Combined cycle electric power plant with coordinated steam load distribution control
First Claim
1. A control system for an electric combined cycle power plant having at least a gas turbine and a steam turbine and a heat recovery steam generator interconnected in a heat cycle to provide motive energy for driving said turbines, means for generating electric power in response to mechanical drive power from said turbines, said control system comprising a gas turbine control and a steam turbine control each being a portion of a digital control center and an analog control center, said digital and analog control centers providing means for a plurality of control modes at respective different levels of automation, the steam turbine control including means for providing at least two modes of control for automatically loading and unloading said steam turbine as a function of sensed steam pressure at a predetermined point in said steam turbine.
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Accused Products
Abstract
A combined cycle electric power plant includes gas and steam turbines and a steam generator for recovering the heat in the exhaust gases exited from the gas turbine and for using the recovered heat to produce and supply steam to the steam turbine. The steam generator includes a superheater tube through which a fluid, e.g. water, is directed to be additionally heated into superheated steam by the exhaust gas turbine gases. An afterburner further heats the exhaust gas turbine gases passed to the superheater tube. The temperature of the gas turbine exhaust gases is sensed for varying the fuel flow to the afterburner by a fuel valve, whereby the temperatures of the gas turbine exhaust gases and therefore of the superheated steam, are controlled. Loading and unloading of the steam turbine is accomplished automatically in coordinated plant control as a function of steam throttle pressure.
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Citations
15 Claims
- 1. A control system for an electric combined cycle power plant having at least a gas turbine and a steam turbine and a heat recovery steam generator interconnected in a heat cycle to provide motive energy for driving said turbines, means for generating electric power in response to mechanical drive power from said turbines, said control system comprising a gas turbine control and a steam turbine control each being a portion of a digital control center and an analog control center, said digital and analog control centers providing means for a plurality of control modes at respective different levels of automation, the steam turbine control including means for providing at least two modes of control for automatically loading and unloading said steam turbine as a function of sensed steam pressure at a predetermined point in said steam turbine.
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5. A control system for an electric combined cycle power plant having at least a gas turbine and a steam turbine and a heat recovery steam generator interconnected in a heat cycle to provide motive energy for driving said turbines, means for generating electric power in response to mechanical drive power from said turbines, said control system comprising:
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a. means for coordinating generation of load control signals for controlling said gas turbine and said steam turbine; b. means for generating steam load rate control signals as a selected function of a predetermined steam turbine operating condition; c. means for controlling said steam turbine as a function of said coordinated load control signals and said steam load rate control signal; d. means for providing a plurality of control modes for operating said coordinating means and said generating means at different levels of automation. - View Dependent Claims (6, 7, 8, 9, 10)
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11. In a combined cycle electric power plant having at least a gas turbine and a steam turbine and a heat recovery steam generator interconnected in a heat cycle to provide motive energy for driving said turbines, a method of controlling the load operation of said turbines comprising:
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a. controlling the temperature of the steam from said steam generator as a predetermined function of the operation of said gas turbine; b. controlling the load rate of said steam turbine as a predetermined function of throttle steam pressure; c. selecting one of a plurality of control modes and carrying out said temperature and load rate controlling steps at different selective levels of automation. - View Dependent Claims (12, 13)
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Specification