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Engineering Application of Three-terminal Hybrid DC Circuit Breaker
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1. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China; 2. State Key Laboratory of Control and Simulation of Power System and Generation Equipments, Tsinghua University, Beijing 100084, China; 3. Advanced DC Power Center, Energy Internet Research Institute, Tsinghua University, Beijing 100084, China; 4. Zhuhai Power Supply Bureau of Guangdong Power Grid Co., Ltd., Zhuhai 519000, China

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    Abstract:

    The project of Tangjiawan three-terminal flexible DC distribution network in China successfully applies the first ±10 kV three-terminal hybrid DC circuit breaker all over the world, which can realize the contact and fault isolation of multi-terminal converter stations, thus ensuring safe and reliable operation of the distribution network. In this paper, the topology structure, working principle and technical parameters of the three-terminal hybrid DC circuit breaker are proposed for the fault isolation requirements of the three-terminal flexible DC distribution network in Tangjiawan. Furthermore, the engineering prototype of the three-terminal DC circuit breaker is developed and the current breaking test is carried out. The test results show that the engineering prototype of the three-terminal hybrid DC circuit breaker can interrupt the 10 kA fault current within 2. 7 ms. Finally, the three-terminal DC circuit breaker is installed in the project of Tangjiawan three-terminal flexible DC distribution network, and three key tests are carried out, including online input, online quit and current breaking tests of three-terminal system. The test results show that the three-terminal DC circuit breaker is in good condition, and its function and performance can meet the requirements of engineering design and operation.

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QU Lu, YU Zhanqing, CHEN Zhengyu,et al.Engineering Application of Three-terminal Hybrid DC Circuit Breaker[J].Automation of Electric Power Systems,2019,43(23):141-146.DOI:10.7500/AEPS20190509005

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History
  • Received:May 09,2019
  • Revised:October 31,2019
  • Adopted:October 06,2019
  • Online: October 29,2019
  • Published: