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http://dx.doi.org/10.5370/KIEE.2017.66.6.898

High Frequency Noise Reduction Method Using a Newly Designed Low-pass Filter in DFT-Based Phasor Estimation  

Baek, Min-Woo (Dept. of Electrical Engineering, Myongji Univ.)
Kang, Sang-Hee (Dept. of Electrical Engineering, Myongji Univ.)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.66, no.6, 2017 , pp. 898-904 More about this Journal
Abstract
DFT(Discrete Fourier Transform) is one of the most widely used method to estimate the phasor of a relaying signal. The harmonics are eliminated by the DFT. However, high frequency components, except for harmonics, are not removed and cause an error in DFT-based phasor estimation process. This paper suggests high frequency noise reduction method by using a newly designed low-pass filter to estimate a signal phasor. When selecting a stop-band cut-off frequency of the low-pass filter, high frequency components generated by faults are considered. To reduce the phasor estimation delay caused by a low-pass filter, this paper proposes a low-pass filter whose settling time is reduced. An adverse effect of high frequency noise on DFT-based phasor estimation is reduced. To evaluate the performance of the proposed method, signals which are collected under a fault condition at a 345[kV] transmission system modeled by EMTP-RV are used.
Keywords
High frequency noise; Cut-off frequency; Low-pass filter; DFT; Phasor estimation;
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