NDLI: Hybrid approach for immunisation of DFT-based phasor estimation method against decaying DC components

Content Provider	IET Digital Library
Author	Allahbakhshi, Mehdi Tajdinian, Mohsen Seifi, Ali Reza Jahromi, Mehdi Zareian Bagheri, Alireza
Abstract	In addition to high-order harmonic and noise components, the fault current may contain decaying DC components which highly affect the estimated fundamental frequency phasor. This study presents a new hybrid method which aims to calculate and remove the unwanted effect of decaying DC components on fundamental phasor estimation. The main novelty of the proposed method is that the proposed method is independent of the dynamic behaviour of the current transformer (CT). In other words, unlike previously published papers, this method analytically calculates the CT time constant. To such aim, utilising frequency modulation, fault current signal is shifted. Utilising simple but comprehensive formulations based on integration and Prony-complex theory, the magnitude and time constant of decaying DC components are calculated in one cycle. After that, utilising a modified discrete Fourier transform the fundamental phasor component is calculated. Several test signals and also practical fault signals are applied to the proposed method. The simulation results illustrate the proposed method simply but comprehensively remove the unwanted effects of the decaying DC components. Also, it has quick speed as well as a high-precision response in the estimation of fundamental phasor under different simulation scenarios.
Starting Page	238
Ending Page	246
Page Count	9
ISSN	17518822
Volume Number	13
e-ISSN	17518830
Issue Number	Issue 2, Mar (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/13/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2018.5149
Journal	IET Science, Measurement & Technology
Publisher Date	2018-10-22
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Current Transformers Decaying DC Component DFT-based Phasor Estimation Method Discrete Fourier Transform Estimated Fundamental Frequency Phasor Fault Current Fundamental Phasor Component Fundamental Phasor Estimation High-order Harmonic Integral Transforms Noise Component Power System Protection Power Transmission Fault Statistics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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