Novel Bidirectional O-Z-Source Circuit Breaker for DC Microgrid Protection

DC microgrids that feature a simple and efficient integration with renewable energy sources and energy storage elements have drawn increasing attention in industrial applications. In this article, a bidirectional Z -source circuit breaker with an O-shaped impedance network (abbreviated as O- Z -sour...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2021-02, Vol.36 (2), p.1602-1613
Main Authors: Zhou, Zhongzheng, Jiang, Jiayan, Ye, Shu, Yang, Dirui, Jiang, Jianguo
Format: Article
Language:English
Subjects:
Capacitors
Circuit breakers
Circuit design
Circuit faults
circuit topology
Distributed generation
Energy storage
Industrial applications
mathematical model
Microgrids
Power efficiency
Power flow
power system protection
Renewable energy sources
Snubbers
thyristor circuits
Thyristors
Topology
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Summary:DC microgrids that feature a simple and efficient integration with renewable energy sources and energy storage elements have drawn increasing attention in industrial applications. In this article, a bidirectional Z -source circuit breaker with an O-shaped impedance network (abbreviated as O- Z -source circuit breaker) is proposed to guarantee the reliable operation of dc microgrids. By a simplified structure, the O- Z -source circuit breaker allows bidirectional power flow with fewer components compared with conventional Z -source circuit breakers. Increased operating power efficiency can also be obtained from the novel topology. Based on detailed mathematical models, design equations are derived for sizing the components in the O- Z -source circuit breaker. Moreover, a new concept of equivalent capacitance that is useful for estimating the minimum detectable fault ramp rate for Z -source circuit breakers is presented. A discussion over snubber circuits of the proposed breaker is also included. Finally, a laboratory prototype has been built to verify the analysis and design the O- Z -source circuit breaker.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2020.3006889