Design Approach of Inductive Components in Medium Voltage Modular Multilevel Converter Considering DC Side Fault Protection Conditions

摘要

The Modular Multilevel Converter (MMC) is increasingly used in Medium Voltage Applications, specially in locations where the AC voltage is over tens of kilovolts (10 kV, 13.8 kV, 20 kV). In fact, a big advantage intrinsic to the MMC is the ability to clear faults within the topology itself, which leads to savings in DC breakers in the 10-20 kV range. However, this feature affects the design of the converter’s inductances (DC, arm and AC side). Although many papers have addressed the design of these passive elements, a systematic approach considering both steady state and fault operation is still missing. This paper presents a design methodology for the inductive components of the MMC in medium voltage applications