Modular Multilevel Series/Parallel Converter for Bipolar DC Distribution and Transmission

Journal article (2021)

Authors

Ricardo Lizana Universidad Católica de la Santísima Concepción
Sebastian Rivera Universidad de los Andes, Chile
Zhongxi Li Duke University
Apparao Dekka Lakehead University
Luis Rosenthal Universidad Católica de la Santísima Concepción
Hans Bahamonde I. Universidad Católica de la Santísima Concepción
Angel V. Peterchev Duke University
Stefan M. Goetz Duke University
Affiliation
External organisation
Dc distribution Dc bipolar systems Dc transmission Multilevel converter
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Published Date

2021-4

Language

English

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Abstract

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.