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A New Reclosing and Re-breaking DC Thyristor Circuit Breaker for DC Distribution Applications

  • Kim, Jin-Young (Department of Electrical Engineering, Pukyong National University) ;
  • Choi, Seung-Soo (Department of Electrical Engineering, Pukyong National University) ;
  • Kim, In-Dong (Department of Electrical Engineering, Pukyong National University)
  • Received : 2016.05.11
  • Accepted : 2016.09.08
  • Published : 2017.01.20

Abstract

The DC circuit breaker is essential for supplying stable DC power with the advent of DC transmission/distribution and sensitive loads. Compared with mechanical circuit breakers, which must interrupt a very large fault current due to their slow breaking capability, a solid-state circuit breaker (SSCB) can quickly break a fault current almost within 1 [ms]. Thus, it can reduce the damage of an accident a lot more than mechanical circuit breakers. However, previous DC SSCBs cannot perform the operating duty, and are not economical because many SCR are required. Therefore, this paper proposes a new DC SSCB suitable for DC grids. It has a low semiconductor conduction loss, quick reclosing and rebreaking capabilities. As a result, it can perform the operating duties of reclosing and rebreaking. The proposed DC SSCB is designed and implemented so that it is suitable for home dc distribution at a rated power of 5 [kW] and a voltage of 380 [V]. The operating characteristics are confirmed by simulation and experimental results. In addition, this paper suggests design guidelines so that it can be applied to other DC grids. It is anticipated that the proposed DC SSCB may be utilized to design and realize many DC grid systems.

Acknowledgement

Supported by : Pukyong National University

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