Journal article ยท Ahead of Print article
Robust estimation of voltage harmonics in a single-phase system
Bangladesh University of Engineering and Technology1
Macquarie University2
University of Wisconsin-Green Bay3
Department of Electrical Engineering, Technical University of Denmark4
Smart Electric Components, Center for Electric Power and Energy, Centers, Technical University of Denmark5
Center for Electric Power and Energy, Centers, Technical University of Denmark6
A frequency adaptive technique relying on a linear Kalman filter (KF) is presented here for robust estimation of voltage harmonics under variable frequency conditions in a single-phase system. A relatively simple frequency-locked loop (FLL) is combined with the linear KF (LKF-FLL) to achieve frequency adaptive ability and avoid the use of a non-linear KF.
In contrast to the non-linear extended KF (EKF), the LKF-FLL technique has several advantages such as robustness, linearity, simple tuning, having fewer states, requiring no derivative actions, while offering low complexity, excellent convergence, and computational efficiency. When compared to the non-linear extended real KF, it can generate a faster dynamic response and more accurate steady-state estimation of the harmonics under frequency variations.
It can also provide an improved estimation for off-nominal frequency conditions when compared to the discrete Fourier transform (DFT) method. The effectiveness of the technique is verified by various simulated and real-time experimental case studies.
Language: | English |
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Publisher: | IET |
Year: | 2019 |
Pages: | 662-670 |
ISSN: | 17518830 and 17518822 |
Types: | Journal article and Ahead of Print article |
DOI: | 10.1049/iet-smt.2018.5323 |
ORCIDs: | Agelidis, Vassilios G. , 0000-0002-1560-3846 and 0000-0001-8340-1130 |
LKF-FLL technique estimation theory frequency adaptive ability frequency adaptive technique frequency locked loops frequency variations frequency-locked loop linear KF linear Kalman filter nonlinear KF off-nominal frequency conditions power harmonic filters robust estimation single-phase system voltage harmonics