| 引用本文: | 姚李孝,赵化时,柯丽芳,刘家军.基于小波相关性的配电网单相接地故障测距[J].电力自动化设备,2010,(1): |
| .Single-phase grounding fault locating based on wavelet correlation for distribution network[J].Electric Power Automation Equipment,2010,(1): |
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| 摘要: |
| 分析了配电网络发生单相接地故障后故障行波的传输模型,由于配电网暂态行波信号微弱,提出了利用小波变换后图形相关性方法,检测行波波头的时间差。首先对暂态电流做多次小波变换,对小波变换后的图形去除噪声,然后提取出该图形中的峰谷波形,利用第1个峰谷波形作为基准量,后续的波形依次与第1个波形做相关性分析,找出与第1个峰谷波具有最大相关的波形,利用此波形和第1个波形的时间差作为测距的依据,通过A型行波测距算法算出故障距离。ATP仿真结果表明,采用小波变换后的波形相关性算法可将测距误差限制在±100m的范围内;而且,利用该算法可以消除过渡电阻和故障发生在电压过零导致的测距结果失真。 |
| 关键词: 配电网 小波变换 相关性原理 行波 故障测距 |
| DOI： |
| 分类号:TM862 |
| 基金项目: |
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| Single-phase grounding fault locating based on wavelet correlation for distribution network |
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YAO Lixiao ZHAO Huashi KE Lifang LIU Jiajun
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| Abstract: |
| The transfer model of travelling wave is analyzed for the single-phase grounding fault of distribution network.Because the transient travelling wave signal is very weak,an algorithm that uses wavelet transform and graphic correlation to detect the time difference of wave heads is proposed.The transient zero sequence current is wavelet-transformed several times to remove the noises in the graphics after wavelet-transform.With the first peak-valley figure as reference,the correlation analysis is carried out f... |
| Key words: distribution network wavelet transform correlation theory travelling wave fault locating |
