SYSTEM AND METHOD FOR SCHEDULING STARTUP OF A COMBINED CYCLE POWER GENERATION SYSTEM
First Claim
1. A method for forecasting a start period for a combined cycle power generation system including a gas turbine engine, a steam turbine and a computer control system including a user input and an output device, the method comprising:
- inputting a desired time at which the combined cycle power generation system is to reach a dispatchable load;
acquiring a current value of a predetermined operational condition of the combined cycle power generation system;
the computer control system executing an algorithm which generates a forecasted start time based on the desired time and the current value, wherein the combined cycle power generation system is predicted to be at the dispatchable load at the desired time when started at the forecasted start time, andthe computer system outputting the forecasted start time to the output device.
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Abstract
A method for forecasting a start period for a combined cycle power generation system including a gas turbine engine, a steam turbine and a computer control system, the method including: inputting a desired time at which the power generation system is to reach a dispatchable load; inputting a current value of a predetermined operational condition of the power generation system; the computer control system retrieving historical data relating the predetermined operational condition to prior start periods of the power generation system or a similar power generation system; the computer control system executing an algorithm which generates a forecasted start time based on the desired time, current value and the retrieve data, wherein the power generation system is predicted to reach the dispatchable load at the desired time when started at the forecasted start time, and the computer system outputting the forecasted start time to the output device.
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Citations
30 Claims
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1. A method for forecasting a start period for a combined cycle power generation system including a gas turbine engine, a steam turbine and a computer control system including a user input and an output device, the method comprising:
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inputting a desired time at which the combined cycle power generation system is to reach a dispatchable load; acquiring a current value of a predetermined operational condition of the combined cycle power generation system; the computer control system executing an algorithm which generates a forecasted start time based on the desired time and the current value, wherein the combined cycle power generation system is predicted to be at the dispatchable load at the desired time when started at the forecasted start time, and the computer system outputting the forecasted start time to the output device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer control system for generating a forecasted start period for a combined cycle power generation system having a gas turbine engine and a steam turbine, the computer control system comprising:
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a user input to receive a desired time at which the combined cycle power generation system is to reach a dispatchable load, and a current value of a predetermined operational condition of the combined cycle power generation system; an output device to output a forecasted start time, wherein the combined cycle power generation system is predicted to reach the dispatchable load at the desired time when started at the forecasted start time, a processor; electronic memory having stored thereon; data indicating the desired time, the current value; a database having historical information relating the predetermined operational condition to start periods of the combined cycle power generation system or a similar combined cycle power generation system, and an algorithm to generate the forecasted start time based on the desired time, current value, and data retrieved from the database or generated by an mathematical model of at least a portion of the combined cycle power generation system. - View Dependent Claims (8, 9, 10)
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11. A method for forecasting a start period for a combined cycle power generation system including a gas turbine engine, a steam turbine and a control system including having a user input and a display, the method comprising:
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a. determining a current turbine temperature of the steam turbine at a current time; b. determining a target time period to dispatchable load as a period from the current time to a target time at which the power generation system is to be at a predefined power output level; c. selecting a forecasted start time period as a period from the current time to a start time for a startup sequences of the power generation system; d. based on the forecasted start time period and the current turbine temperature, determining an estimated turbine starting temperature at the forecasted start time; e. using the estimated turbine starting temperature, determining an estimated time period for the startup sequence; f. summing the forecasted start time period and the estimate time period for the startup sequence to calculate a total time period; g. comparing the total time period to a target time period from the first time to the target time; h. using the forecasted start time period to determine when to start the startup sequence, if the comparison in step (g) determines the total time period to be within a predetermined period of the target time period, and i. decrementing the forecasted start time, if the comparison in step (g) indicates that the total time period is outside of the predetermined period of the target time period, and thereafter repeating steps (d) to (h). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for forecasting a start time for a combined cycle power generation system including a gas turbine engine (GT), at least one steam turbine (ST) and a controller having a user input and a display, the method comprising:
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a. entering into the control system a temperature of at least one of the steam turbines, wherein the temperature corresponds to a recent time; b. determining by the control system a target time period as a period from the recent time to a target time at which the power generation system is scheduled to be at a dispatchable load; c. selecting by the control system a forecasted start time period as a period from the recent time to a start of a startup sequence for the power generation system; d. based on the forecasted start time period and the first temperature, determining by the controller an estimated turbine temperature to occur at the forecasted start time; e. based on the estimated turbine temperature, determining by the controller an estimated time period for the startup sequence; f. summing by the controller the forecasted start time period and the estimated time period for the startup sequence and generating an estimated total time from the recent time to the end of the startup sequence; g. comparing by the controller the estimate total time and the target time period; h. the controller outputting the forecasted start time, if the controller in making the comparison determines the estimated total time period is within a predetermined period of the target time period, and i. decrementing by the controller the forecasted start time, if the controller determines that the estimated total time period is outside of the predetermined period of the target time period, and repeating steps d to h. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A control system for a combined cycle power generation system comprising a gas turbine and a steam turbine, the control system including a processor and an electronic memory storing a database of prior startup processes and a computer program for scheduling a start time for a future startup process, the program causing the processor to perform process steps comprising:
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a. entering as an input to the control system a current temperature of the steam turbine; b. determining by the control system a time period to dispatchable load period as a period from a current time to a target time at which the power generation system is scheduled to be at a dispatchable load; c. selecting a forecasted start time period as a period from a current time to a start of a startup process for the power generation system; d. based on the forecasted start time period and the current temperature of the at least one of the steam turbines, determining an estimated rotor temperature at the forecasted start time; e. based on the estimated rotor temperature, determining an estimated time period for a startup process which is a period initiated at the forecasted start time and ending when the power generation system reaches a predefined dispatchable load; f. summing the forecasted start time period and the estimated time period for the startup process to generate a total time to dispatchable load; g. comparing the total time to the dispatchable load to a time period from the current time to the target time; h. based on the forecasted start time period, determining when to start the startup process, if the controller in making the comparison determines the total time to dispatchable load to be within a predetermined period of the current time to the target time, and i. decrementing the forecasted start time by a predetermined period, if the controller determines in the comparison that the total time to dispatchable load is outside of the predetermined period of the current time to the target time, and repeating steps d to h. - View Dependent Claims (27, 28, 29, 30)
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Specification