Inventors:
James M. Bukowski - Pittsburgh PA
Gary E. Midock - Pittsburgh PA
Ronald J. Walko - Bethel Township, Allegheny County PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
H02P 904
G05B 1500
G06F 1546
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 system frequency correction is achieved in a load control mode upon separation of the turbine-generator from the utility power grid, by detecting turbine speed deviation beyond predetermined limits and correcting turbine speed to synchronous speed without the need for operator intervention.