Branch coefficient calculation method for setting calculation of power system

Abstract

The invention discloses a branch coefficient calculation method for the setting calculation of a power system, and the method can achieve the simplified calculation of a branch coefficient, and greatly improves the working efficiency of the setting calculation. The method comprises the steps: (I) taking the setting and protection of a circuit as a research object, taking the setting and protection of a back bus as a start point, taking the setting and protection of opposite side buses as an end point, and taking the direction from the start point to the end point as the forwarding direction for topological search; (II) defining a number of stages as M, wherein M is a positive integer; taking a condition that a searching stage number is less than or equal to M as a constraint condition, and enabling all searched loops, through which the end point can be found from the start point in the forwarding direction, to be defined as basic loops; (III) enabling a branch in the basic loops to serve as an N-k turn inspection set for maintenance, and calculating a branch coefficient at a current maintenance mode; (IV) calculating all branch coefficients at N-k modes, and screening out an extreme value as a basic parameter for the setting calculation application.

Description

technical field [0001] The invention belongs to the technical field of power system setting calculation, and in particular relates to a branch coefficient calculation method for power system setting calculation. Background technique [0002] In the setting calculation of relay protection setting, in order to satisfy the selectivity of relay protection, it is necessary to consider the backup protection coordination under various operation modes of the power grid. Calculate the branch coefficient, select the extreme value for the setting and coordination of the fixed value. Therefore, the difficulty of calculating the branch coefficient lies in the consideration of various operating modes. The traditional branch coefficient calculation considers the protection of the outgoing line of the opposite side busbar for N-1 round inspection or N-k (k= 1,2,3...) round-robin inspection, a large number of maintenance methods lead to low computing efficiency and a large amount of data re...

AI Technical Summary

Problems solved by technology

Therefore, the difficulty of calculating the branching coefficient lies in the consideration of various operating modes. The traditional branching coefficient calculation considers the protection of the outgoing line of the opposite side bus for N-1 round inspection or N-k (k= 1, 2, 3…) round inspection, a large number of inspection methods lead to low calculation efficiency and a large amount of data redundancy, and the simple contralateral N-1 method may miss extreme operation methods, resulting in branching coefficients that are not extremum

[0003] To sum up, the calculation of branch coefficients in relay protection setting calculation is a large-scale fault calculation problem, and its calculation speed and the correct judgment of branch maintenance methods restrict the efficiency of setting value setting calculation work

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