Unified modeling method of same-tower multi-loop electric transmission line based on pole and tower structures and wire parameters

Abstract

The invention discloses a unified modeling method of a same-tower multi-loop electric transmission line based on pole and tower structures and wire parameters. The method includes the steps of collecting required basic information in the modeling process, calculating an impedance / admittance matrix of the corresponding unit length of each pole and tower structure after ground electrode influences are eliminated, and conducting replacing operation on the impedance / admittance matrixes for the pole and tower structure for erecting a different-wire same-tower multi-loop part to obtain a corresponding impedance / admittance matrix. On the basis, positive sequence impedance and zero sequence impedance of each loop are calculated and compared with the measured value corresponding to the loop, and soil resistance is adjusted according error magnitudes till errors meet requirements. The same-tower multi-loop electric transmission system is segmented, a line model is matched for each segment with the line length of each segment, whether the segment fails in setting, the wire type of the segment and the pole and tower constitution conditions of the segment as the evaluation standards, and the line model is dynamically matched for each segment of the line when failure points and failure segments change.

Description

technical field [0001] The invention relates to the technical field of simulation modeling of an AC high-voltage transmission system, in particular to a unified modeling method for multi-circuit transmission lines on the same tower based on tower structures and wire parameters. Background technique [0002] When modeling and analyzing transmission lines, there are currently two mainstream calculation models: centralized parameter model and distributed parameter model. The lumped parameter model has higher calculation accuracy when the line length is less than 60km; while the distributed parameter model is suitable for the case where the line length is greater than the product of the speed of light and the time-domain calculation step. Usually, the time-domain calculation step is 50us, that is, The length of each line is greater than 15km. [0003] For the situation that a transmission line uses a variety of structural towers during the erection process, if the differences b...

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Problems solved by technology

[0003] For the situation that a transmission line uses a variety of structural towers during the erection process, if the differences between the tower structures are to be accurately considered, when using the above two models to model the line, it is necessary to model one by one based on the towers, and it is impossible to consider Influenced by the soil resistivity; especially for the distributed parameter model, modeling based on towers one by one is not only time-consuming and laborious, but also has the problem of insufficient calculation accuracy if the line length is too short

[0004] In addition, in multi-circuit transmission lines on the same tower, it is very common that different conductors are used for different circuits, and the conventional distributed parameter model and concentrated parameter model cannot take into account the parameter differences between different conductors, so it is necessary to calculate and analyze will introduce an unavoidable fixed error term, which reduces the reliability of the calculation results

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