This article presents a progressive comparison of predictive torque control (PTC) algorithms for a five-phase induction motor fed with a two-level five-phase inverter. The extension of three-phase PTC to the five-phase motor, introduces current harmonics of the order 10n $\pm$ 3 (n = 0, 1, 2.. .), which are not responsible for torque/flux production. The inherent disadvantage of PTC is being a variable frequency algorithm, which adds complexity to the design of magnetic components. This disadvantage of PTC can be overcome by applying dwell time ($t_{s}$) to the voltage vectors obtained through a minimum torque ripple condition, which is determined based on the ripple equation. In the proposed algorithm, a set of synthetic voltage vectors are generated and used for reducing flux and torque error through cost function. The use of synthetic voltage vector simplifies the cost function and further reduces the computation time. A two-step delay compensation is adopted to improve the precision of the control algorithm further. In each control cycle, an optimal switching time is calculated to reduce the torque ripple and to maintain the constant switching frequency. In this article, a modified PTC is proposed, which targets to achieve constant switching frequency, eliminate the xy-subspace current harmonics, reduce the torque ripple, and minimize the computational burden involved in the conventional predictive torque control algorithm. The experimental study is carried out on a laboratory prototype. The results show compliance with all the experimental study with different PTC algorithms with different sampling frequencies, and the modified cost function.

中文翻译：

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具有开关频率控制的减小转矩脉动的五相异步电动机驱动的预测转矩控制算法

本文介绍了用两电平五相逆变器供电的五相感应电机的预测转矩控制 (PTC) 算法的渐进比较。将三相 PTC 扩展到五相电机，引入了 10n $\pm$ 3 (n = 0, 1, 2..) 阶的电流谐波，它们不负责扭矩/磁通的产生。PTC 的固有缺点是可变频率算法，这增加了磁性元件设计的复杂性。PTC 的这一缺点可以通过将停留时间 ($t_{s}$) 应用于通过最小转矩脉动条件获得的电压矢量来克服，该条件基于脉动方程确定。在所提出的算法中，生成一组合成电压向量并用于通过成本函数减少通量和转矩误差。合成电压矢量的使用简化了成本函数并进一步减少了计算时间。采用两步延迟补偿，进一步提高控制算法的精度。在每个控制周期中，计算最佳切换时间以减少转矩脉动并保持恒定的切换频率。在本文中，提出了一种改进的 PTC，其目标是实现恒定的开关频率，消除 xy 子空间电流谐波，减少转矩脉动，并最大限度地减少传统预测转矩控制算法中涉及的计算负担。实验研究是在实验室原型上进行的。结果显示符合所有使用不同采样频率的不同 PTC 算法和修改后的成本函数的实验研究。