SYSTEMS AND METHODS FOR OPTIMAL SPEED PROTECTION FOR POWER TURBINE GOVERNING

A control system (50) for limiting power turbine torque (QPT) of a gas turbine engine (10) includes a controller (40) including a processor and memory configured to control the gas turbine engine (10), the controller (40) including an engine control module (54) that provides an effector command signal to a gas generator of the gas turbine engine (10); a power turbine governor module (60) that outputs a preliminary torque request (QPT_req_pre); and a power turbine torque (QPT) optimal limiter module (58) that outputs a maximum torque topper (QPT_max) to limit a power turbine speed overshoot of the gas turbine engine (10); wherein the controller (40) outputs a minimum value between the preliminary torque request (QPT_req_pre) and the maximum torque topper (QPT_max) to the engine control module (54).