Probabilistic control in gas turbine tuning for power output-emissions parameters, related control systems, computer program products and methods

Patent metadata

Field	Value
Publication number	US-9797315-B2
Application number	US-201514971721-A
Country	US
Kind code	B2
Filing date	Dec 16, 2015
Priority date	Dec 16, 2015
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

Various embodiments include a system having: at least one computing device configured to tune a set of gas turbines (GTs) by performing actions including: commanding each GT in the set of GTs to a base load level, based upon a measured ambient condition for each GT; commanding each GT in the set of GTs to adjust a respective power output to match a nominal power output value, and subsequently measuring an actual emissions value for each GT; adjusting an operating condition of each GT in the set of GTs based upon a difference between the respective measured actual emissions value and a nominal emissions value at the ambient condition; and setting a target operating condition for each GT to match the adjusted operating condition after the adjusting of the operating condition.

First claim

We claim:

1. A computing system comprising:
at least one computing device having at least one controller, the at least one computing device configured to tune each gas turbine in a set of a plurality of gas turbines based upon a power output parameter and an emissions parameter, wherein the at least one computing device is configured to:
command each gas turbine in the set to a respective base load level based upon a respective measured ambient condition;
command each gas turbine in the set to adjust a respective actual value of the power output parameter of each gas turbine in the set to match a nominal value of the power output parameter of the set, and subsequently measure a respective actual value of the emissions parameter for each gas turbine in the set;
perform an adjustment to a respective operating parameter of each gas turbine in the set based upon a difference between the respective actual value of the emissions parameter and a nominal value of the emissions parameter at the respective measured ambient condition for each gas turbine in the set,
wherein the adjustment to the respective operating parameter of each gas turbine in the set aligns each gas turbine in the set onto a first line in a graphical space plotting the power output parameter versus the emissions parameter, wherein the first line is orthogonal to a characteristic line in the graphical space,
wherein the characteristic line is a mean characteristic line of all of the plurality of gas turbines in the set, at the respective base load level of each gas turbine in the set, plotting the power output parameter versus the emissions parameter; and
set a target set point for each gas turbine in the set to match the adjusted respective operating parameter after the adjustment to the respective operating parameter.

2. The computing system of claim 1 , wherein the respective base load level is associated with a base load value of the power output parameter and a base load value of the emissions parameter for the respective measured ambient condition.

3. The computing system of claim 1 , wherein in response to the command of each gas turbine in the set to the respective base load level, each gas turbine in the set does not attain at least one of: the nominal value of the power output parameter of the set and the nominal value of the emissions parameter at the respective measured ambient condition.

4. The computing system of claim 1 , wherein the at least one computing device is further configured to convert the difference between the respective actual value of the emissions parameter and the nominal value of the emissions parameter at the respective measured ambient condition for each gas turbine in the set into a difference between a respective value of the power output parameter along the first line and the nominal value of the power output parameter of the set for each gas turbine in the set.

5. The computing system of claim 4 , wherein the adjustment to the respective operating parameter of each gas turbine in the set includes adjusting the operating parameter of each gas turbine in the set by a fraction of the difference between the respective value of the power output parameter along the first line and the nominal value of the power output parameter of the set, such that the power output parameter of each gas turbine in the set approaches and then reaches a respective nominal value of the power output parameter along the first line.

6. The computing system of claim 1 , wherein the commanding of each gas turbine in the set to adjust the respective actual value of the power output parameter of each gas turbine in the set to match the nominal value of the power output parameter of the set moves the emissions parameter for each gas turbine in the set closer to the nominal value of the emissions parameter at the respective measured ambient condition without matching the nominal value of the emissions parameter at the respective measured ambient condition.

7. A computer program product comprising program code embodied in at least one non-transitory computer readable medium, which when executed by at least one computing device having at least one controller, causes the at least one computing device to tune each gas turbine in a set of a plurality of gas turbines based upon a power output parameter and an emissions parameter by:
commanding each gas turbine in the set to a respective base load level, based upon a respective measured ambient condition;
commanding each gas turbine in the set to adjust a respective actual value of the power output parameter of each gas turbine in the set to match a nominal value of the power output parameter of the set, and subsequently measuring a respective actual value of the emissions parameter for each gas turbine in the set; and
adjusting a respective operating parameter of each gas turbine in the set based upon a difference between the respective actual value of the emissions parameter and a nominal value of the emissions parameter at the respective measured ambient condition for each gas turbine in the set,
wherein the adjusting of the respective operating parameter of each gas turbine in the set aligns each gas turbine in the set onto a first line in a graphical space plotting the power output parameter versus the emissions parameter,
wherein the first line is orthogonal to a characteristic line in the graphical space, wherein the characteristic line is a mean characteristic line of all of the plurality of gas turbines in the set, at the respective base load level of each gas turbine in the set, plotting the power output parameter versus the emissions parameter; and
setting a target set point for each gas turbine in the set to match the adjusted respective operating parameter after the adjusting of the respective operating parameter.

8. The computer program product of claim 7 , wherein the respective base load level is associated with a base load value of the power output parameter and a base load value of the emissions parameter for the respective measured ambient condition.

9. The computer program product of claim 7 , wherein in response to the commanding of each gas turbine in the set to the respective base load level, each gas turbine in the set does not attain at least one of: the nominal value of the power output parameter of the set and the nominal value of the emissions parameter at the respective measured ambient condition.

10. The computer program product of claim 7 , which when executed, causes the at least one computing device to convert the difference between the respective actual value of the emissions parameter and the nominal value of the emissions parameter at the respective measured ambient condition for each gas turbine in the set into a difference between a respective value of the power output parameter along the first line and the nominal value of the power output parameter of the set for each gas turbine in the set.

11. The computer program product of claim 10 , wherein the adjusting of the respective operating parameter of each gas turbine in the set includes adjusting the operating parameter of each gas turbine in the set by a fraction of the difference between the respective value of the power output parameter along the first line and the nominal value of the power output parameter of the set, such that the power output parameter of each gas turbine in the set approaches and then reaches a respective nominal value of the power output parameter along the first line.

12. The computer program product of claim 7 , wherein the commanding of each gas turbine in the set to adjust the respective actual value of the power output parameter of each gas turbine in the

Assignees

• Gen Electric

Inventors

• Jordan Jr Harold Lamar
• Davis Jr Lewis Berkley
• Day Scott Arthur
• Ewens David Spencer
• Morgan Rex Allen

Classifications

• F05D2270/13

  to control two or more engines simultaneously · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F02C9/42

  specially adapted for the control of two or more plants simultaneously · CPC title

• F05D2270/082

  with as little NOx as possible · CPC title

• F02C9/28 Primary

  Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed (F02C9/30 - F02C9/38, F02C9/44 take precedence) · CPC title