Modulation strategy and control of Modular Cascade H-Bridge Converters as Input-side of a Multi-port Smart Transformer

This article is about the cascade connection of several H-bridges as the input side of a multi-port Smart Transformer. The paper discusses its unipolar control strategy with two different modulation techniques by connecting different loads in each module or port. The operation of both techniques and the distribution of voltage and current is analyzed using co-simulation with PSIM and SIMULINK. The best technique is determined with the study from the harmonic and efficiency point of view.