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Control system and method for the parallel operation of voltage regulators

  • US 5,498,954 A
  • Filed: 09/07/1994
  • Issued: 03/12/1996
  • Est. Priority Date: 04/01/1992
  • Status: Expired due to Fees
First Claim
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1. In an electrical power distribution system, a method for controlling at least two voltage regulators, each regulator having a tap changer for varying tap positions, comprising the steps of:

  • operating the voltage regulators in parallel;

    determining an output voltage of each regulator;

    determining a reactive power of each regulator;

    determining, as a function of the output voltage and the reactive power of the regulators, whether each regulator is operating within an allowable error voltage bandwidth; and

    determining a tap position for each regulator and performing calculations for each regulator using the determined tap position;

    varying, based on the calculations, the tap position of each regulator which is operating outside the allowable error voltage bandwidth to change the regulator output voltage in a direction towards the allowable error voltage bandwidth.

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