电力系统保护与控制2026，Vol.54Issue(11)：14-25,12.DOI:10.19783/j.cnki.pspc.260041
基于暂态电压瞬时频率的柔性直流电网线路故障保护方案
Flexible DC grid line fault protection scheme based on instantaneous frequency of transient voltage
摘要
Abstract
To address the issues of existing line boundary protection schemes,which are easily affected by transition resistance and lack effective parameter setting criteria,a flexible DC power grid line fault protection scheme based on the instantaneous frequency of transient voltage is proposed.First,an improved transient voltage gradient is used as the fault activation criterion.Then,the differences in transient voltage instantaneous frequency between the bus-side and the line-side of current-limiting reactors at both ends of the line under internal and external faults are analyzed.Singular value decomposition(SVD)is used to process the transient voltage signal.The instantaneous frequency(IF)is extracted from the first-level component obtained by the decomposition using the discrete energy separation algorithm(DESA),and a criterion for the internal/external fault is constructed based on the polarity of the integral difference.Finally,fault pole selection is realized according to the strength of the singularity of the second-layer component.Simulation results demonstrate that the proposed scheme can effectively identify fault zones,has strong resistance to transition resistance,and is robust against noise,current-limiting reactor size variations,line length changes,sampling frequency variations,and data synchronization errors.关键词
边界保护/暂态电压/瞬时频率/奇异值分解/离散能量分离算法/奇异性Key words
boundary protection/transient voltage/instantaneous frequency/singular value decomposition/discrete energy separation algorithm/singularity引用本文复制引用
张展,侯耀杰,韦延方,曾志辉,王晓卫,刘孟博..基于暂态电压瞬时频率的柔性直流电网线路故障保护方案[J].电力系统保护与控制,2026,54(11):14-25,12.基金项目
This work is supported by the National Natural Science Foundation of China(No.61703144). 国家自然科学基金项目资助(61703144) （No.61703144）
河南省科技攻关项目资助(252102241061) （252102241061）
