电力系统保护与控制2025，Vol.53Issue(9)：141-153,13.DOI:10.19783/j.cnki.pspc.240404
基于波速度比例因子的混合多端直流输电线路故障测距方法
Fault location method for hybrid multi-terminal DC transmission lines based on wave velocity scale factor
摘要
Abstract
Aiming at the issues of existing traveling wave location methods,such as high sensitivity to wave velocity,poor resistance to synchronization errors,difficulty in calibrating the wave head of reflected waves,and poor adaptability in multi-terminal HVDC systems,a fault location method for hybrid multi-terminal HVDC lines based on the wave velocity scale factor is proposed.First,the variation characteristics of wave velocity along the line are analyzed.By leveraging the fact that the wave velocities of different modulus at the same measuring point exhibit the same trend but different rates of wave velocity variation,a wave velocity scale factor which can indirectly reflect the fault distance is defined.Second,the fitting curve and calculation curve between the scale factor and the fault distance are solved by interpolation fitting and quantitative derivation,respectively.Based on the monotone difference of the above curves,a fault location scheme is proposed to solve the fault distance with parallel curves.To accurately identify the fault traveling wave head,a wave head calibration method combining robust local mean decomposition and multi-resolution singular value decomposition is proposed.Based on the calibration results,a time-delay-based criterion is designed for identifying the fault branch.Finally,simulation results show that the proposed location method has high accuracy,low computational complexity,immunity to synchronization error,strong resistance to transition resistance(500 Ω)and noise(20 dB),and excellent adaptability across different transmission lines.关键词
混合多端直流输电系统/故障测距/波速度变化特性/行波波头标定/插值拟合Key words
hybrid multi-terminal high voltage direct current system/fault location/wave velocity variation characteristics/traveling wave head calibration/interpolation fitting引用本文复制引用
戴志辉,奚潇睿,李杭泽,牛宝仪..基于波速度比例因子的混合多端直流输电线路故障测距方法[J].电力系统保护与控制,2025,53(9):141-153,13.基金项目
河北省自然科学基金项目资助(E2024502043)This work is supported by the Natural Science Foundation of Hebei Province(No.E2024502043). （E2024502043）
