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Estimation of non-stationary frequency and fundamental components for power electronics-dominated energy systems
File(s)
Author(s)
Li, Peng
Lam, Hin Sang
Chen, Boli
Ng, Raymond Wai M
Parisini, Thomas
Type
Journal Article
Abstract
Estimation of fundamental frequency and sinusoidal components is required for the regulation of modern power electronics-dominated power systems. Most of the existing estimation methods are designed for signals with stationary frequency. Hence, their accuracy could significantly degrade in the face of non-stationary frequencies, which is common in low-inertia power systems. In this paper, we propose a novel scheme for real-time estimation of a time-varying power frequency and the resulting fundamental signal. This is a time-domain method for (1) estimating non-stationary frequency and (2) fundamental signal reconstruction. It has the advantage of tracking the fundamental frequency component and treating all harmonics and subharmonics as noise. The method is based on a kernel-based estimation scheme and characterized by high accuracy, fast response, and noise immunity because of the inclusion of non-asymptotic kernel functions. The effectiveness of the proposed estimation scheme for non-stationary frequency tracking and fundamental signal reconstruction is verified by simulation and experimental results, which explore the use of the proposed scheme for frequency extraction of power signals appear in real world low-inertia systems.
Date Issued
2025-06-26
Date Acceptance
2025-06-16
Citation
IEEE Open Journal of Power Electronics, 2025, 6, pp.1202-1214
URI
URL
DOI
ISSN
2644-1314
Publisher
IEEE
Start Page
1202
End Page
1214
Journal / Book Title
IEEE Open Journal of Power Electronics
Volume
6
Copyright Statement
© 2025 The Authors. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
License URL
Subjects
Accuracy
Adaptive and nonlinear estimation
DFT
DISCRETE FOURIER-TRANSFORM
Engineering
Engineering, Electrical & Electronic
Estimation
FILTER
frequency detection
Frequency estimation
Harmonic analysis
HARMONIC DETECTION METHODS
Kernel
Noise
Phase locked loops
phase-locked loop
power component extraction
Power harmonic filters
Power system dynamics
Science & Technology
Technology
TIME ESTIMATION
Time-frequency analysis
Publication Status
Published
Date Publish Online
2025-06-26