基于双树复小波变换的配电网故障选线  

Fault Line Selection for Power Distribution Network Based on Dual-tree Complex Wavelet Transform

作　　者：刘洋[1] 郭威[1] 邢春阳[1] 鞠默欣[2] 庞博[3] 杨薏霏 

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]吉林省电力有限公司电力科学研究院,吉林长春130000 [3]吉林省电力有限公司白城供电公司,吉林白城137000 [4]吉林省电力有限公司长春供电公司,吉林长春130000

出　　处：《广东电力》2016年第12期121-126,共6页Guangdong Electric Power

摘　　要：在对配电网故障信号进行处理的过程中,为了减少噪声的影响,将应用于心电信号处理的双树复小波变换用于配电网故障选线,并结合暂态小波能量的改进算法,提出了一种小电流接地系统故障选线新方法。首先将各线路暂态零序电流进行双树复小波变换,得到小波分解系数并计算小波能量。根据电压峰值附近故障和过零点附近故障的信号能量谱特征,通过设定阈值分别比较小波高频能量和低频能量。利用Simulink进行大量仿真,结果表明:与传统离散小波变换相比,双树复小波变换去噪更彻底,而且不受故障合闸角、过渡电阻及系统运行方式等因素的影响,可以快速准确选线。In the process of processing faulted signals of the power distribution network, in order to reduce influence of noise, dual-tree complex wavelet transform generally applied in electrocardiosignal processing is used for fault line selection, and a kind of new method for fault line selection for small current grounding system is presented by combining the improved algorithm for transient wavelet energy. It firstly conducts dual-tree complex wavelet transform on transient zero current of each feeder so as to obtain decomposition coefficient and work out wavelet energy. According to energy spectrum character- istics of faulted signals near to voltage peak value and zero crossing point, it respectively compares high frequency energy and low frequency energy of wavelet by setting threshold values. Simulink is used for simulation and the results indicate that com- pared with traditional disperse wavelet transform, dual-tree wavelet transform is more thoroughly useful to denoise and will not be affected by faulted closing angle, transition resistance and system running mode, and so on, which means rapid and accurate line selection.

关 键 词：配电网 故障选线 信号处理 双树复小波变换 暂态小波能量 

分 类 号：TM726[电气工程—电力系统及自动化]