Multi-objective Decoupling MPC Strategy for Bidirectional Neutral Point Clamped DC/DC Converter Applied in Energy Storage System

This paper proposes a multi-objective decoupling MPC (MOD-MPC) strategy based on a dual-carrier modulation method for the bidirectional neutral point clamped DC/DC converter (B.XPCDC). Firstly, the mathematical models of the BNPCDC in different operating modes is established by analyzing the multi-branch modeling of split capacitors. On this basis, the MOD-MPC strategy is proposed by analyzing the relationship between the system current and split capacitor voltage. The strategy not only effectively reduces the computational load through solving the optimal duty ratio but also demonstrates favorable performance in both voltage balancing and current control. The effectiveness of the proposed strategy is verified through experimental validation.