Turboshaft Engine Optimal Acceleration Control

In this paper, the mathematical model of certain turbo shaft engine is researched and the engine performance simulation is carried out. Based on the engine mathematical model and engine control law, the optimal control for turbo shaft engine acceleration is investigated. The optimal method used in this paper is named Sequential Quadratic Programming (SQP), which is one of the most successful methods for solving nonlinear constrained problem.In the process of optimal control, most of performance constraints and component constraints which are present in the actual engine acceleration are considered, including compressor surge margin, the limit of over-temperature, over-speed limit of gas generator and power turbine, the maximum torque limit and rich extinction in combustor, etc. Besides, the constraints such as the change rate of control variable are also considered. The optimal control method and the simulating main program are programmed by FORTRAN language based on the Power Station 4.0 software. Our program is used to study turbo shaft engine acceleration control.The results of simulation show that it's feasible to apply SQP method to turbo shaft engine acceleration control. It is proved that the optimal control law is correct, which shortens the acceleration time and improves the engine dynamic performance greatly compared with the traditional PID control results.