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Open AccessArticle

Practical Submodule Capacitor Sizing for Modular Multilevel Converter Considering Grid Faults

1
Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
2
Nanyang Technological University, Singapore 639798, Singapore
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(10), 3550; https://doi.org/10.3390/app10103550
Received: 5 April 2020 / Revised: 14 May 2020 / Accepted: 19 May 2020 / Published: 20 May 2020
(This article belongs to the Special Issue Advancing Grid-Connected Renewable Generation Systems 2019)
Submodule (SM) capacitors are key elements in the modular multilevel converter (MMC), the design of which influences the entire system performance. In practical cases, SM capacitor sizing must consider the abnormal system operation (e.g., grid faults). In order to find a clear design boundary for SM capacitors, a practical capacitor sizing method is presented for the first time in this paper, considering the grid-fault-ride-through operation of the MMC, impact of MMC control system, and aging mechanism of capacitors. The SM capacitor rated voltage, capacitance, ESR, thermal resistance, and lifetime can be decided to ensure reliable operations of the MMC during grid faults. The effectiveness of the proposed method has been verified through experimental tests on a down-scale MMC system. View Full-Text
Keywords: modular multilevel converter (MMC); submodule capacitor design; grid faults; transient state; reliability modular multilevel converter (MMC); submodule capacitor design; grid faults; transient state; reliability
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MDPI and ACS Style

Yin, Z.; Qiu, H.; Yang, Y.; Tang, Y.; Wang, H. Practical Submodule Capacitor Sizing for Modular Multilevel Converter Considering Grid Faults. Appl. Sci. 2020, 10, 3550.

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