火力发电机励磁干扰局部放电超声波传感器检测方法  

Ultrasonic Sensor Detection Method of Partial Discharge for Excitation Interference of Thermal Power Generator

作　　者：汤洪高 曹炜 TANG Honggao;CAO Wei(School of Electric Power Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学电气工程学院,上海200090

出　　处：《传感技术学报》2024年第11期2017-2022,共6页Chinese Journal of Sensors and Actuators

基　　金：国网上海市电力公司科技项目(SGSHDK00DYJS2100463)。

摘　　要：在火力发电机中,发电机励磁系统干扰可能会导致局部放电信号变得非常弱,对传感器检测造成困难。针对火力发电机运行过程中,受励磁干扰影响造成局部放电检测性能降低的问题,设计了火力发电机励磁干扰下的局部放电超声波传感器检测方法。在超声波传感器上,使用单位限幅数字方法采集火力发电机运行信号;通过自适应滤波方法,获取无干扰的火力发电机运行信号;采用最优奇异值阈值方法,判断是否存在局部放电,并通过LM算法定位局部放电位置坐标,实现火力发电机励磁干扰局部放电的检测。实验结果表明:所提方法下局部放电定位偏差在0.5~0.1之间,局部放电检测错误率最高为7%,检测时间在89.6 ms~103.4 ms之间。证明所提方法具有较好的火力发电机励磁局部放电检测效果。In the thermal generator,the generator excitation system interference may cause the partial discharge signal to become very weak,which makes it difficult to be detected by the sensor.In view of the problem that the detection performance of partial discharge is reduced due to the excitation interference during the operation of the thermal generator,the ultrasonic sensor detection method of partial discharge under the excitation interference of the thermal generator is designed.On the ultrasonic sensor,the unit limited amplitude digital method is used to collect the operating signal of the thermal generator.The non-interference operational signals of thermal power generators is obtained through adaptive filtering methods.The optimal singular value threshold method is used to judge whether there is partial discharge,and the LM algorithm is used to locate the coordinates of partial discharge,so as to realize the detection of partial discharge caused by excitation interference of thermal generator.The experimental results show that the location deviation of partial discharge is between 0.5-0.1,the maximum error rate of partial discharge detection is 7%,and the detection time is between 89.6 ms and 103.4 ms.It is proved that the proposed method has better detection effect of partial discharge in thermal generator excitation.

关 键 词：火力发电机励磁 超声波传感器 自适应滤波 局部放电 最大奇异值阈值 

分 类 号：TN98[电子电信—信息与通信工程]