Combined cycle electric power plant having an improved...

Details Combined cycle electric power plant having an improved... Combined cycle electric power plant having an improved...

F - Mech Eng,Light,Heat,Weapons

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341/18, 322/6.6

F01K 23/00 (2006.01) F01K 23/10 (2006.01) F02C 9/28 (2006.01)

Patent

CA 1070386

COMBINED CYCLE ELECTRIC POWER PLANT HAVING AN IMPROVED DIGITAL/ANALOG HYBRID GAS TURBINE CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE 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 opera- tion. The gas turbine automatic control system provides speed, load and blade path temperature control functions in develop- ing an output fuel control signal for application to each gas turbine fuel valve control. An analog control for each gas turbine selectively provided startup and temperature and load control functions as a backup for the automatic gas tur- bine control, and further provides gas turbine overspeed, surge and other limit controls continuously. An operator panel functions with the analog and digital controls to pro- vide 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 oper- ation. 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.

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