Active Current-transferring Modular Multilevel Converter with DC Fault Blocking Capability

被引：0

作者：

Chen Z. ^{[1
]}

Chen W. ^{[1
]}

Liu Z. ^{[2
]}

Zuo X. ^{[3
]}

Shi S. ^{[4
]}

Xue Z. ^{[2
]}

机构：

[1] Center for Advanced Power-conversion Technology and Equipment, Southeast University, Nanjing

[2] State Grid Yangzhou Power Supply Company, Yangzhou

[3] State Grid Beijing Electric Power Co., Ltd., Beijing

[4] Department of Electrical Engineering, Tsinghua University, Beijing

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2021年 / 45卷 / 04期

关键词：

Current reverse; DC fault blocking; DC short-circuit fault; Flexible DC distribution; Flexible DC transmission; Modular multilevel converter (MMC);

D O I：

10.7500/AEPS20200510002

中图分类号：

学科分类号：

摘要：

Modular multilevel converter (MMC) with DC fault blocking capability is the key equipment for the flexible DC transmission and distribution technology. Aiming at the problem that traditional half-bridge MMC cannot block DC short-circuit fault, an active current transferring MMC with DC fault blocking capability is proposed by combining the existing fault blocking schemes. The current breaking branch, the bridge arm blocking branch and the energy absorbing branch are added to the topology. Once a DC fault occurs, the current breaking branch is disconnected to transfer the fault current actively and reverse the arm current simultaneously, and then the fault energy in MMC can be absorbed with half-bridge submodules. Meanwhile, capacitors also operate to absorb the fault energy on the line side during the blocking process of full-bridge submodules in the energy absorbing branch. Thus the short-circuit fault is blocked quickly. The fault blocking mechanism is analyzed in detail by establishing the active current transferring MMC model, and a single-end 100 kV/25-level simulation model is built in MATLAB/Simulink to verify the feasibility and effectiveness of the proposed topology. © 2021 Automation of Electric Power Systems Press.

引用

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页码：106 / 114

页数：8

共 25 条

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