A Fault Location Algorithm Based on Picking out Outliers for HVDC Transmission Lines

doi:10.3969/j.issn.1000-7229.2015.12.014

Abstract

Abstract:

Aiming at the problem that the existing time-domain fault location algorithms used precise line model and fixed data window, this paper proposed a time-domain fault location algorithm based on picking out outliers. According to the characteristic that the voltage distributions obtained at both ends had minimum difference at the fault point, the proposed algorithm made full use of the post-fault transient data, and obtained the fault positioning results through fault location function when translating the redundant data window. Taking the positioning results as dataset, the distanced-based method in statistics was adopted to pick out the outliers of the dataset, thus the final fault location result could be obtained. The Yunnan-Guangdong ±800 kV bipolar DC transmission system model was established in PSCAD/EMTDC to verify the proposed algorithm. The results show that the proposed algorithm is simple in principle, can realize accurate fault location within the scope of whole length of line, make full use of post-fault transient data, and effectively improve the accuracy and reliability of fault location.

Key words: DC transmission line, fault location, redundant data window, outliers picking out

CLC Number:

QIU Yingdan, LI Haifeng, GUO Lüxing, LIANG Yuansheng, WANG Xiaoli, LUO Meiling. A Fault Location Algorithm Based on Picking out Outliers for HVDC Transmission Lines[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(12): 91-96.

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