电力系统保护与控制2025，Vol.53Issue(12)：69-81,13.DOI:10.19783/j.cnki.pspc.240655
适用于双端弱馈交流系统的改进型电流差动保护
Improved current differential protection for two-terminal weak feed AC system
摘要
Abstract
The transmission of renewable energy via flexible DC systems has become an inevitable development trend for large-scale renewable energy grid integration.The associated two-terminal weak feed(TTWF)AC systems are often composed of 100%power electronic equipment.Traditional fault control strategies adopted by the converters at both ends of the line after a fault lead to limited fault currents,thereby reducing the effectiveness of conventional differential protection.Based on the challenges in current differential protection in TTWF AC systems under conventional control strategies,a current differential protection scheme based on negative-sequence control coordination strategy is proposed.First,the fault characteristics of TTWF AC systems are theoretically derived,and a boundary function is presented to quantitatively assess the performance of current differential protection actions.Secondly,the action boundary and sensitivity of current differential protection with the improved fault control coordination strategy are analyzed.Finally,combining the action boundary,sensitivity and adaptive function,an improved current differential protection scheme based on adaptive function is proposed.Simulation results show that the proposed protection scheme can reliably identify faults even under conditions of a 300 Ω fault resistance and 25 dB noise interference.It is well-suited for the protection requirements of TTWF AC systems under various scenarios and demonstrates higher sensitivity.关键词
双端弱馈交流系统/电流差动保护/负序控制策略/自适应校正函数/灵敏度Key words
two-terminal weak feed AC system/current differential protection/negative-sequence control strategy/adaptive correction function/sensitivity引用本文复制引用
高强强,侯俊杰,樊艳芳,宋国兵,曹润彬,李岩,黄伟煌,吴小芳..适用于双端弱馈交流系统的改进型电流差动保护[J].电力系统保护与控制,2025,53(12):69-81,13.基金项目
This work is supported by the National Key Research and Development Program of China(No.2021YFB1507000). 国家重点研发计划项目资助(2021YFB1507000) （No.2021YFB1507000）
南网科研院科技项目资助(SEPRI-K22B055) （SEPRI-K22B055）
新疆维吾尔自治区自然科学基金项目资助(2022D01C662) （2022D01C662）
"天山英才培养"计划项目资助(2022TSYCLJ0019) （2022TSYCLJ0019）
