标题：Novel fault current-limiting scheme for MMC-based flexible HVDC system
作者：Ma, Yueyang ;Zou, Guibin ;Song, Shenglan ;Guo, Jianbao ;Gao, Zhanjun
作者机构：[Ma, Yueyang ;Zou, Guibin ;Gao, Zhanjun ] School of Electrical Engineering, Shandong University, Jinan, China;[Guo, Jianbao ] China Southern Power Gri 更多
来源：Journal of Engineering
摘要：Currently, the flexible direct current transmission technique becomes a research focus around the world, and be applied in power engineering projects gradually. However, due to the topology of the modular multi-level converter (MMC), a rapidly rising fault current will appear in case of the fault on the DC side, which constraints the development of MMC-based flexible high-voltage direct current (MMC-HVDC) system. To restraint the fault current, this paper proposes a novel fault current-limiting scheme for symmetrical bipolar MMC-HVDC system, which consists of a current-limiting resistance and dozens of serial controllable power electronics in parallel with the current-limiting resistance. The current-limiting resistance is designed to reduce the fault current and the requirement for the direct current circuit breaker (DCCB) capacity. The novel current-limiting scheme configuration and operation principles are analysed. Finally, a symmetric bipolar MMC-HVDC system model is constructed, and simulation results show the feasibility of the proposed fault current-limiting scheme.
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