Systematic optimization over a wide power range is often achieved through the
combination of modules of different power levels. This paper addresses the
issue of enhancing the efficiency of a multiple module system connected in
parallel during operation and proposes an algorithm based on equal incremental
cost for dynamic load allocation. Initially, a polynomial fitting technique is
employed to fit efficiency test points for individual modules. Subsequently,
the equal incremental cost-based optimization is utilized to formulate an
efficiency optimization and allocation scheme for the multi-module system. A
simulated annealing algorithm is applied to determine the optimal power output
strategy for each module at given total power flow requirement. Finally, a dual
active bridge (DAB) experimental prototype with two
input-parallel-output-parallel (IPOP) configurations is constructed to validate
the effectiveness of the proposed strategy. Experimental results demonstrate
that under the 800W operating condition, the approach in this paper achieves an
efficiency improvement of over 0.74\% by comparison with equal power sharing
between both modules