文章摘要
李猛,贾科,张秋芳,等.基于全电流方向特征的柔性直流配电网纵联保护[J].电力系统自动化,2019,43(23):116-122. DOI: 10.7500/AEPS20190319003.
LI Meng,JIA Ke,ZHANG Qiufang, et al.Directional Pilot Protection for Flexible DC Distribution Network Based on Directional Characteristics of Instantaneous Current[J].Automation of Electric Power Systems,2019,43(23):116-122. DOI: 10.7500/AEPS20190319003.
基于全电流方向特征的柔性直流配电网纵联保护
Directional Pilot Protection for Flexible DC Distribution Network Based on Directional Characteristics of Instantaneous Current
DOI:10.7500/AEPS20190319003
关键词: 方向纵联保护  柔性直流配电系统  全电流量  电压源型换流器
KeyWords: directional pilot protection  flexible DC distribution system  instantaneous current value  voltage source converter
上网日期:2019-10-29
基金项目:国家重点研发计划资助项目(2016YFB0900203);国家自然科学基金资助项目(51725702);中央高校基本科研业务费专项资金资助项目(2016ZZD01)
作者单位E-mail
李猛 北京交通大学电气工程学院, 北京市 100044 ke.jia@ncepu.edu.cn 
贾科 新能源电力系统国家重点实验室(华北电力大学), 北京市102206  
张秋芳 北京交通大学电气工程学院, 北京市 100044  
刘颖 国网北京经济技术研究院有限公司, 北京市 102209  
毕天姝 新能源电力系统国家重点实验室(华北电力大学), 北京市102206  
杨奇逊 新能源电力系统国家重点实验室(华北电力大学), 北京市102206  
摘要:
      为保证柔性直流配电网安全可靠运行,提出了一种线路主保护方法。在分析双极短路故障各阶段电流方向特征的基础上,提出了基于全电流方向特征的纵联保护方法,给出了动作判据以及定值整定方法,分析了各种因素对所提保护的影响。保护方法不受电压源型换流器闭锁以及线路分布电容暂态电流的影响。物理实验与仿真结果验证了所提保护方法的可行性,其动作速度快,具有良好的耐受噪声和过渡电阻的能力。所提保护方法能较好地满足柔性直流配电网对保护速动性与选择性的需求。
Abstract:
      A primary line protection method is proposed for the safety and reliable operation of flexible DC distribution network. Based on the analysis of current direction characteristics of bipolar short-circuit faults in each stage, a new directional pilot protection based on instantaneous current direction characteristics is proposed. The action criterion and the setting method of setting value are given, and the influence of various factors on the proposed protection is analyzed. The protection method is not affected by the voltage source converter(VSC)blocking and the transient current of the line distributed capacitance. The physics experiment and simulation results verify the feasibility of the proposed protection method. It has fast action speed and good resistance to noise and transition resistance. The proposed protection could meet the requirements of the flexible DC distribution network for protection quickness and selectivity.
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