Hybrid Z-Source Circuit Breaker with Thomson Coil for MVDC

Hyun-Seung Lee, Hyung-Wook Kang, Jae-Ho Rhee () and Kun-A Lee ()
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Hyun-Seung Lee: Department of Social Safety System Engineering, Hankyoung National University, 327 Chungang-ro, Anseong-si 17579, Gyeonggi-do, Republic of Korea
Hyung-Wook Kang: Department of Social Safety System Engineering, Hankyoung National University, 327 Chungang-ro, Anseong-si 17579, Gyeonggi-do, Republic of Korea
Jae-Ho Rhee: Department of Electrical Engineering, Bucheon University, 25 Sinheung-ro, 56 Beon-gil, Buchen-si 14632, Gyeonggi-do, Republic of Korea
Kun-A Lee: School of Social Safety System Engineering, Research Center for Safety and Health, Hankyoung National University, 327 Chungang-ro, Anseong-si 17579, Gyeonggi-do, Republic of Korea

Energies, 2023, vol. 17, issue 1, 1-16

Abstract: Hybrid circuit breakers are the most promising circuit breakers among DC circuit breakers. Conventional hybrid circuit breakers complete fault current isolation by converting current to IGBT when fault current occurs. However, in this case, the fault current continues to increase, so the IGBT must be large enough to withstand this current. In addition, in the case of a method of detecting and operating a fault, a delay time of up to hundreds of microseconds occurs, and in a hybrid circuit breaker, this delay time is a very large value. To solve this problem, this paper proposes a hybrid Z-source circuit breaker that operates without delay for low-impedance faults. The proposed breaker is designed to reduce stress on IGBTs and mechanical switches by generating a current zero crossing, as well as to enable the breaker to trip quickly in high-risk cases such as low-impedance fault circuits. Due to the limited environment of the laboratory, we performed 600 V fault isolation experiments. As a result of the experiment, it was confirmed that the proposed circuit breaker successfully isolated the fault within 1.6 ms. The current limiting feature of the Z-source appears to reduce stress on the IGBTs and MOVs used, and it allows for faster fault isolation.

Keywords: hybrid circuit breaker; Z-source circuit breaker; Thomson coil actuator (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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