Reactive power measurement method based on digital filtering and measurement system thereof
Title：
Reactive power measurement method based on digital filtering and measurement system thereof
Application Number：
 200610002150
Application Date：
 2006/01/19
Announcement Date：
 2006/07/12
Pub. Date：
Publication Number：
 1800864
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G01R 21/133
Applicant(s)：
 Tsinghua University
Inventor(s)：
 Pang Hao, Wang Zanji
Key Words：
 digital filtering, reactive power, measurement method, measurement system
Abstract：
 The invention relates to a reactive power measurement method based on digital filter, which comprises: first, converting a couple of analog voltage and current signal into digital format; then, treating the signals with four digital phase-shift filters to obtain a couple of phase-shifted voltage signals and current signals; taking calculation and dc filter to the four signals to measure the reactive power data. This invention reduces request to digital phase-shift filter, and has small signal ripple in pure sine or with a little harmonic circuit as well as fast measurement speed.
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