Abstract
For the capacitor fluctuation problem of modular multilevel converter (MMC) sub-module, this paper presents a voltage fluctuation suppression strategy for MMC submodule injected with common mode voltage and circulating current. Firstly, make the system work in a higher modulation ratio state by injecting common mode voltage. Then, according to the mathematical mode of the MMC half-bridge sub-module, the analytical formula of the bridge arm power after the common mode voltage is injected is derived. From the perspective of reducing the power fluctuation of the bridge arm, a circulation current injection strategy is proposed, which realizes the voltage fluctuation suppression of the MMC sub-module that injects the common mode voltage and the circulation current at the same time. Finally, the effectiveness of the strategy proposed in this paper was verified through a 14-level MMC experiment platform, and the experimental results show that the capacitance fluctuation amplitude of the small module can be greatly reduced.
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References
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Acknowledgement
This paper is completed under the guidance and help of my tutor Mr. Jiang Youhua. In the process of the project research, the teacher has given me a lot of active and guidance, whether in the determination of the research direction of the paper or the debugging of the simulation model. I also truly feel the teacher’s profound professional knowledge, rigorous academic attitude and modest way of life, these will become the example of my life. In addition, the completion of this article is also inseparable from the strong support of various fund projects. Here, I would like to express my sincere gratitude to the National Natural Science Foundation of China (51877130), Shanghai Science and Technology Innovation Action Plan (19DZ1205402) and the Science and Technology Project of State Corporation of China (Contract No.: B30940200009).
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Zhao, L., Chen, F., Guo, M., Jing, X., Jiang, Y. (2022). The Voltage Fluctuation Strategy of MMC Submodule Injected with Common Mode Voltage and Circulation. In: Li, X. (eds) Advances in Intelligent Automation and Soft Computing. IASC 2021. Lecture Notes on Data Engineering and Communications Technologies, vol 80. Springer, Cham. https://doi.org/10.1007/978-3-030-81007-8_51
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DOI: https://doi.org/10.1007/978-3-030-81007-8_51
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