基于改进全相位算法的高精度介质损耗角的测量

doi:10.19595/j.cnki.1000-6753.tces.190673

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摘要由于快速傅里叶算法在实际应用中存在栅栏效应和频谱泄漏的问题,且用于测量介质损耗角的精度不高,该文提出一种基于混合卷积窗和改进全相位的高精度介质损耗角测量方法。用主、旁瓣性能更好的混合卷积窗对信号截断以减小频谱泄露,用全相位傅里叶变换具有的“相位不变性”以消除栅栏效应,并针对全相位傅里叶提出差分式相位校正方法。分别在基波频率变动、信噪比变化、谐波含量变化及采样点数的影响下对比验证,结果表明所提方法的检测精度高于加窗插值的傅里叶变换算法,尤其在非同步采样时,其优势更加显著。

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	张家军
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关键词 ：全相位, 傅里叶变换, 混合卷积窗, 介损角

Abstract：The fast Fourier algorithm has the problems of fence effect and spectrum leakage in practical application. The accuracy of dielectric loss angle measurement by fast Fourier algorithm is not high. A high precision dielectric loss angle measurement method based on hybrid convolution window and improved all-phase was proposed. The mixed convolution window with better main and side lobes was used to truncate the signal to reduce the spectrum leakage. The "phase invariance" of all-phase Fourier transform was used to eliminate the fence effect. A differential phase correction method was proposed for all-phase Fourier transform. It is compared under the influence of fundamental frequency variation, signal-to-noise ratio change, harmonic content change and sampling points and the results show that the detection accuracy of the proposed method is higher than that of the windowed interpolation Fourier transform algorithm, especially in asynchronous sampling.

Key words： All-phase Fourier transform mixed convolution window dielectric loss angle

收稿日期: 2019-06-03

PACS:

TM835

基金资助:国家自然科学基金资助项目（51667018）

通讯作者: 张新燕女,1964年生,教授,博士生导师,研究方向为新能源发电控制与并网技术。E-mail: xjcxzxy@126.com

作者简介: 张家军男,1993年生,硕士研究生,研究方向为电力谐波分析。E-mail: 1624236670@qq.com

引用本文:

张家军, 张新燕, 陈倩, 邸强, 杨璐璐. 基于改进全相位算法的高精度介质损耗角的测量[J]. 电工技术学报, 2020, 35(14): 3097-3104. Zhang Jiajun, Zhang Xinyan, Chen Qian, Di Qiang, Yang Lulu. High Precision Dielectric Loss Angle Measurement Based on Improved All-Phase Algorithm. Transactions of China Electrotechnical Society, 2020, 35(14): 3097-3104.

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