This paper proposes a fractional‐order PI controller‐based direct torque control (DTC) scheme for an induction motor (IM). The IM drive is fed with multipoint clamped (MPC) inverter to realize the five‐level operation. The DTC scheme is implemented with the help of stator‐flux coordinates. The DTC scheme estimates the reference stator voltages from the reference speed and torque commands and space vector modulator synthesizes the reference stator voltages to generate the switching states of the inverter. The paper begins by featuring the theoretical concepts related to five‐level MPC inverter and compares it with conventional multilevel inverters in terms of total number of components required, conduction and switching power loss. In this paper, space vector modulation (SVM) algorithm for the generation of switching pulses to the five‐level MPC inverter based on fractal structure has been proposed with optimal switching sequence which further reduces the switching power loss, total inverter system loss, and phase‐current harmonic distortion. The design procedure and tuning of PI controllers (using fractional‐order system) for the proposed DTC‐SVM scheme are also presented. The proposed drive system allows full‐load torque control with fast response and reduced torque ripple for wide range of speed variations. The proposed DTC‐SVM fed IM drive is implemented in the MATLAB/Simulink software. The simulation results are verified with experimentation.

中文翻译：

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使用分数阶PI控制器的五级多点钳位逆变器供电感应电机驱动器的直接转矩控制方案

本文针对感应电动机（IM）提出了基于分数阶PI控制器的直接转矩控制（DTC）方案。IM驱动器配有多点钳位（MPC）逆变器，以实现五级运行。DTC方案是借助定子磁通坐标实现的。DTC方案根据参考速度和转矩命令估算参考定子电压，空间矢量调制器合成参考定子电压以生成逆变器的开关状态。本文首先介绍了与五级MPC逆变器相关的理论概念，并将其与常规多级逆变器进行比较，包括所需的组件总数，传导和开关功率损耗。在本文中，提出了一种基于分形结构的五电平MPC逆变器产生开关脉冲的空间矢量调制（SVM）算法，该算法具有最佳的开关顺序，可进一步降低开关功率损耗，逆变器系统总损耗和相电流谐波失真。还介绍了建议的DTC-SVM方案的PI控制器（使用分数阶系统）的设计过程和调整。所建议的驱动系统可实现全负载转矩控制，并具有快速响应和减少转矩波动的特性，从而可实现大范围的速度变化。建议的DTC-SVM馈送IM驱动器在MATLAB / Simulink软件中实现。仿真结果通过实验验证。逆变器系统总损耗和相电流谐波失真。还介绍了建议的DTC-SVM方案的PI控制器（使用分数阶系统）的设计过程和调整。所建议的驱动系统可实现全负载转矩控制，并具有快速响应和减少转矩波动的特性，从而可实现大范围的速度变化。建议的DTC-SVM馈送IM驱动器在MATLAB / Simulink软件中实现。仿真结果通过实验验证。逆变器系统总损耗和相电流谐波失真。还介绍了建议的DTC-SVM方案的PI控制器（使用分数阶系统）的设计过程和调整。所建议的驱动系统可实现全负载转矩控制，并具有快速响应和减少转矩波动的特性，从而可实现大范围的速度变化。建议的DTC-SVM馈送IM驱动器在MATLAB / Simulink软件中实现。仿真结果通过实验验证。建议的DTC-SVM馈送IM驱动器在MATLAB / Simulink软件中实现。仿真结果通过实验验证。建议的DTC-SVM馈送IM驱动器在MATLAB / Simulink软件中实现。仿真结果通过实验验证。