System for operating a steam turbine with bumpless digital megaw

Details System for operating a steam turbine with bumpless digital megaw System for operating a steam turbine with bumpless digital megaw

1973-10-16

1977-06-14

Wise, Edward J.

Registers

Transfer mechanism

Traveling pawl

415 15, 60645, 444 1, F01D 1702, G05B 1500

Patent

active

040292550

ABSTRACT:
A steam turbine is provided with inlet throttle and governor valves which are positioned by an electrohydraulic control. A digital computer includes a speed control and a load control which respond to turbine speed and load signals and an electrical load signal to generate position control setpoints for the valves. A load reference is generated from an input load demand, and the reference is modified by a speed correction and selectively acted upon by a megawatt control and an impulse pressure control in the generation of the valve position setpoints. On the insertion of the megawatt control or the impulse pressure control into service, or on its removal from service, the computer instantly resets control parameters as required to provide for bumpless control loop switching.

REFERENCES:
patent: 3552872 (1971-01-01), Giras et al.
patent: 3555251 (1971-01-01), Shavit
patent: 3561216 (1971-02-01), Moore, Jr.
patent: 3564273 (1971-02-01), Cockrell
patent: 3588265 (1971-06-01), Berry
Application of the Prodac 50 System to Direct Digital Control, J. C. Belz, G. J. Kirk & P. S. Radcliffe, IEEE Intl. Conv. Rec. Part 3, 1965, pp. 102-122
Monitoring and Automatic Control in Steam Power Stations by Process Computer, E. Doetsch & G. Hirschberg, Siemens Review XXXV(1968), No. 12, pp. 471-476.

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