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

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  );
  • 초록

    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 effect and harmonics. The conventional Fourier ph as or estimation algorithm is affected by the presence of decaying-exponential transients in the fault signal. This paper presents a modified Fourier algorithm, which effectively eliminates the decaying dc component and the harmonics present in the fault signal. The decaying dc parameters are estimated by means of an out-of-band filtering technique. The decaying dc offset and harmonics are removed by means of a simple computational procedure that involves the design of two sets of Orthogonal digital OFT filters tuned at different frequencies and by creating three off-line look-up tables. The technique was tested for different decay rates of the decaying dc component. It was also compared with the conventional mimic plus the full cycle OFT algorithm. The results indicate that the proposed technique has a faster convergence to the desired value compared to the conventional mimic plus OFT algorithms over a wide range of decay rates. In all cases, the convergence to the desired value was achieved within one cycle of the power system frequency.


  • 주제어

    OFT .   mimic filer .   phasor estimation.  

  • 참고문헌 (11)

    1. 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 
    2. 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 
    3. 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 
    4. Sachdev. M. S, (Coordinator), IEEE Tutorial Course, Microprocessor Relays and Protection Systems, IEEE Service Center, Publication No. 97EH0269-1-PWR, 1997 
    5. Gabrial Benumouyal 'Removal of DC-Offset in Current Waveforms Using Digital Mimic Filtering', IEEE Trans. Power Delivery, vol. 10 pp. 621-630, 1995 
    6. 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 
    7. 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 
    8. Lathi B. P., Signal Processing and Liner Systems, Oxford University Press, New York, 2001 
    9. Sachdev, M.S., and Baribeau, M.A.: 'A New Algorithm for Digital Impedance Relays', IEEE Trans. Power Delivery, April 1995, 10, pp- 
    10. Phadke, A. G., and Thorp, J. S.: 'Computer Relaying for Power Systems', Research Studies Press Ltd., Hertfordshire, UK, 1988 
    11. 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 

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