Abstract: A control method and apparatus for a gas turbine generator is disclosed having multiple modes of operation dependent on generator output components including real power generated, reactive power generated, and power factor. The apparatus provides for selecting a high priority output component, a low priority output component, and a variable output component. Depending on the priority selected, stator temperature is controlled with either a var limiter controller or a MW limiter controller. Rotor temperature is controlled by limiting excitation current substantially independently of priority selection. Setpoint selection may be variable and includes desired MW, MVAR's, and Power factor. This invention allows control of the generator to produce the maximum MVAR's the generator is capable of producing while at the same time utilizing the remainder of the gas turbine output capability for MW generation.

Abstract: This invention relates to an improved apparatus and process for controlling heat input to a fractionation tower so that a proper energy balance is maintained. The apparatus and method for controlling a fractionation tower and process wherein feed and heat flow into the tower and feed is distilled and separated into distillate and bottoms, said distillate flowing from the tower through an overhead line into a condenser where it is allowed to condense before it is drawn off as product with a portion of this product being returned to the tower as reflux, and said bottoms being allowed to at least partially collect in the tower thereby establishing a liquid level which is allowed to fluctuate within predetermined limits, which method comprises generating and using the signal:Q.sub.I =Kp(K.sub.R +K.sub.D -K.sub.F)whereQ.sub.I is the heat required by the fractionation tower;Kp is the pressure controller output signal;K.sub.R is the reflux flow rate signal;K.sub.D is the distillate flow rate signal;K.sub.