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Device and a method for voltage control in an electric transmission network

  • US 20040052015A1
  • Filed: 10/07/2003
  • Published: 03/18/2004
  • Est. Priority Date: 11/30/2000
  • Status: Active Grant
First Claim
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1. A device for control of a compensator (SVC), connected to a polyphase electric transmission network (NW), for reactive electric power in dependence on a voltage ({overscore (V)}abc) sensed in the transmission network, the device having a voltage controller (7, 8) which, in dependence on the difference of a reference value (V,ref) for said voltage and its sensed value, forms a reference value (QCR) for a reactive power flow (QC) through the compensator, characterized in that the device comprises transformation means (3, 4, 11, 12, 13), which represent the sensed voltage as a voltage vector ({overscore (V)}dq) in a rotating two-phase system of coordinates and forms a compensation signal (Sc) in dependence on a sensed change of the angular position of the voltage vector in the two-phase system of coordinates, and further comprises summation means (9) for forming the reference value for reactive power flow through the compensator in dependence on the compensation signal.

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