Modeling And MPC-based Speed Load Control Of Gas Turbine

Speed load control,as one of the most important control functions,runs through the whole gas turbine operating process,and is critical to ensuring its saftye,stablitye and efficiency.In this paper,in order to simplify the structur,improve the performance and disturbance rejection of the control system,and lay out a foundation for further improving the safety,reliability and economy of running the gas turbine,a component-level model and real-time model are developed and a cascade control scheme based on model predictive control is adopted to design a speed load controller for a three-shaft gas turbine,the developed models and controller are integrated and verified with both full digital simulation platform and hardware-in-loop real-time simulation platform.First,a component-level model and a real-time model of the gas turbine are developed.Based on the engine component library and simulation framework provided by T-MATS,the gas turbine component level model is established,and the piecewise linearization is based on this model.Using a state variable model scheduling method based on high and low pressure speed,a real-time model of gas turbine piecewise linearization is established.The simulation results show that the scheduling method has higher precision and greatly improves the accuracy and real-time performance of the real-time model.Secondly,the advanced control algorithm of gas turbine based model is studied.According to traditional speed load control scheme,a cascade PID-MPC control scheme is proposed,focusing on the gas turbine speed load controller and the constraint management based on model predictive control.The results show that the scheme has better dynamic performance than the traditional cascade PI scheme,and can realize multi-constrained management of gas turbine,which verifies the feasibility of the scheme.Once again,integration and verification of the gas turbine model and the speed load controller are carried out on the full digital simulation platform.The gas turbine component level model,real-time model and speed load controller based on MBD method are integrated into FWORKS of aircraft engine,gas turbine full authority control system design integrated platform,and the methods and processes of model and control algorithm packaging,integration and verification are summarized.By designing simulation tests in different situations,the gas turbine model and control law are fully verified.Finally,the real-time performance of the cascade PID-MPC control algorithm is explored and analyzed,which point out the difficulty of implementing the solution in the hardware platform.Finally,the integration and validation of gas turbine model in hardware-in-loop real-time simulation platform are carried out.From the analysis of the requirements of hardware integration and verification in the loop platform,the methods of packaging,integration,configuration and download of the model and control law in the platform are summarized.By running the simulation of the open-loop and closed-loop test cases,the validity and real-time performance of the gas turbine component level model and real-time model designed in this paper are verified.