中国电机工程学报2024，Vol.44Issue(7)：2616-2627,后插9,13.DOI:10.13334/j.0258-8013.pcsee.222041
基于故障行波差异性的柔性直流输电线路纵联保护
Pilot Protection for Flexible HVDC Transmission Lines Based on the Difference of Fault Traveling Waves
摘要
Abstract
Flexible HVDC transmission is of great significance to solve the problem of long-distance consumption of large-scale new energy,and its traveling wave protection is the key to ensuring system safety.However,the existing traveling wave amplitude comparison protection is not rigorous in analyzing the relationship on traveling wave amplitude,and the traveling wave reflection relationship is only valid in the complex frequency domain.If this relationship is extended to the time domain,it may affect the protection action performance and bury hidden dangers for the system safety.To solve this problem,this paper first theoretically analyzes the shortcomings of the existing traveling wave amplitude comparison protection,and verifies the time period when the amplitude of the forward traveling wave is greater than that of the backward traveling wave.In order to reveal the difference of traveling waves,the polarity of voltage backward traveling wave and current traveling wave is quantitatively analyzed,and then a voltage traveling wave fault identification criterion using multi-point mean is proposed.A large number of simulation results indicate that the proposed protection is not affected by the fault resistance,and it can quickly and reliably discriminate internal fault from external faults,as well as has strong sensitivity and anti-interference ability.关键词
柔性直流输电/行波差异性/多点均值/纵联保护Key words
flexible HVDC transmission/difference of traveling wave/multipoint average/pilot protection分类
信息技术与安全科学引用本文复制引用
贾科,姚昆鹏,刘子奕,陈淼,李再男,毕天姝..基于故障行波差异性的柔性直流输电线路纵联保护[J].中国电机工程学报,2024,44(7):2616-2627,后插9,13.基金项目
国家自然科学基金(面上项目)(51777071).Project Supported by National Natural Science Foundation of China(General Program)(51777071). （面上项目）
