地铁中压环网供电系统可靠性评估方法

地铁中压环网供电系统起电能分配及传输作用，结构复杂且设备繁多，分析地铁中压环网供电系统可靠性具有重要意义. 本文通过分析地铁中压环网供电系统的拓扑结构和运行方式，采用分区的思想对中压环网供电系统进行区域化、模块化处理，简化复杂系统并提出系统“最小基本单元”的概念，建立系统可靠性评估通用性模型，并运用序贯Monte Carlo法计算中压环网供电系统可靠性评估指标. 通过算例分析可知，在不考虑系统设备磨损的情况下，当抽样次数为50 000次时，求得某条地铁中压环网供电系统稳态可用度为99.996%，验证了通用性模型的可行性. 

Reliability Evaluation Method for Metro Medium-Voltage Ring-Network Power Supply System

Metro medium-voltage ring-network power supply system has a complex structure and various devices, which plays a crucial role in the distribution and transmission of electric energy. The analysis of metro medium-voltage ring network supply system is of great significance. In the analysis of its network structure and operation mode, the idea of partitioning is adopted to deal with the medium-voltage ring-network power supply system in a regional and module manner. Thus, the complex system is simplified and the concept of the minimum basic unit is proposed. A universal model is established for system reliability assessment and sequential Monte Carlo method is used to calculate system reliability evaluation indexes. The case study shows that, if the wear of the system equipment is ignored, with the sampling number of 50 000, the steady-state availability of the power supply system for ametro medium-voltage ring network is 99.996%, which verifies the feasibility of the universal model.