Research On Integrated Drive Topology And Control Of Switched Reluctance Motor With Dual-source Input

The motor drive system is the core part of electric vehicles.Switched reluctance motor(SRM),as a representative of rare earth-free permanent magnet material motor,it has simple structure,flexible control,superior starting and speed regulation performance,alone with a high environmental adaptability.Therefore,it has become an important choice for the current type of electric vehicle drive motor,having a wide range of application prospects.The power converter topology and its control have always been an important branch of the research on the SRM system of electric vehicles.Research on compact converter topologies and optimized control strategies that have both motor drive and energy storage charging capabilities will help increase the power density of the entire drive system.It is the key to light and intelligent electric vehicles in the future.This article proposes a new type of integrated drive-charging power topology for the electric vehicle SRM drive system with dual power input.And its dual power access control method,SRM multi-mode drive optimization control strategy,brake feedback control strategy,and DC on-board charging method have been systematically studied.The specific research content is as follows:Firstly,in order to realize the dual power access control of the SRM drive system of electric vehicles,A dual-input bidirectional DC-DC converter integrated power topology based on three-switch tube cascade is studied.To analyze the effectiveness of the integrated power topology,the converter is compared with the traditional dual-source access topology that uses two sets of Buck/Boost DC-DC converters in parallel from the aspects of converter operation mode,control strategy,derivative mode and loss analysis.From the perspective of operating mode and control strategy,it can be seen that,by multiplexing the middle switch tube,the equivalence of the two topologies can be achieved,so as to realize the bidirectional power flow of each source and load.From a topologically derived perspective,it can be seen that,the integrated power converter can effectively reduce switching devices and drive resources,it is more conducive to the integration of the power system.From the perspective of loss analysis,it can be seen that,the use of sawtooth wave carrier control can reduce the loss of the integrated power converter.This article is based on the bidirectional integrated power converter,system simulation analysis is carried out on the operating modes of different power directions.A systematic experiment was carried out based on the experimental platform.Secondly,in order to realize the dual power supply drive control of the electric vehicle SRM drive system,a two-stage integrated power topology in which a two-input bidirectional DC-DC converter cascaded with three switches and a three-phase asymmetric half-bridge power converter are cascaded is proposed.This topology can realize the access of two independent power supplies by using the front-stage converter.And it can effectively control the bus voltage of the asymmetric half-bridge power converter in the subsequent stage.Since the front-end converter has the bidirectional power of each port,in this way,the dual-source multi-mode drive control,brake feedback control,and DC on-board charging control of the electric vehicle SRM can be realized.Based on the integrated power topology,this paper conducts a systematic theoretical and simulation analysis on the control strategy of the above-mentioned operating mode.And based on a set of 1k W 12/8 structure SRM experimental platform for systematic experiments.Finally,aiming at the shortcomings of traditional PI control,this paper compares traditional PI control with sliding mode variable structure control,linear active disturbance rejection control,and multi-dimensional Taylor network control.These three types of optimization control methods are systematically analyzed and compared by simulation experiments.The results show that the current regulation module and the voltage regulation module use multi-dimensional Taylor network control,and the speed control module can use multi-dimensional Taylor network control or linear active disturbance rejection control,which can effectively improve the integrated drive control effect.