| Abstract |
This paper proposed a sorting-based condition monitoring strategy for capacitors of submodule (SM) in modular multilevel converters (MMCs). It reveals the relationship between the capacitor's capacitance and SM insertion time. Based on the relationship, the capacitances of SM capacitors in the arm are indirectly sorted, and only the capacitor with smallest capacitance in the arm are monitored. The proposed strategy not only realizes capacitance monitoring in MMCs for sorting-based method, but also proposes a simplified monitoring algorithm for MMCs with large number of capacitors. The simulation and experimental results confirm the effectiveness of the proposed monitoring strategy for MMCs. |
