基于序分量的多端线路电流差动保护改进算法  

The improved algorithm of multi-terminal line current differential protection based on sequential component

作　　者：秦瑞敏[1] 夏经德[1] 罗金玉[1] 钱慧芳[1] 袁玉宝 刘欢庆 QIN Ruimin;XIA Jingde;LUO Jinyu;QIAN Huifang;YUAN Yubao;LIU Huanqing(School of Electronics and Information,Xi′an Polytechnic University,Xi′an 710048,China)

机构地区：[1]西安工程大学电子信息学院,陕西西安710048

出　　处：《西安工程大学学报》2018年第1期83-90,共8页Journal of Xi’an Polytechnic University

基　　金：国家自然科学基金资助项目(51777166)

摘　　要：针对现有多端线路差动保护算法易受饱和等问题的影响,给出一种基于对称分量的多端线路差动保护算法.该算法根据附加正序网络,以各端序电流故障分量和为动作量,以任意两端最大序电压故障分量差与其对应的线路正序阻抗的比值为制动量.分析表明,该算法简单方便,能够可靠区分出故障发生在区内还是区外,并且不受过渡电阻和电流互感器饱和的影响,具有良好的工程应用前景.Because the multiterminal line differential protection algorithm is easily affected by saturation,a algorithm based on symmetrical components is put forward.Based on additional positive sequence network,the algorithm is calculated with-each side sequence current fault component as the action,with any difference on both ends of the largest sequence voltage fault component and on the corresponding line of positive sequence impedance for braking.It shows that the algorithm is simple and can reliably distinguish fault occurred in the area or zone.And the protection algorithm is not affected by fault resistance and current transformer saturation,which has a good prospect of engineering application.

关 键 词：故障分量 正序网络 差动保护 多端线路 电流互感器饱和 

分 类 号：TM73[电气工程—电力系统及自动化]