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Mathematical Problems in Engineering
Volume 2015, Article ID 512471, 11 pages
Research Article

A Hybrid MMC Topology with dc Fault Ride-Through Capability for MTDC Transmission System

1School of Electrical Engineering, Shandong University, Jinan 250061, China
2State Grid of China Technology College, Jinan 250002, China

Received 1 April 2015; Revised 18 July 2015; Accepted 21 July 2015

Academic Editor: Ruben Specogna

Copyright © 2015 Xinhan Meng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper proposes a hybrid modular multilevel converter (MMC) topology based on mismatched-cascade mechanism. The blocking conditions of different submodule (SM) structures under dc fault are analyzed and a series double submodule is presented. With series-double submodules and mismatched-cascade submodules, the proposed hybrid MMC can ride-through the dc side short-circuit fault and provide an output voltage with the feature of low harmonic content. This hybrid MMC topology can be used in the VSC based multiterminal dc (VSC-MTDC) transmission system. The dc fault ride-through properties of the new structure and the total harmonic distortion (THD) are analyzed compared with the previous full-bridge and clamp-double architectures. An appropriate fault blocking procedure is presented, and a typical four-terminal dc transmission simulation system is given in the power system simulation software. Finally, simulation of steady-state and dc bipolar short-circuit fault verifies that the MTDC system based on this new hybrid MMC topology is stabilized and can block the dc fault and return the nonfault parts to normal.