A novel control method for turboshaft engine with variable rotor speed based on the Ngdot estimator through LQG/LTR and rotor predicted torque feedforward  

作　　者：Yong WANG Qian’gang ZHENG Zhigui XU Haibo ZHANG 

机构地区：[1]College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]AECC Aero Engine Control System Institute,Wuxi 214063,China

出　　处：《Chinese Journal of Aeronautics》2020年第7期1867-1876,共10页中国航空学报（英文版）

基　　金：co-supported by the National Natural Science Foundation of China,China(Nos.51576096 and 51906102);Qing Lan and 333 Project,the Fundamental Research Funds for the Central Universities,China(No.NT2019004);National Science and Technology Major Project China(No.2017-V-0004-0054);Research on the Basic Problem of Intelligent Aero-engine,China(No.2017-JCJQ-ZD-04721);China Postdoctoral Science Foundation Funded Project,China(No.2019M661835);Aeronautics Power Foundation,China(No.6141B09050385)。

摘　　要：In order to compensate for the disturbance of wide variation in rotor demanded torque on power turbine speed and realize the fast response control of turboshaft engine during variable rotor speed,a cascade PID control method based on the acceleration estimator of gas turbine speed(Ngdot)and rotor predicted torque feedforward is proposed.Firstly,a two-speed Dual Clutch Transmission(DCT)model is applied in the integrated rotor/turboshaft engine system to achieve variable rotor speed.Then,an online estimation method of Ngdot based on the Linear Quadratic Gaussian with Loop Transfer Recovery(LQG/LTR)is proposed for power turbine speed cascade control.Finally,according to the cascade PID controller based on Ngdot estimator,a rotor demanded torque predicted method based on the Min-batch Gradient Descent-Neural Network(MGD-NN)is put forward to compromise the influence of rotor torque interference.The simulation results show that compared with cascade PID controller based on Ngdot estimator and the one combined with collective pitch feedforward control,the novel control method proposed can reduce the overshoot of power turbine speed by more than 20%,which possesses faster response,superior dynamic effect and satisfactory robustness performance.The control method proposed can realize the fast response control of turboshaft engine with variable rotor speed better.

关 键 词：LQG/LTR Ngdot estimator Rotor predicted torque feedforward Turboshaft engine Variable rotor speed 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]