文章摘要
贾科,冯涛,赵其娟,等.基于单端暂态电流和差比的柔性直流配电系统断线保护[J].电力系统自动化,2019,43(8):150-157. DOI: 10.7500/AEPS20180318004.
JIA Ke,FENG Tao,ZHAO Qijuan, et al.Line Breakage Fault Protection Based on Ratio Between Sum and Difference of Single-ended Transient Current for Flexible DC Distribution Systems[J].Automation of Electric Power Systems,2019,43(8):150-157. DOI: 10.7500/AEPS20180318004.
基于单端暂态电流和差比的柔性直流配电系统断线保护
Line Breakage Fault Protection Based on Ratio Between Sum and Difference of Single-ended Transient Current for Flexible DC Distribution Systems
DOI:10.7500/AEPS20180318004
关键词: 断线保护  直流配电系统  故障特性  暂态电流  闭环运行
KeyWords: line breakage fault protection  DC distribution system  fault characteristics  transient current  closed-loop operation
上网日期:2019-03-21
基金项目:国家重点研发计划资助项目(2018YFB0904104);国家自然科学基金资助项目(51407067);国家电网公司科技项目(5205A0160002)
作者单位E-mail
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 ke.jia@ncepu.edu.cn 
冯涛 新能源电力系统国家重点实验室(华北电力大学), 北京市 102206  
赵其娟 新能源电力系统国家重点实验室(华北电力大学), 北京市 102206  
王聪博 新能源电力系统国家重点实验室(华北电力大学), 北京市 102206  
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  
刘海军 先进输电技术国家重点实验室(全球能源互联网研究院有限公司), 北京市 102211  
摘要:
      直流配电系统单极断线故障特征不明显,现有的单极断线保护依赖单一电气量量测,难以通过定值整定准确可靠地识别故障线路。文中提出一种基于单端正负极电流和差比的新型断线保护。通过分析四端直流配电系统开环与闭环运行模式下单极断线的故障机理,得出单极断线故障下故障极与非故障极线路电流的变化差异,进一步利用两者线路电流的和与差作商放大故障极与非故障极的差异,达到可靠识别故障极线路的目的。所提保护原理简单,计算量小,避免了定值无法整定的问题,基于本地测量信息即可实现快速故障识别与选极。最后,通过仿真验证了该方法的可靠性。
Abstract:
      The characteristics of line breakage fault in DC distribution system are not distinctive compared with normal operation. The existing line breakage protections which rely on the single-terminal electrical quantity is difficult to identify the faulty line accurately and reliably. This paper proposes a novel protection method for line breakage fault based on ratios between sum and difference of single-ended positive and negative currents. By analyzing the characteristics of line breakage fault in open-loop and closed-loop operation modes of a four-terminal DC distribution system, the differences of line currents between fault pole and non-fault pole can be obtained when line breakage fault occurs. The differences between fault pole and non-fault pole are amplified by the ratios between sum and difference of the line currents to identify the fault pole reliably. The proposed protection principle is simple, straightforward and can avoid the setting calculation problem. In addition, fault identification and pole selection can be achieved quickly based on local measurement information. Finally, the reliability of the proposed method is verified by simulation results.
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