基于MMC主动电压式的HVDC输电线路暂态故障测距方法  

Transient Fault Location Method of HVDC Transmission Lines Based on MMC Active Voltage

作　　者：丁煜蓉 仝凌云 廖家齐 刘咏鑫 DING Yu-rong;TONG Ling-yun;LIAO Jia-qi;LIU Yong-xin(State Grid Jiangsu Electric Power Co.,Ltd.Nanjing Power Supply Branch,Nanjing 210019,China;State Key Laboratory of New Energy and Energy Storage Operation Control,Nanjing 210037,China)

机构地区：[1]国网江苏省电力有限公司南京供电分公司,江苏南京210019 [2]新能源与储能运行控制国家重点实验室,江苏南京210037

出　　处：《电工电气》2023年第11期50-56,共7页Electrotechnics Electric

基　　金：国网江苏省电力有限公司科技项目(J2023011)。

摘　　要：针对模块化多电平柔性高压直流(MMC-HVDC)输电线路的两种不同故障类型提出了一种基于MMC主动电压式的暂态法故障测距方法,该方法利用MMC模块的可控性技术,使两侧MMC在不影响线路正常运行并易于检测的条件下产生主动性电压,对其放电的暂态过程进行分析,通过将两种故障类型的输电线路进行简化,求解二阶暂态方程,得到故障距离。随机选取录波数据点,利用所推导出的两种故障类型的测距表达式进行计算。结论表明单极接地短路故障测距的误差率基本可稳定控制在1.5%以内,而双极短路故障测距在故障点接近线路中段时的误差率可控制在2%以内,验证了该仿真系统的准确性。A transient fault location method based on Modular Multilevel Converter(MMC)active voltage is proposed for two different fault types of MMC-HVDC transmission line.It uses the controllability of the MMC module to generate active voltage on both sides of MMC as the situation does not affect the normal operation of lines and is easy to detect.Then,after analyzing the transient process of discharge,two types of fault lines is simplified to solve the corresponding second-order transient equations to get the fault distance.Third,through randomly selecting recording data points,the derived location expressions of two fault types are used to calculate the location.The error rate of single-pole ground fault location can be controlled within 1.5%,and that of bipolar fault location can be controlled within 2%,which verifies the accuracy of the simulation system.

关 键 词：模块化多电平柔性高压直流 故障测距 暂态法 主动电压 电容放电 

分 类 号：TM72[电气工程—电力系统及自动化]