Robust Thrust Control of TBCC Combined Cycle Engine Based on Regional Pole Assignment

研究了某涡轮基组合动力发动机XTER在给定航迹下的全速域推力跟踪问题。基于模型扩展思想，在原有的基于系统辨识的小偏差模型上考虑了外扰和喷油惯性环节，建立了新的面向控制的LPV模型，将原推力跟踪问题转化为推力误差镇定问题。为有效抑制外界干扰并使发动机可以快速无超调跟踪目标推力，将区域极点配置引入到状态反馈鲁棒H∞控制中，设计了一种兼顾稳态特性和暂态性能的推力跟踪控制器。最后将得到的控制算法加入到非线性模型上验证其控制效果。与已有的LADRC推力跟踪控制算法相比，本文所设计的控制器跟踪速度更快，鲁棒性能更好。The full-speed range thrust tracking problem of a certain TBCC combined cycle engine XTER under a given flight path was studied. Based on the model extension idea, the external disturbance and fuel injection inertia link were considered on the original small deviation model based on system identification, and a new LPV model oriented to control was established. The original thrust tracking problem was transformed into the thrust error stabilization problem. To effectively suppress external disturbances and enable the engine to quickly and without overshoot track the target thrust, the regional pole assignment was introduced into the state feedback robust control, and a thrust tracking controller that takes into account both steady-state characteristics and transient performance was designed. Finally, the obtained control algorithm was added to the nonlinear model to verify its control effect. Compared with the existing LADRC thrust tracking control algorithm, the controller designed in this paper has a faster tracking speed and better robust performance.