Invention Application
US20160334446A1 METHOD AND APPARATUS FOR DETECTING VECTOR SHIFT 审中-公开
用于检测矢量移位的方法和装置

  • Patent Title: METHOD AND APPARATUS FOR DETECTING VECTOR SHIFT
  • Patent Title (中): 用于检测矢量移位的方法和装置
  • Application No.: US15097067
    Application Date: 2016-04-12
  • Publication No.: US20160334446A1
    Publication Date: 2016-11-17
  • Inventor: Frej Suomi
  • Applicant: ABB Technology AG
  • Priority: EP15167513.9 20150513
  • Main IPC: G01R23/165
  • IPC: G01R23/165 G01R23/02
METHOD AND APPARATUS FOR DETECTING VECTOR SHIFT
Abstract:
A method and an apparatus for detecting a vector shift in an AC power system, the apparatus comprising frequency measuring means (10) adapted to determine a frequency of the AC power system, derivation means (20) adapted to determine a time derivative of the frequency, filtering means (30) adapted to filter the time derivative of the frequency, and detection means (40, 50, 60, 70) adapted to calculate time derivatives for the filtered time derivatives of the frequency over a time period having the length of the fundamental period of the AC power system, to determine a number of positive and negative time derivatives among the calculated time derivatives, and to detect a vector shift in the AC power system in response to an absolute value of a difference between the determined number of positive time derivatives and negative time derivatives exceeding a predetermined threshold value.
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