Combined cycle electric power plant having an improved digital/analog hybrid gas turbine control system

Patent · Tue Mar 25 04:00:00 EST 1980

OSTI ID:5748450

Kiscaden, R W; Reed, T J; Smith, J R

A digital computer system provides automatic control for a steam turbine and two gas turbines in a combined cycle electric power plant during startup and load modes of operation. The gas turbine automatic control system provides speed, load and blade path temperature control functions in developing an output fuel control signal for application to each gas turbine fuel valve control. An analog control for each gas turbine selectively provides startup and temperature and load control functions as a backup for the automatic gas turbine control, and further provides gas turbine overspeed, surge and other limit controls continuously. An operator panel functions with the analog and digital controls to provide an operator interface with the plant, and an interface circuit ties the digital and analog controls together for bumpless transfer between manual and automatic modes of operation. A sequencer is provided for each gas turbine and it provides gas turbine startup sequence control, gas turbine trip protection and other functions in both the automatic and the backup modes of operation. A gas turbine monitor develops temperature and vibration signals for the sequencer and the fuel controls.

• Assignee: Westinghouse Electric Corp
• Patent Number(s): US 4195231
• OSTI ID: 5748450
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200102* -- Fossil-Fueled Power Plants-- Power Cycles
200104 -- Fossil-Fueled Power Plants-- Components
ANALOG SYSTEMS
COMBINED-CYCLE POWER PLANTS
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL SYSTEMS
DIGITAL COMPUTERS
GAS TURBINES
LOAD MANAGEMENT
MACHINERY
MANAGEMENT
POWER PLANTS
START-UP
STEAM TURBINES
THERMAL POWER PLANTS
TURBINES
TURBOMACHINERY