Analytical discrete Fourier transformer‐based phasor estimation method for reducing transient impact of capacitor voltage transformer. Issue 9 (14th June 2017)

• Record Type: Journal Article
• Authors: Tajdinian, Mohsen; Allahbakhshi, Mehdi; Seifi, Ali Reza; Bagheri, Alireza
• Is Part Of: IET generation, transmission & distribution. Volume 11:Issue 9(2017)
• Page Start: 2324
• Page End: 2332
• Publication Date: 2017-06-14
• Subjects: potential transformers -- discrete Fourier transforms -- least squares approximations -- power system faults -- phasor measurement; analytical discrete Fourier transformer‐based phasor estimation method -- capacitor voltage transformer transient impact reduction -- fundamental component phasor estimation -- CVT transient impact reduction -- hybrid full‐cycle averaging window -- least squares technique -- LS technique -- fault voltage signal -- fundamental phasor component -- DFT -- instability prevention -- off‐nominal frequency sampling rate -- PM -- proposed method -- fundamental phasor voltage fault signal estimation; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2016.1784
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : The output voltage of capacitor voltage transformer (CVT) is highly influential during initiation of contingencies due to its transient behaviour. This study proposes a novel method for fundamental component phasor estimation which reduces the transient impact of CVT. The proposed method (PM) first, based on hybrid full‐cycle averaging window and also least squares (LS) technique, calculates the transient components of the CVT. In the next stage, by subtracting estimated transient behaviour from fault voltage signal, the fundamental phasor component of the obtained signal can be estimated utilising discrete Fourier transformer (DFT). Also, in order to prevent instability due to off‐nominal frequency sampling rate, DFT formulation is improved. Several case studies have been carried out in order to show the robustness of the PM in the realistic simulation scenarios. Results show that the PM given in this study is able to estimate fundamental phasor voltage fault signal quickly and precisely with ignorable effect from transient impacts of CVT in almost always one cycle after fault occurrence.