摘要
研究目的:直接转矩控制以其优良的动静态性能成功地应用在电力机车牵引的大功率交流传动上,然而该控制方法在低速时的转矩脉动比较严重,使得低速的控制性能大大降低。目前地铁车辆多采用交流传动方式,站间距离小,启制动频繁,停车精度高就要求车辆具有良好的加速、减速及低速性能。直接转矩控制快速的转矩响应特性非常适合于地铁车辆的运行,减小低速时的转矩脉动问题是目前需要解决的一个主要问题。研究结论:通过研究提出了一种降维模糊直接转矩控制系统,以转矩和磁链为输入构成二维模糊控制器,将控制作用看作模糊量作为输出,经过矢量选择表后在每个控制周期为逆变器施加合适的电压矢量。仿真结果表明转矩脉动大大减小。
Research purposes：The direct torque control method has been successfully used for big power A.C driving of electric locomotive due to its high static and dynamic performances,but with this control method,the torque ripple under low frequency is rather big,which decreases the low speed control performance.Now the most metro vehicles use A.C driving.As the distance between metro stations is short and the metro vehicle starts and stops very frequently with high accuracy of stopping,the metro vehicle is required for the very good performances of acceleration,deceleration and low speed.The direct torque control has high torque response,so it is very suitable for metro vehicle,but the problem of decreasing the torque ripple at low speed needs to be resolved.Research conclusions：Through the study,a noble direct torque control system based on low-dimension fuzzy control theory is proposed to decrease the torque ripple.In this system,the torque and magnetism are used as two inputs to form the fuzzy control and the control functions are used as fuzzy output.The output of fuzzy controller is used as the input of vector table and the suitable voltage in each control period can be determined.The simulation results show that the torque ripple is decreased dramatically.
出处
《铁道工程学报》
EI
北大核心
2010年第7期69-72,82,共5页
Journal of Railway Engineering Society
关键词
直接转矩控制
转矩脉动
模糊控制
电压矢量
direct torque control
torque ripple
fuzzy control
voltage vector
