초록 ▼

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 operat

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.

대표청구항 ▼

A control apparatus for operating an extraction steam turbine-electric power generation system to satisfy extraction steam and megawatt output demand, said apparatus comprising: at least one turbine inlet steam control valve; a turbine extraction valve; a first valve controller means for positioning

A control apparatus for operating an extraction steam turbine-electric power generation system to satisfy extraction steam and megawatt output demand, said apparatus comprising: at least one turbine inlet steam control valve; a turbine extraction valve; a first valve controller means for positioning said control valve; a second valve controller means for positioning said extraction valve; a megawatt output transducer means for generating a megawatt feedback signal corresponding to the existing level of megawatt output; a sensor means for generating an extraction feedback signal corresponding to the existing level of extraction steam; a control mode selector means for determining a first operational state corresponding to the presence of said megawatt output demand and the absence of said extraction steam demand and a second operational state corresponding to the presence of both said megawatt output demand and said extraction steam demand; an operator panel means for generating at least one signal to determine the operation of said control mode selector means in accordance with an operator selection at said operator panel means; a control valve setpoint signal selection controller means for selecting a first control valve setpoint signal in said first operational state or a second control valve setpoint signal in said second operational state and establishing said selected control valve setpoint signal operative with said first valve controller means; a control valve setpoint signal controller means for determining said first control valve setpoint signal in accordance with said megawatt output demand and said megawatt feedback signal, said first control valve setpoint signal connected to said control valve setpoint signal selection controller means; an extraction valve setpoint signal controller means for determining an extraction valve setpoint signal in accordance with said extraction steam demand and said extraction feedback signal, said extraction valve setpoint signal operative with said second valve controller means; and a control valve setpoint signal correction controller means for determining said second control valve setpoint signal in accordance with a predetermined function of said megawatt feedback signal, said megawatt output demand, and said extraction valve setpoint signal, said second control valve setpoint signal connected to said control valve setpoint signal selection controller means.