NDLI: Robust estimation of voltage harmonics in a single-phase system

Content Provider	IET Digital Library
Author	Reza, Md. Shamim Ciobotaru, Mihai Hossain, Md. Maruf Agelidis, Vassilios Georgios
Abstract	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.
Starting Page	662
Ending Page	670
Page Count	9
ISSN	17518822
Volume Number	13
e-ISSN	17518830
Issue Number	Issue 5, Jul (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/13/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2018.5323
Journal	IET Science, Measurement & Technology
Publisher Date	2019-02-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Estimation Theory Frequency Adaptive Ability Frequency Adaptive Technique Frequency Locked Loops Frequency Variations Frequency-locked Loop Harmonics Linear Kalman Filter Linear KF LKF-FLL Technique Nonlinear KF Off-nominal Frequency Condition Power Harmonic Filter Power Supply Quality Robust Estimation Single-phase System Statistics Voltage Harmonics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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