Research On The Control Strategy Of Gas Turbine’s Rotatable Guide Vane Based On Auto-Disturbance Rejection Control

With the rapid development of integrated electric propulsion technology of ships,the integrated electric propulsion system with gas turbine as the core of power generation gradually becomes the development direction of ship power technology in the world.The change of load in the ship power system is uncontrollable,so solving the sudden change of gas turbine load is the most critical core technology in the whole integrated electric propulsion system.From the current application and development trend of gas turbine,the unit with fuel flow as a single control means is gradually optimized to an improved unit with combined fuel control by rotatable guide vane,and it is necessary to conduct an in-depth study on the rotatable guide vane control strategy and control method of gas turbine when the load changes abruptly.In this thesis,based on the technical parameters of a three-shaft gas turbine with rotatable guide vane driven by electric cylinder,the mathematical model of each main component of the gas turbine,such as low-pressure compressor,rotatable guide vane,high-pressure compressor,combustion chamber,rotor,volume module and load,is established by adopting a modular modeling method.In view of the nonlinear coupling relationship between fuel flow and the steerable vane during the sudden load change of the gas turbine,the gas turbine steerable vane self-turbulence control algorithm is designed,and the steerable vane control logic based on the self-turbulence control is formulated according to the control requirements,and the parameters of the self-turbulence controller are adjusted by applying the Gray Wolf intelligent optimization algorithm.Based on the Matlab/Simulink simulation platform,a control-oriented simulation model is established.With reference to the operating characteristics of an electric rotatable guide vane gas turbine,the corresponding configuration and connection are completed on a semi-physical simulation platform built with a HiGale simulation system and a localized control cabinet.Using the studied self-turbulence control strategy relying on the localized control system hardware platform,the self-turbulence controller is designed,the software development is completed,and the study is verified on the semi-physical simulation platform.The control laws of the conventional PID control algorithm and the researched transmissible lobe self-turbulence control algorithm are studied under different conditions such as sudden load changes of 2MW,4MW,6MW,8MW,as well as full load dump,continuous load ramp-up and continuous load reduction.Through semi-physical simulation,the results show that the self-rejecting control strategy has better control effect than the conventional PID control in the same situation,especially in the case of large sudden load changes,the advantage of the self-rejecting control based on the gas turbine guide vane control strategy is obvious,which can better meet the control requirements of the gas turbine under sudden load changes.The research results of this thesis can provide reference for the subsequent experimental research and real-world verification.