DC Solid-State Circuit Breakers with Two-Winding Coupled Inductor for DC Microgrid

Jung-min Park, Hyung-jun Byun, Sung-hun Kim, Si-hwan Kim and Chung-yuen Won
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Jung-min Park: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Hyung-jun Byun: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Sung-hun Kim: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Si-hwan Kim: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Chung-yuen Won: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea

Energies, 2021, vol. 14, issue 14, 1-13

Abstract: Ensuring a protection scheme in a DC distribution system is more difficult to achieve against pole-to-ground faults than in AC distribution system because of the absence of zero crossing points and low line impedance. To complement the major obstacle of limiting the fault current, several compositions have been proposed related to mechanical switching and solid-state switching. Among them, solid-state circuit breakers (SSCBs) are considered to be a possible solution to limit fast fault current. However, they may cause problems in circuit complexity, reliability, and cost-related troubles because of the use of multiple power semiconductor devices and additional circuit configuration to commutate the current. This paper proposes a SSCB with a coupled inductor (SSCB-CI) that has a symmetrical configuration. The circuit is comprised of passive components like commutation capacitors, a CI, and damping resistors. Thus, the proposed SSCB-CI offers the advantages of a simple circuit configuration and fewer utilized power semiconductor devices than the other typical SSCBs in the DC microgrid. For the analysis, six operation states are described for the voltage across the main switches and fault current. The effectiveness of the SSCB-CI against the short-circuit fault is proved via simulation and experimental results in a lab-scale prototype.

Keywords: solid-state DC circuit breaker; coupled inductor; pole-to-ground fault protection; DC microgrid protection (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: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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