Torque Ripple Suppression And Fault Tolerant Control Of The Switched Reluctance Motor For Vehicle

With the increasingly serious global environmental problems and the continuous improvement of human environmental protection awareness,the realization of the "dual carbon" goal is imminent.Hybrid electrical vehicles(HEV)have attracted widespread attention due to their advantages of long battery life and low emissions.The switched reluctance motor(SRM)is very suitable as a motor for HEV due to its advantages of no permanent magnet,high efficiency,and large starting torque.At present,HEV pays more attention to comfort and reliability,so it puts forward high requirements on the torque ripple and fault tolerance performance of its drive motor.Supported by the national natural science foundation of china(51875261),and the jiangsu provincial outstanding youth fund(BK20180046),the thesis conducts research on the mathematical model of SRM,the principle of speed control,torque ripple suppression,fault-tolerant control and experimental verification.The specific research content is as follows:1.The mathematical equation of SRM is derived,the establishment methods of three mathematical models of SRM are expounded,and the basic speed control method and driving principle of SRM are introduced.The foundation for the subsequent research on torque ripple suppression control and fault-tolerant control is laid.2.The basic principle of sliding mode control is introduced,the switching function and control function equation of sliding mode control is deduced,and the influence of approach rate on the motion characteristics of sliding mode is analyzed.Aiming at the problem of insufficient torque tracking of torque sharing function(TSF)control at medium and high speeds,a TSF control scheme based on sliding mode control is proposed to improve the torque ripple suppression ability of TSF control,and the simulation verifies the scheme Effectiveness of suppression of SRM torque ripple.3.Aiming at the shortcoming of low reliability of SRM asymmetrical half-bridge power converter,a fault-tolerant control scheme of SRM based on bus current is proposed.Analyze the bus current state when the power converter is faulty,construct an open-circuit and short-circuit fault detection scheme,a phase current reconstruction scheme based on bus current and a position estimation method based on inductance,and verify the fault tolerance of the fault-tolerant control scheme through simulation.4.Based on self-designed drive hardware and d SPACE components,an SRM rapid control prototype experiment platform was built.The software level is realized with the help of simulink for building control models and targetlink for automatically generating C code;the hardware level is realized through self-designed drive hardware such as position signal acquisition circuits,electrical signal acquisition circuits and power converter drive circuits.The experimental platform verifies the proposed torque ripple suppression control and fault-tolerant control,and verifies the effectiveness of the proposed theory.