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AssigneeWestinghouse Electric Corp.
InventorsJack R. Smith, Terry J. Reed
Estimating the term…
A combined cycle electric power plant includes gas and steam turbines and steam generators and a digital/analog control system. The control system includes an automatic control and a backup control which are interfaced to operate the gas turbine throttle valve for speed and load control purposes and to provide for manual/auto transfers. The backup control includes a startup control which functions on the basis of a feedforward fuel schedule ramp function. Between ignition speed and 78% synchronous speed, the ramp function is a linear function of fuel demand versus speed with a predetermined slope. From 78% of synchronous speed to idle speed, the ramp function is a linear function with a lesser slope.
A combined cycle electric power plant comprising at least one gas turbine, means for generating steam in response to heat energy from said gas turbine, a steam turbine driven by steam supplied to it from said steam generating means, means for generating electric power under the driving power of said turbines, means for controlling the operation of said turbines and said steam generating means, said controlling means including a gas turbine control system having an automatic control and a backup control, said gas turbine control system including means for controlling the flow of fuel to said gas turbine under automatic and backup control, means for transferring between said automatic and backup controls under predetermined conditions, said backup control including means for manually raising and lowering a fuel demand signal applied to said fuel control means at least to control gas turbine load during the load mode of operation, means for limiting the operation of said fuel flow controlling means to limit the turbine outlet gas temperature, and circuit means for generating a feed-forward startup signal which increases as a function of time and which is applied to said fuel flow controlling means to provide for turbine acceleration normally without operation of said temperature limiting means to a speed at which synchronization control is to occur.
A gas turbine electric power plant comprising a compressor section and a turbine section, a plurality of combustors for energizing the driving gas flow for the turbine section, means for generating electric power under the driving power of the turbine, a gas turbine control system having an automatic control and a backup control, means afor controlling the flow of fuel to said gas turbine under automatic and backup control, means for transferring between said automatic and backup controls under predetermined conditions, said backup control including means for manually raising and lowering a fuel demand signal applied to said fuel control means at least to control gas turbine load during the load mode of operation, means for limiting the operation of said fuel flow controlling means to limit the turbine outlet gas temperature, circuit means for generating a feedforward startup signal which increases as a function of time and which is applied to said fuel flow controlling means to provide for turbine acceleration without operation of said temperature limiting means to a speed at which synchronization control is to occur, means for generating a signal representative of gas turbine speed, and said startup signal generating means responding to said speed signal generating means to generate the feedforward startup signal according to a first curve over one speed range and according to a second curve over another speed range.
A control system for an electric power plant gas turbine comprising an automatic control and a backup control, means for controlling the flow of fuel to said gas turbine under automatic and backup control, means for transferring between automatic and backup controls under predetermined conditions, said backup control including means for manually raising and lowering a fuel demand signal applied to said fuel control means at least to control gas turbine load during the load mode of operation, means for limiting the operation of said fuel flow controlling means to limit the turbine outlet gas temperature, circuit means for generating a feedforward startup signal which increases as a function of time and which is applied to said fuel flow controlling means to provide for turbine acceleration without operation of said temperature limiting means to a speed at which synchronization control is to occur, means for generating a signal representative of gas turbine speed, and said startup signal generating means responding to said speed signal generating means to generate the feedforward startup signal according to a first curve over one speed range and according to a second curve over another speed range.
Dependencies are inferred from the claim text.