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电网技术  2015 

UHVDC系统故障树分析误差及灵敏度分析

DOI: 10.13335/j.1000-3673.pst.2015.05.010, PP. 1233-1239

Keywords: 特高压直流输电,故障树,误差分析,灵敏度分析,可靠性

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Abstract:

采用故障树(faulttreeanalysis,FTA)法分析UHVDC系统可靠性及灵敏度。考虑多状态元件同站双极互为备用逻辑关系,建立所有故障方式的故障树。基于串、并联结构,分别建立FTA和状态空间(statespace,SS)可靠性分析模型。发现FTA误差,源于对串联系统不当引入多个元件同时故障状态。分别采用FTA和SS法计算UHVDC系统状态概率和灵敏度,量化前者误差。结果证实FTA得到的不可用率>确实较SS法偏高,误差与元件个数及元件可用度有关。发现系统故障概率对同一元件修复率和安装率的绝对灵敏度之比,为其安装率和修复率之比的平方,同一元件所有参数相对灵敏度之和为0,据此可大幅降低灵敏度分析计算量。

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