This article proposes a novel integral sliding mode (ISM)-based model predictive current control (MPCC) strategy with low computational amount for three-level neutral-point-clamped (3L-NPC) inverter-fed PMSM drives. For conventional MPCC for 3L-NPC inverter, 27 voltage vectors are evaluated for prediction and calculation in each control cycle, therefore computational burden is a major hurdle for practical implementation of MPCC. With only calculation of reference voltage and determination of its sector position, a revised MPCC strategy with neutral point potential (NPP) balancing is proposed, which not only dramatically reduces the number of candidate voltage vectors involved in cost function calculation but also effectively suppresses NPP fluctuation of 3L-NPC inverter. To enhance MPCC robustness against motor parameter variations, the integral sliding mode (ISM) is embedded into MPCC for PMSM drives by enforcing sliding mode throughout the entire system response, and thus a novel ISM-based MPCC strategy is put forward. Furthermore, its robust stability is analyzed. The results of simulation experiments confirm that the proposed ISM-based MPCC strategy with NPP balancing for 3L-NPC inverter can enable PMSM drive system to have satisfactory control performance and strong robustness against motor parameter variations.

中文翻译：

---

三电平中性点钳位逆变供电永磁同步电机驱动系统的低计算量积分滑模模型预测电流控制

本文提出了一种新的基于积分滑模 (ISM) 的模型预测电流控制 (MPCC) 策略，该策略具有低计算量的三电平中性点钳位 (3L-NPC) 逆变器供电 PMSM 驱动器。对于用于 3L-NPC 逆变器的常规 MPCC，在每个控制周期中评估 27 个电压矢量以进行预测和计算，因此计算负担是 MPCC 实际实施的主要障碍。仅通过计算参考电压并确定其扇区位置，提出了一种修正的具有中性点电位（NPP）平衡的MPCC策略，不仅大大减少了成本函数计算中涉及的候选电压向量的数量，而且有效地抑制了NPP波动3L-NPC逆变器。为了增强 MPCC 对电机参数变化的鲁棒性，通过在整个系统响应中强制执行滑模，将积分滑模（ISM）嵌入到用于 PMSM 驱动的 MPCC 中，因此提出了一种新的基于 ISM 的 MPCC 策略。此外，分析了其鲁棒稳定性。仿真实验结果证实，所提出的3L-NPC逆变器具有NPP平衡的基于ISM的MPCC策略可以使PMSM驱动系统具有令人满意的控制性能和对电机参数变化的强鲁棒性。