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This paper presents a novel phasor estimation algorithm, which combines the filtering characteristics of the maximal overlap discrete wavelet transform (MODWT) and the least error square (LES) algorithm. Time and frequency response of the designed filters are compared to the ones of traditional discrete Fourier transform (DFT) filters. The obtained results indicate that the designed filters have time...
In this work, an accurate coupling capacitor voltage transformer (CCVT) model for electromagnetic transient studies is presented. The model takes into account linear and nonlinear elements. A support routine was developed to compute the linear 230kV CCVT parameters (resistances, inductances and capacitances) from frequency response data. The magnetic core and surge arrester nonlinear characteristics...
An algorithm for finding the steady state solution of systems containing linear, nonlinear elements and/or periodic switching power electronic devices is presented. The method is suitable to be used in connection with programs like the EMTP to determine the network initial conditions. Linear elements are represented as pure conductance matrices: for linear resistances, their corresponding conductance...
In this work, measurements were carried out for a 230 kV coupling capacitor voltage transformer (CCVT) in a high voltage laboratory. In order to obtain the frequency response data to be used as input data to a routine developed to compute the CCVT parameters, frequency response measurements, for magnitude and phase, were carried out for the CCVT. These measurements were made directly, without the...
Summary form only given. This paper presents a novel method to estimate transformer saturation characteristics that extend to the 'deep' saturation region. The basic idea of the method is to use recorded inrush voltage and current waveforms to estimate the saturation characteristics. Accurate representation of a transformer's 'deep' saturation region is important for studying the impact of transformer...
This work presents a general and simple method to obtain a single multiphase equivalent pi-circuit, suitable for power flow studies that takes the coupling effects into account for any line transposition scheme. The resulting circuit, suitable for use in connection with multiphase power flow programs is obtained from node reduction of all cascaded multiphase pi-circuits, each one representing the...
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