Open AccessModular multilevel converter based on arm transfer to clear dc fault
Author(s) -
Wang Zhenhao,
Liu Jie,
Xiao Zhuang,
Wang Chaobin,
Li Guoqing
Publication year - 2019
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2018.6311
Subject(s) - modular design , fault (geology) , clearance , high voltage direct current , transmission system , voltage , computer science , current (fluid) , bridge (graph theory) , hvdc converter station , direct current , engineering , control theory (sociology) , electrical engineering , transmission (telecommunications) , control (management) , medicine , artificial intelligence , seismology , urology , geology , operating system
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 AT‐MMC 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.