Turbine speed control system and method
First Claim
Patent Images
1. A system comprising:
- a turbine generator;
one or more two-position valves to provide one or more propellants to the turbine generator; and
a controller coupled to the one or more two-position valves, the controller configured todetermine an operating speed of the turbine generator,compare the operating speed to a reference speed,if the operating speed is greater than the reference speed then the one or more two-position valves are fully closed to reduce the speed of the turbine generator,if the operating speed is less than the reference speed then the one or more two-position valves are fully opened to increase the speed of the turbine generator,wherein the reference speed varies as a function of load on the turbine generator to decrease speed droop at increased loads.
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Abstract
One embodiment of the invention provides a turbine control system that adjusts the control thresholds of two-position valves, which provide propellant to the turbine, based on turbine load so as to compensate for increased turbine speed overshoot at low load and the increased turbine speed undershoot at high load. These two-position on-off modulated valves are used in a bang-bang (fully open or fully closed) regulation scheme to eliminate or minimize speed droop by using variable speed bounds implemented as a function of load.
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Citations
20 Claims
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1. A system comprising:
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a turbine generator; one or more two-position valves to provide one or more propellants to the turbine generator; and a controller coupled to the one or more two-position valves, the controller configured to determine an operating speed of the turbine generator, compare the operating speed to a reference speed, if the operating speed is greater than the reference speed then the one or more two-position valves are fully closed to reduce the speed of the turbine generator, if the operating speed is less than the reference speed then the one or more two-position valves are fully opened to increase the speed of the turbine generator, wherein the reference speed varies as a function of load on the turbine generator to decrease speed droop at increased loads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling turbine speed comprising:
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determining the operating speed of the turbine; comparing the operating speed to an upper reference speed and a lower reference speed; increasing the speed of the turbine if the operating speed is less than the lower reference speed; decreasing the speed of the turbine if the operating speed is greater that the upper reference speed; determining the load on the turbine; and adjusting the upper reference speed and lower reference speed as a function of the load on the turbine. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A turbine comprising:
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a power generator; one or more two-position valves provide a propellant to the power generator; a controller configured to determine an operating speed for the turbine, compare the operating speed to an upper reference speed and a lower reference speed, increase the speed of the turbine if the operating speed is less than the lower reference speed, decrease the speed of the turbine if the operating speed is greater that the upper reference speed, determine the load on the turbine, and adjust the upper reference speed and lower reference speed as a function of the load on the turbine to decrease speed droop at increased loads. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification