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A DFT Based Filtering Technique to Eliminate Decaying dc and Harmonics for Power System Phasor Estimation 원문보기

KIEE international transactions on power engineering, v.5A no.2, 2005년, pp.138 - 143  

Oh Yong- Taek (School of Information Technology, Electrical Engineering, Korea Universityof Technology and Education) ,  Balamourougan V. (Dept. of Electrical and Computer Science Engineering, University of Western Ontario) ,  Sidhu T.S. (Dept. of Electrical and Computer Science Engineering, University of Western Ontario)

Abstract ▼ AI-Helper 아이콘AI-Helper

During faults, the voltage and current signals available to the relay are affected by the decaying dc component and harmonics. In order to make appropriate and accurate decisions, most of the relaying algorithms require the fundamental frequency phasor information that is immune to decaying dc effec...

주제어

#OFT   #mimic filer   #phasor estimation  

AI 본문요약
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제안 방법

  • The proposed algorithm assumes that the input signal is pre-processed by an analog anti-aliasing filter, which effectively removes very high frequency components present in the input signal. The proposed technique consists of two sets of orthogonal digital filters(Set I and Set II).
  • The proposed algorithm assumes that the input signal is pre-processed by an analog anti-aliasing filter, which effectively removes very high frequency components present in the input signal. The proposed technique consists of two sets of orthogonal digital filters(Set I and Set II). Together they eliminate the decaying de and harmonic components and, extract only the fundamental frequency component of the signal.
  • The proposed technique computes the phasors within one full cycle of the power system frequency. The technique needs three look-up tables and two digital orthogonal filter sets that are built off-line to remove the decaying de offset effect from the input signal. Ulike the full cycle DFT plus mimic filter, this algorithm can dynamically estimate the decay time constant and eliminate it from the input signal thereby producing an accurate phasor estimate.

이론/모형

  • In this paper, the phasor estimates, which are immune to decaying de and harmonics, are computed by extending the concept proposed in [11] with minimal computational requirements and which can be implemented in any modem commercial relay hardware platform. The performance of the proposed technique is compared with the most popular, digital mimic filter plus the full cycle DFT technique of phasor estimation.
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참고문헌 (11)

  1. Lathi B. P., Signal Processing and Liner Systems, Oxford University Press, New York, 2001 

  2. Sachdev. M. S, (Coordinator), IEEE Tutorial Course, Microprocessor Relays and Protection Systems, IEEE Service Center, Publication No. 97EH0269-1-PWR, 1997 

  3. Phadke, A. G., and Thorp, J. S.: 'Computer Relaying for Power Systems', Research Studies Press Ltd., Hertfordshire, UK, 1988 

  4. Phadke, A. G, Hlibka. T, Ibrahim, M, 'A Digital Computer system or EHV Substations: Analysis and Field Tests,' IEEE Trans. Power Apparatus and systems,, vol. PAS-95, No. 1, pp. 290-301, Jan/Feb 1976 

  5. Gabrial Benumouyal 'Removal of DC-Offset in Current Waveforms Using Digital Mimic Filtering', IEEE Trans. Power Delivery, vol. 10 pp. 621-630, 1995 

    상세보기 crossref

  6. Sachdev, M.S., and Baribeau, M.A.: 'A New Algorithm for Digital Impedance Relays', IEEE Trans. Power Delivery, April 1995, 10, pp- 

  7. Sachdev, M.S., and Nagpal, M: 'A Recursive Least Error Squares Algorithm for Power System Relaying and Measurement Applications', IEEE Trans. Power Delivery, July 1991, vol. 6, pp 1008-1015 

    상세보기 crossref

  8. Sachdev. M. S, H.C. Wood and N. G. Johnson, 'Kalman Filtering Applied to Power System Measurements for Relaying,' IEEE Trans on PAS, Vol. 104, No. 12, December 1985, pp. 3565-3573 

  9. Girgis. A. A, and Brown. R. G., 'Application of Kalman Filtering in Computer Relaying' IEEE Trans. On Power Apparatus and Systems, Vol. 100, No. 7, July 1981, pp. 3387-3397 

    상세보기 crossref

  10. Yong Guo, Malden Kezunovic, and Chen. D., 'Simplified Algorithms For the Removal of the Effect of Exponentially Decaying DC-Offset on the Fourier Algorithms', IEEE Trans. Power Delivery, Vol. 18, No. 3, July 2003 

  11. Sidhu, T.S.; Zhang, X.; Albasri, F.; Sachdev, M.S., 'Discrete-Fourier-transform-based technique for removal of decaying DC offset from phasor estimates', Generation, Transmission and Distribution, IEE Proceeding , Vol. 150, Issue: 6, 12 Nov. 2003, pp. 745 ？ 752 

    상세보기 crossref

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