A Linear-Correction Algorithm for Quasi-Synchronous DFT

Spectral leakage in the harmonic measured by quasi-synchronous DFT (QSDFT) is mainly due to short-range leakage caused by deviation in the signal frequency. By analysing the short-range-leakage characteristic of QSDFT, a linear-correction algorithm (LCQS) for QSDFT’s harmonic-analysis results is pro...

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Bibliographic Details
Published inMathematical problems in engineering Vol. 2018; no. 2018; pp. 1 - 9
Main Authors Zhou, Genyuan, Ou, Yun, Wang, Jianyu, Fu, Zhongjun, Zhao, Xiaorong
Format Journal Article
LanguageEnglish
Published Cairo, Egypt Hindawi Publishing Corporation 01.01.2018
Hindawi
Hindawi Limited
Subjects
Algorithms
Automation
Computer simulation
Electric power
Engineering
Frequency analysis
Frequency ranges
Harmonic analysis
Leakage
Least squares method
Pricing policies
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Summary:Spectral leakage in the harmonic measured by quasi-synchronous DFT (QSDFT) is mainly due to short-range leakage caused by deviation in the signal frequency. By analysing the short-range-leakage characteristic of QSDFT, a linear-correction algorithm (LCQS) for QSDFT’s harmonic-analysis results is proposed. LCQS contains two linear-correction equations: an amplitude-correction equation and an initial-phase-angle-correction equation. The former is constructed by the least-squares method, whereas the latter is generated based on the linear error characteristic of the QSDFT harmonic phase. Simulation and experimental results indicate that this proposed algorithm can efficiently increase the accuracy of the harmonic parameters over a wide frequency range by minimizing the short-range spectral leakage.
ISSN:1024-123X
1563-5147
DOI:10.1155/2018/1268905