Improved Model Predictive Current Control for Three-Level NPC Inverter-Fed Long-Stator LSM Drives

Inhalt:
Due to the inability of traditional finite set model predictive control to achieve precise and continuous control, the steady-state current ripple is relatively large, and the control performance is easily affected by operating conditions such as bus voltage utilization.Additionally, for the three-level inverter, there exists a coupling problem between neutral point voltage balancing control and current control within the cost function. To address these challenges, an improved model predictive current control method is proposed. The method is based on the principle of deadbeat control and employs a Bang-Bang Neutral Point Balancing strategy, enabling more precise voltage vector output and eliminating weighting factors. Under the same control frequency, it achieves better current control performance and decoupled control for neutral point potential balance. Simulink simulation results verify the effectiveness of the proposed method.