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PD modulation strategy for modular multilevel converters

This paper proposes a Phase Disposition (PD) modulation strategy for the Modular Multilevel Converter (MMC). The proposed modulation strategy produces output line-to-line voltages with 4N+1 levels. Furthermore, a sorting algorithm guarantees the individual submodule capacitor voltage balancing and a hysteresis controller keeps the inner currents into a desired band. Simulation results are presented to demonstrate the good performance of the proposed modulation strategy.