在线检测介质损耗角的矩阵束方法  

An On-Line Detection Method of Dielectric Loss Angle Based on Matrix Pencil Algorithm

作　　者：董爽[1] 李天云[1] 王永[2] 彭茂君[2] 

机构地区：[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

出　　处：《电工技术学报》2015年第18期229-236,共8页Transactions of China Electrotechnical Society

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25d B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。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 25 d B, 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.

关 键 词：介损角 矩阵束算法 参数提取 绝缘 在线检测 

分 类 号：TM835[电气工程—高电压与绝缘技术]