Method for selecting power exchange connection modes for sub-areas in power grid

Abstract

A method for selecting power exchange connection modes for sub-areas in a power grid comprises steps as follows: A, power grid parameters of a fault sub-area and an adjacent sub-area are acquired; B, power vacancy of the fault sub-area is determined; C, exchange power of all connecting lines in the fault sub-area is determined; D, whether a main transformer down channel of the fault sub-area is broken down is judged, if yes, one connecting line with the highest exchange power is closed to be taken as an exchange connecting channel, and otherwise, a buscouple switch is switched off to be taken as the exchange connecting channel; E, whether the power vacancy of the fault sub-area is met is judged, if yes, a step F is executed, and otherwise, a step G is executed; F, whether the exchange connecting channel is overloaded is judged, if yes, the step G is executed, and otherwise, the connecting way is selected; G, one connecting line is added as the exchange connecting channel, and the step E is executed. According to the method for selecting the power exchange connection modes for the sub-areas in the power grid, the effective power grid sub-area exchange ways can be provided, and the system stability is improved.

Description

technical field [0001] The invention relates to the field of power system operation, in particular to the fault processing technology in the partition operation mode of the power system. Background technique [0002] Driven by the continuous development and improvement of the 500kV grid structure, the urban power grid has gradually formed a network structure in which the main grid is a 500kV ring network and the regional grid is a 220kV grid. At the same time, the 500 / 220kV high and low voltage electromagnetic ring network and the increase of short-circuit current in the 220kV side system have become increasingly prominent with the continuous strengthening of network connections. Therefore, the implementation of the grid partition operation mechanism with 500kV substations as the core should be promoted. . After forming a reasonable partition, the 500 / 220kV electromagnetic ring network that seriously affects the safety and stability of the power grid can be eliminated, the ...

AI Technical Summary

Problems solved by technology

[0003] The divisional operation mode of the 220kV power grid not only brings the aforementioned advantages, but also weakens the accident resistance ability of each division

Unreasonable choice of mutual supply and contact mode will make the power balance demand of the power grid in the accident mode unsatisfactory

However, in the prior art, there is no reasonable selection method for the determination of mutual supply and contact methods, which makes the selection of mutual supply and contact methods diverse and random, which brings hidden dangers to the safe operation of the power grid

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