A Method for Identifying Critical Sections of Power Systems Based on Cut Sets of Initial Fault Lines

Abstract

The invention discloses an electric power system key section identification method based on an initial fault line cut set and especially relates to the electric power system fault detection technologyfield. The method is characterized by through defining the structural index of the cut set, an outage probability index and the percentage index of loss of load as a risk assessment index, using a direct current trend model to determine the initial load of each component and determining the cut point of a network; then, blocking a network topology map and disconnecting a determined initial faultline, and recalculating a trend; and searching the first K shortest paths which are seriously affected by initial fault line trend transfer in a same block, searching the cut set of the system based on the initial fault line in the first K shortest paths, calculating the risk assessment index value of the cut set and carrying out risk assessment on the cut set to accurately identify a key transmission section. The method can be realized without complex fault data processing. Compared with other electric power system key section method, the method of the invention is simple, rapid and is easy to realize.

Description

technical field [0001] The invention relates to the technical field of power system fault detection, in particular to a method for identifying key sections of a power system based on initial fault line cut sets. Background technique [0002] With the increasing scale of the power grid, it has become an inevitable trend to use the transmission section instead of a single component to analyze and control the power grid. Especially with the rapid construction of UHV, power grids in different regions are interconnected to form a large power grid. At this time, the probability of large-scale power outages in the power grid is gradually increasing, and the scope of power outages is becoming wider and wider, and the degree of impact is getting higher and higher. Therefore, accurately judging the key monitoring of the key transmission section of the power grid, and taking effective control measures in time can effectively prevent the occurrence of cascading failures in the power sy...

AI Technical Summary

Problems solved by technology

[0003] The research on searching key transmission sections based on power flow transfer failed to comprehensively consider the real-time operation status of the power grid and the impact of line faults on the system, and did not pay attention to the key lines that decouple the system in the power flow transfer path; the passive solution based on the prevention system The research on the key transmission sections listed in the list has a large calculation dimension, and effective measures cannot be taken according to the continuous operation status of the power grid, and at the same time lead to unnecessary machine and load shedding; the research on the key transmission sections based on the grid partition cannot be searched in the area, resulting in The problem of missed selection in the area is the biggest obstacle to the widespread application of the zoning method; based on the research of key transmission sections of key lines, only a group of key transmission sections can be found, and the grid power flow needs to be constantly recalculated, which is cumbersome to calculate

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