Fault characteristic analysis and line protection research of independent microgrid

被引：0
|
作者：
Dai M. [1 ]
Jia K. [1 ]
Fang Y. [1 ]
Yang Z. [1 ]
Bi T. [1 ]
Zhang C. [2 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing
[2] Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2019年 / 39卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Equivalent positive-sequence fault component impedance; Fault component based directional relay; Microgrid; Relay protection;
D O I：
10.16081/j.issn.1006-6047.2019.04.020
中图分类号：
学科分类号：
摘要：
Since differences of fault characteristic between converter-interfaced source and traditional generator and topology of distributed access of converter-interfaced source, it is difficult for traditional distribution network protection to act quickly and reliably. The analytical expressions of equivalent positive-sequence fault component impedance of different power source branches in independent microgrid are deduced, the variation rules of impedance angle of equivalent positive sequence fault component under influences of load conditions before fault, output current amplitude after fault and external equivalent impedance with different control strategies are analyzed, and the action performance difference of positive-sequence fault directional elements at different locations in microgrid is analyzed. On this basis, a fault direction judgment method is proposed based on phase comparison between positive-sequence fault component current and the distributed PV(PhotoVoltaic) current before fault. The start-up logic is constructed by using increments of PV branch current and PV power reference value to form a locking-type protection scheme, which is able to remove lines of all types of fault in a minimum range. The correctness of the proposed scheme is verified by results of PSCAD/EMTDC simulation. © 2019, Electric Power Automation Equipment Press. All right reserved.
引用
收藏
页码：133 / 140
页数：7
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