System and method for operating a steam turbine with digital com

Details System and method for operating a steam turbine with digital com System and method for operating a steam turbine with digital com

1973-10-17

1977-10-11

Wise, Edward J.

Boots, shoes, and leggings

415 15, 290 40R, 60645, 364300, H02P 904, G05B 1500, F01D 1702

Patent

active

040537463

ABSTRACT:
In a system and method for automatically starting, synchronizing and operating a steam turbine, proportional plus integral feedbck control utilizing digital computer systems is adapted to correspond to physical valve operation by applying integration limits. Useful for both speed and load control modes of operation, the demand signal is compared with prior values thereof, and the differential is both multiplied by a proportional gain factor, and integrated in the computer utilizing numerical integration techniques. The integrated total is kept within a desired range by applying upper and lower limits, and the limited integral is combined with the proportional factor, further limited, as desired, and appropriately scaled for use as a process variable.

REFERENCES:
patent: 3533236 (1970-10-01), Cottington
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
patent: 3748491 (1973-07-01), Barrigher et al.
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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