Abstract: To address the variable switching frequency issue in conventional finite control set model predictive control(FCS-MPC), this paper proposes a fixed-switching-frequency three-vector multi-objective predictive current control method. First, a modulated three-vector MPC strategy is adopted to stabilize the switching frequency. The cost function integrates current tracking error, neutral-point voltage balance as optimization objectives, significantly enhancing system stability. Experimental validation on a single-phase NPC inverter platform demonstrates that the proposed method achieves multi-objective optimization, rapidly balances neutral-point potential, and reduces switching frequency while maintaining fixed-frequency operation.