Adaptive directional current protection scheme based on steady state component in distribution network with DG

被引：0
|
作者：
Ma J. [1 ]
Liu J. [1 ]
机构：
[1] School of Electrical and Electronic Engineering, North China Electric Power University, Beijing
来源：
| 2018年 / Electric Power Automation Equipment Press卷 / 38期
基金：
中国国家自然科学基金;
关键词：
Adaptive directional current protection; Distributed power generation; Distribution network; Relay protection; Short circuit currents; Steady state component;
D O I：
10.16081/j.issn.1006-6047.2018.01.001
中图分类号：
学科分类号：
摘要：
Aiming at the poor reliability problem of traditional protection in the distribution network with DG(Distributed Generation), an adaptive directional current protection scheme based on steady state component is proposed. By analyzing the fault transient characteristics and fault equivalent methods of different kinds of DG, components of short circuit current are calculated, and the relationship between three phase components of the short circuit current are revealed. Based on this, the steady state component of system is obtained according to the fault boundary conditions. Then, combined with the measured voltage and current at the relay installation point, the equivalent voltage and the equivalent impedance at backside of relay protection are calculated, with which, an adaptive directional current protection criterion under different fault conditions is established. Simulative results show that immune to DG types, DG output and system operating modes, the proposed scheme can effectively prevent the time relay failure caused by voltage drop. © 2018, Electric Power Automation Equipment Press. All right reserved.
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页码：1 / 9
页数：8
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