Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 10, Pages 9719-9730Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3026277
Keywords
Circuit faults; Thyristors; Fault currents; Switches; Hidden Markov models; HVDC transmission; Inductors; DC line faults; modular multilevel converters (MMCs); thyristor; unipolar full-bridge (UFB) submodule (SM)
Categories
Funding
- National Natural Science Foundation of China [61873062]
- Natural Science Foundation of Jiangsu Province [BK20180395]
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The study proposes a CTB-based HMMC for protecting HVdc systems under dc line short-circuit faults, with current interruption capability.
The modular multilevel converter (MMC) is attractive for high-voltage direct current (HVdc) applications. The dc line short-circuit fault is one of the key challenges for the HVdc system. In this article, a crossing thyristor branches (CTB)-based hybrid MMC (HMMC) with current interruption capability is proposed to protect the HVdc system under dc line short-circuit faults. In the CTB-HMMC, the thyristor branches are proposed to crossing-connect different arm inductors and each arm consists of unipolar full-bridge (UFB) submodules (SMs) and half-bridge SMs, where the CTB effectively reduces the UFB-SMs number in the arm of the HMMC with current interruption capability. The current interruption operations, including dc-side and ac-side current interruption, are also proposed for the CTB-HMMC in case of dc line short-circuit faults, where the proposed CTB-HMMC can interrupt the fault current with the advantages of fewer UFB-SMs in the arm, short current interruption time, low semiconductor cost, and low power losses. The simulation studies are conducted and a down-scale prototype is built, and the study results verify the effectiveness of the proposed CTB-HMMC and operation principles.
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