Abstract
In order to solve the problem of inaccurate fault location in the transmission network under some abnormal conditions, such as traveling wave location device faults, startup failure and time recording error, a novel traveling wave fault location method based on directed tree model and linear fitting is proposed. A directed tree model of the fault traveling wave transmission along the shortest path is established based on graph theory analysis of traveling wave transmission network. Two straight lines are fitted on the coordinate plane where the accurate fault location is obtained direct by coordinate information of the intersection of these two fitted straight lines (FSLs), according to the transmission characteristics of the fault traveling wave in the directed tree model. The wave velocity is used as the slope of the fitted straight line, and the influence of its uncertainty on the fault location is eliminated. The time record error points of the location device are automatically eliminated in the linear fitting. PSCAD simulation results prove that fault information of the entire transmission network is comprehensively utilized by the proposed method and the ring network is automatically unlooped. The reliability and accuracy of fault location are remarkably improved, particularly for the fault scenarios with recorded information abnormity.
Highlights
With the rapid development of smart grids, the capacity of power systems and the area of power grids are constantly being expanded, resulting in more complicated power grid operation management [1], [2]
A novel traveling wave fault location method based on directed tree model and linear fitting is proposed in this paper
The fitting error points are automatically eliminated through the linear fitting process of the proposed algorithm, which is equivalent to eliminating errors caused by factors such as traveling wave location device faults, startup failure and time recording error
Summary
With the rapid development of smart grids, the capacity of power systems and the area of power grids are constantly being expanded, resulting in more complicated power grid operation management [1], [2]. Distant information with high time accuracy is ignored by this weighting process, and more human factors are introduced To solve these problems, a novel traveling wave fault location method based on directed tree model and linear fitting is proposed in this paper. ANALYSIS OF FITTED STRAIGHT LINES FOR FAULT TRAVELING WAVES The fault initial traveling wave arrival time of each substation recorded in the transmission network is linearly proportional to the transmission distance (linear function form is Y = aX + b), according to the principle of traveling wave transmission. The proposed algorithm is easy to implement and apply in practical power systems, because it is simple and does not require a complicated solution process
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