Research On Torque Ripple Suppression Of The Switched Reluctance Motor Based On TSF

With the progress of science and power electronics technology,modern industry not only requires high reliability and high stability of system,but also demands high speed regulation and torque output energy consumption of motor control system.The promising Switched Reluctance Motor Driver has become a research hot spot for scholars of various fields.The Switched Reluctance Motor(SRM)has the advantages of simple structure,strong fault tolerance and flexible control mode.Meanwhile the SRM is adapted to high speed and harsh environment.so,it is widely used in aerospace,electric vehicles and other fields.However,it has nonlinear characteristics such as magnetic circuit saturation because of its inherent biconvex pole structure and pulsed power supply.The biggish torque ripple of SRM was produced due to its nonlinear characteristics,which severely limits its development.Therefore,the control strategy of SRM is studied in this dissertation.Firstly,the torque ripple suppression method of Switched Reluctance Motor is summarized and the indirect torque sharing function method is selected to study torque ripple suppression.A current control strategy based on pulse width modulation is proposed by analyzing the causes of torque ripple based on the traditional torque sharing function control strategy.The method adopts exponential sharing function.The pulse width modulation was introduced in hysteresis control to improve the controllable performance of phase current.on this basis,through the analysis of the linear inductance model,the current tracking control is divided into two segments and different duty cycles are given according to the current change rate characteristics of each part.With the proposed control strategy,the ripple of the phase current is reduced and the torque ripple of SRM is effectively reduced.Besides,the energy consumption of SRM is also a problem that must be considered in the design of SRD,so the proposed control strategy is optimized by hybrid genetic algorithm.The algorithm optimizes turn-on angle and turn-off angle for minimum the copper consumption and torque ripple of system.At the same time,the optimal turn-on angle and turn-off angle were applied to the proposed control strategy to further reduce the torque ripple and copper consumption.In order to verify the effectiveness and practical performance of the proposed control strategy,a simulation model of the SRM drive system is established in the MATLAB/Simulink and the result reflects the proposed control strategy can reduce the current ripple and reduce the torque ripple effectively.Finally,the semi-physical simulation platform of SRM is built,and the effectiveness and feasibility of the proposed control strategy are verified.