电网技术2016，Vol.40Issue(3)：719-724,6.DOI:10.13335/j.1000-3673.pst.2016.03.009
适用于直流配电网的测距式保护
Fault Distance Estimation-Based Protection for DC Distribution Networks
摘要
Abstract
A protection algorithm is proposed to guarantee reliability of DC distribution networks based on voltage sourced converter (VSC).Overviews of DC distribution topology and fault characteristics are presented.Feasibility of R-L model algorithm for DC distribution networks is analyzed.To decrease errors and increase numerical stabilities,a new variable acquisition method and a new fault distance estimation formula are proposed.Simulation results verify feasibility of the proposed protection.Its operation time is less than 20 ms and distance estimation error is within 1％.External faults can also be reliably distinguished.The proposed protection meets requirements of speed and selectivity with lower sampling frequency.关键词
测距式保护/R-L模型算法/直流配电网/电压源换流器/变量获取方法/数值稳定性Key words
fault distance estimation-based protection/R-L model/DC distribution network/voltage sourced converter/variable acquisition method/numerical stability分类
信息技术与安全科学引用本文复制引用
李猛,贾科,毕天姝,杨国生,刘宇,杨奇逊..适用于直流配电网的测距式保护[J].电网技术,2016,40(3):719-724,6.基金项目
国家重点基础研究发展计划项目(973 项目)(2012CB215206) （973 项目）
国家自然科学基金项目(51407067,51222703).高等学校学科创新引智计划资助(B08013).Project Supported by National Basic Research Program of China (973 Program) (2012CB215206) （51407067,51222703）
National Natural Science Foundation of China (NSFC)(51407067,51222703) （NSFC）
the "111" Project of China (B08013). （B08013）
