Abstract：A direct torque control (DTC) scheme of traction induction motor based on PI controller and space vector pulse width modulation (SVPWM) in 60° coordinate frame is adopted for traction system supplied by three-level diode neutral point clamped(NPC) inverter in high speed electrical multiple units (EMU). Firstly, in order to obtain a perfect torque performance, a modified U-I integration stator flux observer is presented, and the torque and stator flux control schemes based on PI controller are shown. Secondly, SVPWM in 60° coordinate frame is designed in detail, which can reduce calculation times effectively compared with traditional SVPWM. On basis of this, to balance the DC-link capacitors’ voltages, duty ratio times of redundancy small vectors are allocated by regulating neutral point control factor. Finally, validity and feasibility of the three-level direct torque control scheme based on PI controller and SVPWM in 60° coordinate frame are verified by Matlab/Simulink software simulation and Hardware-in-loop experiment of traction experimental prototype for high speed EMU based on TMS320F2812 and dSPACE.
宋文胜, 冯晓云, 侯黎明, 葛兴来. 电力牵引传动系统的三电平直接转矩控制算法的半实物实验研究[J]. 电工技术学报, 2012, 27(2): 165-172.
Song Wensheng, Feng Xiaoyun, Hou Liming, Ge Xinglai. Hardware-in-Loop Research of Three-Level Direct Torque Control Scheme for Electric Traction Drive System. Transactions of China Electrotechnical Society, 2012, 27(2): 165-172.
[1] 张曙光. CRH2型动车组[M]. 北京: 中国铁道出版社, 2008. [2] 张曙光. CRH5型动车组[M]. 北京: 中国铁道出版社, 2008. [3] 冯晓云. 电力牵引交流传动及其控制系统[M]. 北京: 高等教育出版社, 2009. [4] Depenbrock M. Direct self-control(DSC) of inverter fed induction machine[J]. IEEE Transactions on Power Electronics, 1988, 3(5): 420-429. [5] Takahashi I, Noguchi T. A new quick-response and high efficency control strategy of an induction motor[J]. IEEE Transactions on Industry Applications, 1986, 22(5): 820-827. [6] Buja G, Kazmierkowski M. Direct torque control of PWM inverter-fed AC motors—a survey[J]. IEEE Transactions on Industry Applications, 2004, 51(4): 744-757. [7] Hableter T, Profumo F, Pastorelli M, et al. Direct toque control of induction machines using space vector modulation[J]. IEEE Transactions on Industry Applications, 1992, 28(5): 1045-1053. [8] Lascu C, Boldea I, Blaabjerg F. A modified direct torque control for induction motor sensorless drive[J]. IEEE Transactions on Industry Applications, 2000, 36(1): 122-130. [9] Lai Y, Chen J. A new approach to direct torque control of induction motor drives for constant inverter switching frequency and torque ripple reduction[J]. IEEE Transactions on Energy Conversion, 2001, 16(3): 220-227. [10] 林磊, 邹云屏, 王展, 等. 一种具有中点平衡功能的三电平异步电机直接转矩控制方法[J]. 中国电机工程学报, 2007, 27(3): 46-50. [11] 李永东, 侯轩, 谭卓辉. 三电平逆变器异步电动机直接转矩控制系统(I)——单一矢量法[J]. 电工技术学报, 2004, 19(4): 34-39. [12] 李永东, 侯轩, 谭卓辉. 三电平逆变器异步电动机直接转矩控制系统(II)——合成矢量法[J]. 电工技术学报, 2004, 19(5): 31-35. [13] 刘述喜, 王明渝. 基于快速空间矢量调制算法的三电平直接转矩预测控制系统[J]. 电工技术学报, 2009, 24(2): 35-41. [14] 宋文祥, 陈国呈, 丁肖宇, 等. 基于两类脉宽调制方式本质联系的三电平逆变器中点电压平衡控制的研究[J]. 电工技术学报, 2005, 20(12): 53-58. [15] 宋文祥, 陈国呈, 陈陈. 基于矢量合成的三电平空间电压矢量调制方法[J]. 电工技术学报, 2007, 22(10): 91-96. [16] Celanovic N, Boroyevich D. A fast space-vector modulation algorithm for multilevel three-phase converters[J]. IEEE Transations on Industry Applications, 2001, 37(2): 637-641. [17] 赵辉, 李瑞, 王红君, 等. 60°坐标系下三电平逆变器SVPWM方法的研究[J]. 中国电机工程学报, 2008, 28(24): 29-45. [18] Hu J, Wu B. New Integration Algorithms for estimating motor flux over a wide speed range[J]. IEEE Transactions on Power Electronics, 1998, 13(5): 969-977.
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