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DC grids offer highly efficient distribution of electric energy, eliminating components and optimizing the use of cables. Efficient generation, however, is still based on AC generators. Power-electronic devices link generators and grid and customize energy flow to the loads. Efficient distribution with low losses demands high voltage, e.g. in the range of 10 kV for shipsize grids. Such voltages challenge power electronics as well as protective devices: Short-circuit protection with fast autoreclosing in a context where fuses are not applicable has to be solved. This paper proposes modular multilevel converters (MMC) with full-bride (4QC) modules and demonstrates fault mitigation in controlled MMC operation by measurement results. The associated control separates asset characteristic defining the steady-state and transient behaviour and converter-near control operating in the subtransient and transient regime. The feasibility of the approach is demonstrated by selected measurement results.

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