System and method for load power management in a turboshaft gas turbine engine

A turboshaft engine, comprising:

• a gas generator section;
• a power turbine section downstream of the gas generator section;
• and
• a control system in communication with the gas generator section and the power turbine section, the control system comprising:
• an outer loop control module configured to output a current power turbine torque request (Qpt_req), the outer loop control module comprising:
• a feedback control component configured to provide regulation of the power turbine;
• a feed-forward component configured to anticipate a load on the power turbine;
• and
• a hybrid control component configured to cause the feedback control component to switch to a decay dynamic if a previously determined power turbine torque request (Qpt_req) deviates more than a predetermined amount from a currently delivered torque of the power turbine;
• and
• an inner loop control module configured to receive the current power turbine torque request (Qpt_req) from the outer loop control module, to determine fuel flow and inlet guide vane schedules based at least in part on the received current power turbine torque request (Qpt_req), and to send signals to a gas generator of the gas turbine engine in order to control the gas generator according to the determined fuel flow and inlet guide vane schedules.