Open AccessApplication of least squares fitting algorithm in transformer terminal unit electrical quantities acquisition
Author(s) -
Chao Jiang,
Wang Fu-liang,
Ning Yan
Publication year - 2022
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/983/1/012021
Subject(s) - harmonics , algorithm , window function , transformer , harmonic , fundamental frequency , harmonic analysis , amplitude , interpolation (computer graphics) , dc bias , voltage , mathematics , computer science , acoustics , engineering , mathematical analysis , electrical engineering , physics , optics , telecommunications , spectral density , frame (networking)
In order to accurately estimate the frequency and harmonics of voltage and current signals acquired in transformer terminal unit (TTU), the least squares fitting algorithm is applied to its harmonic analysis. The principle of the algorithm and its flowchart are presented, and the implementation of the algorithm in TTU is primarily discussed. The noisy voltage signals with harmonics and signal frequencies ranging from 49.8 Hz to 50.2 Hz are generated and the real ones are acquired. The harmonic analysis results of the least squares fitting algorithm and the Hanning window and interpolation algorithm reveal that the errors in the signal frequency, direct current (DC) component, amplitude and phase of fundamental and harmonics of the former are only about 1/3 of that of the latter.