Complete elimination of DC offset in current signals for relaying applications
- 7 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 3, 1933-1938 vol.3
- https://doi.org/10.1109/pesw.2000.847649
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.Keywords
This publication has 7 references indexed in Scilit:
- An adaptive fault locator system for transmission linesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Removal of DC offset in current and voltage signals using a novel Fourier filter algorithmIEEE Transactions on Power Delivery, 2000
- An adaptive protection scheme for advanced series compensated (ASC) transmission linesIEEE Transactions on Power Delivery, 1998
- The effect of DC offset on current-operated relaysIEEE Transactions on Industry Applications, 1998
- Removal of DC-offset in current waveforms using digital mimic filteringIEEE Transactions on Power Delivery, 1995
- Modelling of Fault-Induced Noise Signals for Computer Relaying ApplicationsIEEE Transactions on Power Apparatus and Systems, 1983
- Application of Kalman Filtering in Computer RelayingIEEE Transactions on Power Apparatus and Systems, 1981