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Load control system and method of combined cycle turbine plants

  • US 4,532,761 A
  • Filed: 09/09/1983
  • Issued: 08/06/1985
  • Est. Priority Date: 09/10/1982
  • Status: Expired due to Term
First Claim
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1. A load control system of a combined cycle turbine plant including a plurality of single shaft type combined cycle systems, said load control system comprising:

  • a plant load setter for producing an output setting a desired plant load;

    a load detector for indicating actual plant output;

    a first signal generator for comparing said desired plant load set to said actual plant output and generating an output signal when a difference between said desired plant load set and said actual plant output becomes less than a predetermined value;

    a shaft value means for producing an output indicating a set value of load of at least one shaft whose load variation rate changes;

    a shaft running number indicator for providing an output indicating a number of running shafts;

    a multiplier for producing an output indicative of a product of said shaft value means output and said shaft running number indicator output;

    a subtractor for producing an output indicating a difference between said multiplier means output and said load detector output;

    a second signal generator producing an output signal when said output of said subtractor means becomes less than a predetermined value;

    means for calculating a number of shafts to be stopped in accordance with a decrease in the load set;

    means for detecting an interval in which shafts which continue running are to be maintained at a predetermined load; and

    shaft control means responsive to said first signal generator or said second signal generator and said calculating means for increasing or decreasing the number of running shafts to make the number of stopped shafts equal to that determined by said calculating means, said shaft control means including means for increasing the loads of the shafts which continue running in accordance with either one of a signal generated by said first signal generator or a signal generated by said running interval detecting means.

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