A Novel Adaptive Model Predictive Current Control for Three-Level Simplified Neutral-Point-Clamped Inverter With Carrier-Based Modulation

This article proposes an adaptive model predictive current control for three-level simplified neutral-point-clamped inverter (3L-SNPCI), which eliminates the model dependence problem of the conventional model predictive current control (MPCC). The system parameter is estimated by a new observer with high accuracy and fast convergence. The observed parameter is then utilized by the deadbeat MPCC to attain accurate reference voltage vector calculation, achieving low computational burden and constant switching frequency. Furthermore, a novel carrier-based space vector modulation (CBSVM) is proposed to synthesize the reference VV for 3L-SNPCI. Compared to the existing space vector modulation schemes of 3L-SNPCI, the proposed CBSVM reduces the hardware implementation cost while ensuring the neutral point voltage balance. Experimental results are presented to verify the validity of the proposed method.