This study proposes a novel sliding mode control (SMC) structure for a three-level voltage source inverter (VSI). The proposed controller is implemented in discrete time and is applied for the closed-loop speed control of permanent magnet synchronous motor (PMSM) drive powered from a three-level cascaded H-bridge VSI. The proposed discrete time SMC (DTSMC) has the distinct advantages of control over maximum switching frequency and relatively lower total harmonic distortion compared to that of a conventional hysteresis modulation (HM) control. Unlike HM, the proposed DTSMC relates the maximum switching frequency to sampling time, resulting in better utilisation of the bandwidth of the VSI. Additionally, a procedure to combine the DTSMC with a sliding mode observer to achieve sensor-less operation of the PMSM drive is presented. Verification of the proposed DTSMC is conducted using simulation and experimental tests. The simulation and experimental results are presented.

中文翻译：

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三级VSI馈电PMSM驱动器的无传感器DT-SMC

这项研究为三电平电压源逆变器（VSI）提出了一种新颖的滑模控制（SMC）结构。所提出的控制器在离散时间内实现，并应用于由三级级联H桥VSI供电的永磁同步电动机（PMSM）驱动器的闭环速度控制。与传统的磁滞调制（HM）控制相比，拟议的离散时间SMC（DTSMC）具有控制最大开关频率和相对较低的总谐波失真的明显优势。与HM不同，建议的DTSMC将最大开关频率与采样时间相关联，从而更好地利用了VSI的带宽。此外，提出了将DTSMC与滑模观察器组合以实现PMSM驱动器的无传感器操作的过程。使用仿真和实验测试对提议的DTSMC进行验证。给出了仿真和实验结果。