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A Method for Estimating an Instantaneous Phasor Based on a Modified Notch Filter

Nam Soon-Ryul    (Next-Generation Power Technology Center(NPTC) and the Depart-ment of Electrical Engineering, Myonjgji University   ); Sohn Jin-Man    (School of Electrical Engineering, Seoul National University   ); Kang Sang-Hee    (Next-Generation Power Technology Center(NPTC) and the Depart-ment of Electrical Engineering, Myonjgji University   ); Park Jong-Keun    (School of Electrical Engineering, Seoul National University  );
  • 초록

    A method for estimating the instantaneous phasor of a fault current signal is proposed for high-speed distance protection that is immune to a DC-offset. The method uses a modified notch filter in order to eliminate the power frequency component from the fault current signal. Since the output of the modified notch filter is the delayed DC-offset, delay compensation results in the same waveform as the original DC-offset. Subtracting the obtained DC-offset from the fault current signal yields a sinusoidal waveform, which becomes the real part of the instantaneous phasor. The imaginary part of the instantaneous phasor is based on the first difference of the fault current signal. Since a DC-offset also appears in the first difference, the DC-offset is removed trom the first difference using the results of the delay compensation. The performance of the proposed method was evaluated for a-phase to ground faults on a 345kV 100km overhead transmission line. The Electromagnetic Transient Program was utilized to generate fault current signals for different fault locations and fault inception angles. The performance evaluation showed that the proposed method can estimate the instantaneous phasor of a fault current signal with high speed and high accuracy.


  • 주제어

    DC-offset .   Distance protection .   Estimation .   First difference .   Instantaneous phasor .   Modified notch filter.  

  • 참고문헌 (8)

    1. G. Benmouyal, 'Removal of DC-offset in current waveforms using digital mimic filtering,' IEEE Trans. Power Delivery, Vol. 10, No. 2, April 1995, pp. 621- 630 
    2. M. S. Sachdev, and M. A. Baribeau, 'A new algorithm for digital impedance relays,' IEEE Trans. Power Apparatus and Systems, Vol. PAS-98, No. 4, December 1979, pp. 253-260 
    3. M. S. Sachdev, and M. Nagpal, 'A recursive least error squares algorithm for power system relaying and measurement applications,' IEEE Trans. Power Delivery, Vol. 6, No. 3, July 1991, pp. 1008-1015 
    4. J. C. Gu, and S. L. Yu, 'Removal of DC-offset in current and voltage signals using a novel Fourier filter algorithm,' IEEE Trans. Power Delivery, Vol. 15, No. 1, January 2000, pp. 73-79 
    5. T. S. Sidhu, X. Zhang, F. Albasri, and M. S. Sachdev, 'Discrete-Fourier-transform-based technique for removal of decaying DC offset from phasor estimates,' IEE Proc.-Gener. Transm. Distrib., Vol. 150, No. 6, Nov. 2003, pp. 745-752 
    6. Yong Guo, Kezunovic. M., and Deshu Chen, 'Simplified algorithms for removal of the effect of exponentially decaying DC-offset on the Fourier algorithm,' IEEE Trans. Power Delivery, Vol. 18, No. 3, July 2003, pp. 711-717 
    7. G. Benmouyal, 'Frequency-Domain Characterization of Kalman Filters as Applied to Power System Protection,' IEEE Trans. On Power Delivery, Vol. 7, July 1992, pp. 1129-1138 
    8. A. A. Girgis and R. G. Brown, 'Application of Kalman Filtering in Computer Relaying,' IEEE Trans, PAS- 100, No. 7, July 1981, pp. 3387-3397 

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