Three-Vector Model Predictive Control Strategy for NPC Three-Level Inverter
摘要
This article proposes a three vector model predictive control strategy based for the Neutral Point Clamped (NPC) three-level inverter to reduce current ripple. The proposed three-vector model predictive current control synthesizes a new voltage vector using three vectors from the vicinity of the small sector, effectively utilizing three voltage vectors per control cycle. This approach improves the quality of the output current and reduces current ripple. To balance the neutral-point voltage, a switching control method is employed, which selects a new synthesized voltage vector that minimizes the impact on the neutral-point potential fluctuations. Simulation results show that the total harmonic distortion (THD) value of the three-vector model predictive control is approximately 1.4% lower than that of the single-vector control, significantly enhancing the current quality. Additionally, the switching control method effectively stabilizes the neutral-point capacitor voltage.