Nowadays, multiphase induction drives are used in electric vehicle applications to improve reliability and efficiency. These induction motors are controlled by using a multiphase voltage-source inverter (VSI). As the number of phases increases, the number of switching devices used in multiphase VSI also increases, which results in a reduction of the system efficiency and an increase in the cost. Among these multiphase drives, the six-phase drive is used more frequently in electric vehicular industries. A conventional six-phase VSI requires 12 switches to drive the six-phase machine. Also, conventional six-phase VSI requires more dc-link voltage than the boost six-phase VSI to drive the six-phase machine. In order to overcome the problems associated with the conventional six-phase VSI-controlled six-phase induction drives, this article proposes a nine-switch boost inverter (NSBI) for six-phase induction drive applications. The proposed NSBI has a single-input dc voltage source, and it provides six-phase ac output voltages. These six-phase output voltages are regulated by using modified nonsinusoidal pulsewidth modulation (MNSPWM) technique. The proposed NSBI with a six-phase induction motor is simulated using MATLAB/Simulink and validated using a field-programmable gate array (FPGA)-controlled hardware prototype. The verification of the proposed system during load-torque variations and winding-failure conditions is carried out.

中文翻译：

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提高适用于六相异步电动机的九开关升压逆变器的直流母线利用率

如今，多相感应驱动器用于电动汽车应用以提高可靠性和效率。这些感应电机通过使用多相电压源逆变器 (VSI) 进行控制。随着相数的增加，多相VSI中使用的开关器件数量也随之增加，导致系统效率降低，成本增加。在这些多相驱动器中，六相驱动器在电动汽车行业中使用频率更高。传统的六相 VSI 需要 12 个开关来驱动六相机器。此外，传统的六相 VSI 需要比升压六相 VSI 更高的直流链路电压来驱动六相机器。为了克服与传统六相 VSI 控制的六相感应驱动器相关的问题，本文提出了一种用于六相感应驱动应用的九开关升压逆变器 (NSBI)。建议的 NSBI 有一个单输入直流电压源，它提供六相交流输出电压。这些六相输出电压通过使用改进的非正弦脉宽调制 (MNSPWM) 技术进行调节。使用 MATLAB/Simulink 对建议的带有六相感应电机的 NSBI 进行仿真，并使用现场可编程门阵列 (FPGA) 控制的硬件原型进行验证。在负载扭矩变化和绕组故障条件下对所提出的系统进行了验证。这些六相输出电压通过使用改进的非正弦脉宽调制 (MNSPWM) 技术进行调节。使用 MATLAB/Simulink 对建议的带有六相感应电机的 NSBI 进行仿真，并使用现场可编程门阵列 (FPGA) 控制的硬件原型进行验证。在负载扭矩变化和绕组故障条件下对所提出的系统进行了验证。这些六相输出电压通过使用改进的非正弦脉宽调制 (MNSPWM) 技术进行调节。使用 MATLAB/Simulink 对建议的带有六相感应电机的 NSBI 进行仿真，并使用现场可编程门阵列 (FPGA) 控制的硬件原型进行验证。在负载扭矩变化和绕组故障条件下对所提出的系统进行了验证。