| China has the longest high-speed railway in the world, and its high speed railway technology has achieved great progress. Currently, the high-speed train is powered by asynchronous traction drive system. During recent years, due to the advance in permanent magnet materials and its fast torque response, permanent magnet synchronous traction drive system has become the future development trend. In this thesis, the models of permanent magnet synchronous traction drive system and asynchronous traction drive system have been built. The simulations were carried out and the results were presented.At the beginning of this thesis, the mathematical model of asynchronous motor and permanent synchronous motor was clarified; vector control and its related theories were described. Secondly, based on the theories described above, the models of CHR3 asynchronous traction drive system and permanent magnet synchronous traction drive system were built using Matlab The speed, torque, voltage, current characteristics of the two different traction systems under traction and breaking conditions were analyzed and compared. The simulation results demonstrated that both asynchronous traction drive system and the permanent magnet traction drive system could operate steadily under traction drive and constant speed conditions. Compare to asynchronous traction drive system, the permanent synchronous traction drive system has the advantages of fast torque response and small torque ripples.Then, high-speed train traction drive simulation software based on Simulink and VC++ hybrid programming were developed, using the RTW function provided by Matlab environment. The simulation window provides the user friendly input interface and shows the results dynamically. The traction drive simulation software using VC++ could run without Matlab. The results were verified by the Simulink model. The results show that the software can be run independent of Matlab environment, and also provided valid and useful information. |
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