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  4. Modular multilevel Series/Parallel converter for bipolar DC distribution and transmission
 
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Modular multilevel Series/Parallel converter for bipolar DC distribution and transmission
Dr. Lizana-Fuentes, Ricardo 
Facultad de IngenierĂ­a 
Rivera, Sebastian
Li, Zhongxi
Dekka, Apparao
Rosenthal, Luis
Bahamonde, Hans
Peterchev, Angel
Goetz, Stefan
10.1109/JESTPE.2020.2998738
IEEE
2021
This article proposes a novel bipolar-type dc system suitable for both distribution and transmission systems based on modular multilevel series/parallel converters (MMSPCs). The system features decoupled operations of each pole of the bipolar system, being able to operate in both asymmetrical and regenerative modes. This enables two independent dc systems by using a single grid-tied converter. The MMSPC is based on a three-switch cell configuration and enables a simple balancing mechanism in combination with a wide range of output voltage frequencies. The simple balancing mechanism is the key to enable the dc operation and lead to simpler scalability for different voltage levels. Theoretical studies and experimental results are provided to verify and characterize the proposed system.
Dc bipolar systems
Dc distribution
Dc transmission
Multilevel converter
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