摘要
交直流混合微电网中存在的分布式电源含有大量的电力电子器件,与配电网相连时,将会改变微电网的拓扑结构和潮流方向,传统的差动保护已经很难满足其保护的可靠性与速断性要求。因此,提出一种交直流相互配合的改进型差动保护方案。该方案通过分析交流母线电流变化率的大小,同时与直流侧相互配合确定保护动作区域,进而准确迅速的切除故障区域。仿真结果表明,该方案提高了交流系统保护与直流系统保护的相互配合,对交直流混合微电网的稳定运行具有重要意义。
a large number of power electronic devices of distributed generator are contained in hybrid AC/DC micro-grid,the topology and trend of the micro-grid will be changed when it is connected to the distribution network,therefore,it is challengable for the traditional differential protection to satisfy the requirements of reliability and quick breaking.Thus,an improved differential protection scheme based on AC/DC mutual coordination was proposed.At first,the current change rate of AC bus was analyzed and the protected action area was determined at the same time through the coordination with the DC side,then the fault area can be removed accurately and quickly.The simulation results show that the proposed scheme has strengthened the mutual coordination of AC/DC system protection,which is of great significance to the stable operation of hybrid AC/DC micro-grid.
作者
马立群
刘立群
张聪明
白薇
MA Li-qun;LIU Li-qun;ZHANG Cong-ming;BAI Wei(College of Electronic and Information Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《太原科技大学学报》
2019年第1期25-29,共5页
Journal of Taiyuan University of Science and Technology
基金
山西省应用基础研究项目(201601D011058)
煤矿电气设备与智能控制山西省重点实验室开放课题(MEI201603)
关键词
交直流混合微电网
差动保护
电流变化率
可靠性和速断性
Hybrid AC/DC grid
differential protection
current change rate
reliability and quick breaking
