多端口直流断路器可靠性评估模型及其应用

Reliability evaluation model of multi-terminal DC circuit breaker and its application

多端口直流断路器(MTCB)是未来实现多端换流站联络及故障快速隔离的核心设备,其可靠性直接影响多端直流配电网的可靠性水平。首先分析了MTCB拓扑结构及工作原理。然后以珠海“互联网+”示范工程中应用的三端口混合式直流断路器为例,基于工程可靠性原理并考虑器件冗余建立MTCB可靠性评估模型。然后分析了MTCB对多端直流配电网可靠性的影响。最后基于唐家湾三端直流配电网结构进行算例分析,计算了MTCB在不同设计模式、冗余分析下的可靠性情况,进行了MTCB对多端直流配电网可靠性的影响分析及灵敏度分析,验证了所提模型的正确性和有效性。

MTCB(Multi-Terminal DC Circuit Breaker)is the core equipment to realize the connection and fault isolation of multi-terminal converter station in the future,and its reliability directly affects the reliability level of multi-terminal DC distribution network.Firstly,the topology and working principle of MTCB are analyzed.Then,taking the three-terminal hybrid DC circuit breaker in Zhuhai“Internet plus”demonstration project as an example,based on the engineering reliability principle and considering the redundancy level of devices,MTCB reliability evaluation model is established.The influence of MTCB on the reliability of multi-terminal DC distribution network is analyzed.Finally,based on the structure of Tangjiawan three-terminal DC distribution network,the reliability of MTCB under different design modes and redundancy levels is calculated.The influence analysis and sensitivity analysis of MTCB on the reliability of multi-terminal DC distribution network are carried out,and the correctness and effectiveness of the proposed model are verified.