Reliability Evaluation Method for Metro Medium-Voltage Ring-Network Power Supply System
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摘要: 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.
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关键词:
- 中压环网供电系统 /
- 通用性模型 /
- 可靠性评估 /
- Monte Carlo法
Abstract: 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. -
图 1 中压环网供电系统第2分区部分结构
Figure 1. Partial structure of second division in medium-voltage ring-network power supply system
图 5 中压环网供电系统母线区域FTA模型
Figure 5. FTA model of bus area in medium-voltage ring-network power supply system
图 6 不含分区联络开关的供电分区FTA模型
Figure 6. FTA model of power supply area without zoned connection switch
图 7 含有分区联络开关的供电分区FTA模型
Figure 7. FTA model of power supply area containing zone liaison switch
图 8 中压环网供电系统通用性FTA模型
Figure 8. Universal FTA model of medium-voltage ring-network power supply system
图 9 某中压环网供电系统FTA模型
Figure 9. FTA model of some medium-voltage ring-network power supply system
图 10 中压环网供电系统及其各区域不可用度
Figure 10. Unavailability of medium-voltage ring-network power supply system and its regions
表 1 中压环网供电系统设备故障参数
Table 1. Fault parameters of medium-voltage ring-network power supply system
具体设备 失效率 λ/ × 10−6 修复率 μ 中压断路器 C1～C52 0.285 1/12 分区联络开关 QF1～QF2 1.784 1/12 主变电所中压母线 B131～B142 0.024 1/14 主变电所母联开关 K13～K14 2.511 1/12 牵引变电所母线 B11～B122 20.550 1/14 牵引变电所母联开关 K1～K12 1.784 1/12 中压电缆 D1～D24 21.000 1/14 
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表 2 中压环网供电系统故障指标统计表
Table 2. Fault index statistics of medium-voltage ring-network power supply system
可靠性指标 tMTTR/h tMTBF/（× 106 h） A′/ × 10−6 A/% 中压环网
供电系统13.712 0 36.258 37.818 99.996 0 母线区域 13.993 6 2.027 6.903 99.999 3 供电分区 13.519 8 40.578 29.984 99.997 0 第 1、4 分区 13.538 2 58.685 23.064 99.997 6 第 2、3 分区 13.557 1 1.931 8.654 99.999 1 Ⅰ型连接 8.143 8 0.682 0.159 99.999 9 Ⅱ型连接 13.718 6 62.039 22.205 99.997 8
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