High-speed direction protection of flexible DC system based on voltage source converter

被引：0
|
作者：
Li B. [1 ]
Qiu H. [1 ]
Hong C. [2 ]
Zhang Y. [2 ]
Yang J. [2 ]
机构：
[1] Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin
[2] Electric Power Research Institute of CSG, Guangzhou
来源：
| 2018年 / Electric Power Automation Equipment Press卷 / 38期
关键词：
Correlation; DC distribution system; Directional criterion; Pilot protection; Voltage source converter;
D O I：
10.16081/j.issn.1006-6047.2018.02.001
中图分类号：
学科分类号：
摘要：
When faults occur in the VSC(Voltage Source Converter)-based DC distribution system, the fault currents have fast speed and high peak value, which require high quickness and reliability of protection. Aiming at the typical meshed VSC-based DC distribution system, the discriminative features between positive and reverse direction fault of protection are analyzed. On this basis, a new fast direction protection principle of DC lines is proposed, by extracting correlation characteristics of DC side parallel capacitor voltage and line current with the positive and reverse direction faults of protection. The principle has the characteristics of fast action speed, high selectivity and strong resistance to transition resistance. A four-terminal meshed DC distribution system is built in PSCAD, whose simulation examples verify the feasibility and superiority of the proposed protection principle. © 2018, Electric Power Automation Equipment Press. All right reserved.
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页码：1 / 8
页数：7
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