TY - JOUR
T1 - Pre-charging and DC fault ride-through of hybrid MMC based HVDC systems
AU - Zeng, Rong
AU - Xu, Lie
AU - Yao, Liangzhong
AU - Morrow, D John
N1 -
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PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
KW - capacitor voltage ripple
KW - modular multilevel converter
KW - DC fault
KW - hybrid power systems
U2 - 10.1109/TPWRD.2014.2360042
DO - 10.1109/TPWRD.2014.2360042
M3 - Article
SN - 0885-8977
JO - IEEE Transactions on Power Delivery
JF - IEEE Transactions on Power Delivery
ER -