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Local maintenance controller for gas turbine power plants having a primary control system

  • US 3,975,902 A
  • Filed: 06/04/1974
  • Issued: 08/24/1976
  • Est. Priority Date: 06/04/1974
  • Status: Expired due to Term
First Claim
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1. For a gas turbine power plant having a primary control system which develops a control signal output to control fuel flow to the gas turbine, backup control apparatus comprising:

  • a. input means for receiving information from the plant;

    b. speed control means connected to said input means for developing an error speed signal;

    c. temperature control means connected to said input means for developing an error temperature signal;

    d. low selection means connected to said speed control and said temperature control means for developing a backup control signal output which is proportionally related to the lower of the two error signals received;

    e. tracking means for monitoring, comparing and adjusting the backup control signal output with respect to the primary control signal output, connected between said input means and said low selection means;

    f. speed/load reference generating means for developing a speed reference adjustment as a function of the backup control signal output connected between said tracking means and said speed control means;

    g. fuel valve monitoring means for monitoring, comparing and transmitting the fuel valve position demand signals developed by the primary control system connected between and to said tracking means and said low selection means;

    h. output means for receiving all information developed by said backup control apparatus connected to said low selector means and said fuel valve monitoring means;

    i. transfer means connected to said output means and the output of the primary control system for switching the backup control apparatus outputs to the plant when required or passing the outputs of the primary control system to the plant when necessary;

    j. transfer initiating means connected to said transfer means, said tracking means, said reference generating means and said fuel valve monitoring means for initiating action of said connected means in contemplation of transfer from the primary control system to said backup control apparatus; and

    k. means for interfacing said backup control apparatus and the primary control system.

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