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Systematic optimization over a wide power range is often achieved through thecombination of modules of different power levels. This paper addresses theissue of enhancing the efficiency of a multiple module system connected inparallel during operation and proposes an algorithm based on equal incrementalcost for dynamic load allocation. Initially, a polynomial fitting technique isemployed to fit efficiency test points for individual modules. Subsequently,the equal incremental cost-based optimization is utilized to formulate anefficiency optimization and allocation scheme for the multi-module system. Asimulated annealing algorithm is applied to determine the optimal power outputstrategy for each module at given total power flow requirement. Finally, a dualactive bridge (DAB) experimental prototype with twoinput-parallel-output-parallel (IPOP) configurations is constructed to validatethe effectiveness of the proposed strategy. Experimental results demonstratethat under the 800W operating condition, the approach in this paper achieves anefficiency improvement of over 0.74\% by comparison with equal power sharingbetween both modules.

Equal Incremental Cost-Based Optimization Method to Enhance Efficiency for IPOP-Type Converters