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| Traction Simulation of Metro Vehicle Based on Low-dimension Fuzzy Direct Torque Control |
| WU Pu—sheng1．WU Pu—feng2 |
| 1．Xi’an Metro Co．Ltd，Xi"an，Shanxi 710018，China；2. Xi’an University of Technology， Xi’an，Shanxi 710048，China |
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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．
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Received: 09 December 2009
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2010, Vol. 27 
