Failure Analysis and Protection Strategy for MMC-UPQC

doi:10.3969/j.issn.1000-7229.2015.05.006

Abstract

Abstract:

Applying the topology structure of modular multilevel converter （MMC） in unified power quality controller （UPQC） can improve the applicative capacity and voltage level of UPQC, which can expand the application of UPQC in medium voltage field, and make UPQC has wider application prospects. However, when the short-circuit fault occurs on the load side, how to logically operate to ensure the safe and reliable operation of UPQC, is not only the system requirement for the device, but also its own requirement for the device to protect itself. On this basis, this paper presented the principle of fault protection strategy for MMC-UPQC, which adopts the interaction between the branch of anti-parallel thyristor and circuit breaker to isolate the MMC in series from the fault line, and ensure the effective protection for the device. The simulation results in PSCAD/EMTDC environment have demonstrated the effectiveness and feasibility of the proposed method.

Key words: unified power quality conditioner （UPQC）, modular multilevel converter （MMC）, fault protection, circuit breaker, anti-parallel thyristor

CLC Number:

TM 76

LU Jingjing, LIU Zhengfu, ZHANG Jian, YUAN Chang, XIAO Xiangning, YANG Yongchun. Failure Analysis and Protection Strategy for MMC-UPQC[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(5): 31-36.

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