基于馈线分块等值的中压配电网可靠性评估改进FMEA法

Improved FMEA method for reliability evaluation of mid-voltage distribution system based on divided feeder equivalence

以契合配电网运行实际的故障模式后果分析法(FMEA)为基本原理,结合近年来应用较为广泛的等值法,提出了一种以馈线为对象的配电网可靠性分块算法。该算法以线路块和负荷块为分析元进行等值,减少了以往以元件为分析元时的繁琐计算;而后对等值后的模块进行故障模式后果分析,由此计算出各个负荷点的可靠性指标并进一步得到系统的可靠性指标。该法考虑了装置不可靠动作、备用电源、计划检修等多种情况。通过一条实际馈线的计算,证明了该方法是一种有效的配电网可靠性解析算法,更能适应自动化开关普及的系统。

A distribution system reliability evaluation method based on FMEA（Failure Modes and Effects Analysis） is presented,which combines with widely- used equivalence method and divides feeder into line sections. Instead of components,it takes line sections and load sections as analytic elements for equivalence to simplify the calculation. The failure mode and effect analysis is carried out for these equivalent mathematic models to evaluate the reliability indexes of load points and whole system. Different conditions are considered,such as improper operations of automatic equipment,backup power supply and scheduled maintenance. Example calculation of a real feeder verifies it an effective analytic arithmetic of distribution system reliability,more suitable for those systems with diffusive automatic switches.