Bumpless switching of valve drive in a turbine control system

Details Bumpless switching of valve drive in a turbine control system Bumpless switching of valve drive in a turbine control system

G - Physics

05

B

341/95

G05B 9/03 (2006.01) F01D 17/24 (2006.01) G01P 3/48 (2006.01)

Patent

CA 1199709

BUMPLESS SWITCHING OF VALVE DRIVE IN A TURBINE CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE Outputs of two independent controllers are available to control a valve actuator in a turbine control system. One of these valve drive signals is applied to the valve actuator while the other is applied to a termination. When a fault is detected in the active controller, the secondary controller is reinitialized to eliminate any drift which may have occurred therein to provide a valve drive signal closely equal to a valve drive signal pre- viously provided by the active controller. Switchover is performed placing the previously inactive controller in the active condition and applying the signal from the previously active controller to the termination.

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