“嵌入式”对称单极LCC-HVDC系统的直流线路故障暂态优化控制策略  

Optimized DC Fault Transient Control Strategy for Embedded Symmetric Unipolar LCC-HVDC

作　　者：王之伟 凌建 郑俊超 王晨清 孔祥平 刘之涵 冯轩 WANG Zhiwei;LING Jian;ZHENG Junchao;WANG Chenqing;KONG Xiangping;LIU Zhihan;FENG Xuan(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210024,Jiangsu Province,China;State Grid Jiangsu Electric Power Co.,Ltd.,Research Institute,Nanjing 211103,Jiangsu Province,China)

机构地区：[1]国网江苏省电力有限公司,江苏省南京市210024 [2]国网江苏省电力有限公司电力科学研究院,江苏省南京市211103

出　　处：《电网技术》2025年第4期1541-1550,I0060,I0061,共12页Power System Technology

基　　金：国网江苏省电力有限公司科技项目(J2023082)。

摘　　要：常规移相重启策略应用于对称单极结构的常规高压直流输电系统(line commutated converter based high voltage direct current,LCC-HVDC)中存在传输功率中断、无功功率冗余的问题。为减小对称单极LCC-HVDC在清除单极接地故障过程中的功率波动,提出了一种对称单极LCC-HVDC的直流单极接地故障穿越重启策略。穿越重启期间,修改故障极控制策略限制故障电流,非故障极保持正常控制方式传输功率,可减小对称单极LCC-HVDC直流故障清除过程中的功率波动和无功冗余。在此基础上,提出了穿越重启过程中逆变侧换流器的改进换相失败抑制措施,和整流侧换流站谐波抑制策略,提升穿越重启策略的可靠性。基于PSCAD/EMTDC仿真软件搭建了对称单极LCC-HVDC电磁暂态仿真模型,验证了所提方法的有效性和优越性。When adopted in the symmetric unipolar LCC-HVDC,the common phase-shifting restart strategy can lead to problems,including power transmission interruption and reactive power redundancy.To decrease the power fluctuation of the symmetric unipolar LCC-HVDC during the fault clearing,a unipolar grounding fault ride-through and restart strategy is proposed.During the ride-through and restart process,the faulted line’s control strategy is changed to limit the fault current,while the line without fault maintains the original control strategy to maintain power transmission.With the proposed strategy,the power fluctuation and reactive power redundancy are decreased.Further,optimized methods for suppressing the commutation failure and the rectifier station’s harmonics are proposed to improve the reliability of the proposed strategy.Electromagnetic simulation of the symmetric unipolar LCC-HVDC is performed based on PSCAD/EMTDC to verify the effectiveness of the proposed method.

关 键 词：高压直流输电 对称单极 故障穿越 换相失败 

分 类 号：TM721[电气工程—电力系统及自动化]