电力系统保护与控制2025，Vol.53Issue(20)：1-10,10.DOI:10.19783/j.cnki.pspc.241714
基于频域能量比值的柔性直流输电线路单端量高可靠性保护方案
High-reliability non-unit protection for flexible DC transmission lines based on frequency-domain energy ratio
摘要
Abstract
To address the lack of effective setting criteria for frequency-domain protection of flexible DC transmission lines and to mitigate the protection maloperation issue due to lightning interference,this paper proposes a high-reliability non-unit protection based on frequency-domain energy ratio.First,this paper analyzes the frequency-domain expressions of line-mode voltage traveling waves under four typical conditions in flexible DC transmission systems:internal ground faults,external ground faults,line lightning interference,and lightning faults,revealing their frequency-domain distribution characteristics.Based on this,an energy operator is introduced to weight the voltage backward traveling wave amplitude-frequency curve,enhancing the discrimination of high-frequency components.Then,the energy accumulation ratio across different frequency bands is used to establish a criterion for identifying internal and external faults.Additionally,considering the significant differences in energy distribution in the low-frequency range due to lightning interference,an efficient method for lightning interference identification is proposed.Finally,a complete non-unit protection criterion for DC transmission lines is developed,supported by clear theoretical setting principles.Extensive simulation results validate that the proposed protection can quickly and reliably identify line faults while accurately detecting lightning interference,exhibiting strong tolerance to transition resistance and excellent anti-interference capability.关键词
柔性直流输电系统/直流线路保护/频域保护/能量积聚量/雷击干扰识别Key words
flexible DC transmission system/DC line protection/frequency-domain protection/energy accumulation/lightning interference identification引用本文复制引用
王艳婷,樊顺跃,刘乐,康小宁,石钊源,陈旭明..基于频域能量比值的柔性直流输电线路单端量高可靠性保护方案[J].电力系统保护与控制,2025,53(20):1-10,10.基金项目
This work is supported by the National Natural Science Foundation of China(No.52407142). 国家自然科学基金项目资助(52407142) （No.52407142）
中国博士后科学基金项目资助(2021M690126) （2021M690126）
陕西省科技厅项目资助(2024JC-YBMS-285) （2024JC-YBMS-285）
