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首页> 外文期刊>IEEE Transactions on Industrial Electronics >An Improved Model Predictive Direct Torque Control Strategy for Reducing Harmonic Currents and Torque Ripples of Five-Phase Permanent Magnet Synchronous Motors
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An Improved Model Predictive Direct Torque Control Strategy for Reducing Harmonic Currents and Torque Ripples of Five-Phase Permanent Magnet Synchronous Motors

机译：一种改进的模型预测直接扭矩控制策略，用于减少五相永磁同步电动机的谐波电流和扭矩涟漪

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摘要

Five-phase permanent magnet synchronous motors offer merits of high fault tolerant capability and high torque per rms ampere and, thus, are suitable for applications, such as aerospace and electric vehicles. However, the complex machine model causes difficulties in controller design. Besides, having 32 voltage vectors with various effects on currents and torque, the selection of the optimal switching state becomes a challenge to achieve a performance tradeoff. This paper proposes an improved model predictive direct torque control (MPDTC) strategy consisting of a quadratic evaluation method (QEM) and a harmonic voltage elimination method (HVEM). In QEM, the preliminary vector is first chosen from the vectors of the outer decagon according to a cost function for torque and flux regulation. This preliminary vector, composed of three sets of different amplitudes, is further synthesized according to the error between the actual torque/flux and the references. In this way, the optimal voltage vector can be obtained without significantly increasing the computational burden. In HVEM, by subtracting the harmonics voltage component from the vector determined previously in QEM, the final voltage vector is obtained for mitigating stator harmonic currents. The proposed control strategy is compared with the conventional MPDTC approach. The results confirm the effectiveness of the proposed methods with good steady-state performance while maintaining quick dynamic responses.
机译：五相永磁同步电动机提供高容错能力和每RMS安培的高扭矩的优点，因此适用于航空航天和电动车辆等应用。但是，复杂的机器模型导致控制器设计困难。此外，具有用于电流和扭矩的各种效果的32个电压矢量，最佳切换状态的选择成为实现性能权衡的挑战。本文提出了一种改进的模型预测直接扭矩控制（MPDTC）策略，包括二次评估方法（QEM）和谐波电压消除方法（HVEM）。在QEM中，根据扭矩和通量调节的成本函数，首先从外部分板的矢量中选择初步向量。该初步载体由三组不同的幅度组成，根据实际扭矩/通量和参考文献之间的误差进一步合成。以这种方式，可以获得最佳电压矢量而不会显着增加计算负担。在HVEM中，通过从先前在QEM中确定的向量中减去谐波电压分量，获得最终电压向量以用于减轻定子谐波电流。将所提出的控制策略与传统的MPDTC方法进行比较。结果证实了所提出的方法的有效性，同时保持快速动态响应。

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