基于受端供电可靠性的检修策略分析

Maintenance Strategy Analysis Based on Power Supply Reliability of Demand Side

为便于分析例行停电检修对受端可靠性的影响,将供电网简化为单电源供电、双电源完全冗余供电和双电源不完全冗余供电3种类型,将电源端的所有供电设备等值为一个逻辑设备,并假设其可靠度服从指数分布。在此基础上,提出了一套受端供电可靠性的分析方法。应用该方法,分析了更换/检修时间比、例行停电检修时间、设备故障率、检修效果等对受端供电中断时间的影响。分析结果表明,若不考虑计划停电和非计划停电的差异,对于单电源或双电源不完全冗余供电的情形,不进行例行停电检修时受端供电中断时间最小;对于双电源完全冗余供电的情形,仅对更换/检修时间比较大、故障率较高的设备,才比较适宜安排例行停电检修。

In this paper,for analyzing the influence of routine power-off maintenance on demand side reliability,the power supply grid is simplified to three types,namely single power supply,duplicate fully redundancy power supply and duplicate incomplete redundancy power supply.During the analysis of the influence of routing power-off maintenance on power supply reliability at receiving end,all power supply equipments at power supply side are equivalent to a logical one and it is assumed that the reliability obeys exponential distribution.On this basis,a method to analyze power supply reliability at receiving end is proposed.The influences of the ratio of replacement time to maintenance time,routine power-off maintenance time,equipment fault rate,maintenance effect and so forth on interruption time of demand side power supply are analyzed.Analysis results show that not considering the difference between schedule outage and non-plan outage,for the occasion of single power supply or duplicate incomplete redundancy power supply,the interruption time of demand side power supply will be the shortest without implementing routine power-off maintenance;for the occasion of duplicate fully redundancy power supply,the routine power-off maintenance is more suitable,especially for equipment with bigger replacement/maintenance time ratio or higher fault rate.