Abstract
With the development of new energy resources and power electronic device technology, high voltage direct current (HVDC) transmission system based on modular multilevel converter (MMC) plays an important role in the field of power transmission because of its modularity, low loss and high power conversion efficiency. However, half bridge sub-module (HBSM) of MMC can’t clear DC fault current. In order to solve this problem, reverse blocking double sub-module (RBDSM) is proposed. The RBDSM is composed of two HBSMs in series and connected with a reverse blocking circuit in parallel. The proposed sub-module (SM) can not only operate like HBSM in normal state but also protect power devices under DC fault condition. Furthermore, it can reduce much cost than previous SM which has the ability of clearing dc fault. Finally, a two terminal model of MMC was built to verify the effectiveness of the proposed topology of SM in PSCAD/EMTDC.
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