局部放电定向超声阵列Dir-MUSIC测向算法仿真  

Simulation of Dir-MUSIC Direction-Finding Algorithm for Partial Discharge Direction-Finding Ultrasonic Array

作　　者：蒋骁 徐文聪 胡岳[3,4] 陈炳树[3,4] 张周胜 JIANG Xiao;XU Wencong;HU Yue;CHEN Bingshu;ZHANG Zhousheng(School of Electrical Engineering,Shanghai University of Electrical Power,Shanghai 200090,China;Zhejiang Testing&Inspection Institute for Mechanical and Electrical Products Quality Co.,Ltd.,Hangzhou 310051,China;Department of Electrical Engineering,School of Electrical Information and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Key Laboratory of Control of Power Transmission and Conversion(SJTU),Ministry of Education,Shanghai 200240,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]浙江省机电产品质量检测所有限公司,杭州310051 [3]上海交通大学电子信息与电气工程学院电气工程系,上海200240 [4]电力传输与功率变换控制教育部重点实验室,上海200240

出　　处：《南方电网技术》2024年第4期71-79,共9页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51777122)。

摘　　要：超声波检测方法在电力设备绝缘状态检测定位中应用广泛。针对局部放电超声测向MUSIC算法存在的采样率要求高、计算复杂度大等不足,提出基于定向超声阵列信号强度信息的定向多重信号分类(directional multiple signal classification,Dir-MUSIC)算法。在阐述该算法理论模型和应用条件基础上,针对均匀圆盘超声阵列,仿真研究了不同增益方向图主瓣宽度、不同信噪比条件下Dir-MUSIC算法的测向精度。仿真结果表明8阵元阵列在-5 dB信噪比、方向图主瓣宽度为90°~120°时测向精度最高,均方根误差小于2°。最后基于研制的微型机电系统麦克风(microelectro-mechanical system,MEMS)定向超声阵列进行了测向试验,结果表明8阵元圆盘超声阵列测向均方根误差最小为2.76°,测向标准差最小为2.72°,验证了Dir-MUSIC算法的有效性与准确性。The ultrasonic testing method is widely used in the detection and positioning of insulation status of power equipment.The directional MUSIC(Dir-MUSIC) direction-finding algorithm based on direction-finding ultrasonic array signal strength information is proposed to overcome the shortcomings of MUSIC algorithm for partial discharge ultrasonic direction-finding,such as high sampling rate requirements and large computational complexity.On the basis of elaborating on the theoretical model and application conditions of the algorithm,the paper simulates and studies the direction-finding accuracy of the Dir-MUSIC algorithm under different gain pattern main lobe width and signal-to-noise ratio conditions for a uniform disc ultrasonic array.The simulation results show that the 8-element array has the highest direction-finding accuracy at a signal-to-noise ratio of-5 dB and a main lobe width of 90 °~120 °,with a root mean square error of less than 2 °.Finally,a direction-finding experiment is conducted based on the developed MEMS direction-finding ultrasound array.The results show that the root mean square error of direction-finding for the 8-element disc ultrasound array is the minimum of 2.76 °,and the standard deviation of direction-finding is the minimum of 2.72 °,which verify the effectiveness and accuracy of the Dir-MUSIC algorithm.

关 键 词：局部放电 超声波检测 定向麦克风阵列 Dir-MUSIC算法 测向 

分 类 号：TM831[电气工程—高电压与绝缘技术]