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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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基于改进分层有向图的故障诊断方法
, PP. 108-111
Keywords: 火电机组,热力系统,除氧器,故障,sdg,分层有向图,相容支路,分辨率
Abstract:
针对火电机组热力系统内部因果关系复杂、故障诊断系统实时性差以及分辨率低等问题，提出了基于符号有向图（sdg）的分层有向图模型，以及基于改进分层有向图的故障诊断方法，即采用有向图分层策略，使故障源的搜索空间减小；利用故障报警节点回溯路径上的定性关系，搜索相容支路确定故障源候选节点。将分层有向图故障诊断方法应用于某台除氧器的故障诊断，并与传统的sdg故障断方法进行比较，结果表明，分层有向图故障诊断方法的有效节点搜索空间明显小于传统的sdg方法，从而提高了系统的诊断速度；使故障源节点的分辨率达到100%，满足实时性要求。
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