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Operation control apparatus and operation control method for single-shaft combined plant

  • US 6,817,186 B2
  • Filed: 04/18/2003
  • Issued: 11/16/2004
  • Est. Priority Date: 09/19/2002
  • Status: Active Grant
First Claim
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1. An operation control apparatus for application to a single-shaft combined plant, said single-shaft combined plant comprising a gas turbine, a power generator, and a steam turbine connected together by a single shaft, and a clutch provided on said shaft for connecting said gas turbine and said power generator to said steam turbine and disconnecting said gas turbine and said power generator from said steam turbine, said steam turbine being supplied with steam from an exhaust gas boiler for generating steam by use of an exhaust gas from said gas turbine,said operation control apparatus being adapted to find an inlet guide vane opening command for controlling an opening of an inlet guide vane provided in a compressor of said gas turbine and control the opening of said inlet guide vane;

  • to find a burner bypass valve opening command for controlling an opening of a burner bypass valve provided in a burner of said gas turbine and control the opening of said burner bypass valve; and

    to find a pilot ratio, a ratio between a main fuel and a pilot fuel fed to said burner, and control openings of a main fuel flow control valve and a pilot fuel flow control valve in accordance with said pilot ratio, said operation control apparatus comprising;

    a computing facility unit for converting a steam pressure of steam flowing into said steam turbine into a steam turbine output;

    subtracting said steam turbine output from a power generator output of said power generator to find a gas turbine output; and

    finding a fuel flow rate command of a value corresponding to a deviation of said power generator output from a target power generator output;

    a state signal generator for outputting an engaged state signal when said clutch is engaged;

    outputting a disengaged state signal when said clutch is disengaged;

    increasing a value of said engaged state signal gradually and also decreasing a value of said disengaged state signal gradually to zero in a predetermined transitional period starting at a time of engagement when said clutch in disengagement is engaged; and

    decreasing the value of said engaged state signal gradually to zero and also increasing the value of said disengaged state signal gradually in a predetermined transitional period starting at a time of disengagement when said clutch in engagement is disengaged;

    an inlet guide vane opening command computing facility unit which has a first inlet guide vane opening command computing function capable of finding an optimal inlet guide vane opening command from said gas turbine output in an engaged state of said clutch, and a second inlet guide vane opening command computing function capable of finding an optimal inlet guide vane opening command from said gas turbine output in a disengaged state of said clutch; and

    which combines said inlet guide vane opening commands, found by said first and second inlet guide vane opening command computing functions, at rates corresponding to the values of said engaged state signal and said disengaged state signal to compute a final inlet guide vane opening command;

    a burner bypass valve opening command computing facility unit which has a first burner bypass valve opening command computing function capable of finding an optimal burner bypass valve opening command from said gas turbine output in the engaged state of said clutch, and a second burner bypass valve opening command computing function capable of finding an optimal burner bypass valve opening command from said gas turbine output in the disengaged state of said clutch; and

    which combines said burner bypass valve opening commands, found by said first and second burner bypass valve opening command computing functions, at rates corresponding to the values of said engaged state signal and said disengaged state signal to compute a final burner bypass valve opening command; and

    a pilot ratio computing facility unit which has a first pilot ratio computing function capable of finding an optimal pilot ratio from said fuel flow rate command in the engaged state of said clutch, and a second pilot ratio computing function capable of finding an optimal pilot ratio from said fuel flow rate command in the disengaged state of said clutch; and

    which combines said pilot ratios, found by said first and second pilot ratio computing functions, at rates corresponding to the values of said engaged state signal and said disengaged state signal to compute a final pilot ratio.

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