电测与仪表2024，Vol.61Issue(5)：44-51,8.DOI:10.19753/j.issn1001-1390.2024.05.007
基于改进过压限制器和ACDTS的混联半波长系统故障保护策略
Fault protection strategy for hybrid half-wavelength system based on improved overvoltage limiter and ACDTS
摘要
Abstract
The transient characteristic of AC/DC hybrid half-wavelength transmission system is quite different from conventional hybrid system.When an asymmetric fault occurs along the half-wavelength line of the hybrid system,the DC system will be impacted by power frequency overvoltage and overcurrent along the line.This paper analyzes the propagation process of faults along the half-wavelength line of the hybrid system in detail,and studies the mech-anism of fault propagation coupling.In view of the overvoltage problem on DC side,it is proposed to install an im-proved overvoltage limiter on the DC bus side,add an auxiliary voltage limiting channel to suppress the DC side ov-ervoltage in stages,and reduce the current value of a single channel,which improves the voltage limit level of sys-tem protection.On the other hand,for the overcurrent problem on DC side,it is proposed to connect bidirectional thyristors in parallel at the interface of the converter station to realize the equivalent three-phase short circuit of the AC system,and isolate the fault overcurrent fed by the AC side bus to ensure the safety of converter station equip-ment and lines.Simulations are used to verify the feasibility of the two protection strategies.关键词
混联半波长系统/交流故障/直流系统/改进过压限制器/双向晶闸管Key words
hybrid half-wavelength system/AC fault/DC system/improved over-voltage limiter/double thyristor分类
信息技术与安全科学引用本文复制引用
王华昕,黄兆,王杰,邓祥力..基于改进过压限制器和ACDTS的混联半波长系统故障保护策略[J].电测与仪表,2024,61(5):44-51,8.基金项目
国家自然科学基金资助项目(51777119) （51777119）
国家自然青年基金资助项目(51307104) （51307104）
