基于Blackman自卷积窗及三谱线插值修正的介质损失角计算方法  

Dielectric loss angle calculation based on Blackman self-convolution window and triple-spectrum-line interpolation

作　　者：王永强[1] 谢军[1] 律方成[1] 

机构地区：[1]华北电力大学输变电设备安全防御河北省重点实验室,河北保定071003

出　　处：《电力自动化设备》2015年第6期143-148,共6页Electric Power Automation Equipment

基　　金：国家高技术研究发展计划(863计划)资助项目(2012-AA050802);中央高校基本科研业务费专项资金资助项目(13MS73);国家电网公司资助项目(GY17201200047)~~

摘　　要：非同步采样时,基于谐波分析理论的介质损失角计算结果会有较大误差。为减小该误差,提出一种基于Blackman自卷积窗及三谱线插值修正的介质损失角计算方法。利用旁瓣性能优越的Blackman自卷积窗抑制信号频谱泄漏效应,同时提出利用幅值最大的谱线及其相邻的2根谱线进行三谱线插值以进行频谱校正,进一步提高介质损失角计算精度。在基波频率波动、介质损失角真值变化、谐波比例变化、白噪声影响、采样频率变化的情况下,将所提介质损失角计算方法和基于双谱线插值修正的介质损失角计算方法的计算结果进行对比,结果验证了所提方法的准确性与有效性。搭建了介质损失角模拟测量实验平台,在平台上运用所提方法计算介质损失角,结果表明所提方法的精度较高。As the DLA（Dielectric Loss Angle） calculated by the harmonic analysis has larger error due to the asynchronous sampling,a method of DLA calculation based on BSCW（Blaekman Self-Convolution Window） and triple-spectrum-line interpolation is proposed,which applies the superior side-lobe performance of BSCW to inhibit the spectrum leakage effect and takes the spectrum line with the highest amplitude and two adjacent spectrum lines to correct the spectrum for improving the DLA calculation accuracy. In different conditions,such as fundamental frequency fluctuation,DLA true value variation,harmonic ratio variation, sampling frequency variation and white noise,the DLA calculated by the proposed method is compared with that by the method based on dual-spectrum-line interpolation ,which verifies the correctness and effectiveness of the proposed method. An analogue experiment platform for DLA measuring is built and the proposed method is adopted,verifying its higher calculation accuracy.

关 键 词：介质损失角 Blackman自卷积窗 卷积 三谱线插值 插值 频谱分析 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]