System for controlling input profiles of combined cycle power generation system

• US 8,352,148 B2
• Filed: 05/21/2008
• Issued: 01/08/2013
• Est. Priority Date: 05/21/2008
• Status: Active Grant

• Current Assignee: Gambro Lundia AB (Baxter International Inc.), GE Infrastructure Technology, LLC (GE Vernova, Inc.)
• Original Assignee: General Electric Company
• Inventors: D'Amato, Fernando Javier, Kirchhof, Darrin Glen, Baker, Dean Alexander, Chandra, Ramu Sharat, Holzhauer, Daniel Francis, Long, Christopher Eugene
• Primary Examiner(s): ARTHUR JEANGLAUDE, GERTRUDE
• Application Number:
  US12/124,316
• Publication Number:
  US 20090292436A1
• Time in Patent Office: 1,693 Days
• Field of Search: 700 28- 36, 700/40, 700/44, 700/45, 700286-288, 701/100, 701/36, 701/99, 703/18, 706/907
• US Class Current: 701/100
• CPC Class Codes: G05B 13/048 using a predictor
• CPC Class Codes: Y02E 20/16 Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Abstract

A control system for a combined cycle power generation system including a gas turbine engine (GT), a heat recovery steam generator (HRSG), and a steam turbine (ST) includes a display wherein an operator may observe information about predicted operating parameters; a user interface wherein an operator may provide additional operating constraints; and a controller configured to generate input profiles of the GT, the HRSG, and the ST that satisfy the nominal constraints and any additional constraints and to generate the information about the predicted operating parameters. The controller may be configured to detect a stage transition of power generation system operation and update the input profiles. The controller may be configured to generate alternative operating scenarios by mapping alternative control actions to an operating constraint of at least one of the system components.

Claims

1. A control system for a combined cycle power generation system comprising gas turbine engines (GTs), heat recovery steam generators (HRSGs), and at least one steam turbine (ST), the combined cycle power generation system having nominal operating constraints, the control system comprising:

a display for providing an operator information about predicted operating parameters of the power generation system;

a user interface for receiving from the operator (a) any additional operating constraints of the power generation system, and (b) any operator commands regarding a number of GTs to start, an order of starting the GTs, blending types of HRSGs to the ST, load levels for blending of the GTs, or a combination thereof;

a controller for (a) receiving input corresponding to any additional operating constraints (b) using sensors for obtaining component operating parameters of the power generation system, (c) generating input profiles of the GTs, the HRSGs, and the at least one ST that satisfy the nominal constraints and any additional constraints, (d) generating the information about the predicted operating parameters of the power generation system based on the input profiles and the component operating parameters, and (e) controlling a plurality of components required for a start-up of the combined cycle power generation system.

2. The control system of claim 1 wherein the controller is further configured, while generating the input profiles, to optimize at least one power generation system operating parameter.

3. The control system of claim 1 wherein the predicted operating parameter comprises a predicted GT load, a rotor stress values of the ST, a GT exhaust temperature, a partial start up time, a total start up time, an emissions production, fuel consumption, an expense, ambient temperature, available steam, a component temperature, a component pressure, or a combination thereof.

4. The control system of claim 1, wherein the user interface is configured so that an operator may provide commands regarding a performance requirement, and wherein the controller is configured to receive the performance requirement and use the performance requirement when generating the input profiles.

5. The control system of claim 4 wherein the performance requirement comprises an emissions production, fuel consumption, a net heat rate, a GT load, a rotor stress value of the ST, a GT exhaust temperature, a partial start up time, a total start up time, available steam, an expense, a component temperature, a component pressure, or a combination thereof.

6. The control system of claim 1 wherein the controller is configured to generate information regarding alternative scenarios and the display is configured to show the information regarding the alternative scenarios.

7. The control system of claim 1 wherein the predicted operating parameter comprises a time to reach a blending point, a time to complete a blending, a time to reach a desired load, an isotherm condition, or a combination thereof.

8. The control system of claim 1 wherein the controller is configured to detect a stage transition of power generation system operation and use information regarding the stage transition when generating the input profiles.

9. A control system for a combined cycle power generation system comprising gas turbines (GTs), heat recovery steam generators (HRSGs), and at least one steam turbine (ST), the system comprising:

a user interface for receiving any operator commands regarding a number of GTs to start, an order of starting the GTs, blending types of HRSGs to the ST, or a combination thereof;

a model for the GTs, the HRSGs, and the ST configured to represent dynamics and constraints using a plurality of parameters;

an optimizer configured to receive input corresponding to the parameters and to generate input profiles of the GTs, the HRSGs and the ST that satisfy the constraints and optimize at least one power generation system operating parameter,

wherein the optimizer is further configured to detect a stage transition of the power generation system operation based on information from sensors and to use the detected stage transition to update the input profiles, and wherein the stage transition comprises connecting or disconnecting of an HRSG from the HRSGs to the ST.

10. The control system of claim 9 wherein the user interface is configured so that an operator may provide commands regarding a performance requirement, and wherein the optimizer is configured to receive the performance requirement and use the performance requirement when generating the input profiles.

11. A control system for a combined cycle power generation system comprising gas turbines (GTs), heat recovery steam generators (HRSGs), and at least one a steam turbine (ST), the control system comprising:

a controller for

(a) obtaining component parameters of the power generation system from sensors,

(b) receiving any operator commands regarding a number of GTs to start, an order of starting the GTs, blending types of HRSGs to the ST, or combinations thereof;

(c) generating input profiles of the GTs, the HRSGs, and the at least one ST utilizing the component parameters and the operator commands, and

(d) generating alternative operating scenarios by mapping alternative control actions to an operating constraint of at least one of the GTs, at least one of the HRSGs, the ST, or a combination of any of the foregoing.

12. The control system of claim 11 wherein the alternative control actions include controlling flow of steam generated in the HRSGs into the ST.

13. The control system of claim 11 wherein the alternative control actions include controlling GT loading to enable the GT to cross an isotherm condition that is a part of the input profiles generated by the controller.

14. The control system of claim 11 wherein the controller is configured to

simulate the alternative control actions,

predict effects of the multiple alternative control actions on the operating constraint;

and

discriminate which of the multiple alternative control actions would and would not violate the operating constraint.

15. The control system of claim 14 wherein the controller is further configured to rank the alternative control actions.

16. The control system of claim 14 further comprising a display configured to display the alternative operating scenarios of the power generation system and the predicted effects of the alternative control actions.

17. The control system of claim 16 wherein the controller is further configured to determine a recommended control action, a not-recommended control action, or a combination thereof and wherein the display is configured to display the recommended control action, the not-recommended control action, or the combination thereof.

18. The control system of claim 16 wherein the controller is configured to prevent any initiation of an operator command that would violate the operating constraints.