On the Use of Multi-Harmonic Least-Squares Fitting for THD Estimation in Power Quality Analysis

Metrology and Measurement Systems

Fernando Janeiro¹  Tomáš Radil¹  Pedro Ramos¹ 

关键词: Harmonic analysis;    Power quality;    Signal reconstruction;    Spectral analysis;    Harmonic distortion;   

DOI  :  10.2478/v10178-012-0025-8

来源: Versita

【 摘 要 】

The quality of the supplied power by electricity utilities is regulated and of concern to the end user. Power quality disturbances include interruptions, sags, swells, transients and harmonic distortion. The instruments used to measure these disturbances have to satisfy minimum requirements set by international standards. In this paper, an analysis of multi-harmonic least-squares fitting algorithms applied to total harmonic distortion (THD) estimation is presented. The results from the different least-squares algorithms are compared with the results from the discrete Fourier transform (DFT) algorithm. The algorithms are assessed in the different testing states required by the standards.

【 授权许可】

Unknown