电力系统保护与控制2026，Vol.54Issue(12)：44-55,12.DOI:10.19783/j.cnki.pspc.260059
基于改进相对距离偏差系数的海上风电柔性低频送出线路时域纵联保护
Time-domain pilot protection for offshore wind farm flexible low-frequency transmission lines based on an improved relative distance deviation coefficient
摘要
Abstract
The fault response characteristics of offshore flexible low-frequency AC transmission systems differ significantly from those of traditional synchronous generator based power systems,which may cause malfunction of conventional current differential protection.To address this issue,this paper conducts an in-depth analysis of the current curve characteristics formed by the currents at both ends of a flexible low-frequency transmission line,and proposes a relative distance deviation coefficient-based pilot protection(RDDC-PP)method.The proposed method can accurately identify internal faults and exhibits inherent robustness against abnormal data and current transformer(CT)measurement errors.Furthermore,the Lorentz transformation is employed to improve the current trajectories,and an improved relative distance deviation coefficient-based time-domain pilot protection(IRDDC-PP)method is developed.An adaptive parameter α is also designed to enhance the robustness of IRDDC-PP to disturbances such as synchronization errors and Gaussian white noise.The proposed method is validated using a digital-physical co-simulation platform.Simulation results demonstrate that the proposed method operates accurately under various fault resistances,fault locations,fault types,and sampling frequencies.In addition,it exhibits strong robustness against disturbances such as CT measurement errors,abnormal data,noise,and synchronization errors.Compared with existing methods,the proposed approach achieves superior performance in terms of speed,sensitivity,dependability,and security.关键词
柔性低频输电/纵联保护/相对偏差系数/洛伦兹变换Key words
flexible low-frequency AC transmission/pilot protection/relative distance deviation coefficient/Lorentz transformation引用本文复制引用
梁营玉,徐嘉豪,孟志超,杨小洋..基于改进相对距离偏差系数的海上风电柔性低频送出线路时域纵联保护[J].电力系统保护与控制,2026,54(12):44-55,12.基金项目
This work is supported by the National Key Research and Development Program of China(No.2022YFC2904104). 国家重点研发计划项目资助(2022YFC2904104) （No.2022YFC2904104）
中央高校基本科研业务费资助(2026JCCXJD01) （2026JCCXJD01）
