Open AccessMinimizing the undesirable effect of coupling capacitor voltage transformer on DFT‐based phasor estimation method
Author(s) -
Tajdinian Mohsen,
Allahbakhshi Mehdi,
Seifi Ali Reza,
Bagheri Alireza
Publication year - 2019
Publication title -
international transactions on electrical energy systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 42
ISSN - 2050-7038
DOI - 10.1002/etep.2672
Subject(s) - phasor , control theory (sociology) , transient (computer programming) , matlab , transformer , capacitor , estimator , fault (geology) , voltage , engineering , computer science , electronic engineering , electric power system , mathematics , physics , electrical engineering , power (physics) , control (management) , quantum mechanics , artificial intelligence , statistics , seismology , geology , operating system
Summary This paper presents an innovative half‐cycle method to minimize the undesirable effects of coupling capacitor voltage transformer (CCVT) on the discrete Fourier transform (DFT)‐based phasor estimation methods during fault condition. The proposed method analytically calculates transient components of the CCVT by using a combination of half‐cycle phase shifting along with the modified least squares technique. The latter combination is used to obtain the transient characteristics of CCVT. Afterward, subtracting estimated transient behavior from original voltage fault signal, modified half‐cycle DFT is utilized to estimate fundamental phasor component. Half‐cycle DFT formulation is modified to cope with the instability caused by off‐nominal frequency condition. Based on some case studies conducted on MATLAB software environment, the performance of the proposed phasor estimator is investigated. The results illustrate that the proposed method estimates fundamental phasor component with an ignorable effect of CCVT transient in almost half cycle after disturbance happening under different fault conditions.