Determining the minimum operation and shutdown time

• US 20050159920A1
• Filed: 01/13/2005
• Published: 07/21/2005
• Est. Priority Date: 01/16/2004
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens Power Transmission & Distribution Incorporated (Siemens AG)
• Inventors: Peljto, Haso
• Granted Patent: US 7,308,382 B2
• Time in Patent Office: Days
• US Class Current: 702/179
• CPC Class Codes: G06Q 10/04 Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem" market predictions or forecasting for commercial activities G06Q30/0202

Abstract

A system and method for determining minimum operation and startup for a generator are described herein. A method and system according to the invention may include assigning a binary value to one or more commitment status variables each associated with an increment of time. The method and system may also assign a binary value to a time-dependent startup status variable. The method and system may implement the following constraints. The startup status variable minus the current commitment variable plus the subsequent previous commitment status variable is greater than or equal to zero, the startup status variable plus the subsequent previous commitment status variable is less than or equal to one, and the startup status variable minus the current commitment status variable is less than or equal to zero. The method and system may also include a constraint that a sum of all commitment status variables is greater than or equal to the product of the startup status variable and a minimum time-on variable wherein the minimum time-on variable is equal to a minimum operation time for the generator.

Claims

1. A method for determining generator operation comprising:

assigning a binary value to one or more commitment status variables each associated with an increment of time;

assigning a binary value to a time-dependent startup status variable wherein the startup status variable minus the current commitment variable plus the subsequent previous commitment status variable is greater than or equal to zero, the startup status variable plus the subsequent previous commitment status variable is less than or equal to one, and the startup status variable minus the current commitment status variable is less than or equal to zero; and

determining generator operations based on assigned values.

2. The method of claim 1, wherein the sum of all commitment status variables is greater than or equal to the product of the startup status variable and a minimum time-on variable wherein the minimum time-on variable is equal to a minimum operation time for the generator.

3. The method of claim 1, further comprising:

assigning a binary value to one or more time-dependent shutdown status variables wherein the shutdown status variable plus the current commitment status variable minus the subsequent previous commitment status variable is greater than or equal to zero, the shutdown status variable minus the subsequent previous commitment status variable is less than or equal to zero, and the shutdown status variable plus the current commitment status variable is less than or equal to one.

4. The method of claim 3, wherein the sum of all commitment status variables is less than or equal to the product of one minus the shutdown status variable and a minimum time-off variable wherein the minimum time-off variable is equal to a minimum shutdown time for the generator.

5. The method of claim 3, wherein the sum of shutdown status variables subsequent to the shutdown status variable that occurs after the current time increment minus a minimum shutdown time is less than or equal to one minus the commitment status variable wherein the minimum time-off variable is equal to a minimum shutdown time for the generator.

6. The method of claim 1, wherein the one or more commitment status variables is equal to either a zero value or a one value.

7. The method of claim 1, wherein the startup status variable is continuous.

8. The method of claim 3, wherein the one or more shutdown status variables are continuous.

9. A method for determining generator operation comprising:

assigning a binary value to one or more commitment status variables each associated with an increment of time;

assigning a binary value to one or more time-dependent shutdown status variables wherein the shutdown status variable plus the current commitment status variable minus the subsequent previous commitment status variable is greater than or equal to zero, the shutdown status variable minus the subsequent previous commitment status variable is less than or equal to zero, and the shutdown status variable plus the current commitment status variable is less than or equal to one; and

determining generator operation based on assigned values.

10. The method of claim 9, wherein the sum of all commitment status variables is less than or equal to the product of one minus the shutdown status variable and a minimum time-off variable wherein the minimum time-off variable is equal to a minimum shutdown time for the generator.

11. The method of claim 9, wherein the sum of shutdown status variables subsequent to the shutdown status variable that occurs after the current time increment minus a minimum shutdown time is less than or equal to one minus the commitment status variable wherein the minimum time-off variable is equal to a minimum shutdown time for the generator.

12. The method of claim 9, wherein the one or more commitment status variables is equal to either a zero value or a one value.

13. The method of claim 9, wherein the one or more shutdown status variables are continuous.

14. A system for determining generator operation comprising:

a means for assigning a binary value to one or more commitment status variables each associated with an increment of time;

a means for assigning a binary value to a time-dependent startup status variable wherein the startup status variable minus the current commitment variable plus the subsequent previous commitment status variable is greater than or equal to zero, the startup status variable plus the subsequent previous commitment status variable is less than or equal to one, and the startup status variable minus the current commitment status variable is less than or equal to zero; and

a means for determining generator operations based on assigned values.

15. The system of claim 14, wherein the sum of all commitment status variables is greater than or equal to the product of the startup status variable and a minimum time-on variable wherein the minimum time-on variable is equal to a minimum operation time for the generator.

16. The system of claim 14, further comprising:

a means for assigning a binary value to one or more time-dependent shutdown status variables wherein the shutdown status variable plus the current commitment status variable minus the subsequent previous commitment status variable is greater than or equal to zero, the shutdown status variable minus the subsequent previous commitment status variable is less than or equal to zero, and the shutdown status variable plus the current commitment status variable is less than or equal to one.

17. The system of claim 16, wherein the sum of all commitment status variables is less than or equal to the product of one minus the shutdown status variable and a minimum time-off variable wherein the minimum time-off variable is equal to a minimum shutdown time for the generator.

18. The system of claim 16, wherein the sum of shutdown status variables subsequent to the shutdown status variable that occurs after the current time increment minus a minimum shutdown time is less than or equal to one minus the commitment status variable wherein the minimum time-off variable is equal to a minimum shutdown time for the generator.

19. The system of claim 14, wherein the startup status variable is continuous.

20. The system of claim 16, wherein the one or more shutdown status variables are continuous.