The most recent finite control set model predictive control (FCS-MPC) strategies for six-phase electric drives avoid the excitation of the secondary subspace by using virtual vectors to minimize the current ripple. However, these strategies can only control the fundamental current components, which adjust the machine flux and torque and leave the secondary current components unregulated, which should be zero during regular operation in order to reduce the losses in the machine. Due to this limitation and also due to the low impedance of the secondary subspace in machines with distributed windings, the stator currents might contain non-negligible low-frequency harmonics caused by small asymmetries in the machine, non-linear dynamics of the semiconductors in the power converters and back-EMF harmonics. This article proposes a novel multistage predictive current control strategy based on virtual vectors (MVV-PCC) for six-phase drives based on permanent magnet synchronous machines (PMSMs), which contains a fundamental and a secondary control stages that are responsible for tracking the reference currents in both subspaces separately. The obtained experimental results validate the effectiveness of the proposed strategy in the minimization of the current harmonics and the reduction of the torque ripple for different operating conditions of the six-phase drive.

中文翻译：

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基于虚拟矢量的多级预测电流控制，用于降低六相永磁同步电机的电流谐波

用于六相电驱动器的最新有限控制集模型预测控制（FCS-MPC）策略通过使用虚拟矢量来最大程度地减小电流纹波来避免次级子空间的励磁。但是，这些策略只能控制基本电流分量，这些基本电流分量会调整电机的磁通量和转矩，并使次级电流分量不受调节，在正常运行期间，次级电流分量应为零，以减少电机的损耗。由于此限制以及由于具有分布绕组的电机中次级子空间的低阻抗，定子电流可能包含由于电机中的不对称性较小，电机中半导体的非线性动力学而引起的不可忽略的低频谐波。电源转换器和反电动势谐波。本文针对基于永磁同步电机（PMSM）的六相驱动器，提出了一种基于虚拟矢量（MVV-PCC）的新颖的多级预测电流控制策略，该策略包含负责跟踪参考电压的基本和辅助控制级两个子空间中的电流分别。获得的实验结果验证了所提出策略在最小化六相驱动器不同工作条件下的电流谐波和减小转矩脉动方面的有效性。