyang, Li, Weilin
Format:	Article
Language:	eng
Subjects:	Circuit breakers coupled inductors DC microgrids Distributed generation Inductors mathematical model Mathematical models Power flow power system protection Z-source circuit breakers
Online Access:	Get full text
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Summary:	DC microgrids have attracted increasing attention due to their high efficiency, simple control, and high power quality; however, circuit fault protection remains a technical challenge. Z-source circuit breakers (ZSCBs) have provided a promising solution with fast, autonomous, and arcless fault clearances. To further provide bidirectional operation capability and enhanced performance, a bidirectional ZSCB based on coupled inductors is proposed and well designed in this paper. It can offer bidirectional power flow and fault disconnections in a compact size. The working principle and circuit analysis are elaborated with mathematical models, which cover the entire fault-clearing transient and can provide insightful guidelines for breaker design and component sizing. Moreover, a crowbar-type switch enabling manual tripping operation of the proposed ZSCB is integrated. Finally, Saber-based simulations verify the effectiveness of the models and the design, which are further validated by a 48 V/230 W laboratory prototype.
ISSN:	0278-0046 1557-9948