Method and apparatus for controlling the control valve setpoint mode selection for an extraction steam turbine
US4577281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1983 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Dec 16, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2200/11
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A microprocessor-based controller for an extraction type steam turbine-generator unit capable of selecting from a variety of predetermined control strategies and implementing corresponding valve position control loops by generating appropriate valve position control signals in accordance with operator-chosen setpoint signals and turbine operating level signals. In a particular control strategy, automatic compensation of megawatt output is achieved during the extraction mode of turbine operation by summing a megawatt setpoint signal from a feedback loop with a feedforward extraction valve setpoint signal and a megawatt reference signal, which sum is then applied to the turbine control valves to enable tight megawatt control during the extraction operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.