电力系统自动化Issue(3)：69-75,7.DOI:10.7500/AEPS20140119002
IEC 框架下非同步采样时的谐波和间谐波测量方法
Measuring Method of Harmonics and Inter-harmonics with Nonsynchronous Sampling in IEC Framework
王泽 1杨洪耕 1袁晓冬2
作者信息
- 1. 四川大学电气信息学院，四川省成都市 610065
- 2. 国网江苏省电力公司电力科学研究院，江苏省南京市 211103
- 折叠
摘要
Abstract
Discrete Fourier transform/fast Fourier transform (DFT/FFT) spectrum leakage will occur during nonsynchronous sampling in fundamental frequency, with harmonics and inter-harmonics spectrum mutual interference affecting the measurement results,while the traditional interpolating windowed FFT method ignores the influence of long-range leakage from other components on the component of concern.Firstly,the spectrum of Hanning weighted signal in IEC framework is transformed,to change side lobes adjacent spectral phase difference to 180 degrees in other components.The vector sum of adjacent lines is used to eliminate the influence of long-range leakage on the component of concern,thereby proposing the group measurement method and accurate measurement method of harmonics and inter-harmonics.The measurement of harmonics and inter-harmonics specific parameters is realized.Based on this, the harmonics and inter-harmonics separating method is presented,and furthermore,by successive removal of the leakage value of known components on the spectral lines of the component of concern,the measuring accuracy is improved.During nonsynchronous sampling without increasing the length of the sampling data,an effective solution to the harmonics and inter-harmonics inability to be accurately measured when closely spaced is found.Simulation and engineering data have validated real-time and effective characteristics of the proposed methods in the IEC framework.关键词
非同步采样/IEC 框架/间谐波测量/谐波/间谐波分离/快速傅里叶变换Key words
nonsynchronous sampling/IEC framework/inter-harmonics measurement/harmonics and inter-harmonics separation/fast Fourier transform (FFT)引用本文复制引用
王泽,杨洪耕,袁晓冬..IEC 框架下非同步采样时的谐波和间谐波测量方法[J].电力系统自动化,2015,(3):69-75,7.
