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首页> 外文期刊>International Journal of Electrical Power & Energy Systems >Travelling-wave-based fault location algorithm for hybrid transmission lines using three-dimensional absolute grey incidence degree
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Travelling-wave-based fault location algorithm for hybrid transmission lines using three-dimensional absolute grey incidence degree

机译：基于三维绝对灰色关联度的混合线路输电线路行波故障定位算法

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摘要

The travelling wave propagation velocities in hybrid transmission lines vary, and the initial travelling wave front and its reflection wave fronts are difficult to distinguish; thus, the traditional travelling-wave-based fault location algorithm for single overhead lines is not suitable. Meanwhile, the faults at submarine cables are random and the weather conditions at sea are variable, which makes the maintenance of these cables extremely difficult. Accurate fault location for submarine cables is important in hybrid transmission lines. A novel travelling wave representation in 3D subspace, called a full waveform, is presented. Based on the transmission characteristics and the refraction and reflection mechanism of the travelling wave, the correlation and difference of the full waveform at different fault points are qualitatively and quantitatively analysed using the three-dimensional absolute grey incidence degree. The one-to-one correspondence relationship between fault locations and single-end measured full waveforms is revealed. On this basis, a single-ended travelling-wave-based fault location algorithm used in hybrid transmission lines is proposed. The proposed algorithm is utilised for a multi-scale travelling wave panoramic waveform, which has a clear physical meaning. There is no need to use the modal component velocities, the initial travelling wave front arrival times, or their subsequent reflection waveforms. The proposed algorithm can be used in multi-section hybrid transmission lines. Transient simulation and postfault analysis are conducted using PSCAD/EMTDC and MATLAB, respectively. The accuracy, limitation, and capability of the proposed algorithm are presented and discussed for different fault conditions.
机译：混合传输线中的行波传播速度各不相同，初始行波前及其反射波前难以区分。因此，传统的单行架空行波故障定位算法是不合适的。同时，海底电缆的故障是随机的，海上的天气条件是可变的，这使得这些电缆的维护极为困难。海底电缆的准确故障定位在混合传输线中很重要。提出了一种新颖的3D子空间行波表示形式，称为全波形。根据行波的传输特性和折射和反射机理，利用三维绝对灰度入射角定性和定量地分析了不同故障点全波形的相关性和差异。揭示了故障位置与单端实测全波形之间的一一对应关系。在此基础上，提出了一种用于混合传输线的单端行波故障定位算法。该算法用于多尺度行波全景波形，具有明显的物理意义。无需使用模态分量速度，初始行波前到达时间或其后续反射波形。所提出的算法可以用于多段混合输电线路。分别使用PSCAD / EMTDC和MATLAB进行瞬态仿真和故障后分析。提出并讨论了该算法在不同故障条件下的准确性，局限性和能力。

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