基于行波瞬时振幅的高压直流输电线路故障测距方法研究

在研究高压直流输电线路行波到达时刻与行波特定瞬时振幅关系的基础上，分析瞬时振幅影响行波测距的机理，提出一种基于瞬时振幅的三端行波故障测距方法。利用希尔伯特黄变换形成故障暂态信号的瞬时振幅一阶微分图，根据瞬时振幅一阶微分图确定行波到达时刻与该时刻特定的瞬时振幅，形成高压直流输电线路故障测距算法。Simulink仿真实验结果表明，该方法与小波变换或行波瞬时频率的定位方法相比，具有更高的定位精度，几乎不受故障距离、故障类型、故障电阻的影响。

Fault Location Method of HVDC Transmission Line Based on Traveling Wave Instantaneous Amplitude

Based on the study of the relationship between the arrival time and specific instantaneous amplitude of traveling wave for HVDC transmission line, the paper analyzes the mechanism of the instantaneous amplitude influencing traveling wave fault location, and proposes a three-terminal traveling wave fault location method based on the instantaneous amplitude. The Hilbert yellow transform is used to form the first-order differential graph of the instantaneous amplitude with fault transient signal, and the arrival time and the specific instantaneous amplitude of the traveling wave is determined according to the first-order differential graph, forming the fault location algorithm of the HVDC transmission line. The Simulink simulation results show that this method has higher positioning accuracy than wavelet transform and traveling wave instantaneous frequency based location method, and is almost not affected by the fault distance, fault type and fault resistance.