Research On Redundancy Control Technology For Suspension Joint-structure Of High-speed Maglev Train

In the thesis, the redundancy control problems for solving the failure of one electromagnet of joint-structure have been studied. The main work of the paper includes the following aspects:Firstly, the suspension system model is established. This paper describes the suspension joint-structure of high-speed maglev train and analyses its structural features. The mathematical model of suspension joint-structure accurately reflects the characteristics of the system. That is necessary for the design of suspension control algorithm.Secondly, the anti-disturbance algorithm for suspension joint-structure is studied. The failure of one suspension electromagnet will create a big impact for the adjacent electromagnet in the joint-structure. There is always a time delay between the occurrence of failure and the detection of the fault. Within this time period, the system control parameters are not able to make adjustments. To ensure the stability of the adjacent electromagnet after a failure, the anti-disturbance capability is particularly necessary.This paper analyzes the role that current feedback and position feedback play in the suspension control system. An nonlinear cascade control algorithm is proposed. Then the application of acceleration signal in anti-disturbance control is explored. An acceleration signal processing method is proposed. Furthermore, the relationship between the vehicle power grid voltage and the system anti-disturbance ability is explored. Finally, a new design method of the current loop is proposed, based on the conventional current negative feedback, dynamic current positive feedback is added to form a new control algorithm. The optimization theory is used in the designing of control parameters to improve the current response speed.Thirdly, the redundancy controller for the suspension joint-structure is designed. Based on the conventional state feedback, dynamic current positive feedback and dynamic acceleration negative feedback are added in the designing of the main controller and fault-tolerant controller. The linear quadratic optimal design method is used to design parameters. Simulation results show that in case of failure of a electromagnet, the joint-structure is able to achieve stability and has strong anti-disturbance ability.It increase the reliability of the maglev train.The paper’s conclusions have reference value for the anti-disturbance suspension control and the redundancy control for maglev train. The conclusions should be further validated by engineering tests.