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首页> 外文期刊>Power Electronics, IET >Five-level torque controller-based DTC method for a cascaded three-level inverter fed induction motor drive
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Five-level torque controller-based DTC method for a cascaded three-level inverter fed induction motor drive

机译：级联三电平逆变器馈电异步电动机驱动的基于五电平转矩控制器的DTC方法

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摘要

Two cascaded two-level inverters can synthesise three-level voltage space vector. For the cascaded three-level inverter controlled induction motor, this study proposes a five-level torque controller (FLTC)-based direct torque control (DTC) method especially for improving steady-state motor torque performance and retaining the high dynamic performance. The proposed FLTC method employs hysteresis controllers, uses look-up tables and ends up with variable switching frequency of the cascaded three-level inverter. Computationally, the envisaged FLTC method is quite comparable to that of the basic DTC method. The FLTC method ensures reduced switching commutations in the inverter switching devices during low speeds of operation and simultaneously achieves reduced d/d switching stresses. An inherent drawback of FLTC method at higher speeds of operation is identified, theoretically analysed and a pseudo error-based correction is also suggested in this study to overcome the drawback. The steady-state and transient motor torque performance of the induction motor with the use of the envisaged FLTC-based DTC method is thoroughly analysed, simulated using Matlab/Simulink and then experimentally validated on a laboratory prototype for starting, speed reversal and load change conditions with the use of the cascaded three-level inverter.
机译：两个级联的两级逆变器可以合成三级电压空间矢量。对于级联三电平逆变器控制的感应电动机，本研究提出了一种基于五电平转矩控制器（FLTC）的直接转矩控制（DTC）方法，特别是用于提高稳态电动机转矩性能并保持高动态性能。所提出的FLTC方法采用滞后控制器，使用查找表，最终得到级联三电平逆变器的可变开关频率。在计算上，设想的FLTC方法与基本DTC方法相当。 FLTC方法可确保在低速运行期间减少逆变器开关设备中的开关换向，并同时降低d / d开关应力。识别，理论上分析了FLTC方法在较高操作速度下的固有缺陷，并在此研究中还提出了基于伪错误的校正方法，以克服该缺陷。使用设想的基于FLTC的DTC方法，对感应电动机的稳态和瞬态电动机转矩性能进行了全面分析，使用Matlab / Simulink进行了仿真，然后在实验室原型上对启动，速度反转和负载变化条件进行了实验验证使用级联三电平逆变器。

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