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 Yong WANG;Qian'gang ZHENG;Zhigui XU;Haibo ZHANG

作者机构：College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China AECC Aero Engine Control System InstituteWuxi 214063China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2020年第33卷第7期

页      面：1867-1876页

核心收录：

学科分类：08[工学] 082502[工学-航空宇航推进理论与工程] 0802[工学-机械工程] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 

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)。 

主　　题：LQG/LTR Ngdot estimator Rotor predicted torque feedforward Turboshaft engine Variable rotor speed 

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.