Auxiliary Prony‐based algorithm for performance improvement of DFT phasor estimator against transient of CCVT. Issue 5 (1st July 2019)

• Record Type: Journal Article
• Authors: Tajdinian, Mohsen; Allahbakhshi, Mehdi; Seifi, Ali Reza; Jahromi, Mehdi Zareian; Behi, Donya
• Is Part Of: IET science, measurement & technology. Volume 13:Issue 5(2019)
• Page Start: 708
• Page End: 714
• Publication Date: 2019-07-01
• Subjects: discrete Fourier transforms -- fault location -- power transmission protection -- transient response -- least squares approximations -- potential transformers; transient response -- frequency modulation -- Prony‐complex theory -- CCVT characteristics -- fault inception -- simulated test signals -- unwanted effect -- auxiliary Prony‐based algorithm -- performance improvement -- DFT phasor estimator -- measured fault voltage signal -- capacitor voltage transformer -- transient components -- estimated fundamental frequency phasor -- undesirable effect -- fundamental phasor component results -- hybrid method -- CCVT transient -- fundamental phasor estimation -- CCVT parameters -- published papers; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2018.5390
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : The measured fault voltage signal through coupling capacitor voltage transformer (CCVT) contains transient components which highly affect the estimated fundamental frequency phasor. This paper presents a new hybrid method which aims to calculate and remove the unwanted effect of CCVT transient on the fundamental phasor estimation. The main novelty of the proposed method is that proposed method is independent from the CCVT parameters involved in the transient response. In other words, unlike previously published papers, this method calculates the CCVT characteristics involved in the transient response. To such aim, by utilizing frequency modulation, fault voltage signal is shifted. Utilizing simple but comprehensive formulations based on integration and Prony‐complex theory, the CCVT characteristics are calculated in the first cycle after fault inception. After that, by utilizing modified discrete Fourier transform (MDFT), the fundamental phasor component is calculated in one cycle. Several simulated test signals are applied to the proposed method. The simulation results illustrate that the proposed method removes the unwanted effects of CCVT. Also, it is fast and has a good precision in estimating the fundamental phasor component of fault voltage signal under different simulation scenarios.