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HYBRID MULTILEVEL CONVERTER WITH CASCADED H-BRIDGE CELLS FOR HVDC APPLICATIONS

HYBRID MULTILEVEL CONVERTER WITH CASCADED H-BRIDGE CELLS FOR HVDC APPLICATIONS

ABSTRACT:

           Hybrid multilevel converters are contemplated in an attempt to optimize the performance of voltage source converters in terms of magnitude of semiconductor losses and converter footprint, and to achieve additional features such as dc short circuit proof, which is essential for a high integrity multi-terminal HVDC grid.      Therefore, this project considers an emerging hybrid cascaded converter that offers the dc side short circuit proof feature at reduced loss and footprint compared to the existing multilevel and other hybrid converters.  Its operating principle, modulation and capacitor voltage balancing strategies are described  in  detail. Furthermore, hybrid converter scalability to high voltage applications is investigated.

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