Power frequency electric field computing method for rolling ground overhead transmission line based on charge simulation method

Abstract

The invention provides a power frequency electric field computing method for a rolling ground overhead transmission line based on a charge simulation method. The method comprises the following steps that a, a mirroring ground is selected, and it assumes that the mirroring ground extends into a rolling ground; b, simulated charges and matched points corresponding to the simulated charges are arranged on a wire and a non-mirroring ground, and the electric potential of the rolling ground is made to be zero; c, on the basis of the superposition principle, a simulated charge equation set is constructed, and the simulated charges are solved according to the simulated charge equation set; d, power frequency electric field distribution of the rolling ground is computed according to the simulated charges. The method is based on the image theory and combined with the simulated charge optimization method, the electric field distribution of the complex terrain where an overhead conductor path passes through can be computed, the technical problem that the electric field distribution of the rolling ground cannot be accurately computed in the traditional method is effectively solved, accuracy of power frequency electric field computation of the conductor path is effectively improved, computation difficulty is greatly lowered, the computation quantity is reduced, computation precision is further improved, and the adaptability of the electric field computation method is enhanced.

Description

technical field [0001] The invention relates to an electric field calculation method, in particular to a power frequency electric field calculation method of an undulating ground overhead transmission line based on an analog charge method. Background technique [0002] With the continuous development of my country's economy and the continuous improvement of people's living standards, the demand for electricity has grown rapidly, and the scale and capacity of the power grid have continued to increase. In order to reduce transmission corridors and improve line transmission capacity, the development of high-voltage AC conductor lines has become an inevitable choice. [0003] The electromagnetic environment will be affected by the high-voltage AC conductor line during its operation. At present, the calculation of the power frequency electric field at home and abroad generally adopts the equivalent charge method recommended by the 36.01 working group of the International Large-sc...

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Problems solved by technology

[0003] The electromagnetic environment will be affected by the high-voltage AC conductor line during its operation. At present, the calculation of the power frequency electric field at home and abroad generally adopts the equivalent charge method recommended by the 36.01 working group of the International Large-scale Power Grid Conference, and it is mainly aimed at the fact that the ground is an ideal flat ground. carried out, ignoring the influence of the ground on the power frequency electric field

However, in the actual erection process of high-voltage conductor lines, there is no absolute ideal level ground, and the field test for this situation shows that the undulating ground has a non-negligible influence on the power frequency electric field distribution

At present, the calculation of the power-frequency electric field of the high-voltage overhead conductor line is based on the ideal flat ground, which causes a large error in the calculation of the power-frequency electric field of the conductor line, making the calculation results lack of reference, and when considering the terrain, it needs to be under the line A large number of simulated charges and matching points are set on all surfaces in the calculation area, lack of optimization process, and heavy calculation workload, which still makes the accuracy not guaranteed

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