High voltage insulator numerical optimization method based on small population real-coded genetic algorithm

Abstract

The invention discloses a high voltage insulator numerical optimization method based on a small population real-coded genetic algorithm and belongs to the field of optimization technology. The methodcomprises the following steps: based on a niche genetic algorithm of a sharing function, adjusting the fitness of each individual in a population; based on numerical values of the obtained fitness, solving a minimum value problem by adopting a reverse selection operator; guiding cross pairing by adopting Euclidean distances among the individuals, and obtaining a parent population selection operator; based on the obtained parent population selection operator, modifying a cross algorithm containing an amplification factor, thus a novel cross algorithm is obtained; and modifying a mutation operator in a real genetic algorithm, thus a modified mutation algorithm is obtained. A genetic algorithm is combined with a finite element method, a basic genetic algorithm is improved, an improved geneticalgorithm maintaining population diversity is provided, and electric field distribution of an insulator is beneficially and effectively improved, so that the structure of the insulator and the structure of a grading ring are more reasonable; and scale of the required population is small, so that optimization time is shortened.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a numerical optimization method for high-voltage insulators based on a small population real number genetic algorithm. Background technique [0002] Insulators are widely used electrical products in UHV transmission lines and substations. Their insulation performance will directly affect the safe operation of the entire line and substations, and are an important aspect of equipment safety. Compared with disc insulators such as porcelain and glass, composite insulators have many advantages such as light weight, high strength, strong pollution flashover resistance, no need for cleaning, and easy installation, operation and maintenance. However, due to the capacitance between the metal part of the insulator and the grounding tower or live wire, the voltage distribution along the insulator string is uneven. In addition, because composite insulators do not have intermediate metal compone...

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Problems solved by technology

[0003] In the calculation of the electric field of insulators, it is generally necessary to consider the influence of towers and wires. Due to the complexity of the overall structure, it is difficult to optimize with traditional methods

Factors such as the structural parameters and installation position of the grading ring will directly affect the electric field distribution along the surface of the insulator; at the same time, when the electric field intensity on the surface of the grading ring itself exceeds 2.2kV / mm, the grading ring itself will also generate corona, which will reduce the Insulation performance of the insulator

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