지수 감쇄하는 DC 옵셋 영향을 제거한 푸리에 변환 기반 페이져 연산 기법

다국어 초록 (Multilingual Abstract)

This paper proposes a new Fourier transform-based phasor estimation method to eliminate the adverse influence of the exponentially decaying dc offsets when Discrete Fourier Transform (DFT) is used to calculate the phasor of the fundamental frequency component in a relaying signal. By subtracting the result of odd-sample-set DFT from the result of even-sample-set DFT, the information of de offsets can be obtained. Two de offsets in a relaying signal are treated as one dc offset which is piecewise approximated in one cycle data window. The effect of the dc offsets can be eliminated by the approximated dc offset. The performance of the proposed algorithm is evaluated by using computer-simulated signals and EMTP-generated signals. The algorithm is also tested on a hardware board with TMS320C32 microprocessor. The evaluation results indicate that the proposed algorithm has the stable and accurate eliminating performance even if the input signal contains two decaying de components having different time constants.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 개선된 푸리에 알고리즘
• 3. 사례 연구
• 4. 결론
• 감사의 글
• 참고문헌
• 저자소개

참고문헌 (Reference)

1 Yong Guo, "Simplified algorithms for removal of the effect of exponentially decaying DC offset on the Fourier algorithm" 18 (18): 711-717, 2003

2 G. Benmouyal, "Removal of DC offset in current waveforms using digital mimic filtering" 10 (10): 621-630, 1995

3 Jyh-Cherng Gu, "Removal of DC offset in current and voltage signals using a novel Fourier filter algorithm" 15 (15): 73-79, 2000

4 Stanley H. Horowitz, "Power System Relaying" Research Studies Press 56-, 1992

5 S. R. Nam, "Modified Notch Filter-based Instantaneous Phasor Estimation for High-Speed Distance Protection" 89 (89): 311-317, 2007

6 T. S. Sidhu, "Discrete -Fourier-transform-based technique for removal of decaying DC offset from phasor estimates" 150 (150): 745-752, 2003

7 Soon-Ryul Nam, "An Analytic Method for Measuring Accurate Fundamental Frequency Components" 2002