电工技术学报  2015, Vol. 30 Issue (18): 229-236    DOI:
高电压与绝缘 |
在线检测介质损耗角的矩阵束方法
董爽1, 李天云1, 王永2, 彭茂君2
1. 东北电力大学输变电技术学院 吉林 132012;
2. 国网北京市电力公司 北京 100031
An On-Line Detection Method of Dielectric Loss Angle Based on Matrix Pencil Algorithm
Dong Shuang1, Li Tianyun1, Wang Yong2, Peng Maojun2
1. Northeast Dianli University Jilin 132012 China;
2. State Grid Beijing Electric Power Company Beijing 100031 China
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摘要 介质损耗角是反映电容性电气设备绝缘状况的重要参数之一。为了准确检测介损角,提出了一种基于矩阵束算法的介损角在线检测方法。该方法兼具提取基波信号参数和抑制噪声干扰的功能,可以高精度提取基波电压、电流信号的初始相角,实现介损角的准确检测。大量仿真结果表明:信号频率、3次和5次谐波分量、直流分量、介损角真实值、采样频率及采样点数等扰动对矩阵束检测法基本没有影响;当信号的信噪比不小于25dB时,无需对原始信号进行预处理,就可以获得较高的检测精度,且检测速度较快。仿真分析结果验证了该方法在介损角在线检测中的可行性和有效性。
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关键词 介损角矩阵束算法参数提取绝缘在线检测    
Abstract:Dielectric loss angle is an important index to reflect the insulation condition of capacitive electric equipment. Based on matrix pencil algorithm, a novel method is proposed to detect dielectric loss angle online. The method processes the functions of both fundamental harmonic parameter extraction and noise suppression. It can accurately extract the initial phases of the fundamental voltage and current signal, to realize the accurate detection of dielectric loss angle. Simulation results show that the change of some parameters has little influence on the proposed method, such as signal frequency, 3rd and 5th harmonics, direct current bias, real value of dielectric loss angle, sampling frequency and sampling points, and so on. When the signal-to-noise ratio is not lower than 25dB, no need to preprocess the original data, the proposed method can achieve higher measurement precision with fast detecting speed. Simulation results also show the feasibility and effectiveness of the method.
Key wordsDielectric loss angle    matrix pencil algorithm    parameter extraction    insulation    on-line measurement   
收稿日期: 2013-11-04      出版日期: 2015-10-20
PACS: TM835  
作者简介: 董 爽 女,1978年生,硕士,讲师,研究方向为非线性系统理论在电力系统中的应用。李天云 男,1945年生,教授,从事自动控制理论、信号处理、非线性系统理论的教学及其在电力系统中的应用研究工作。
引用本文:   
董爽, 李天云, 王永, 彭茂君. 在线检测介质损耗角的矩阵束方法[J]. 电工技术学报, 2015, 30(18): 229-236. Dong Shuang, Li Tianyun, Wang Yong, Peng Maojun. An On-Line Detection Method of Dielectric Loss Angle Based on Matrix Pencil Algorithm. Transactions of China Electrotechnical Society, 2015, 30(18): 229-236.
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