Transformer partial discharge ultrahigh frequency detection Hilbert fractal antenna optimization method

Abstract

The invention discloses a transformer partial discharge ultrahigh frequency detection Hilbert fractal antenna optimization method. The method includes the following steps: S1, determining a fitness function of a genetic algorithm according to a design object of an ultrahigh frequency antenna, and controlling the search direction of the algorithm; S2, determining structural parameters a, b, and c, of the antenna and an encoding and decoding scheme of (x, y); S3, using each group of structural parameters of the ultrahigh frequency antenna as an individual, and determining a certain number of individuals as an initial population of the genetic algorithm; S4, decoding a binary code of each individual into a structural parameter of the ultrahigh frequency antenna, invoking Ansoft Designer software to perform simulation so as to acquire an electrical characteristic parameter of the antenna, and substituting the calculated standing-wave ratio into the fitness function to calculate the fitness value of the individual; and S5, determining if a design demand of the antenna is met or not according to the returned fitness value of the individual. The invention provides an analysis antenna automatic optimization algorithm which can improve the design ability and efficiency of the antenna, and can acquire a partial discharge ultrahigh frequency detection Hilbert fractal antenna having excellent performance.

Description

technical field [0001] The invention relates to an on-line or off-line detection technology for partial discharge of power equipment such as transformers, in particular to a Hilbert fractal antenna optimization method for ultra-high frequency detection of partial discharge of transformers. Background technique [0002] Miniaturized, broadband UHF antenna is one of the hot issues in the field of antenna research. In order to avoid corona pulse interference and have sufficient sensitivity, the lower limit of the frequency band of UHF partial discharge monitoring is usually 300MHz, and the upper limit of the frequency band can reach 3GHz. Therefore, the UHF partial discharge monitoring antenna is a broadband antenna. In order to be easily installed inside the transformer or on the dielectric window on the transformer box, the miniaturization of the transformer partial discharge UHF monitoring antenna is one of the key issues in its engineering application. For ordinary UHF ant...

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Problems solved by technology

There are three main problems in the existing antenna design work: (1) Due to the close relationship between the performance of the fractal antenna and the antenna parameters, the antenna design is performed by artificially setting the parameter values ​​for simulation calculation, and the simulation calculation cannot be completed automatically. The optimal value has a certain deviation; (2) The influence of the thickness of the antenna conductor and the medium on the performance of the antenna is not considered; (3) In the simulation calculation, the threshold value of the antenna standing wave ratio is set to 5, and the standing wave ratio of the usual antenna design is 2 goals have a certain gap

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