Abstract

Nowadays, finite control set model predictive control techniques are widely used for variable speed Permanent Magnet Synchronous Motor (PMSM) drive applications due to its simple, intuitive algorithm and easy inclusion of motor objectives. In conventional predictive torque control (PTC) method, both torque and flux are controlled by a cost function optimization, where it introduces weighting factors. The selection and tuning of weighting factors is difficult since it affects torque and flux performance of PMSM drive. In this article, a two-step PTC for PMSM drive is proposed, where the flux control objective is replaced with the reactive torque component. Therefore, optimal torque and flux controlling of PMSM is achieved with similar units for both control objectives. Hence, it eliminates weighting factor tuning problem and reduces the average torque and flux ripples over a two sample instants. Additionally, the reduced voltage vector strategy is proposed, so that increased computational efficiency is achieved. To validate the proposed methodology, simulations and experimental tests are conducted for three phase PMSM drive. The obtained simulation and experimental results justify an improved torque and flux response with reduced computational burden when compared to existing PTC methods.

摘要

如今，有限控制集模型预测控制技术因其简单、直观的算法和容易包含电机目标而广泛用于变速永磁同步电机 (PMSM) 驱动应用。在传统的预测扭矩控制 (PTC) 方法中，扭矩和磁通都由成本函数优化控制，其中引入了加权因子。加权因子的选择和调整很困难，因为它会影响 PMSM 驱动器的转矩和磁通性能。在本文中，提出了一种用于 PMSM 驱动的两步 PTC，其中磁通控制目标被无功转矩分量取代。因此，PMSM 的最佳转矩和磁通控制是通过类似的单元实现的，用于两个控制目标。因此，它消除了加权因子调谐问题，并减少了两个采样瞬间的平均转矩和磁通脉动。此外，还提出了降低电压矢量策略，从而提高了计算效率。为了验证所提出的方法，对三相 PMSM 驱动进行了模拟和实验测试。与现有的 PTC 方法相比，获得的模拟和实验结果证明了在减少计算负担的情况下改进的扭矩和通量响应是合理的。