基于行波理论和改进Hausdorff距离的多端混合直流输电线路保护方案  

Protection scheme of multi-terminal hybrid HVDC transmission line based on traveling wave theory and improved Hausdorff distance

作　　者：武一鸣 樊友平[1] 王子江 许洵 黄宗武 李东杰[1] WU Yiming;FAN Youping;WANG Zijiang;XU Xun;HUANG Zongwu;LI Dongjie(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2024年第5期608-618,共11页Engineering Journal of Wuhan University

基　　金：国家重点研发计划项目(编号:2022YFF0610600)。

摘　　要：多端混合直流输电系统输电容量大、拓扑结构复杂,具有“多送点、多受端”的特征,线路容易发生故障且故障后的影响范围广,因此对保护的可靠性要求极高。为保证多端混合直流输电系统安全稳定运行,提出了一种基于行波理论和改进Hausdorff距离的保护方案。根据行波理论测算线模分量与地模分量,并应用输电线路的贝瑞隆模型,由线路一侧的线模分量推演线路对侧线模电流;引入改进的Hausdorff距离算法来量化推演值与真实值的差异并构造判据以识别故障线路,同时根据地模波的大小与变化率确定故障极、根据行波检测时间计算故障位置,实现故障精准定位。采用乌东德三端混合直流输电工程模型,通过PSCAD/EMTDC进行仿真验证,结果表明该保护方案能在5 ms内识别全线范围的故障且能够耐受过渡电阻与噪声干扰,兼具可靠性、选择性、速动性与灵敏性。Multi-terminal hybrid high-voltage direct current(HVDC)transmission systems have large transmission capacity,complex topology structure,and the characteristics of"multiple sending points and multiple receiving ends".The line is prone to faults,and the influence range after the fault is wide,so the reliability of protection is extremely high.To ensure the safe and stable operation of the multi-terminal hybrid DC transmission system,a protection scheme based on traveling wave theory and improved Hausdorff distance is proposed in this paper.The line mode component and ground mode component are calculated according to the traveling wave theory,and the Bergeron model of the transmission line is applied to deduce the line mode current of the opposite side of the line from the line mode component of the line.The improved Hausdorff distance algorithm is introduced to quantify the difference between the deduced value and the real value and to construct the criterion to identify the fault line.At the same time,the fault pole is determined based on the size and change rate of the ground mode wave,and the fault location is calculated according to the traveling wave detection time to achieve an accurate fault location.This paper adopts the Wudongde three-terminal hybrid DC transmission engineering model and conducts simulation through PSCAD/EMTDC.The results show that the proposed protection scheme can identify faults in the whole line within 5 ms,withstand transition resistance and noise interference,and has reliability,selectivity,quickness and sensitivity.

关 键 词：多端混合直流输电 行波理论 贝瑞隆模型 改进HAUSDORFF距离 可靠性 

分 类 号：TM721.3[电气工程—电力系统及自动化]