高压直流换流站的相关失效模式探讨

相关性是系统失效的普遍特征,是系统可靠性分析中不可回避的问题。对高压直流输电系统两端换流站内的主要相关失效模式进行了分类研究,以交流滤波器组、控制保护系统、换流阀系统、平波电抗器等具有代表性的系统为例,根据失效过程的不同特点,分别建立了串联系统、含重复事件的故障树、载荷-性能模型以及马尔柯夫过程等相适应的可靠性分析模型,并给出了相应的系统失效概率计算公式,为高压直流输电系统的可靠性评估提供了有效的模型基础和可行的分析方法。

Discussion on dependent failure modes in HVDC commutation stations

Dependency is a universal characteristic of system failures,and also an inevitable problem in system reliability analysis.This main dependent failure modes in commutation stations of HVDC system are discussed.Using AC filter banks,control system,valve system and smoothing reactors as representative examples,suitable models are established according to different characteristics of these failure modes,such as series system model,fault tree with repeated events,load-property interference model and Markov process.Expressions of system failure rate probabilities are also given for each model.Models and analysis methods proposed in this paper provide an effective scheme of modeling and analysis for reliability evaluation of HVDC transmission systems.This work is supported by the Key Project of the Natural Science Foundation of China(50337010).