Research on Fault Isolation Strategy in DC Distribution Networks Considering the Synergistic Effect of Novel Current Limiting and Circuit Breakers

被引：0

作者：

Zheng, Feng ^{[1
]}

Yang, Fan ^{[1
]}

Yang, Peipei ^{[2
]}

Liang, Ning ^{[3
]}

Wang, Weidong ^{[1
]}

机构：

[1] College of Electrical Engineering and Automation, Fuzhou University, Fujian Province, Fuzhou

[2] Lanzhou Power Supply Company, State Grid Gansu Electric Power Company, Gansu Province, Lanzhou

[3] School of Electric Power Engineering, Kunming University of Science and Technology, Yunnan Province, Kunming

来源：

Dianwang Jishu/Power System Technology | 2024年 / 48卷 / 11期

基金：

中国国家自然科学基金;

关键词：

coordinated operation strategy; DC circuit breaker; DC distribution network; fault isolation; novel fault current limiter;

D O I：

10.13335/j.1000-3673.pst.2023.1921

中图分类号：

学科分类号：

摘要：

To address issues related to rapid increases in fault currents, high peak values, and the challenge of ensuring reliable power supply in non-fault areas within DC distribution networks, a novel fault current limiter for DC grids is proposed. The limiter design incorporates a bridge circuit to diminish peak fault currents, a coupling reactance for expediting fault transfer, and a primary current-limiting branch that employs pulse-width modulation to suppress fault currents. A coordinated strategy is introduced between the proposed limiter and DC circuit breakers, utilizing voltage differential criteria and directional overcurrent protection. The effectiveness and accuracy of the proposed solution are validated through simulation systems, and preliminary experiments are conducted. Results demonstrate that the proposed limiter effectively curtails fault currents, reducing fault current interruption by at least 90% compared to existing fault isolation methods. This successful implementation of the coordinated strategy ensures the avoidance of converter station lockouts and guarantees the system’s power supply reliability. © 2024 Power System Technology Press. All rights reserved.

引用

页码：4758 / 4766

页数：8

共 24 条

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