Steam turbine control with megawatt feedback

Details Steam turbine control with megawatt feedback Steam turbine control with megawatt feedback

1988-03-30

1989-08-01

Shoop, Jr., William M.

Prime-mover dynamo plants

Electric control

Engine control

290 40R, F01D 1704

Patent

active

048535524

ABSTRACT:
A signal representing the electrical output power of a steam turbine-generator is fed back to a control system. A signal representing the boiler steam pressure is also fed to the control system. A control signal for controlling valves feeding steam to the steam turbine is gain controlled between one and zero in the presence of a negative rate of change of steam pressure less than a predetermined value. At other negative and all positive values of rate of change of steam pressure, the control signal is unaffected. In one embodiment, a linear relationship is employed for controlling the gain for increasingly negative values of the rate of change of steam pressure. At an extreme negative value, the gain is controlled to zero, whereby the a load reference signal remains unchanged.

REFERENCES:
patent: 3959635 (1976-05-01), Tanco
patent: 4029951 (1977-06-01), Berry et al.
patent: 4120159 (1978-10-01), Matsumoto et al.
patent: 4179742 (1979-12-01), Stern et al.
patent: 4329592 (1982-05-01), Wagner et al.
patent: 4450363 (1984-05-01), Russell et al.
patent: 4746807 (1988-05-01), Furo et al.

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