Practical Submodule Capacitor Sizing for Modular Multilevel Converter Considering Grid Faults

被引：3
|
作者：
Yin, Zhijian [1 ]
Qiu, Huan [2 ]
Yang, Yongheng [1 ]
Tang, Yi [2 ]
Wang, Huai [1 ]
机构：
[1] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark
[2] Nanyang Technol Univ, Singapore 639798, Singapore
来源：
APPLIED SCIENCES-BASEL | 2020年 / 10卷 / 10期
关键词：
modular multilevel converter (MMC); submodule capacitor design; grid faults; transient state; reliability; VOLTAGE RIPPLES; HVDC SYSTEM; MMC-HVDC; OPERATION;
D O I：
10.3390/app10103550
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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.
引用
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页数：17
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