Proactive Thyristor-Based DC Solid-State Circuit Breaker

Reza Kheirollahi, Shuyan Zhao, Yao Wang, Hua Zhang, Fei Lu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper introduces a new proactive solid-state circuit breaker (P-SSCB) for direct current (dc) medium voltage applications. The P-SSCB aims to apply high-power rating thyristors while achieving a fast response speed and high efficiency. To manually turn off thyristors, a complimentary commutation technique is used; meanwhile, full-controlled switches are employed in the auxiliary branch to minimize the reaction time interval. To implement the complementary commutation and achieve a reliable turn-off process in the main thyristor, the injection capacitor in the auxiliary branch is charged by the dc system. The charging process of the injection capacitor is controlled by a thyristor, which helps to obtain a fast and reliable re-closing and re-breaking. During fault current interruption, the injection capacitor is prevented from being reversely charged using an anti-parallel diode to facilitate using polar capacitors. The proposed P-SSCB is validated in a medium-voltage dc test setup by experiments of 1.5 kV/265 A. The results show that the peak voltage across the main and auxiliary branches reaches 2895 V and 2852 V, respectively.

Original languageEnglish (US)
Title of host publicationAPEC 2023 - 38th Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781665475396
StatePublished - 2023
Event38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023 - Orlando, United States
Duration: Mar 19 2023Mar 23 2023

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC


Conference38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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