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METHOD FOR VOLTAGE INSTABILITY LOAD SHEDDING USING LOCAL MEASUREMENTS

  • US 20080086239A1
  • Filed: 10/09/2006
  • Published: 04/10/2008
  • Est. Priority Date: 10/09/2006
  • Status: Active Grant
First Claim
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1. A method of voltage instability load shedding, comprising the steps of:

  • (a) measuring current and voltage waveforms of an electrical system at a local system bus;

    (b) estimating the Thevenin equivalent admittance (Y) based on Kalman filter techniques;

    (c) calculating a voltage stability margin index using the magnitude of the voltage wave form, the determined Thevenin admittance, and the load at the local system bus;

    (d) comparing the calculated voltage stability margin index with a predetermined threshold value; and

    (e) utilizing the comparison between the calculated voltage stability margin index with the predetermined threshold value to determine whether to initiate a load shedding action.

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