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Combined steam turbine and gas turbine power plant control system

  • US 3,879,616 A
  • Filed: 09/17/1973
  • Issued: 04/22/1975
  • Est. Priority Date: 09/17/1973
  • Status: Expired due to Term
First Claim
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1. A control system for a combined cycle power plant including at least one gas turbine driving a first load and a steam turbine driving a second load;

  • a heat recovery steam generator for generating steam from the gas turbine exhaust heat and a steam header interconnecting the heat recovery steam generator and the steam turbine;

    the control system further comprising;

    a. a gas turbine control system for regulating a fuel supply to the gas turbine in accordance with a load demand setpoint supplied thereto;

    b. a steam turbine control system for positioning a steam turbine control valve in response to the steam pressure in said steam header;

    c. first and second load transducers for measuring, respectively, the loads on said gas turbine and said steam turbine; and

    , d. a combined power plant control system for comparing a load demand setpoint for the combined plant with the sum of the signals from the first and second load transducers to provide a combined plant load error, and to adjust the load setpoint of said gas turbine control system in accordance with the combined plant load error.

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