A Hybrid Modular Multilevel Converter With Reduced Full-Bridge Submodules

被引：20
|
作者：
Li, Rui [1 ]
Xu, Lie [1 ]
Yu, Lujie [2 ]
Yao, Liangzhong [3 ]
机构：
[1] Univ Strathclyde, Dept Elect & Elect Engn, Glasgow G1 1XW, Lanark, Scotland
[2] Tianjin Univ, Sch Elect & Informat Engn, Tianjin 300072, Peoples R China
[3] Wuhan Univ, Sch Elect Engn & Automat, Wuhan 430072, Peoples R China
来源：
IEEE TRANSACTIONS ON POWER DELIVERY | 2020年 / 35卷 / 04期
关键词：
DC fault; DC circuit breaker (DCCB); HVDC transmission; hybrid multilevel converter; modular multilevel converter (MMC); ALTERNATE ARM CONVERTER; HVDC SYSTEMS; DESIGN; VOLTAGE; PROTECTION; OPERATION; BREAKER; CELLS; MMC;
D O I：
10.1109/TPWRD.2019.2956265
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A hybrid modular multilevel converter (MMC) with reduced full-bridge (FB) submodules (SMs) is proposed, where a high voltage rating half-bridge ( HB) based MMC is connected in series with a low voltage rating FB-MMC in parallel with a fault breaking circuit on its DC side. Unlike conventional hybrid MMCs with mixed HB and FB SMs, the proposed topology uses the DC capacitor in the fault breaking circuit to block DC faults, while the FB-MMC only commutates the fault current from the FB-MMC to the fault breaking circuit. Thus, the proposed converter only requires around 10%-20% FB SMs, leading to reduced capital cost and losses compared to typical hybrid MMC. The optimal ratio of the FB-MMC and HB-MMC is assessed and comparative studies show superiority of the proposed topology over other alternatives. A case study with 10% FB SMs demonstrates the validity of the proposed hybrid MMC for DC fault blocking and post-fault system restart.
引用
收藏
页码：1876 / 1885
页数：10
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