Charging pile harmonic wave detection algorithm based on windowing interpolation FFT and wavelet packet

The invention discloses a charging pile harmonic wave detection algorithm based on a windowing interpolation FFT and a wavelet packet; the algorithm comprises the following steps: windowing interpolation FFT transformation, using a Blair window and double-spectral line interpolation to carry out FFT...

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Bibliographic Details
Main Authors DAI HUI, WANG XUAN, TANG GUOXIANG
Format Patent
LanguageChinese
English
Published 20.04.2016
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTEDFOR SPECIFIC APPLICATION FIELDS
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:The invention discloses a charging pile harmonic wave detection algorithm based on a windowing interpolation FFT and a wavelet packet; the algorithm comprises the following steps: windowing interpolation FFT transformation, using a Blair window and double-spectral line interpolation to carry out FFT transformation for an obtained signal, thus obtaining various harmonic waves in the signal; selecting a to-be analyzed frequency range, extracting harmonic waves having big influence on power grid characteristics, and neglecting harmonic waves with almost no influence, thus improving detection instantaneity; using the wavelet packet to decompose and reconstruct the selected frequency range , applying DB3 wavelet packet transformation on the signal, thus obtaining start-stop times of various generated harmonic waves. The algorithm can fast and accurately detect each harmonic wave of the electric vehicle charging pile, and can determine harmonic wave generation start-stop times.
Bibliography:Application Number: CN20151860753