Event-Triggered Sliding Mode Fault Tolerant Control For Gas Turbine Control Systems

Heavy-duty gas turbine is a highly nonlinear integrated complex system engineering,and its control system is the key functional system to ensure its stable performance and reliable operation.With the development of heavy-duty gas turbine technology,the complexity of the control system is increasing,and any problem in any link may lead to the faults of some functions of the system or the fault of the whole system.In order to improve the stability,safety and reliability of the control system,it is of great significance to the fault-tolerant control design of the control system.In this paper,a series of studies on the faults of actuators and sensors are carried out for a heavy-duty gas turbine.The main work is as follows:(1)The internal structure and working principle of gas turbine are introduced.Based on Rowen model,the thermodynamic cycle process is analyzed and the parameters of Rowen model are reconstructed.On this basis,taking the load control system as an example,the linearized state variable model of the gas turbine load control system is obtained by using the least square fitting method.(2)An event-triggered sliding mode fault-tolerant control method is proposed to solve the actuator fault problem of gas turbine load control system.Firstly,considering network delay,event triggering mechanism and external interference,a system model including sliding mode is established.Then,based on Lyapunov functional method,a sufficient condition for asymptotic stability of linear matrix inequalities satisfying H∞performance is proposed,and event trigger parameters and sliding mode parameters are designed to construct a feedback-based sliding mode fault-tolerant controller.Finally,the simulation results of gas turbine system are given,which verifies the effectiveness of the theoretical method.(3)A method of sensor fault estimation and sliding mode fault-tolerant control under dynamic event triggering is proposed to solve the sensor fault problem of gas turbine load control system.Firstly,the sensor fault is equivalent to the virtual internal system fault by filtering,and a dynamic event-triggered fault/state observer is designed to estimate the sensor fault and system state simultaneously.Then,considering faults,network delays and external disturbances,a discrete-time model including sliding mode and fault/state error dynamics is established.Then,based on Lyapunov functional method,a sufficient condition for asymptotic stability of linear matrix inequalities satisfying H∞ performance is proposed,and the design method of parameters is given.On this basis,a sliding mode fault-tolerant controller is designed,and the effectiveness of the theoretical method is verified by a simulation example.(4)Based on the above fault-tolerant control method,reliability evaluation index is designed,and Monte Carlo simulation method is used to analyze the reliability of fault-tolerant control methods for actuator faults and sensor faults of gas turbine control system,so as to illustrate the effectiveness of the above methods.