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A Study on SFCL with IGBT Based DC Circuit Breaker in Electric Power Grid

  • Bae, SunHo (School of Electrical and Electronic Engineering, Yonsei University) ;
  • Kim, Hongrae (Dept. of Electronic Information Engineering, Soonchunhyang University) ;
  • Park, Jung-Wook (School of Electrical and Electronic Engineering, Yonsei University) ;
  • Lee, Soo Hyoung (Korea Electrotechnology Research Institute (KERI))
  • Received : 2016.11.01
  • Accepted : 2017.07.03
  • Published : 2017.09.01

Abstract

Recently, DC systems are considered as efficient electric power systems for renewable energy based clean power generators. This discloses several critical issues that are required to be considered before the installation of the DC systems. First of all, voltage/current switching stress, which is aggravated by large fault current, might damage DC circuit breakers. This problem can be simply solved by applying a superconducting fault current limiter (SFCL) as proposed in this study. It allows a simple use of insulated-gate bipolar transistors (IGBTs) as a DC circuit breaker. To evaluate the proposed resistive type SFCL application to the DC circuit breaker, a DC distribution system is composed of the practical line impedances from the real distribution system in Do-gok area, Korea. Also, to reflect the distributed generation (DG) effects, several DC-to-DC converters are applied. The locations and sizes of the DGs are optimally selected according to the results of previous studies on DG optimization. The performance of the resistive type SFCL applied DC circuit breaker is verified by a time-domain simulation based case study using the power systems computer aided design/electromagnetic transients including DC (PSCAD/ EMTDC(R)).

Keywords

DC circuit breaker;DC distribution system;Insulated-gate bipolar transistor (IGBT);Non-zero-crossing switching;Superconducting fault current limiter (SFCL)

Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)

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