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Operation of the four-leg three-level flying capacitor Grid-Connected Converter (GCC) for renewable energy source (RES) is presented in this paper. The GCC with proposed hierarchical control method enables operation in presence of electrical grid disturbances by switching all legs separately to stand-alone or gridconnected mode of operation, allowing energy transfer between them. Four-leg flying capacitor GCC with described control method may be treated as DC microgrid supplied from three independent AC sources and RES. Therefore, the hierarchical control allows for effective power management of such system. The paper describes developed control system as well as presents simulation and experimental results measured on the 10 kVA laboratory converter.

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