Harmonic Measurement Algorithm of Power System Integrating Wavelet Transform and Deep Learning

Hanshu Jiang; Yutian Li; Zhu Liu; Guanghao Wu; Zeyang Liu

doi:10.4108/ew.7536

Authors

Hanshu Jiang State Grid Jilin Electric Power Co.
Yutian Li State Grid Jilin Electric Power Co.
Zhu Liu State Grid Jilin Electric Power Co.
Guanghao Wu State Grid Jilin Electric Power Co.
Zeyang Liu Northeastern University

DOI:

https://doi.org/10.4108/ew.7536

Keywords:

Harmonic measurement, Power systems, Wavelet transform, Deep learning, Adaptive neural network

Abstract

INTRODUCTION: The problem of low accuracy in harmonic measurement is a significant challenge in power systems. Traditional methods often exhibit higher measurement errors, leading to unreliable detection of harmonics. To address this, the author proposes a new approach that integrates wavelet transform and deep learning techniques for enhanced harmonic measurement accuracy.

OBJECTIVES: The primary goal of this study is to develop a more accurate harmonic measurement algorithm by combining full phase fast Fourier transform (FFT) and adaptive neural networks. The research aims to automatically detect power system harmonics with minimal error and improve upon the limitations of traditional methods.

METHODS: The study implemented a harmonic measurement method using full phase FFT integrated with an adaptive neural network. This approach calculates harmonic amplitudes based on the fundamental component and its amplitude, while determining the precise start and end times of harmonics. The system also incorporates mean filtering for automatic detection of harmonics. The effectiveness of the proposed method was evaluated through experiments that compared it to traditional harmonic measurement techniques.

RESULTS: Experimental results demonstrated that the proposed method achieved an average measurement error of 0.02V, with a maximum error of 0.03V, both of which are below the acceptable error limit. In contrast, traditional methods exhibited significantly higher average errors of 3.31V and a maximum error of 5.17V. The new method consistently showed higher accuracy in harmonic detection compared to conventional approaches.

CONCLUSION: The study concludes that the proposed harmonic measurement algorithm significantly improves accuracy compared to traditional methods. With its lower measurement error and effective automatic detection capabilities, the method proves to be highly suitable for harmonic measurement in power systems.

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