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Increasing numbers of decentralized energy resources with fluctuating behaviour lead to higher prediction errors of the production forecast (quantity and location) and raise the risk of large-scale blackouts. With the concept of modular grids (MGs) a decentralized operation of subgrids is achievable by the use of a power electronic grid interconnector (GIC) [1]. This paper shows a novel approach for an islanded operation of MGs to supply customers with energy during large-scale blackouts of the upstream grid. To investigate the proposed concept, controllable actors, the GIC and the CIGRÉ medium voltage benchmark network [2] are modelled in DIgSILENT PowerFactory. Achieved results are presented in this paper. ABBREVATIONS DER decentralized GIC power electronic energy resources grid interconnector DSO distribution system MG modular grid operator MV medium voltage FC frequency control SOC state of charge GESS grid-supporting SOZ stable operation energy storage zone system UG upstream grid