Development of interharmonics identification using enhanced-FFT algorithm

The Journal of Engineering

Hsiung Cheng Lin¹ 

[1] Department of Electronic Engineering, National Chin-Yi University of Technology, Taiwan

关键词: interharmonic analysis;    interharmonic amplitude;    enhanced FFT algorithm;    fast Fourier transform;    International Electrotechnical Commission;    mathematical equation;    power system harmonics;    interharmonic frequency;    dispersed leakage energy;    interharmonics identification;    IEC st;    ard;   

DOI  :  10.1049/joe.2017.0133

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

The fast Fourier transform (FFT) is a mostly used tool to measure power system harmonics. FFT, however, is not applicable to analyse interharmonics due to spectral leakage effect. Although International Electrotechnical Commission (IEC) standard is recommended for interharmonic measurement, the individual interharmonic frequency and respective amplitude cannot be worked out under this framework. For this reason, this paper proposes an enhanced-FFT model to build up the relationship between interharmonic frequency and dispersed leakage energy. The mathematical equation is thus established to find actual value of interharmonic frequency. Moreover, the true interharmonic amplitude can be retrieved from the dispersed energy collection. In other words, the sampling window length is no longer required to match the interharmonic period and the correct measurement results can be achieved. The proposed model is developed using a simple arithmetic equation so that it is feasible for more efficient calculation for interharmonic analysis. Performance results verify that the proposed scheme can achieve accurate, rapid and reliable outcomes.

【 授权许可】

CC BY