This paper proposes the selective voltage balancing scheme of a modular multilevel DC-DC converter for solid-state transformers. In
general, the sub-module capacitor voltage can be controlled uniformly by individual feedback controllers, however computation time
increases according to the number of modules. The voltage balance control scheme in this paper can reduce the computation time
by selecting and controlling sub-module of maximum/minimum voltage momentarily. The performance of the proposed selective
voltage balancing scheme is verified by simulation.
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