基于特高频相控阵原理的变电站站域局部放电测向方法

发布时间：2018-10-20 15:38

【摘要】：目前基于特高频(ultra-high frequency,UHF)传感器阵列的敞开式变电站站域局部放电检测与定位方法获得应用,但相关系统存在传感器阵列体积大、不便于现场应用的缺点。鉴于电子对抗领域中相控阵雷达在测向方面的突出优势,该文尝试研究了相控阵原理应用于站域局部放电测向的可行性与测向精度。变电站内设备可近似看成二维分布,采用均匀线阵即可实现方位角估计。阐述了均匀线阵的数学模型及采用多重信号分类算法(multiple signal classification,MUSIC)进行窄带信号测向的原理;因局部放电信号为宽带信号,MUSIC算法测向精度降低,因此首先使用数字带通滤波器将阵列接收数据分散到不同频率点上,再用双边相关变换(two-sided correlation transformation,TCT)算法对UHF信号进行聚焦,使局部放电的宽带信号变换到某个较窄的频带内,从而提高MUSIC算法的测向精度。在理论基础之上,先在不同信噪比下仿真该方法的测向精度,测向误差约为0.8°,进而通过多次实验,表明该方法的实际测向误差约为2°,验证了该方法的准确性及应用于敞开式变电站站域局部放电测向的有效性。
[Abstract]:At present, the partial discharge detection and location method in open substation based on ultra-high frequency,UHF sensor array has been applied, but the related system has the disadvantage of large sensor array size, which is not convenient for field application. In view of the outstanding advantages of phased array radar in the field of electronic countermeasures, this paper attempts to study the feasibility and accuracy of the phased array principle applied to the partial discharge direction finding in the station domain. The equipment in the substation can be regarded as a two-dimensional distribution approximately, and the azimuth estimation can be realized by using a uniform linear array. The mathematical model of uniform linear array and the principle of direction finding for narrowband signals using multi-signal classification algorithm (multiple signal classification,MUSIC) are described. Because partial discharge signals are wideband signals, the precision of MUSIC algorithm is reduced. Therefore, the digital bandpass filter is first used to disperse the array received data to different frequency points, and then the bilateral correlation transform (two-sided correlation transformation,TCT) algorithm is used to focus the UHF signal, so that the partial discharge wideband signal can be converted to a narrower frequency band. In order to improve the direction finding accuracy of MUSIC algorithm. Based on the theory, the direction finding accuracy of the method is first simulated under different SNR, and the direction finding error is about 0.8 掳, and then through many experiments, It is shown that the actual direction finding error of this method is about 2 掳, which verifies the accuracy of the method and the validity of its application in open substation station domain partial discharge direction finding.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);
【基金】：国家电网公司科技项目(5226SX15001R) 国家自然科学基金创新研究群体(51521065);国家自然科学基金项目(51577150)~~
【分类号】：TM63

【相似文献】