Open AccessProportion and failure analysis of full‐bridge sub‐modules in a hybrid MMC
Author(s) -
Song Yonghui,
Luo Yongjie,
Xiong Xiaofu,
Lian Rui
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8445
Subject(s) - modular design , fault (geology) , bridge (graph theory) , capacitor , capacitance , voltage , computer science , blocking (statistics) , electronic engineering , electrical engineering , engineering , physics , medicine , computer network , quantum mechanics , seismology , geology , operating system , electrode
Isolating DC bipolar short‐circuit fault is one of the difficulties faced by the flexible DC distribution system. This study aims to the hybrid modular multi‐level converter (MMC). Firstly, the fault‐blocking mechanism of a hybrid MMC is analysed. Through theoretical calculation, the influence of the proportion of full‐bridge sub‐modules η on the fault isolation capability is obtained in the process of bipolar short‐circuiting of the hybrid MMC‐isolated DC side. Finally, the hybrid MMC DC‐side bipolar short‐circuit fault is simulated and analysed by the simulation model built in PSCAD/EMTDC software. The fault blocking capability of hybrid MMC and the relationship between η and the full‐bridge sub‐module capacitance voltage after the fault isolation phase are verified, which provides a theoretical basis for the design of the withstand voltage of hybrid MMC full‐bridge sub‐module capacitors.