Work

Utility harmonic impedance estimation considering unsmooth fluctuation characteristics of background harmonics

Year: 2025

Type: article

Abstract: Accurate estimation of utility harmonic impedance is key to harmonic source determination and harmonic mitigation. Most existing methods depend on the premise that the background harmonics remain constant or fluctuate smoothly, but in practice, the background harmonic voltage and impedance usually exhibit unsmooth variations or even abrupt changes. In light of this issue, this paper proposes a two-stage method for utility harmonic impedance estimation considering unsmooth fluctuation characteristics of background harmonics. In the first stage, multiple abrupt changes of background harmonics are identified through binary sliding T-test to segment the recorded harmonic voltage and current. In the second stage, the utility harmonic impedance is estimated by comprehensive minimum fluctuation and matrix sparsity within each recorded harmonic data interval. Simulation and field case studies are performed to verify the efficacy of the proposed method. The results demonstrate that this method surpasses other previous methods in computational accuracy and efficiency. Moreover, superior robustness against drastic background harmonic fluctuations is also exhibited.

Source: Electric Power Systems Research

DOI: 10.1016/j.epsr.2025.111513

Authors: Tong Ding, Mingxing Zhu, Yi Wen, Min Gao, Yadong Jiao, Qi Wei

Institution: Anhui University

Language: English

Topic: Power Quality and Harmonics

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,810

Funders: National Natural Science Foundation of China, Natural Science Foundation of Anhui Province