电力系统保护与控制2025，Vol.53Issue(4)：1-13,13.DOI:10.19783/j.cnki.pspc.240568
基于相角差余弦值奇异熵的远海风电交流汇集线路单端量保护原理
Single-ended protection principle for offshore wind power AC collection lines based on the singular entropy of the cosine value of phase angle difference
摘要
Abstract
In offshore wind power flexible DC transmission systems,negative sequence suppression control strategy is adopted on both sides of the power electronic equipment.When a fault occurs on the AC collection line,the phase angle and amplitude of the fault current on both sides change significantly,which reduces the reliability of the traditional power frequency based distance protection.To address this issue,the structure of the offshore wind power AC collection system is described first,and the implementation method of the negative sequence suppression strategy is analyzed.Secondly,the adaptability of traditional distance protection is evaluated by considering the capacitive current,and the cosine value of the phase angle difference between the phase current and its leading phase current under different faults is analyzed.Based on this,the Hankel matrix is used to reflect the mutation degree of the characteristic quantities,and a single terminal protection principle for AC collection lines based on the singular entropy of the cosine value of the phase angle difference is proposed.Finally,an offshore wind power system model is built in PSCAD/EMTDC,and the effectiveness of the proposed scheme is verified.The results show that the proposed method is highly sensitive,reliable,and is capable of withstanding 20 dB noise and 100 Ω transition resistance.关键词
采样算法/单端量保护/奇异熵/接地故障/海上风电Key words
sampling algorithm/single-ended protection/singular entropy/grounding fault/offshore wind power引用本文复制引用
戴志辉,韩哲宇,李杭泽..基于相角差余弦值奇异熵的远海风电交流汇集线路单端量保护原理[J].电力系统保护与控制,2025,53(4):1-13,13.基金项目
This work is supported by the National Natural Science Foundation of China(No.51877084). 国家自然科学基金项目资助(51877084) （No.51877084）
