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논문 기본 정보

자료유형
학술저널
저자정보
Linsong Luo (Tianjin Polytechnic University) Huixin Tian (Tianjin Polytechnic University) Fengjiang Wu (Harbin Institute of Technology)
저널정보
전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.15 No.4
발행연도
2015.7
수록면
1,085 - 1,092 (8page)

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초록· 키워드

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In this paper, the expressions of the estimated information of a single-phase enhanced phase-locked loop (EPLL), when input signal contains harmonics and a DC offset while the fundamental component takes step changes, are derived. The theoretical analysis results indicate that in the estimated information, the n<SUP>th</SUP>-order harmonics cause n+1th-order periodic ripples, and the DC offset causes a periodic ripple at the fundamental frequency. Step changes of the amplitude, phase angle and frequency of the fundamental component cause a transient periodic ripple at twice the frequency. These periodic ripples deteriorate the performance of the EPLL. A hybrid filter based EPLL (HF-EPLL) is proposed to eliminate these periodic ripples. A delay signal cancellation filter is set at the input of the EPLL to cancel the DC offset and even-order harmonics. A sliding Goertzel transform-based filter is introduced into the amplitude estimation loop and frequency estimation loop to eliminate the periodic ripples caused by the residual input odd-order harmonics and step change of the input fundamental component. The parameter design rules of the two filters are discussed in detail. Experimental waveforms of both the conventional EPLL and the proposed HF-EPLL are given and compared with each other to verify the theoretical analysis and advantages of the proposed HF-EPLL.

목차

Abstract
I. INTRODUCTION
II. EFFECTS OF HARMONICS, DC OFFSET AND STEP CHANGES ON THE EPLL
III. IMPROVED EPLL BASED ON A HYBRID FILTER
IV. EXPERIMENTAL RESULTS AND COMPARISON
V. CONCLUSION
REFERENCES

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