Three-dimensional power-frequency electric-field calculating method of ground below UHVAC power transmission line in complex terrain

Abstract

The invention discloses a three-dimensional power-frequency electric-field calculating method of ground below a UHVAC power transmission line in a complex terrain. The method comprises the following steps of firstly, simplifying the complex terrain into the three-dimensional ground in a fluctuation form and establishing a calculating model; secondly, selecting a mirror image ground and assuming that the mirror image ground is extended into fluctuation ground; then, for line charges of a charged conductor discrete component segment, setting discrete point charges as a regular hexagon honeycomb form in non-mirror-image ground, and simultaneously setting corresponding mirror image charges based on a mirror image principle and establishing a discrete equation of a three-dimensional electric-field integral mathematical model; selecting a primary function as domain impulse function, selecting weight function according to a point collocation method and calculating an inner product in each domain of integration to form a matrix equation; and then, solving the matrix equation and using the calculated charges to calculate a maximum error of a matching point till that a requirement is satisfied; finally, using the optimal discrete charge to calculate three-dimensional power-frequency electric-field distribution of the fluctuation ground. By using the calculating method in the invention, calculating difficulty is reduced, calculating efficiency is increased and an actual engineering need can be well satisfied.

Description

technical field [0001] The invention relates to an electric field calculation method, in particular to a three-dimensional power frequency electric field calculation method on the ground under UHVAC (UltraHigh Voltage Alternating Current: UHVAC) transmission lines in complex terrain. Background technique [0002] With the rapid development of my country's social economy, the demand for electricity continues to increase. At the same time, the increasing environmental pressure makes it difficult to build new power sources in the center of compliance. In order to deal with this situation, it is necessary to transmit electric energy from far away to the center of the load. UHV AC power transmission has the advantages of long-distance transmission, reduced energy loss, and easy networking, which makes UHV AC power transmission develop rapidly in my country. [0003] However, during the operation of UHV AC conductor lines, the electromagnetic environment will be affected, and one...

AI Technical Summary

Problems solved by technology

However, at present, the calculation of the three-dimensional power frequency electric field is mainly carried out for the ideal flat ground, ignoring the influence of complex terrain on the power frequency electric field

However, in the actual erection process of UHV conductor lines, there is no absolute ideal level ground, and UHV AC lines often cross different terrains such as hills, valleys, and plains. Related field tests also show that undulating ground faces the power frequency electric field distribution There is a non-negligible impact

At present, the calculation of the power frequency electric field of the UHV overhead conductor line is based on the ideal flat ground, resulting in large errors in the calculation of the power frequency electric field of the conductor line, making the calculation results lack of reference, although a few researchers have carried out fluctuations The three-dimensional electric field calculation of the terrain, but because the set simulation charge is too large, the practicability is greatly reduced

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