Open AccessOptimisation‐based algorithm for constructing first zone of distance protection for flexible power lines
Author(s) -
Davydova Nadezhda,
Shchetinin Dmitry,
Hug Gabriela
Publication year - 2020
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2019.1765
Subject(s) - compensation (psychology) , algorithm , computer science , grid , matlab , electric power transmission , fault (geology) , power grid , range (aeronautics) , line (geometry) , power (physics) , engineering , mathematics , electrical engineering , geometry , quantum mechanics , aerospace engineering , seismology , geology , psychoanalysis , operating system , psychology , physics
The conventional first zone characteristic of distance protection is constructed mainly based on engineering experience, which limits its coverage of internal faults. The zone coverage is also adversely affected by the installation of series compensation devices with over‐voltage protection. Despite research efforts to overcome these problems, developing an algorithm for constructing an optimal first zone characteristic that encloses only all separable internal faults remains a challenging task. This study addresses this issue by presenting an optimisation‐based algorithm for constructing an adaptive optimal first zone characteristic for power lines. The algorithm takes into account different locations of the compensation devices along the line, their non‐linear protection, and the inaccuracies in measurements and considered grid model. The proposed and conventional zone construction algorithms are compared using a grid model in MATLAB Simulink. The results demonstrate that the proposed algorithm is robust to input parameters and thus able to construct an optimal zone characteristic for a specified range of grid operating points and fault parameters. Moreover, the first zone obtained by the proposed algorithm covers substantially more internal faults than the conventional zone with optimised settings.