NDLI: Complete elimination of DC offset in current signals for relaying applications

Content Provider	IEEE Xplore Digital Library
Author	Jun-Zhe Yang Chih-Wen Liu
Copyright Year	2000
Description	Author affiliation: Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan (Jun-Zhe Yang)
Abstract	This paper proposes a new method for exact estimation of DC offset in current signals such that DC offset can be completely eliminated for relaying applications. This new method, we called smart discrete Fourier transform (SDFT), based on discrete Fourier transform (DFT) keeps all advantages of DFT, and smartly avoids the defects resulting from frequency scales that can't match signal characteristics. Moreover, we use smoothing windows to filter noise in practice. The difference between SDFT and other methods, which use smoothing windows, is that SDFT can alleviate the difficulties of phase shift and amplitude decay caused by smoothing windows. Recursive and half-cycle computing can also be used in SDFT, so SDFT is very suitable for use in real-time. To validate the claimed benefits of SDFT, the performances of SDFT algorithm are demonstrated with the data generated by EMTP simulator. The simulation results are very encouraging.
Starting Page	1933
Ending Page	1938
File Size	377931
Page Count	6
File Format	PDF
ISBN	0780359356
DOI	10.1109/PESW.2000.847649
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-01-23
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays Smoothing methods Discrete Fourier transforms Power system protection Power system relaying Fault currents Power system faults Protective relaying Power system simulation Frequency estimation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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