摘要
在实际工程和仿真研究中发现,交流故障切除时存在直流输电换相失败的情况,恶化系统的恢复性能,严重时甚至引发直流闭锁。对此,首先分析了交流故障切除时换相失败的发生机理,得出换相电压相位前移和直流电流水平较高是引起换相失败的主要因素;接着在此基础上研究了交流故障及故障持续时间对此换相失败的影响规律;最后根据换相面积的评估计算,提出了一种抑制故障切除时换相失败的改进策略,并基于CIGRE HVDC标准测试模型进行仿真,仿真结果表明所提策略可有效地抑制故障切除时换相失败的发生。研究结论可为故障切除时换相失败的抑制策略提供思路。
In actual engineering and simulation research,it is found that the DC commutation failures may occur when the AC fault is removed,which worsens the recovery performance of the system,and even leads to DC blocking in serious cases.Firstly,the mechanism of commutation failure during AC fault removal is analyzed,and it is concluded that the forward shift of commutation voltage and high DC current are the main factors causing the commutation failure.Then,on this basis,the influence law of AC fault and fault duration on this commutation failure is studied;Finally,according to the evaluation of commutation voltage area,an improved strategy to suppress commutation failure at fault removal moment is proposed,and the simulation is carried out based on CIGRE HVDC standard model.The simulation results show that the proposed strategy can effectively suppress the occurrence of commutation failure during fault removal.The research conclusion can provide ideas for the suppression strategy of commutation failure at fault removal moment.
作者
李晓华
张靖宜
王玉麟
李书勇
汪娟娟
LI Xiaohua;ZHANG Jingyi;WANG Yuling;LI Shuyong;WANG Juanjuan(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Electric Power Research Institute,CSG,Guangzhou 510663,China)
出处
《南方电网技术》
CSCD
北大核心
2022年第9期1-7,共7页
Southern Power System Technology
基金
国家自然科学基金委员会-国家电网公司智能电网联合基金项目(U1766213)
国家自然科学基金(51677073)。
关键词
高压直流输电
故障切除
换相失败
抑制策略
HVDC transmission
fault removal
commutation failure
suppression strategy
