涡轴发动机组合模型非线性预测控制

Combined Model Based Nonlinear Predictive Control for Turboshaft Engine

针对涡轴发动机,为了更好的满足控制系统的实时性要求和提高控制性能,建立了数值稳态非线性模型和ARX动态线性模型相串联的组合模型,并将其作为预测模型,设计了非线性预测控制器。由于优化求解控制器时避免了非线性规划问题,控制系统的实时性得以保证。仿真结果表明,当旋翼负载变化时,功率涡轮转速收敛速度快,稳态精度高,超调量小。

Aimed at turboshaft engine, in order to better satisfy the requirements of real-time control system and improve the control performance, a numerical-ARX combined model is constructed. The combined model has two parts, one is numeri- cal steady-state nonlinear model and another is ARX dynamical linear model. By employing the combined model as prediction model, the nonlinear predictive controller is designed. Since the nonlinear programming problem is avoided, the real time of engine control system is guaranteed. Simulation results illustrated that with the change of collective pitch, power turbine speed can converge fast with high precision, and the overshooting is small.