电网技术2016，Vol.40Issue(1)：283-289,7.DOI:10.13335/j.1000-3673.pst.2016.01.039
高压直流纵差保护动作特性分析及改进
HVDC Longitudinal Differential Protection Operating Characteristic Analysis and Improvement
摘要
Abstract
Traveling-wave protection and under-voltage protection fail to detect the high-impedance ground fault in HVDC line protection,meanwhile the special block logic of line longitudinal differential protection increase the operation time and make it hard to be the back-up protection.Under this condition,pole control protection would act the fault and block the pole.Combined with the examples of Tian-Guang HVDC transmission project and based on the PSCAD/EMTDC simulation platform,the reason of differential protection disoperation is analyzed,in connection with the fault records and the simulation results.Furthermore,this paper proposes several optimizing strategies for the differential protection disoperation problem and designs a criterion to solve it in principle,which uses AC voltage.The simulation results of the actual HVDC transmission project verify the availability of this criterion.关键词
直流线路保护/后备保护/纵差保护/高阻接地故障Key words
HVDC line protection/back-up protection/line longitudinal differential protection/high-impedance ground fault分类
信息技术与安全科学引用本文复制引用
李晓华,戴扬宇,丁晓兵,杨通贇,蔡泽祥..高压直流纵差保护动作特性分析及改进[J].电网技术,2016,40(1):283-289,7.基金项目
国家自然科学基金项目(51377059).Project Supported by the National Science Foundation of China (51377059). （51377059）
