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- Title
Modular multilevel converter based on arm transfer to clear dc fault.
- Authors
Zhenhao Wang; Jie Liu; Zhuang Xiao; Chaobin Wang; Guoqing Li
- Abstract
Modular multilevel converter (MMC) has great prospects in voltage source converter-based high-voltage direct current (HVDC) transmission. Although the typical half-bridge MMC can bring huge economic benefits, it is unable to clear dc fault. An MMC based on arm transfer (AT-MMC) and corresponding timing control are presented to effectively solve this drawback. Compared with the half-bridge MMC, the AT-MMC adds the arm-transferring branch to the each phase unit of the converter and adds the current-breaking branch and the energy-absorbing branch to the dc line. Through these branches cooperating with each other, the fault current is cleared. Referring to the half-bridge MMC with the same voltage grade, the ATMMC has a good economy and its additional device cost is low and additional conduction loss is very small. A model of 51-level MMC-HVDC system is built in RT-LAB OP5600 to verify the effectiveness of the proposed solution.
- Subjects
ARMS transfers; FAULT currents; DIRECT currents; IDEAL sources (Electric circuits)
- Publication
IET Generation, Transmission & Distribution (Wiley-Blackwell), 2019, Vol 13, Issue 22, p5042
- ISSN
1751-8687
- Publication type
Article
- DOI
10.1049/iet-gtd.2018.6311