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Low-loss bidirectional solid-state circuit breakers with reliable breaking capability for protecting DC microgrids

Wang, Yufeng, Wang, Sheng ORCID:, Ugalde Loo, Carlos ORCID:, Ming, Wenlong ORCID: and Li, Weiling 2023. Low-loss bidirectional solid-state circuit breakers with reliable breaking capability for protecting DC microgrids. IEEE Transactions on Power Electronics 38 (12) , pp. 16118-16129. 10.1109/TPEL.2023.3313985

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Silicon-controlled rectifier-based dc solid-state circuit breakers (SCR-SSCBs) have received an increased attention for their ease of control and high efficiency, but their considerable conduction losses remain a major disadvantage. This paper presents a new bidirectional SCR-SSCB topology which reduces the conduction losses by ∼50%, with the loss reduction attributed to an inductor being eliminated from the main circuit during normal operation. This is achieved by conducting current through one semiconductor switch instead of two as in conventional devices. In addition, the presented topology enhances the reliability of protection by enabling a controlled interruption of short-circuit faults, in which fault interruption is not affected by the parameters of external systems to which the circuit breaker is connected to. A second topology which reduces the size of the capacitors in the commutating circuit is also introduced. A detailed analysis of the operating principle of the two novel topologies is presented. Recommendations supported by mathematical modeling are provided for selecting the relevant components of the devices. The performance of the two topologies was verified through simulation and experimental tests.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers
ISSN: 0885-8993
Funders: EPRSC
Date of First Compliant Deposit: 12 September 2023
Date of Acceptance: 2 September 2023
Last Modified: 17 Dec 2023 04:36

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