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A Stable Black-Start Strategy for a Stand-Alone DC Micro-Grid

  • Cha, Jae-Hun ;
  • Han, Yoon-Tak ;
  • Park, Kyung-Won ;
  • Oh, Jin-Hong ;
  • Choi, Tae-Seong ;
  • Ko, Jae-Hun ;
  • MAHIRANE, Philemon ;
  • An, Jae-Yun ;
  • Kim, Jae-Eon
  • Received : 2017.05.15
  • Accepted : 2017.09.09
  • Published : 2018.01.01

Abstract

Unlike an AC system, a DC system does not cause problems with synchronization, stability, reactive power, system losses, and cost. However, more research is still required for the application of DC Systems. This paper proposes a stable black-start strategy for a stand-alone DC micro-grid, which consists of an energy storage system, photovoltaic generator, wind-turbine generator, diesel generator, and DC loads. The proposed method is very important for avoiding inrush current and transient overvoltage in the power system equipment during restoration after a blackout. PSCAD/EMTDC software was used to simulate, analyze, and verify the method, which was found to be stable and applicable for a stand-alone DC micro-grid.

Keywords

LVDC;DC Distribution;DC micro-grid;Blackout;Black-start;Restoration;PSCAD/EMTDC

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Acknowledgement

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