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Volume 13
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10.3390/electronics13244993
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Article

An Isolated Modular Multilevel DC Converter with Unipolar-to-Bipolar Conversion

by
Haiqing Cai
1,
Jingpeng Yue
2,
Ranran An
2,
Haohan Gu
1,* and
Zihan Zhang
2
1
CSG Electric Power Research Institute, Guangzhou 510663, China
2
Electric Power Science Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510530, China
*
Author to whom correspondence should be addressed.
Electronics 2024, 13(24), 4993; https://doi.org/10.3390/electronics13244993
Submission received: 18 October 2024 / Revised: 8 December 2024 / Accepted: 9 December 2024 / Published: 19 December 2024
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Abstract

Deep-sea offshore wind power generation has gained increasing attention in the past decade. The low cost and high efficiency of the DC grid system make it more competitive when the transmission distance is over 100 km. As the key enabler of the DC grids, DC converters are necessitated to interconnect the DC lines with different voltage levels. Instead of using auxiliary circuits, this paper proposes a low-cost isolated modular multilevel DC converter (IMMDC) with unipolar-to-bipolar conversion topology to fit into the DC grids with different configurations. Moreover, the proposed DC-current-injection-based fault-tolerant scheme can maintain around 50% power transmission capability even under single pole open-circuit fault conditions for a certain period, enhancing the power supply continuity. The modularity and scalability of the proposed IMMDC topology can fit into different DC grid systems. The effectiveness and feasibility of the proposed topology and control strategy are verified using a 50 kV/±300 kV/100 MW MATLAB/Simulink 2022b simulation model.
Keywords: unipolar-to-bipolar converter; isolated; DC converters; modular multilevel structure unipolar-to-bipolar converter; isolated; DC converters; modular multilevel structure

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MDPI and ACS Style

Cai, H.; Yue, J.; An, R.; Gu, H.; Zhang, Z. An Isolated Modular Multilevel DC Converter with Unipolar-to-Bipolar Conversion. Electronics 2024, 13, 4993. https://doi.org/10.3390/electronics13244993

AMA Style

Cai H, Yue J, An R, Gu H, Zhang Z. An Isolated Modular Multilevel DC Converter with Unipolar-to-Bipolar Conversion. Electronics. 2024; 13(24):4993. https://doi.org/10.3390/electronics13244993

Chicago/Turabian Style

Cai, Haiqing, Jingpeng Yue, Ranran An, Haohan Gu, and Zihan Zhang. 2024. "An Isolated Modular Multilevel DC Converter with Unipolar-to-Bipolar Conversion" Electronics 13, no. 24: 4993. https://doi.org/10.3390/electronics13244993

APA Style

Cai, H., Yue, J., An, R., Gu, H., & Zhang, Z. (2024). An Isolated Modular Multilevel DC Converter with Unipolar-to-Bipolar Conversion. Electronics, 13(24), 4993. https://doi.org/10.3390/electronics13244993

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