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Coordinated control system for an electric power plant

  • US 4,287,430 A
  • Filed: 01/18/1980
  • Issued: 09/01/1981
  • Est. Priority Date: 01/18/1980
  • Status: Expired due to Term
First Claim
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1. In a power plant having a steam turbine driving a generator, a furnace for generating steam to drive the turbine, separators to separate the water from the steam in the output of the furnace, a feedwater pump to pump water to said furnace, and a bypass system to collect the water separated out by said separators and recirculate the water to said furnace, said bypass system operating during start-up to a predetermined load set point and going out of service when the load rises above said predetermined set point;

  • the improvement comprising;

    means to provide a load demand signal, means to provide a signal representing the pressure at the throttle valves of said steam turbine, control signal generating means operating to provide a signal varying in accordance with the difference between the pressure at said throttle valves and the pressure required at said throttle valves to provide the load represented by said load demand signal with the turbine valves at a predetermined start-up position, means responsive to said control signal to control the firing rate of said furnace in accordance with said control signal, and means responsive to said control signal to control said feedwater pump to pump water to said furnace at a rate corresponding to said control signal only after said bypass system is out of service.

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