基于全相位谱细化与校正的谐波和间谐波测量方法  

Method of Harmonics and Interharmonics Measurement Based on All-Phase Spectrum Zoom and Correction

作　　者：邹培源 黄纯[1] 江辉[2] 周迭辉 

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082 [2]深圳大学光电工程学院,广东省深圳市518061 [3]珠海博威电气股份有限公司,广东省珠海市519000

出　　处：《电网技术》2016年第8期2496-2502,共7页Power System Technology

基　　金：国家863高技术基金项目(2011AA05A114);深圳市基础研究计划(JCYJ20140418193546100)~~

摘　　要：当谐波附近含有密集频谱的间谐波时,严重的主瓣干涉影响谐波、间谐波参数的精确估计。提出一种综合利用全相位快速傅里叶变换(fast Fourier transform,FFT)分析及频谱校正、频谱细化技术的含密集频谱的谐波、间谐波测量方法。首先,利用全相位FFT相位差校正法对其电力信号进行谐波分析,得到各频率谐波、间谐波成分;然后,由相位谱平坦特性判别电力信号是否含密集频谱成分,并获得密集频谱谐波、间谐波的频率位置;对信号的密集频谱段进行细化分析,得到频率间隔相近的谐波、间谐波参数。该方法可精确获取信号各频率成分的频率、幅值和相位,保证密集频谱段谐波和间谐波的测量精度,且计算量较小。仿真结果验证了所提方法的有效性。When frequency of harmonics is near to that of interharmonics, serious interference from main lobe will affect precise parameter estimation of harmonics and interharmonics. By comprehensive utilization of all-phase FFT, spectrum correction and spectrum zoom technology, a new method was proposed in this paper to analyze harmonics and interharmonics even in dense frequency bands. First, electric signals were analyzed with all-phase FFT phase difference correction algorithm to get parameters of harmonic and interharmonic components. Then flatness characteristics of all-phase FFT phase spectrum were used to distinguish whether electric signals contained dense spectrum components, and determine frequency range of dense spectrum. At last, spectrum zoom analysis was carried out and harmonic and interharmonic parameters in dense spectrum range were obtained. With moderate calculation burden, the proposed method could precisely estimate frequencies, amplitudes and phases of all frequency components, including harmonics and interharmonics in dense frequency bands. Simulation results verified effectiveness of the proposed method.

关 键 词：谐波 间谐波 全相位FFT 频谱校正 频谱细化 

分 类 号：TM76[电气工程—电力系统及自动化]