Transient Voltage Dip Mitigation System Based On Hybrid Modular Multilevel Converters

This publication presents a novel concept of a mitigation system for transient voltage dips, using a back-to-back HVDC system based on Hybrid Modular Multilevel Converters which could be used for sensitive loads such as critical systems for particle accelerators. The objective of this topology is the reduction of the internal energy storage requirements of the converters compared to conventional Half-Bridge Modular Multilevel Converter topologies. This novel hybrid topology allows to extend the modulation index range beyond one without distortion of the output voltages.