Modeling And Simulation Study Of 400kW Twin-Shaft Micro Gas Turbine

With the continuous promotion of energy transformation,distributed energy will also enter a period of rapid development in the context of carbon neutrality and carbon peaking.As the core device in distributed energy technology,micro gas turbine is a reflection of the comprehensive level of a large number of engineering fields,and also represents the strength of the national equipment manufacturing industry.The performance of micro gas turbine is decisive for the operational safety and reliability of the whole system.In addition,micro gas turbines do not have large rotational inertia and most of them have significant thermal inertia of heat return devices,which require high precision and matching control systems,and control system design optimization needs to be studied through dynamic simulation of micro gas turbines.Therefore,the dynamic simulation and analysis research of advanced micro gas turbine can help promote the independent research and development of domestic micro gas turbine,and is of great significance to the localization of micro gas turbineIn this paper,the successful simulation experience of single-shaft miniature gas turbine is referred to,and the simulation modeling of the two-shaft miniature gas turbine with and without heaters is carried out based on Matlab/Simulink visualization simulation platform.Firstly,the thermodynamic dynamic equations of each key component of the biaxial micro gas turbine are simplified and analyzed,and then each component of the biaxial micro gas turbine is modeled according to the simplified thermodynamic dynamic equations and the modular modeling idea.Based on the dynamic simulation models of the two-shaft miniature gas turbine in the heat recovery cycle and the simple cycle,cold start,step-up load,step-down load and load shedding operation are simulated for both of them.The simulation results show that the two-shaft miniature gas turbine model can simulate the variable load process of the two-shaft miniature gas turbine,and the speed controller model can control the speed and other key performance parameters within a safe and reasonable range,so that the model can operate safely and stably,which provides a dynamic model basis for the modeling and simulation study of the two-shaft miniature gas turbine;the response time of the two-shaft miniature gas turbine performance parameters under the variable load condition is affected by The response time of the performance parameters of the twin-shaft miniature gas turbine under variable load conditions is affected by the magnitude of load disturbance and the thermal inertia of the return heaters;in particular,the rotor rotational inertia,return heaters thermal inertia and the influence of rotor rotational inertia,return heaters thermal inertia and gas path thermal inertia on the return heat cycle of the twin-shaft miniature gas turbine are analyzed in the process of load reduction.Based on the dynamic models of single-shaft micro gas turbine and two-shaft micro gas turbine,the response process of the micro gas turbine’s exhaust temperature,efficiency and other important parameters with temperature change is studied by applying the perturbation of external ambient temperature change to both of them under rated operating conditions,and the performance difference between the two-shaft micro gas turbine and the single-shaft micro gas turbine is analyzed.The simulation results show that the temperature change can affect the dynamic performance of the micro gas turbine;the two-axis micro gas turbine is more stable than the single-axis micro gas turbine when subjected to temperature perturbation.