Harmonious wave detecting method in power system

The invention discloses a harmonious wave detecting method in a power system. On the basis of five-layered db 40 wavelet packet transformation, hilbert transform is applied to perform frequency shift operation; every harmonic component is transferred to a side frequency band with relatively high pre...

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Bibliographic Details
Main Authors XIAO XIAYING, LI KAICHENG, WANG LINGYUN
Format Patent
LanguageChinese
English
Published 31.05.2017
Subjects
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:The invention discloses a harmonious wave detecting method in a power system. On the basis of five-layered db 40 wavelet packet transformation, hilbert transform is applied to perform frequency shift operation; every harmonic component is transferred to a side frequency band with relatively high precision, so as to perform wavelet packet decomposition and signal reconstruction, thus the high-precision detection of every harmonic wave is realized. The method includes steps of S01, moving every frequency classification of a former signal to 25-75 Hz frequency sections by hilbert transform; S02, respectively performing wavelet packet decomposition and reconstruction on every component after moving frequency; S03, respectively moving frequency of every restructured component and restoring to original frequency section; S04, acquiring the harmonious wave detecting result according to the recorded waveform data. The method provided by the invention eliminates the adverse influence of wavelet filter aliasing of the
Bibliography:Application Number: CN2017185673