The Transactions of the Korean Institute of Electrical Engineers A (대한전기학회논문지:전력기술부문A)

The Korean Institute of Electrical Engineers (대한전기학회)
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An Analytic Method for Measuring Accurate Fundamental Frequency Components

기본파 성분의 정확한 측정을 위한 해석적 방법

  • 남순열 (서울대학교 전기공학부) ;
  • 강상희 (명지대학교 전기공학과/차세대 전력기술 연구센터) ;
  • 박종근 (서울대학교 전기공학부/차세대 전력기술 연구센터)
  • Published : 2002.04.01
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Abstract

This paper proposes an analytic method for measuring the accurate fundamental frequency component of a fault current signal distorted with a DC-offset, a characteristic frequency component, and harmonics. The proposed algorithm is composed of four stages: sine filer, linear filter, Prony's method, and measurement. The sine filter and the linear filter eliminate harmonics and the fundamental frequency component, respectively. Then Prony's method is used to estimate the parameters of the DC-offset and the characteristic frequency component. Finally, the fundamental frequency component is measured by compensating the sine-filtered signal with the estimated parameters. The performance evaluation of the proposed method is presented for a-phase to around faults on a 345 kV 200 km overhead transmission line. The EMTP is used to generate fault current signals under different fault locations and fault inception angles. It is shown that the analytic method accurately measures the fundamental frequency component regardless of the characteristic frequency component as well as the DC-offset.

Keywords

References

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