Practical Submodule Capacitor Sizing for Modular Multilevel Converter Considering Grid Faults

Zhijian Yin; Huan Qiu; Yongheng Yang; Yi Tang; Huai Wang

doi:10.3390/app10103550

Practical Submodule Capacitor Sizing for Modular Multilevel Converter Considering Grid Faults

Zhijian Yin, Huan Qiu, Yongheng Yang, Yi Tang, Huai Wang^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

5 Citations (Scopus)

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Abstract

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.

Original language	English
Article number	3550
Journal	Applied Sciences
Volume	10
Issue number	10
Pages (from-to)	1-17
Number of pages	17
DOIs	https://doi.org/10.3390/app10103550
Publication status	Published - May 2020

Keywords

Grid faults
Modular multilevel converter (MMC)
Reliability
Submodule capacitor design
Transient state

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applsci-10-03550Final published version, 3.48 MBLicence: CC BY 4.0

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title = "Practical Submodule Capacitor Sizing for Modular Multilevel Converter Considering Grid Faults",

abstract = "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.",

keywords = "Grid faults, Modular multilevel converter (MMC), Reliability, Submodule capacitor design, Transient state",

author = "Zhijian Yin and Huan Qiu and Yongheng Yang and Yi Tang and Huai Wang",

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T1 - Practical Submodule Capacitor Sizing for Modular Multilevel Converter Considering Grid Faults

AU - Yin, Zhijian

AU - Qiu, Huan

AU - Yang, Yongheng

AU - Tang, Yi

AU - Wang, Huai

PY - 2020/5

Y1 - 2020/5

N2 - 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.

AB - 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.

KW - Grid faults

KW - Modular multilevel converter (MMC)

KW - Reliability

KW - Submodule capacitor design

KW - Transient state

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DO - 10.3390/app10103550

M3 - Journal article

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JO - Applied Sciences

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Practical Submodule Capacitor Sizing for Modular Multilevel Converter Considering Grid Faults

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