送端交流系统故障引起换相失败的影响因素及抑制方案  

The Influencing Factors and Suppression Schemes of Commutation Failure Caused by AC Fault at the Sending Side of HVDC System

作　　者：黄凡 郝亮亮[1] 朱海 陈争光 和敬涵[1] HUANG Fan;HAO Liangliang;ZHU Hai;CHEN Zhengguang;HE Jinghan(School of Electrical Engineering,Beijing Jiaotong University,Haidian District,Beijing 100044,China;State Grid JianHu Power Supply Company,Yancheng 224700,Jiangsu Province,China;State Grid Corporation of China,Xicheng District,Beijing 100031,China)

机构地区：[1]北京交通大学电气工程学院,北京市海淀区100044 [2]国家电网建湖供电公司,江苏省盐城市224700 [3]国家电网有限公司,北京市西城区100031

出　　处：《电网技术》2025年第3期1137-1146,I0080,I0081,共12页Power System Technology

基　　金：国家自然科学基金国网联合基金项目(U2066210)。

摘　　要：为降低高压直流输电系统送端交流故障引起受端发生换相失败的风险,首先对此类换相失败的影响因素进行分析,重点研究了故障时受端电压相位前移对关断裕度及触发偏差的影响,并考虑故障恢复期间逆变侧所处的控制模式,分析了直流电流突增对换相失败的影响。然后,针对上述影响因素及机理,构建了包括多重抑制策略及参数选取在内的整套抑制方案。该方案对受端换流母线相位前移量进行预测,基于预测量确定触发指令临界值,并对相位前移带来的触发偏差进行修正实现逆变器触发指令的动态调整。同时在整流侧增加电流改进控制策略,以解决恢复期间因控制策略响应速度不同导致的直流电流突增,使系统快速平稳地恢复至额定运行,进一步降低换相失败风险。最后,基于CIGRE标准测试系统进行仿真对比验证,结果表明提出的抑制方案能够有效抑制送端交流故障引起的换相失败。To reduce the risk of commutation failures(CFs)at the receiving end caused by AC faults at the sending end of the high voltage direct current(HVDC)transmission system,the influencing factors of such CFs are first analyzed,with a focus on studying the impact of the phase shift of the receiving end voltage on the switching margin and triggering deviation during faults.Considering the control mode of the inverter side during fault recovery,the impact of the sudden increase in DC on CFs is analyzed.Then,a complete suppression scheme,including multiple suppression strategies and parameter selection,is constructed based on the aforementioned influencing factors and mechanisms.This scheme predicts the phase shift of the commutation bus at the receiving end,determines the critical value of the trigger command based on the predicted amount,and corrects the trigger deviation caused by the phase shift to achieve dynamic adjustment of the inverter trigger command.At the same time,the current control strategy on the rectifier side is improved to address the sudden increase in DC caused by different response speeds of the control strategy during recovery,enabling the system to recover quickly and smoothly,further reducing the risk of CFs.Finally,simulation and comparison verification are conducted based on the CIGRE standard testing system,and the results show that the proposed suppression scheme can effectively suppress commutation failure caused by AC faults at the sending end.

关 键 词：送端交流系统故障 换相失败 相位前移 突增的直流电流 抑制方案 

分 类 号：TM721[电气工程—电力系统及自动化]