科研之友
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摘要
In the multi-terminal flexible dc grid, it is important for the healthy network to ride through the dc fault. The converters should operate continuously after dc faults, staying unblocked. But the existing selective protection and isolation method may fail to react swiftly enough, because the propagation speed of the dc fault current is extremely fast. This paper discussed the fault current limiting requirements and proposed a calculation method to determine the required dc reactor value, for the purpose of the converter continuous operation during dc faults. On this basis, the bridge-type fault current limiter (FCL) was proposed for using in the dc grid, due to merits including minor negative influence on dc grid normal operation, fast response to dc faults and efficient coordination with the dc circuit breaker (DCCB). The parameter design principle of the bridge-type FCL for dc grid was also discussed. Then the scaled-down dc experiment test circuit was built to verify the working principle and performance of the bridge-type FCL. Finally, the simulation cases based on the PSCAD/EMTDC were carried out to verify the feasibility of the theoretical calculation method and the superiority of the proposed bridge-type FCL for using in the dc grid.
- 出版日期2018-5-29
- 单位天津大学
