柔性直流输电系统中IGBT阀的故障诊断方法

发布时间：2018-02-22 19:45

本文关键词： 柔性直流输电 IGBT阀开路故障诊断短时傅里叶变换　出处：《电工技术学报》2014年08期 　论文类型：期刊论文

【摘要】：基于两电平VSC-HVDC系统拓扑图,分析了IGBT阀开路故障时交流侧三相电流的变化情况,得到了故障相电流直流分量的变化规律,进而研究了系统传输功率突变对三相交流电流基波分量相位的影响,从而提出一种运算简便且快速的故障阀定位方法。该方法首先根据各相电流基波分量相位差判断系统状态,在排除功率突变的前提下再以直流分量标幺值为诊断变量对故障元件进行定位。最后模拟系统潮流反转后某IGBT阀发生失效开路故障的情况,利用所提出的方法进行故障诊断,结果表明该方法可快速准确的确定故障位置,并能避免因功率突变而引起的误诊问题。
[Abstract]:Based on the topology diagram of two-level VSC-HVDC system, the variation of AC side three-phase current during the open-circuit fault of IGBT valve is analyzed, and the variation law of DC component of fault phase current is obtained. Furthermore, the influence of the sudden change of system transmission power on the phase of three-phase AC current fundamental wave component is studied, and a simple and fast fault valve location method is proposed. The method first judges the system state according to the phase difference of each phase current fundamental wave component. On the premise of excluding the power mutation, the DC component is used as the diagnostic variable to locate the fault element. Finally, the failure open circuit fault of a IGBT valve after power flow reversal is simulated, and the fault diagnosis is carried out by using the proposed method. The results show that this method can quickly and accurately determine the fault location and avoid misdiagnosis caused by power mutation.
【作者单位】：西安理工大学自动化与信息工程学院;西安科技大学通信与信息工程学院;国家电网公司西北分部;
【基金】：教育部高等学校博士学科点基金(20126118110009) 陕西省教育厅科研计划(11JK1012,11JK1019) 西安科技大学培育基金(201163)资助项目
【分类号】：TM721.1

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