One of the main challenges of voltage source converter based HVDC systems is DC faults. In this paper, two different modified half-bridge modular multilevel converter topologies are proposed. The proposed converters offer a fault tolerant against the most severe pole-to-pole DC faults. The converter comprises three switches or two switches and 4 diodes in each cell, which can result in less cost and losses compared to the full-bridge modular multilevel converter. Converter structure and controls are presented including the converter modulation and capacitors balancing. MATLAB/SIMULINK simulations are carried out to verify converter operation in normal and faulty conditions.
- circuit faults
- power conversion
- bridge circuits
Ahmed, K. H., & Aboushady, A. A. (2014). Modified half-bridge modular multilevel converter for HVDC systems with DC fault ride-through capability. In IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society IEEE. https://doi.org/10.1109/IECON.2014.7049207