Vector Control of Induction Motor Operating at High Efficiency for Electric Vehicle Drives with Electric Double Layer Capacitor

在本研究中，我们的工作目的之一是提出一种考虑铁芯损耗的高效率高响应异步电动机无速度感矢量控制方法，并讨论了该系统在电动汽车驱动中的性能。提出的矢量控制系统由考虑铁心损耗的速度自适应转子磁链观测器和补偿铁心损耗影响的直接磁场定向控制方案组成。仿真和实验结果表明，该系统在转子磁链发生变化的情况下也能估计出电机转速。本研究的下一个结果是提出了一种利用估计参数的平均值和差值进行磁场定向控制的方法，以提高由3腿单逆变器馈电的并联多感应电机驱动系统的稳定性。利用自适应转子磁链观测器估计每台电机的参数和变量（定子电流、转子磁链和转速），实现无传感器控制。通过仿真和实验验证了该方法的有效性。实验结果表明，该方法在各异步电动机额定功率不同的情况下是有效的。此外，本研究还提出了一种独立的两并联矢量控制方法。感应电动机的使用。提出了一种新的五脚单逆变器PWM方法。为了实现双支路的独立控制，作者采用了一种特殊的PWM策略，可以减少每支路不必要的开关。仿真结果表明，该方法在各种驾驶工况下都是有效的。

In this research, one of the purpose of our work is to present a speed-sensoeless vector control method for an induction motor operating at high efficiency and high response, in which core loss is taken into account, and discusses the system's performance for electric vehicle drives. The proposed vector control system consists of a speed-adaptive rotor-flux observer which takes core loss into account and employs a direct-field-oriented control scheme which compensates for the influence of core loss. On the basis of simulation and experimental results, the author shows that the proposed system can estimate motor speed even when the rotor flux is changed.The next results of this research is to propose that a method of improving the stability of parallel-connected multiple-induction motor drive system fed by a 3-leg single inverter has been devised that employs the averages and differences of estimated parameters for field-oriented control. The parameters and variables of each motor (stator current, rotor flux, and speed) are estimated using adaptive rotor flux observers to achieve sensorless control. The validity and effective of the proposed method have been demonstrated through simulations and experiments. The experimental results show that the proposed method is useful under the condition that the ratings of each induction motor are different.In addition, this research presents an independent vector control method of parallel-connected two. induction motors by using. a new PWM method of a 5-leg single inverter. In order to achieve independent control of both induction motors using the leg connected in common, the author adopted a particular PWM strategy which can reduce unnecessary switching in each leg. Simulation results show that the proposed method is effective under various driving conditions.