CAPACITOR-ASSISTED CIRCUIT BREAKER FOR MEDIUM-VOLTAGE FLEXIBLE DC DISTRIBUTION NETWORKS

被引：0

作者：

Dai, Zhihui ^{[1
]}

Liu, Shanshan ^{[1
]}

Li, Yiran ^{[1
]}

机构：

[1] State Key Laboratory Alternate Electrical Power System with Renewable Energy Sources(NCEPU), Baoding

来源：

Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2024年 / 45卷 / 09期

关键词：

capacitance; DC short circuit breaker; fault current limiters; flexible DC distribution network; short circuit currents;

D O I：

10.19912/j.0254-0096.tynxb.2023-0792

中图分类号：

学科分类号：

摘要：

Aiming at the difficulty of fault isolation caused by large short−circuit fault current and no natural zero crossing of current in flexible direct distribution network, a hybrid capacitor-assisted circuit breaker is proposed. The circuit breaker possesses a two-stage current limiting structure. The low-resistance current limiting module is used to quickly limit the fault current in the initial stage and achieve the fault-current transfer. The high-resistance current limiting module is used to ensure the effective isolation. It can play a current limiting role before the fault line is identified. Compared with the typical method, the capacitor-assisted module can limit the development of the initial fault current and greatly reduce the peak current value of the main-breaker branch, and it has minimum impact on the main branch during the normal operation. Finally, a six-terminal DC distribution network is established by PSCAD/EMTDC for simulation analysis, and results show that the proposed scheme can significantly limit the fault current and meet both the economy and practicality. © 2024 Science Press. All rights reserved.

引用

页码：179 / 187

页数：8

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