Virtual Inertia Control by Modular Multilevel Converters - Relationship between Cell Capacitor Voltage and Virtual Inertia -

This paper focuses on a virtual inertia control using the stored energy in a modular multilevel converter (MMC). The authors analyze the relationship between the nominal cell capacitor voltage of the MMC and the virtual inertia created by the MMC. The theoretical analysis reveals that the MCC can create larger inertia by increasing its nominal cell capacitor voltage even if the MMC stores the same amount of energy. The effectiveness of the proposed design method is verified by computer simulations.