Abstract：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 frequenfly 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 ate 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．
吴浦升，吴溥峰. 基于降维模糊直接转矩的地铁车辆牵引仿真[J]. 铁道工程学报, 2010, 27(7): 69-72.
WU Pu—sheng．WU Pu—feng. Traction Simulation of Metro Vehicle Based on Low-dimension Fuzzy Direct Torque Control. 铁道工程学报, 2010, 27(7): 69-72.
Lian Pengfei. Research on Setting Proposal of Regenerative Braking Energy Absorbing Equipment for Shenzhen Metro 2[J]. Journal of Railway Engineering Society, 2007(6): 85 -89.
[3 ] Takahashi, I, O hmori, Y. High -performance direct torque control of an induction motor. IEEE Trans. on Industry Applications, 1989, 25( 2): 257 -264.
[4] 李夙.异步电动机直接转矩控制[M ].北京:机械工业出 版社, 1994.
Li Su. Direct Torque Control of Asynchronous Motor [M ]. BeiJing:China Machine Press, 1994.
Yan Qing, Deng Zhonghua. Torque Observer Question for Low Speed Performance of DTC System [ J ]. Transactions of China Electrotechnical Society, 1996 (3): 21 -26.
[6] Takahashi, I, O hmori, Y. High -performance Direct Torque Control of an Induction Motor. IEEE Trans. on Industry Applications, 1989, 25(2): 257 -264.
Liu Guohai, Dai Xianzhong. Neural Network Control of DTC System [ J ]. Transactions of China Electrotechnical Society, 2001(6): 13 -17
[8] Cabrera L A. eta.l Learning techniques to train neural networks as a state selector for invert-fed induction machines using direct torque control. IEEE Trans. on Power Electronics, 1997, 12(5): 788 -799
Song Changlin, Li Zhi. Research of AC-DC -AC Electric Loco motive Speed Control [ J ]. Electric Machines and Control, 2002(2): 105 -107.
[10]Nik Rumzi Nik Idris. Direct torque control of induction Machines with constant switching frequency and reduced torque ripple. IEEE Transactions on Industrial Electronics, 2004(4): 758 -767.
2010, Vol. 27 
版权所有 © 2014 《铁道工程学报》编辑部