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Synchronization fuel control for gas turbine-driven AC generator by use of maximum and minimum fuel signals

  • US 4,492,874 A
  • Filed: 04/26/1982
  • Issued: 01/08/1985
  • Est. Priority Date: 04/26/1982
  • Status: Expired due to Term
First Claim
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1. An automatic synchronization fuel control for guiding an AC generator having an output into synchronization with an AC power system, said output of said generator and said power system each having respective AC voltages associated therewith, said generator being of a type which is driven by a turbine, said synchronization fuel control comprising:

  • first means for determining an instantaneous frequency difference and an instantaneous phase difference between said power system voltage and said generator output voltage;

    second means for providing one of a first signal command for supplying a fixed predetermined minimum fuel flow to said turbine and a second signal command for supplying a fixed predetermined maximum fuel flow to said turbine;

    said fixed predetermined maximum fuel flow being of a first value which is effective to produce a substantially constant acceleration of said generator, and said fixed predetermined minimum fuel flow being of a second value which is effective to produce a substantially constant deceleration of said generator;

    third means for substantially continuously comparing said instantaneous frequency difference and said instantaneous phase difference; and

    fourth means for determining, in accordance with predetermined functions, whether said second means should provide said first signal or said second signal, said predetermined functions being selected so as to guide said generator to an optimal synchronization point at which a predetermined frequency difference and a predetermined phase difference exist.

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