Reactive power measuring method based on digital filtering
Title：
Reactive power measuring method based on digital filtering
Application Number：
 02116443
Application Date：
 2002/04/05
Announcement Date：
 2002/10/23
Pub. Date：
Publication Number：
 1375702
Announcement Number：
 1159591
Grant Date：
 2004-7-28
Granted Pub. Date：
 2004-7-28
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G01R 21/133
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Pang Hao, Zu Yunxiao, Li Dongxia
Key Words：
 Reactive power, measuring method, digital filtering
Abstract：
 The present invention relates to a method for measuring reactive power based on digital filtration, which is characterized by that firstly, the analogue voltage signal and analogue current signal measured from electric network for measuring reactive power are undergone the process of A/D conversion to obtain discrete digital voltage signal and digital current signal. Said digital voltage signal is passed through the digital phase shift filter to obtain signal u'(n), and the digital current signal i(n) is passed through the digital phase shift filter to obtain signal i'(n), said signals of u'(n) and i'(n) are multiplied to obtain signal q(n), q(n)=u'(n)X i'(n), the signal q (n) is undergone the process of D.C. filtration so as to obtain its D.C. component Q(n), i.e. reactive powder.
Claim：
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