基于加窗插值谐波分析法的容性设备介损角测量研究  

Measurement of Dielectric Loss Angle of Capacitive Equipment Based on windowed Interpolation Harmonic Analysis Method

作　　者：李杰 杨志华 王应芬 朱胤宇 李家保 隋永浩 马学林 Li Jie;Yang Zhihua;Wang Yingfen;Zhu Yinyu;Li Jiabao;Sui Yonghao;Ma Xuelin(Yunnan power grid lability co.LTD.Honghe power supply bureau,Honghe,Yunnan 654400,China)

机构地区：[1]云南电网责任有限公司红河供电局,云南红河654400

出　　处：《云南电力技术》2020年第2期44-49,共6页Yunnan Electric Power

摘　　要：谐波分析法是容性设备介损角在线提取的常用方法,而谐波分析法的基础——离散傅里叶变换(DFT)存在的频谱泄露和栅栏效应会影响介损角测量的效果。本文通过对不同窗函数数谱分析及比选的基础上,提出了基于汉宁窗插值算法的容性设备介损角提取方法。首先获取电压、电流信号离散序列,求取汉宁窗修正式,并修正基波频率,然后求取修正后的电压电流相角,最后公式计算求出介质损耗角。通过仿真验证,表明了该算法具有较高精度且稳定性较好,对于基波频率波动、采样频率变化及白噪声均有较好的测量效果。Harmonic analysis is a common method for online extraction of dielectric loss angles of capacitive devices.The basis of harmonic analysis method,the spectral leakage and fence effect of discrete Fourier transform(DFT),will affect the effect of dielectric loss angle measurement.Based on the analysis and comparison of different window functions,this paper proposes a method based on Hanning window interpolation algorithm to extract the dielectric loss angle of capacitive devices.Firstly,obtain the discrete sequence of voltage and current signals.After that,we obtain the Hanning window repair and modify the fundamental frequency.Then calculate the voltage and current phase angle.At last,the loss angle of medium is obtained by using the formula.The simulation results show that the algorithm has higher accuracy and stability.Good,for the fundamental frequency fluctuations,sampling frequency changes and white noise have a good measurement effect.

关 键 词：容性设备 介质损耗角 汉宁窗 谐波分析法 

分 类 号：TM74[电气工程—电力系统及自动化]