基于新型过渡控制策略的分段直接转矩控制  

Segmentation Direct Torque Control Based on New Transition Control Strategy

作　　者：向超群[1] 陈春阳[1] 成庶[1] 

机构地区：[1]中南大学交通运输工程学院,湖南长沙410075

出　　处：《铁道学报》2018年第2期52-58,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(61273158)

摘　　要：针对现有城轨车辆变流器功率大、启制动频繁、全速范围稳定运行的需求与特点,采用分段改进直接转矩控制,可以改善车辆的运行品质。在低速段采用圆形磁链轨迹控制,可以减小电机转矩脉动,根据过渡控制策略,在中高速段则切换成六边形控制,以降低变流器开关频率和损耗。通过分析现有分段直接转矩控制存在的无法平滑过渡甚至过渡失败的风险,采用综合速度、磁链位置和电压矢量多重判据,解决特殊情况下无法过渡以及平滑过渡的问题,可以降低过渡时的冲击电流。对提出的理论进行仿真验证,结果表明采用多重综合判据的分段直接转矩控制可以更好地满足异步电机全速范围稳定运行的需求。In view of the operational requirements and characteristics of the urban rail vehicle for high power,frequent starting and braking,and stable operation in a full speed range,the use of direct torque control with improved segment in urban rail vehicle converter,can greatly improve the operation quality of the vehicle.In the low speed section,the circular flux linkage was adopted to reduce the torque ripple.In the middle and high speed section,the hexagonal flux linkage was adopted to reduce the switch frequency and the loss.By analyzing the risk that there is no smooth transition or even transition failure in the existing segmentation direct torque control,this paper adopted the multiple criteria of comprehensive speed,flux position and voltage vector,to solve the problem of the transition inability and smooth transition under the special situation and to reduce the dashcurrent of transition.The simulation results show that the multiple criteria based segmentation direct torque control can better meet the requirements of the stable operation of the asynchronous motor in a full range of speeds.

关 键 词：城轨车辆变流器 直接转矩控制 平滑过渡 

分 类 号：U264[机械工程—车辆工程]