摘要
局部放电(partial discharge,PD)检测是绝缘检测与诊断最有效的方法之一。基于L型天线阵列信号处理,及旋转不变技术(estimating signal parameter via rotational invariance techniques,ESPRIT)求取信号波达方向(direction of arrival,DOA)的思想,提出了一种变电站局部放电定位方法,可以实现局部放电源的平面定位。该算法不需要计算信号的时延序列,故可以降低对采集系统采样率的要求,且其通过求解2个波达方向上的直线交点,即求解二元一次方程组,得到局部放电源的平面坐标,避免了求解非线性方程组。给出了算法的理论基础和实现步骤,并分别对电磁波仿真软件得到局部放电信号,及变电站现场实测的局部放电辐射电磁波信号进行分析处理。结果表明,利用该算法得到局部放电源位置的平面定位误差<30cm,满足变电站全站局部放电源的定位精度要求,验证了算法的准确性和可行性。
Abstract： Partial discharging （PD） test is one of the most effective methods for insulation detection and diagnosis. We propose a novel localization algorithm For partial discharge in substation, based on the L-shaped antenna array signal processing and the idea of estimating signal parameter via rotational invariance techniques（ESPRIT） for the signals＇ direction of arrival（DOA）. By using this localization algorithm, the planar location of partial discharge can be achieved. Since the algorithm does not calculate the time delay sequence of the signals received, it reduces the sampling rate requirements for the acquisition system. Moreover, the method solves the intersection of two straight lines in the direction of arrival, i.e. solves linear equations of two unknowns, to get the 2-D location of a partial discharge, so it avoids solving nonlinear equations. Moreover, the theoretical foundation and the implementation steps of the algorithm are presented, and the algorithm is applied for analyzing the software-simulated electromagnetic wave signals and the field signals from partial discharges in substation. The results show that the obtained planar locations of PD sources have errors less than 30 cm, which meets the requirements of accuracy for PD localization in substation, and validates the veracity and feasibility of the proposed algorithm.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第11期2692-2698,共7页
High Voltage Engineering
基金
国家高技术研究发展计划(863计划)(SS2012AA050803)~~
关键词
局部放电
阵列信号处理
旋转不变技术
波达方向
电磁波
定位算法
partial discharge
array signal processing
estimation signal parameter via rotational invariance techniques
direction of arrival
electromagnetic wave
localization algorithm
