Analysis on the Unidirectional DC Circuit Breaker and Protection Strategy
Yang Tian1, Liu Xiaoming1,2, Wu Qi1, Chen Hai2, Li Longnv2
1. School of Electrical Engineering Shenyang University of Technology Shenyang 110870 China; 2. Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tianjin Polytechnic University Tianjin 300387 China
Abstract Hybrid direct current circuit breaker (DCCB) is an important equipment to build flexible DC power grid, but its large use of insulated gate bipolar transistor (IGBT) results in high manufacturing cost. The unidirectional hybrid DC circuit breaker topology was put forward, and the unidirectional protection strategy of multi-terminal direct current (MTDC) grid is explored. Under the premise of ensuring reliability, the unidirectional hybrid breaker requires half the number of required IGBT, which improved the utilization rate of IGBT and effectively reduced the cost. In order to study the performance of unidirectional protection strategy, a three-terminal DC grid is modeled in PSCAD/EMTDC, and simulation tests of isolating different types of short circuit faults are carried out. The results show that the unidirectional hybrid DC circuit breaker can identify the fault current accurately and break the fault line quickly, which proves that its topology structure and protection scheme can meet the requirement of system protection speed and reliability.
Yang Tian,Liu Xiaoming,Wu Qi等. Analysis on the Unidirectional DC Circuit Breaker and Protection Strategy[J]. Transactions of China Electrotechnical Society, 2020, 35(zk1): 259-266.
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2020, Vol. 35 
