Power transmission line lightning protection measure optimization selection method based on TOPSIS method

Abstract

The invention provides a power transmission line lightning protection measure optimization selection method based on a TOPSIS method, and the method comprises the steps: enabling lightning protectionmeasures to be in one-to-one correspondence with initial evaluation indexes after a tower needing lightning protection transformation is determined, carrying out the scoring of the initial evaluationindexes of the lightning protection measures, setting the score as an initial decision matrix X of the TOPSIS method, normalizing the initial decision matrix to obtain a normalized decision matrix R,solving the weight of each initial evaluation index by using an analytic hierarchy process to obtain a weighted normalized decision matrix Z, solving the optimal and worst values and the positive andnegative ideal solutions of each initial evaluation index, obtaining the Euclidean distance between each lightning protection measure and the positive and negative ideal solutions according to a TOPSIS method, obtaining the relative closeness, taking the relative closeness as a comprehensive evaluation index, obtaining the optimal selection sequence of lightning protection measures according to the size of the comprehensive evaluation index, carrying out the optimal selection of the lightning protection measures for each base tower through employing a TOPSIS method based on the specific conditions of each base tower, and guaranteeing the lightning protection performance of the tower.

Description

technical field [0001] The invention relates to the technical field of lightning protection for transmission lines, in particular to a method for optimizing and selecting lightning protection measures for transmission lines based on the TOPSIS method. Background technique [0002] Lightning is an important reason that affects the safe and stable operation of transmission lines. According to statistics, tripping accidents on transmission lines due to lightning strikes account for 40% to 70% of the total accidents every year. Once a tripping accident occurs on a transmission line, it will cause huge economic losses. People's production and life are inconvenient. With the shortage of line corridors, the number of double-circuit or multi-circuit transmission lines on the same tower is increasing, and the height of towers is increasing; and due to the construction of expressways, the data of long-span and tall towers has increased sharply. These factors are The probability of the...

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Problems solved by technology

[0002] Lightning is an important reason that affects the safe and stable operation of transmission lines. According to statistics, tripping accidents on transmission lines due to lightning strikes account for 40% to 70% of the total accidents every year. Once a tripping accident occurs on a transmission line, it will cause huge economic losses. People's production and life are inconvenient. With the shortage of line corridors, the number of double-circuit or multi-circuit transmission lines on the same tower is increasing, and the height of towers is increasing; and due to the construction of expressways, the data of long-span and tall towers has increased sharply. These factors are The probability of the transmission line tower being struck by lightning is greatly increased. In view of the above situation, many effective measures have been taken to improve the lightning protection performance of the line (such as reducing the grounding resistance of the tower, strengthening the insulation level, erecting coupling ground wires, installing anti- Lightning protection measures such as shielding side needles, installing line arresters, etc.), the application purposes and effects of various lightning protection measures are different, and the cost and difficulty of implementing different measures in different regions are also different

[0003] However, in actual engineering, many areas still adopt extensive lightning protection transformation management methods, regardless of the characteristics of transmission lines and lightning protection measures, and choose a single lightning protection measure for treatment without any difference, making the treatment effect insignificant. The tower needs to be rebuilt, which greatly wastes manpower and material resources. The evaluation model of lightning protection measures has too much influence of human subjectivity, and the factors considered are not comprehensive enough, so it cannot objectively and reliably evaluate the application effect of lightning protection measures.

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