Abstract: A transient control system for a gas turbine controller that cooperates with a droop speed governor to generate fuel commands regulating fuel flow to combustors of the gas turbine. The transient control system provides compensation for variations in the power output of a gas turbine while the turbine is in transient phase operation. A proportional plus integral controller in the transient control system establishes a power output set point at the initiation of a transfer phase and compares the set point to the current power output of the gas turbine. An output signal indicative of the current power output and its set point generated by the proportional plus integral controller is applied to the droop governor to compensate for variations in the power output of the gas turbine during the transient phase.

Abstract: A trip oil system automatically controls the fuel shut-off valves in an industrial gas turbine. The trip oil system applies hydraulic pressure to actuate and hold open a fuel shut-off valve so that fuel flows to the combustor of the gas turbine. When the trip oil system relieves the hydraulic pressure, the fuel shut-off valve closes and stops the fuel flow to the combustor. A bank of three solenoid valves controls the application of hydraulic pressure to each fuel shut-off valve. Hydraulic fluid conduits interconnect the three solenoid valves such that no single valve by itself can relieve the hydraulic pressure applied to the fuel shut-off valve. During normal operation of the gas turbine, all three redundant solenoid valves are activated. For the trip oil system to cause the fuel shut-off valve to close, at least two of the solenoid valves must de-energize to relieve pressure to the fuel shut-off valve.