Combined cycle electric power plant and a gas turbine having a backup control system with an improved feedforward analog speed/load control
A combined cycle electric power plant is described that includes gas and steam turbines and steam generators and a digital/analog control system. The control system includes a digital automatic control and an analog backup control which are interfaced to control the gas turbine fuel flow for speed and load control purposes. The backup control includes a speed/load control which functions on a feedforward speed control basis without speed feedback correction and on a feedforward load control basis without load feedback correction. The forward speed/load control channel is subjected to high and low limit action and the fuel reference output is applied to a feedback type fuel control, i.e., a throttle valve positioning control. Limit action is also placed on the forward speed/load control channel by a temperature control, a surge control and an overspeed control.
- Assignee:
- Westinghouse Electric Corp.
- Patent Number(s):
- US 3965674
- OSTI ID:
- 7349992
- Country of Publication:
- United States
- Language:
- English
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