Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Current Limiting and Interrupting Operation of Hybrid Self-Excited Type Superconducting DCCB

  • Choi, S.J. (Soongsil University) ;
  • Lim, S.H. (Soongsil University)
  • Received : 2018.11.16
  • Accepted : 2018.12.25
  • Published : 2018.12.31
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Abstract

Currently, the development of industry makes needs larger electric supply. Providers must consider the efficiency about losses and reliability of the system. In this case, DC power system can save electrical energy; long-distance transmission line losses. Relevance to switch technology with a voltage-source converter (VSC) in AC-DC conversion system have been researched. But, protection device of DC-link against fault current is still needed to study much. VSC DC power system is vulnerable to DC-cable short-circuit and ground faults, because DC-link has a huge size of capacitor filter which releases extremely large current during DC faults. Furthermore, DC has a fatal flaw that current zero crossing is nonexistence. To interrupt the DC, several methods which make a zero crossing is used; parallel connecting self-excited series LC circuit with main switch, LC circuit with power electronic device called hybrid DC circuit breaker. Meanwhile, self-excited oscillator needs a huge size capacitor that produces big oscillation current which makes zero crossing. This capacitor has a quite effective on the price of DCCB. In this paper, hybrid self-excited type superconducting DCCB which are using AC circuit breaker system is studied by simulation tool PSCAD/EMTDC.

Keywords

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Fig. 1. Concept diagram for DC circuit breaker.

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Fig. 2. Existing model topology: conventional self-excited type superconducting DCCB.

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Fig. 3. Proposed model topology: self-excited type superconducting DCCB with auxiliary circuit.

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Fig. 4. Operating order signal of arc, SC resistance and IGBT.

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Fig. 5. Current operating waveform on conventional self-excited type superconducting DCCB.

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Fig. 6. Current operating waveform on proposed hybrid self-excited type superconducting DCCB.

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Fig. 7. Equivalent Circuit of Simulation Circuit of Hybrid Self-Excited Type Superconducting DCCB.

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Fig. 8. Superconducting element current waveform due to CLR resistance variation

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Fig. 9. Superconducting element power burden due to CLR resistance change

TABLE 1 PARAMETERS OF ARC AND SUPERCONDUCTING ELEMENT MODEL.

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