TY - JOUR
T1 - A New Topology of Multilevel VSC Converter for a Hybrid HVDC Transmission System
AU - Jung, Jae Jung
AU - Cui, Shenghui
AU - Lee, Joon Hee
AU - Sul, Seung Ki
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2017/6
Y1 - 2017/6
N2 - This paper introduces a new multilevel converter topology for a hybrid HVDC system comprising line-commutated converter (LCC) and voltage source converter (VSC). Among the existing modular multilevel converter (MMC) topologies for the hybrid HVDC, a mixed MMC structure with half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) has characteristics of reduced system cost, low operation loss, but still keeping capability to cope with dc short-circuit fault. However, it is very difficult for the conventional hybrid MMC structure to balance the submodule capacitor voltages under dc-bus voltage sliding since each MMC arm is a mixture of HBSMs and FBSMs. To solve the defect of the conventional hybrid MMC structure, an asymmetric mixed MMC, in which one arm is made of series-connected HBSMs and other arm is made of FBSMs, is devised. The proposed asymmetric MMC can regulate the dc-bus voltage freely without uncontrollable submodule capacitor voltages. The problems of the conventional MMC structure and the validity of asymmetric MMC are verified by both computer simulation and experimental results.
AB - This paper introduces a new multilevel converter topology for a hybrid HVDC system comprising line-commutated converter (LCC) and voltage source converter (VSC). Among the existing modular multilevel converter (MMC) topologies for the hybrid HVDC, a mixed MMC structure with half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) has characteristics of reduced system cost, low operation loss, but still keeping capability to cope with dc short-circuit fault. However, it is very difficult for the conventional hybrid MMC structure to balance the submodule capacitor voltages under dc-bus voltage sliding since each MMC arm is a mixture of HBSMs and FBSMs. To solve the defect of the conventional hybrid MMC structure, an asymmetric mixed MMC, in which one arm is made of series-connected HBSMs and other arm is made of FBSMs, is devised. The proposed asymmetric MMC can regulate the dc-bus voltage freely without uncontrollable submodule capacitor voltages. The problems of the conventional MMC structure and the validity of asymmetric MMC are verified by both computer simulation and experimental results.
KW - DC short-circuit fault
KW - hybrid HVDC transmission system
KW - hybrid modular multilevel converter (MMC)
KW - line-commutated converter (LCC)
KW - MMC
UR - http://www.scopus.com/inward/record.url?scp=85013059477&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2016.2598368
DO - 10.1109/TPEL.2016.2598368
M3 - Article
AN - SCOPUS:85013059477
SN - 0885-8993
VL - 32
SP - 4199
EP - 4209
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 6
M1 - 7534748
ER -