TY - JOUR N2 - 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. L1 - http://www.czasopisma.pan.pl/Content/89913/PDF/Journal10178-VolumeXIX%20Issue2_10paper.pdf L2 - http://www.czasopisma.pan.pl/Content/89913 PY - 2012 IS - No 2 EP - 306 DO - 10.2478/v10178-012-0025-8 KW - power quality KW - Harmonic analysis KW - Signal reconstruction KW - Spectral analysis KW - Harmonic distortion A1 - Ramos, Pedro A1 - Janeiro, Fernando A1 - Radil, Tomáš PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2012 T1 - On the Use of Multi-Harmonic Least-Squares Fitting for THD Estimation in Power Quality Analysis SP - 295 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/89913 T2 - Metrology and Measurement Systems ER -