Line selection method and device for AC/DC line contact fault, and computer-readable storage medium

Abstract

The invention relates to the technical field of electric power systems, and discloses a line selection method and device for an AC / DC line contact fault, and a storage medium. The method comprises thesteps of: calculating a voltage component, a first current component and a second current component of each busbar in a multi-terminal DC transmission system, wherein the voltage component is a 50Hzcomponent of the voltage of the busbar, the first current component is the 50Hz component of the DC line current flowing into the busbar, and the second current component is the 50Hz component of theDC line current flowing out from the busbar; when the voltage component, the first current component and the second current component meet preset safety conditions, calculating a first power directionand a second power direction of the busbar according to the voltage component, the first current component and the second current component; and determining a DC line in which the AC / DC line contactfault occurs according to the first power direction and the second power direction of the busbar. By adopting the line selection method disclosed by the invention, accurate fault line selection can berealized, the power loss is reduced, and the influence range of the fault is reduced.

Description

technical field [0001] The present invention relates to the technical field of electric power systems, in particular to a line selection method, device and computer-readable storage medium for AC-DC line collision faults. Background technique [0002] At present, the mixed operation of AC and DC systems in my country's power grid, the phenomenon of AC lines and DC lines crossing is relatively common. Especially near the DC converter station, there are many AC and DC incoming and outgoing lines, and the phenomenon of crossover is more common. Moreover, in the case of the same AC and DC transmission routes, it is not ruled out that AC and DC lines share corridors or even be erected on the same tower in the future. This can reduce construction difficulty on the one hand, and save land costs on the other hand. Therefore, the crossover of AC and DC lines will become more and more common, and the problem of AC and DC line touch-line faults must also be paid attention to. [0003...

AI Technical Summary

Problems solved by technology

However, in the process of implementing the present invention, the inventors found that the prior art has at least the following technical problems: After the DC line fault occurs in the multi-terminal DC system, the fault line selection is usually based on the DC component, and the AC-DC line collision occurs. After a fault, due to the inrush of AC components, the fault line selection method based on DC components may fail, so it is still unable to reduce the power loss of the multi-terminal DC system

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