A Comparative Study on Frequency Estimation Methods

Abstract

-In this paper, a comparative study on the frequency estimation methods using IRDWT (Improved Recursive Discrete Wavelet Transform), FRDWT(Fast Recursive Discrete Wavelet Transform), and GCDFT(Gain Compensator Discrete Fourier Transform) is presented. The 345 [kV] power system modeling data of the Republic of Korea by EMTP-RV is used to evaluate the performance of the proposed two kinds of RDWT(IRDWT and FRDWT) and GCDFT. The simulation results show that the frequency estimation technique based on FRDWT could be the optimal frequency measurement method, and thus can be applied to FDR(Fault Disturbance Recorder) for wide-area blackout protection or frequency measurement apparatus.

Fault area estimation using traveling wave for wide area protection

“…In this section, the modeling of Korean nationwide power transmission system in using EMTP-RV and the various simulations are discussed. The system parameters used in modeling are based on the real system data in PSS/ E files provided by KEPCO and KPX [23][24][25].…”

“…Also, the bus Q, S, T, and V indicate observed bus, and bus Y and Z are unobserved bus. This system is called the DOU 2 system because the number of successive unobserved buses is two [24,25].…”

“…According to the KEPCO's data, Korean power transmission system has 119 buses with 345 kV and 5 buses with 765 kV [23][24][25]. However, not all of them are taken into consideration in modeling.…”

Algorithm for Fault Detection and Classification Using Wavelet Singular Value Decomposition for Wide-Area Protection

“…The value of d1 is calculated by a decomposition and reconstruction process of the level 1 DWT of the signal s[n] using Daubechies 4 (db4) as the mother wavelet based on a moving window with a size of 24 (a half cycle). In this process, assuming that the size of the filter is 8 and the high-pass filters are HD1, HD2, ···· and HD8, then d1 [1]-d1 [6] and d1 [19]d1 [24] do not have a pattern in d1 because of the influence of duplicated signals for convolution multiplication.…”

“…The target network is all the transmission lines of 345 kV and 765kV in 2008 [19][20][21][22]. The transmission lines of 154 kV are treated as a load.…”