System and method for operating a steam turbine with digital computer control having integrator limit
US4053746A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1973 |
| Grant date | Oct 11, 1977 |
| Priority date | — |
| Expiry date | Oct 17, 1993 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P9/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.