Power grid lightening disaster risk assessment technique method based on fine grid blocks

Abstract

The invention discloses a power grid lightening disaster risk assessment technique method based on fine grid blocks. The power grid lightening disaster risk assessment technique method is used for analyzing vulnerability of the power grid encountered with lightening disaster under the condition that the earth fine grid blocks serve as basic evaluation units. The method comprises the following steps: (1) correlation coefficient of land types and cloud-to-ground lightening density is analyzed and confirmed so as to conduct significance testing according to the land types; (2) correlation coefficient of climate background and the cloud-to-ground lightening density is confirmed so as to conduct significance testing; (3) weight of lightening disaster risk indicators is confirmed by adopting a gray relational degree method; (4) quantization is conducted to the weight of lightening disaster risk indicators; and (5) a power grid lightening disaster risk assessment model is built under the condition that the earth fine grid blocks serve as the basic evaluation units. According to the power grid lightening disaster risk assessment technique method based on the fine grid blocks, a fine space quantization geographic information system (GIS) model of power grid vulnerability in lightening disaster is built, the power grid lightening disaster risk assessment model is proposed, space quantization researching of the power grid vulnerability in lightening disaster is conducted under the condition that the earth fine grid blocks serve as the basic evaluation units, and the power grid lightening disaster risk assessment technique method is wide in application range and high in accuracy.

Description

technical field [0001] The invention relates to the field of disaster risk assessment, in particular to a fine grid-based lightning disaster risk assessment technology method for power grids. Background technique [0002] At present, the assessment method of lightning hazard risk in the power grid is mainly based on the lightning tripping rate as the evaluation index, and a perfect evaluation system has not yet been established. Traditional methods and technologies cannot meet the needs. For example, the Chinese patent literature discloses an invention patent named "Lightning Flashover Risk Assessment Method for Regional Transmission Lines", the authorized announcement number is CN 102156787 B, and the authorized announcement date is December 12, 2012. Yes, including database, shielding risk assessment model, counterattack risk assessment model and risk value synthesis module. The database is used to provide various parameters and parameter values. The shielding risk assess...

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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing power grid lightning disaster risk assessment method can no longer meet the requirements for the fineness of the assessment and the spatial representation, and provides a fine grid-based lightning disaster risk assessment technology for the power grid. Taking the land fine grid as the basic evaluation unit for the vulnerability of the power grid to lightning disasters, a fine spatial quantification GIS model of power grid vulnerability in lightning disasters is established based on GIS technology, and a power grid based on the external environment (geography and meteorological background) is proposed. The mine risk assessment model, and test the data obtained in this process, including significance test and correlation analysis

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