Claims
- 1. A method of transition control for a turbine generator comprising a pulse width modulated valve operating at a variable frequency, the method comprising the steps of:
determining that a transition is to be made between valve frequencies; and smoothly changing the valve frequency over a time period.
- 2. The method of claim 1 wherein the method avoids discontinuities in the fuel flow during the transition and concomitant blow-outs when the turbine generator is operating in a lean pre-mix mode.
- 3. The method of claim 2 wherein fuel flow remains constant during the transition.
- 4. The method of claim 2 wherein fuel flow alters during the transition.
- 5. The method of claim 2 wherein the method provides a forward instantaneous path between a fuel flow command and a pulse width modulation command.
- 6. The method of claim 1 wherein the changing step comprises employing switch logic and a rate limiter to generate the valve frequency output to the valve.
- 7. The method of claim 1 additionally comprising the step of determining a duty cycle by employing pulse width modulation tables comprising entries for valve frequencies and corresponding desired duty cycles.
- 8. The method of claim 7 wherein the step of determining a duty cycle additionally comprises employing interpolation transition logic for generating a single duty cycle value based on the corresponding desired duty cycles.
- 9. A method of transition control for a pulse width modulated valve operating at a variable frequency, the method comprising the steps of:
determining that a transition is to be made between valve frequencies; and smoothly changing the valve frequency over a time period.
- 10. The method of claim 9 wherein the changing step comprises employing switch logic and a rate limiter to generate the valve frequency output to the valve.
- 11. The method of claim 9 additionally comprising the step of determining a duty cycle by employing pulse width modulation tables comprising entries for valve frequencies and corresponding desired duty cycles.
- 12. The method of claim 11 wherein the step of determining a duty cycle additionally comprises employing interpolation transition logic for generating a single duty cycle value based on the corresponding desired duty cycles.
- 13. The method of claim 9 wherein flow through the valve remains constant during the transition.
- 14. The method of claim 9 wherein flow through the valve alters during the transition.
- 15. The method of claim 9 wherein the method provides a forward instantaneous path between a valve flow command and a pulse width modulation command.
- 16. Computer software for transition control for a turbine generator comprising a pulse width modulated valve operating at a variable frequency, the software comprising:
means for determining that a transition is to be made between valve frequencies; and means for smoothly changing the valve frequency over a time period.
- 17. The software of claim 16 wherein the software avoids discontinuities in the fuel flow during the transition and concomitant blow-outs when the turbine generator is operating in a lean pre-mix mode.
- 18. The software of claim 16 wherein the changing means comprises switch logic and a rate limiter to generate the valve frequency output to the valve.
- 19. The software of claim 16 additionally comprising pulse width modulation tables comprising entries for valve frequencies and corresponding desired duty cycles.
- 20. The software of claim 19 additionally comprising interpolation transition logic for generating a single duty cycle value based on the corresponding desired duty cycles.
- 21. The software of claim 16 wherein the software provides a forward instantaneous path between a fuel flow command and a pulse width modulation command.
- 22. Computer software for transition control for a pulse width modulated valve operating at a variable frequency, the software comprising:
means for determining that a transition is to be made between valve frequencies; and means for smoothly changing the valve frequency over a time period.
- 23. The software of claim 22 wherein the changing means comprises switch logic and a rate limiter to generate the valve frequency output to the valve.
- 24. The software of claim 22 additionally comprising pulse width modulation tables comprising entries for valve frequencies and corresponding desired duty cycles.
- 25. The software of claim 24 additionally comprising interpolation transition logic for generating a single duty cycle value based on the corresponding desired duty cycles.
- 26. The software of claim 22 wherein the software provides a forward instantaneous path between a valve flow command and a pulse width modulation command.
Parent Case Info
[0001] CROSS-REFERENCE TO RELATED APPLICATIONS
[0002] This application claims the benefit of the filing of U.S. Provisional Patent Application Ser. No. 60/215,803, entitled “Transition Control Logic”, filed on Jul. 5, 2000, and the specification thereof is incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60215803 |
Jul 2000 |
US |