Research on Fuzzy Weighted Controller for Battery Discharge of Dual-Channel Dual-Active Bridge

Aiming at the dual closed-loop control of dual-active bridge (DAB) charging and discharging circuits in energy storage devices, which is difficult to allocate discharging current reasonably based on battery performance, a fuzzy weighted controller with battery pack voltage and its variation as input is proposed. The domain of the fuzzy controller is designed and the fuzzy solution is achieved through the weighted average method. The obtained output is combined with the weighting law to construct a fuzzy weighted control law, Thus, adaptive allocation of battery discharging current for each channel is achieved. By building a simulation model, the proposed fuzzy weighted control law is applied to a dual channel dual active bridge circuit for simulation verification. The experimental results show that the fuzzy weighted controller based on dual channel and dual active bridge battery discharge can achieve dynamic voltage equalization of battery packs with different performance under discharging conditions, thus verifying the correctness of the theoretical and design methods studied in this paper.