Pre-charging and DC fault ride-through of hybrid MMC based HVDC systems

Zeng, Rong and Xu, Lie and Yao, Liangzhong and Morrow, D John (2015) Pre-charging and DC fault ride-through of hybrid MMC based HVDC systems. IEEE Transactions on Power Delivery. ISSN 0885-8977 (

[thumbnail of Zeng-etal-IEEETOPD-2015-Pre-charging-and-DC-Fault-Ride-Through] PDF. Filename: Zeng_etal_IEEETOPD_2015_Pre_charging_and_DC_Fault_Ride_Through.pdf
Accepted Author Manuscript

Download (974kB)


Compared to half-bridge based MMCs, full-bridge based systems have the advantage of blocking dc fault, but at the expense of increased power semiconductors and power losses. In view of the relationships among ac/dc voltages and currents in full-bridge based MMC with the negative voltage state, this paper provides a detailed analysis on the link between capacitor voltage variation and the maximum modulation index. A hybrid MMC, consisting of mixed half-bridge and full-bridge circuits to combine their respective advantages is investigated in terms of its pre-charging process and transient dc fault ride-through capability. Simulation and experiment results demonstrate the feasibility and validity of the proposed strategy for a full-bridge based MMC and the hybrid MMC.


Zeng, Rong, Xu, Lie ORCID logoORCID:, Yao, Liangzhong and Morrow, D John;