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- Title
Hybrid approach for immunisation of DFTbased phasor estimation method against decaying DC components.
- Authors
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 highprecision response in the estimation of fundamental phasor under different simulation scenarios.
- Subjects
PHASOR measurement; DENSITY functional theory; CURRENT transformers (Instrument transformer); FOURIER transform spectroscopy; ESTIMATION theory
- Publication
IET Science, Measurement & Technology (Wiley-Blackwell), 2019, Vol 13, Issue 2, p238
- ISSN
1751-8822
- Publication type
Article
- DOI
10.1049/iet-smt.2018.5149