방사형 MVDC 배전계통에서 사고구간 분리를 위한 클램핑 장치의 구성 및 동작 특성에 관한 연구

다국어 초록 (Multilingual Abstract)

When a fault in secondary feeder is occurred in MVDC distribution system, the operation method of protection coordination is required to minimize interruption region in primary feeder, which can operate the protection devices in secondary feeder before the shut-down of the main converter. Therefore, this paper presents fault current clamping devices to limit the fault current in order to prevent shut down of main converter in radial-type MVDC distribution system. The proposed device, which is composed of main path, current clamping path and so on, has functions to rapidly clamp the fault-current within few micro-seconds using semiconductor switches. And also, the proposed device is installed in both main converter and section converter, its operation mechanism is categorized into 4 operation modes such as initial mode, auxiliary mode, main mode and restoration mode. From the simulation results based on modeling of fault current clamping devices using PSCAD/EMTDC, it is confirmed that the proposed fault-current clamping device is a useful tool to isolate fault section by preventing shut-down of main converter and securing operation time for protection devices in secondary feeder.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 방사형 MVDC 배전계통의 운용특성
• 3. MVDC용 사고전류 클램핑 장치의 구성 및 동작모드
• 4. PSCAD/EMTDC를 이용한 MVDC용 사고전류 클램핑 장치의 모델링
• 5. 시뮬레이션 결과 및 분석
• 6. 결론
• References

참고문헌 (Reference)

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