Control Method Of General-purpose Power Converter Driving Switched Reluctance Motor For Electric Vehicle

With the growing environmental and energy crisis,electric vehicles are receiving an increasing amount of attention.Switched reluctance motors(SRM)are strong candidates for electric vehicle drive systems,owing to their simple and robust structure,low cost,and high fault tolerance ability.Switched reluctance motors are generaly drived by asymmetric half-bridge converter.But the lack of integrated module for asymmetric halfbridge converter increases the cost to build the switched reluctance motor drive system(SRMD),and limits its wide application to some extent.To solve this problem,this paper explores the possibility of using a general-purpose power converter to drive a switched reluctance motor.Finally,two types of power converters commonly used in the field of motor drive system were selected: three-phase full-bridge converters and T-type threelevel converters,and corresponding control methods suitable for switched reluctance motors were proposed.This paper presents a solution for three phase switched reluctance motor driven by three phase full-bridge converter,without adding new hardware elements.And based on vector control,the relationship between torque error and the duration of zero-voltage vector is established,and the different control strategy is proposed at low and high speed for further improving torque performance.This solution not only decreases the cost of SRMD,but also reduces the number of switches and connections between converter and SRM.To reduce the high building cost of power converters in the current research of using multi-level power converters to drive SRM,a novel 12 voltage vector control strategy for switched reluctance motors with a T-type three-level converter is proposed.Based on a causal analysis of torque ripple under the control of conventional six voltage vectors,six new voltage vectors are added for further reduction of torque ripple.An optimized control rule is adopted based on the division method of the 12 new voltage vectors.A zero-voltage vector is used to adjust the duration of the 12 voltage vectors,the time of which is varied according to the torque error.Finally,the proposed scheme and topology are verified by MATLAB/Simulink and RT-LAB.