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A Novel Direct Torque Control Scheme for a Sensorless Five-Phase Induction Motor Drive

机译：一种无传感器五相感应电动机驱动器的新型直接转矩控制方案

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摘要

Direct torque control is a variable-structure control strategy with simplicity, fast response, and tolerance to motor parameter variation, which provides direct control of stator flux and electromagnetic torque by optimally selecting the inverter states in each sampling period. For five-phase drives, the increased number of voltage vectors offers greater flexibility in optimizing the selection of the inverter states, thereby accomplishing more precise control of the stator flux and torque. Nevertheless, the large number of inverter states means that a more elaborate and complex selection criterion is needed. The following two aspects, which are not issues for three-phase drives, are taken into account in designing switching-table-based direct torque control for five-phase drives. First, the low-frequency harmonic currents due to the auxiliary vector plane need to be eliminated. Second, full utilization of the dc-link voltage is desired. A novel switching-table-based direct torque controller fulfilling these objectives is proposed and is combined with a speed-adaptive variable-structure observer. Experimental results substantiate the effectiveness of the proposed sensorless direct torque controller.
机译：直接转矩控制是一种具有简单，快速响应和对电机参数变化具有容忍性的可变结构控制策略，它通过在每个采​​样周期内最佳选择逆变器状态来提供对定子磁通和电磁转矩的直接控制。对于五相驱动器，电压矢量数量的增加为优化逆变器状态的选择提供了更大的灵活性，从而实现了对定子磁通和转矩的更精确控制。然而，大量的逆变器状态意味着需要更精细和复杂的选择标准。在设计用于五相驱动器的基于切换表的直接转矩控制时，要考虑以下两个方面，这对于三相驱动器来说不是问题。首先，需要消除由于辅助矢量平面引起的低频谐波电流。其次，需要充分利用直流母线电压。提出了一种新颖的基于开关量表的直接转矩控制器，该控制器可以实现这些目标，并与速度自适应的可变结构观测器相结合。实验结果证实了所提出的无传感器直接转矩控制器的有效性。

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