With the rapid development of new energy generation and distributed energy storage technologies, multi-port converters have increasingly become a hot research topic in the power electronics industry. Considering the duality between inductors and capacitors in circuit theory, this paper proposes a three-port three-level converter based on split inductors. Subsequently, the operational modes of the proposed topology are analyzed, and a feasible modulation strategy is proposed along with an analysis of the corresponding PWM signal generation logic. Finally, theoretical analysis and simulation results validate the correctness and feasibility of the proposed circuit topology and modulation strategy.