Novel indices for power quality assessment of non-linear loads

• Published in: Electric power systems research Vol. 236; p. 110952
• Main Authors: de Almeida Coelho, Rodrigo, Araújo, Bruno Vinícius Silveira, Xavier, George Victor Rocha, Rodrigues, Gustavo Aragão, Ferreira, Tarso Vilela, Brito, Núbia Silva Dantas
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-11-2024
• Subjects: Non-sinusoidal systems; Power measurement; Power quality; Power quality measurements; Power system harmonics; Power theory; Power system harmonics; Power theory; Power measurement; Power quality; Non-sinusoidal systems; Power quality measurements
• ISSN: 0378-7796
• DOI: 10.1016/j.epsr.2024.110952

The dissemination of non-linear loads on power systems increases the distortion of power system signals, which diverge from a pure sinusoidal waveform. The power quality (PQ) analysis of this type of load is usually performed based on the power factor, displacement factor, and total harmonic distortion index, however, in certain comparative scenarios of loads with similar characteristics, these quantities may indicate disagreeing performances, hindering an assertive PQ evaluation. This paper proposes two new indices for a PQ assessment based on a power decomposition for non-sinusoidal conditions. The proposed indexes present a comprehensive PQ assessment because they are defined based on power consumption associated with harmonics. The effectiveness of the proposed methodology is demonstrated using actual waveforms from LED lamps. The results attest to the efficacy of the proposed indexes in evaluating PQ. Moreover, since the proposed indices are related solely to the powers associated with the voltage signal and frequency components of the current signal, they constitute reliable indicators of power losses associated with harmonics.
•Two new power quality assessment indices based on a power decomposition.•The proposed indices are based on power consumption associated with harmonics.•Tested with actual waveforms from several LED lamps.•The proposed indices serve as indicators of harmonic-related power losses.