摘要
局部放电是衡量电力设备绝缘状态的重要指标,局放检测需要解决局放源定位问题。多重信号分类(multiple signal classification,MUSIC)采用全向天线作为接收阵列,可实现多源信号的超分辨率空间谱估计,但要求高信号采样率,且在低信噪比情况下抗干扰能力不足。为此,提出基于弧形阵列的Dir(directional)-MUSIC算法,采用定向天线接收信号的强度信息,实现低信噪比下的局放源波达方向估计。设计了接收局放信号的Vivaldi天线阵列,并在不同信噪比下对算法的有效性进行仿真验证。结果表明:在低信噪比-10 dB来波方向5°下角度误差为0.14°,优于MUSIC算法;阵列在信噪比10 dB,测向范围[-80°,80°]内定位均方根误差小于1.5°。证明了基于弧形阵列的Dir-MUSIC算法有效提高了局放定位精度,且对噪声具有良好的鲁棒性,具有用于局放检测的潜力。
Partial discharge is an important indicator for measuring the insulation status of power equipment,and the partial discharge detection needs to solve the problem of locating the partial discharge source.Multiple signal classification(MUSIC)uses omnidirectional antennas as the receiving array,which can achieve super-resolution spatial spectrum estimation of multi-source signals.However,it requires high signal sampling rate and insufficient anti-interference ability in low signal-to-noise ratio situations.To this end,a Dir(directional)-MUSIC algorithm based on an arc-shaped array was proposed,which utilized directional antenna to receive signal strength information and achieved direction of arrival(DoA)estimation of local discharge sources under low signal-to-noise ratio.A Vivaldi antenna array was designed to receive partial discharge signals,and the effectiveness of the algorithm was simulated and verified under different signal-to-noise ratios.The results show that the angle error of 0.14°in a low signal-to-noise ratio of-10 dB and a direction-finding direction of 5°,and which is superior to the MUSIC algorithm;the array has a root mean square error of less than 1.5°in positioning within a signal-to-noise ratio of 10 dB and a direction-finding range of[-80°,80°].It proves that the Dir-MUSIC algorithm based on the arc-shaped array effectively improves the accuracy of partial discharge positioning and has good robustness to noise,and has the potential for use in partial discharge detection.
作者
李汉
陈炳树
胡岳
Li Han;Chen Bingshu;Hu Yue(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《电气自动化》
2024年第4期84-86,89,共4页
Electrical Automation
