Open AccessAuxiliary Prony‐based algorithm for performance improvement of DFT phasor estimator against transient of CCVT
Author(s) -
Tajdinian Mohsen,
Allahbakhshi Mehdi,
Seifi Ali Reza,
Jahromi Mehdi Zareian,
Behi Donya
Publication year - 2019
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2018.5390
Subject(s) - phasor , control theory (sociology) , transient (computer programming) , fault (geology) , estimator , algorithm , voltage , electronic engineering , transient response , computer science , engineering , mathematics , electric power system , artificial intelligence , power (physics) , physics , electrical engineering , statistics , control (management) , quantum mechanics , operating system , seismology , geology
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.