电力系统自动化2024，Vol.48Issue(1)：131-139,9.DOI:10.7500/AEPS20230113002
电流差动保护在海上风电低频送出线路中的适应性分析
Adaptability Analysis of Current Differential Protection in Low-frequency Transmission Lines of Offshore Wind Power
摘要
Abstract
Low-frequency transmission technology has enormous potential for application in the field of medium-and long-distance offshore wind power.Current differential protection is a widely used traditional AC protection,and its performance may be impacted when facing power electronic power sources.Therefore,it is necessary to study its adaptability in offshore wind power low-frequency transmission systems.The paper derives the influence of source characteristics of permanent magnet synchronous generators and modular multilevel matrix converters on fault current based on fault composite sequence networks,and theoretically analyzes the adaptability of current differential protection.To quantitatively analyze the adaptability of protection,a fault electrical quantity calculation method based on improved node equation is proposed,which calculates the fault current and protection criterion values under given fault conditions,and judges the protection operation situation.Research shows that the sensitivity of protection decreases and may even fail to operate during single-phase-to-ground and two-phase short-circuit faults.The protection can operate normally under two-phase-to-ground and three-phase short-circuit faults.Finally,a PSCAD/EMTDC simulation model is established to verify the correctness of the theoretical analysis and calculation methods.关键词
海上风电/低频输电/电流差动保护/保护适应性/直驱风机/模块化多电平矩阵换流器Key words
offshore wind power/low-frequency transmission/current differential protection/protection adaptability/permanent magnet synchronous generator/modular multilevel matrix converter引用本文复制引用
蒋嘉桁,张晨浩,宋国兵,高校平,吕艺超,吴通华..电流差动保护在海上风电低频送出线路中的适应性分析[J].电力系统自动化,2024,48(1):131-139,9.基金项目
国家电网有限公司科技项目(5108-202240278A-2-0-XG). This work is supported by State Grid Corporation of China(No.5108-202240278A-2-0-XG). （5108-202240278A-2-0-XG）
