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Variable-frequency power transmission line modeling method

A modeling method and transmission line technology, applied in genetic models, electrical digital data processing, special data processing applications, etc., can solve problems such as affecting the accuracy of the model, improve the speed of optimization, improve accuracy, and reduce errors Effect

Inactive Publication Date: 2015-05-13
TIANJIN UNIV
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Problems solved by technology

However, this method is greatly affected by random initial poles, and different initial poles can obtain different rational approximations, which will affect the accuracy of the built model

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  • Variable-frequency power transmission line modeling method
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  • Variable-frequency power transmission line modeling method

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Embodiment Construction

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0023] Because the vector matching method is easily affected by random initial poles, the error of the obtained results is relatively large. Based on this, by constructing the fitness function of iterative poles, genetic operations such as selection, crossover, and mutation are performed on the iterative pole groups that appear in the vector matching process, and the optimal pole is searched for using the global optimization ability of the genetic algorithm, and the pole Applied to the vector matching method, the optimal direction is optimized to guide, and strive to quickly obtain the approximate rational formula with the globally optimal characteristic admittance and delay function. Therefore, the accuracy of the established transmission line model can be improved.

[0024] 1...

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Abstract

The invention discloses a variable-frequency power transmission line modeling method which includes the following steps that a fitness function of iteration poles is built, and selection, crossing and mutation genetic operation are carried out on iteration pole groups occurring in the vector fitting process; the optimal pole is found through global optimization capacity of a genetic algorithm, the optimal pole is applied to a vector fitting method for optimizing guide of an optimization direction, and an approximate rational expression with globally optimal characteristic admittance and a delay function is obtained. The variable-frequency power transmission line modeling method combines the vector fitting method with the genetic algorithm, does not perform pure slow optimization by means of the genetic algorithm, but performs timely rewrite of population individuals according to the rational expression form of the vector fitting method, aims to achieve quick iterative convergence, and greatly increases optimization speed.

Description

technical field [0001] The invention relates to the field of electromagnetic transient research on frequency-variable transmission lines, in particular to a modeling method for frequency-variable transmission lines. Background technique [0002] In order to establish a more accurate transmission line model, the constant parameter transmission line transient equivalent model used in the past is simple but not suitable for the calculation of power system overvoltage. Therefore, considering the frequency-varying characteristics is the premise of establishing an accurate transmission line model. [0003] The line admittance weight function method proposed by Budner will lose a lot of information and be inaccurate during convolution. The forward reverse traveling wave weight function method that appeared later has a large error because it ignores the frequency-varying characteristics of the characteristic impedance. Marti has made the greatest contribution in this field. The Ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/12
Inventor 张炳达赵紫昆王潇
Owner TIANJIN UNIV
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