The work presents a modified switching strategy in a five-level torque controller while implementing a direct torque control scheme for the induction motor (IM) drive. Apart from the presence of conventional full-voltage vectors, the inclusion of intermediate- and zero-voltage vectors brings in the modification above in a five-level torque controller. Moreover, the estimation of flux in the scheme is done by machine current model. These adjustments result in the reduction in the torque and speed ripples; and improve the flux regulation in the low-speed region, thereby obtaining superior low-speed performance. The performance of the proposed scheme is exhaustively tested in MATLAB/Simulink and further by hardware experimentation with a laboratory-type setup of 2.2 kW, two-level voltage source inverter fed IM drive.

中文翻译：

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采用改进的五级转矩控制器的直接转矩控制感应电动机驱动器，可减少转矩波动

这项工作提出了一种五级转矩控制器的改进开关策略，同时为感应电动机（IM）驱动器实现了直接转矩控制方案。除了存在常规的全电压矢量之外，中间电压矢量和零电压矢量的结合带来了上述五级转矩控制器的改进。此外，该方案中的磁通估计是通过机器电流模型完成的。这些调整导致转矩和速度波动的减少；并改善了低速区域的磁通调节，从而获得了优异的低速性能。该方案的性能已在MATLAB / Simulink中进行了详尽的测试，并通过硬件实验以实验室类型的2.2 kW，两级电压源逆变器驱动的IM驱动器进行了硬件测试。