公开(公告)号：US20180059154A1

公开(公告)日：2018-03-01

申请号：US15670602

申请日：2017-08-07

申请人： Schneider Electric Industries SAS

发明人： Julien MECREANT ,  Christophe GHAFARI ,  Bertrand RAISON ,  Raphael CAIRE

IPC分类号： G01R23/00 ,  G01R23/12 ,  G01R19/25

CPC分类号： G01R23/005 ,  G01R19/2506 ,  G01R23/02 ,  G01R23/12 ,  G01R23/15 ,  H02H3/46

摘要： A method determines the frequency of an alternating input signal includes storing the input signal, sampling the input signal at a first sampling frequency, a first calculation and a first angular comparison of two phasors representing the input signal at two respective instants, as a function of the input signal sampled at the first sampling frequency, estimating the frequency of the input signal, and searching for a modification of frequency of the input signal. When a modification is detected the method includes, determining a second sampling frequency, sampling the stored input signal with the second sampling frequency, a second calculation and a second angular comparison of two phasors representing the input signal, at two respective instants, as a function of the input signal sampled at the second sampling frequency and of the stored input signal sampled at the second sampling frequency, and estimating the frequency of the input signal.