引用本文: | 刘星,姜睿智,宋国兵,等.利用电流故障特征的大功率整流装置故障在线诊断方法[J].电力系统保护与控制,2016,44(22):166-173.[点击复制] |
LIU Xing,JIANG Ruizhi,SONG Guobing,et al.An on-line fault diagnosis method for power rectifier device based on fault current characteristic[J].Power System Protection and Control,2016,44(22):166-173[点击复制] |
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摘要: |
针对大功率整流装置单管直通、开路及单相交流进线开路等三种单元件故障,分析了故障电流特征,提出了一种根据电流故障特征在线诊断故障的方法。单管直通时,根据计算得到的直流电流理论值将大于直流电流实测值,且故障相与非故障相的直流分量符号相反,可确定故障元件所在相别,再根据故障相直流分量正负可确定故障元件所在共阳或共阴组别。对单管开路和单相交流进线开路,若滑窗计算得到相电流直流分量持续大于某一整定值时判定为单管开路故障,再通过直流分量极性确定故障元件所在组别;若相电流直流分量先增大超过某一整定值后再减少至0,判定为单相交流进线开路,根据故障相电流基波幅值最小确定开路相别。仿真结果表明,该方法可快速诊断出故障,适用于多重化并联整流电路的故障诊断场合,具有一定的理论与实用价值。 |
关键词: 电流故障特征 单管直通故障 单管开路故障 单相交流进线开路故障 多重化并联整流装置 |
DOI:10.7667/PSPC151830 |
投稿时间:2015-10-17修订日期:2015-11-26 |
基金项目:国家自然科学基金(51177128) |
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An on-line fault diagnosis method for power rectifier device based on fault current characteristic |
LIU Xing,JIANG Ruizhi,SONG Guobing,WANG Xiaobo,LIU Peiyao,LI Duanzhen,YANG Yuanhang |
(XJ Electric Co., Ltd., Xuchang 461000, China;School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China) |
Abstract: |
This paper analyzes the current characteristics of short circuit and open circuit of single thyristor as well as the current characteristics of open circuit of AC line, and comes up with a new on-line fault diagnosis method for the rectifier device. For the single thyristor short circuit, the theoretical DC value calculated using the measured AC current will be greater than the real-time DC value measured, and the DC components of the fault phase and non-fault phase are opposite in sign, which can be used to locate the fault thyristor. In the open circuit situation, if the DC component value of current calculated by slide window is continually larger than the threshold value, it is single thyristor open circuit, and the fault thyristor can be identified by the sign of fault phase DC component. If the DC component value of current firstly increases above a certain value and then reduces to 0, the fault can be identified as AC line open circuit, and the fault phase can be located with the help of minimum amplitude of the fundamental wave. Simulation results show that the method can diagnose the faults quickly and accurately and that it can also be applied to the fault diagnosis of multiple parallel rectifiers. So it has theoretical and practical value. This work is supported by National Natural Science Foundation of China (No. 51177128). |
Key words: fault current characteristics single thyristor short circuit single thyristor open circuit single phase AC line open circuit multiple parallel rectifiers |