基于DOA估计的GIL击穿放电定位方法研究

Research on Location Method of GIL Breakdown and Discharge Based on DOA Estimation

针对传统的GIL击穿定位方式测试过程复杂、定位精度较差的问题,采用基于传声器阵列的空间谱估计技术对GIL击穿信号源的位置进行了识别研究。通过连续小波变换对击穿信号进行时频域的联合分析,构建多分辨率时频阵列信号模型并引入到传统MUSIC算法中以提高对GIL击穿信号的DOA估计精度,通过数值模拟对算法的定位效果进行了分析,仿真结果表明结合连续小波变换的MUSIC算法对于瞬态击穿信号有更好的定位效果。采用8阵元的直线阵列在某高压大厅的GIS模型上代替GIL进行耐压击穿定位试验研究,基于连续小波变换的MUSIC算法结合双阵列平台交叉定位对GIL击穿信号源的定位误差小于10 cm,试验结果表明该方法可应用于GIL的击穿定位。

In view of such issue as complex testing process and weak location accuracy of the breakdown and loca-tion mode of traditional GIL,the location of GIL breakdown signal source is identified bu using spatial spectrum esti-mation technology based on microphone array.By the joint analysis of the time-frequency domain of breakdown sig-nal through the transform of continuous wavelet,the time-frequency array signal model with multi-resolution is con-structed and introduced into the traditional MUSIC algorithm in order to improve DOA estimation accuracy of the GIL breakdown signal.The location effect of the algorithm is analyzed by numerical simulation.The simulation result shows that the MUSIC algorithm in combination with the transform of continuous wavelet has better location effect for the transient breakdown signal.The linear array of 8 elements is adopted to replace GIL in the GIS model at certain HV hall to perform the research of withstanding voltage breakdown location test.The location error of GIL breakdown signal source of continuous wavelet transform-based MUSIC algorithm in combination with double array platform cross location is less than 10 cm.The test result shows that the method can be used for the breakdown location of GIL.