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Loss Optimization of MMC by Second-Order Harmonic Circulating Current Injection
Abstract
For high power voltage source converter based high voltage direct current transmission systems, modular multilevel converter (MMC) is the most popular circuit topology nowadays. It is known that the existence of the second-order harmonic circulating current (SHCC) component in the arm current of MMC increases the loss of the converter. Conventionally, the SHCC component eliminating methods are usually adopted to reduce the loss. The relationship between the loss of MMC and the SHCC component is analyzed first in this paper. The analysis shows that the conventional eliminating methods are not optimal in terms of the minimum loss of MMC. A loss optimization control scheme is also proposed by injecting the optimal SHCC component into the arm current of MMC, rather than eliminating the SHCC component of the arm current. The simulation and experimental results of the ±350 kV/1000 MW MMC and the down-scaled MMC setup verify the correctness and effectiveness of the proposed loss optimization method under different operation conditions.
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The injection of a specific circulating current can be used to reduce losses and capacitor voltage ripples.
“Although the main control objective regarding circulating currents initially was to suppress them completely, it has been recently proven that the injection of a specific circulating current can be used to reduce losses [91] and also capacitor voltage ripples [92].”
From Modular Multilevel Converters: Recent Achievements and Challenges (2021) · cites this paper as [91]
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References 30 · Cited by 97
Research works printed but not linked: 27
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Metadata
- Authors
- Yang, L., Li, Y., Li, Z., Wang, P., Xu, S., & Gou, R.
- Affiliations
- Chinese Academy of Sciences (CN)
- China Southern Power Grid (China) (CN)
- China XD Group (China) (CN)
- Venue
- IEEE Transactions on Power Electronics
- Published
- 2018-07
- Volume
- 33
- Issue
- 7
- Pages
- 5739-5753
- ISSN
- 0885-8993 (ISSN-L)
- 1941-0107
- OpenAlex
- W2754644785
- Cited by
- 97
- References
- 30
- Citations by year
- 2026: 7 · 2025: 11 · 2024: 15 · 2023: 13 · 2022: 12 · 2021: 11 · 2020: 12 · 2019: 7 · 2018: 8
- FWCI
- 3.18
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- IEEE Transactions on Power Electronics (publishedVersion)
- Funders
- National High-Tech R&D Program of China (2015AA050102)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › HVDC Systems and Fault Protection
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Multilevel Inverters and Converters
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Silicon Carbide Semiconductor Technologies
- Keywords
- modular multilevel converter, loss function optimization, HVDC transmission, voltage source converter
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