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Number of Levels, Arm Inductance and Modulation Trade-offs for High Power Medium Voltage Grid-Connected Modular Multilevel Converters

Conference Paper (2019)
Author(s)

Aditya Shekhar (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Lucia Beloqui Larumbe (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Thiago Batista Soeiro (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Yang Wu (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Pavol Bauer (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Research Group
DC systems, Energy conversion & Storage
URL related publication
https://ieeexplore.ieee.org/document/8797231
More Info
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Publication Year
2019
Language
English
Research Group
DC systems, Energy conversion & Storage
Article number
8797231
Pages (from-to)
197-204
Publisher
IEEE
ISBN (print)
978-1-7281-1612-9
ISBN (electronic)
978-89-5708-313-0
Event
10th International Conference on Power Electronics - ECCE Asia, ICPE 2019 - ECCE Asia (2019-05-27 - 2019-05-30), Busan, Korea, Republic of
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Abstract

There is an increasing focus on integrating flexible dc links for bulk power routing in medium voltage distribution grids. In such applications, the ac-dc Modular Multilevel Converter (MMC) devised for medium voltage and high-power ratings can be an interesting choice. This paper highlights some less explored design trade-offs arising due to the limitation on N in relation to modulation frequency and arm inductance. Specifically, the study intends to describe the interdependent influence of each degree of freedom on several aspects such as capacitor voltage balancing, circulating currents and harmonic performance. Finally, the importance of considering interhar-monies in the performance assessment of the MMC instead of the conventional interpretation of distortion calculation is highlighted.