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Abstract
The conductor temperature of an overhead transmission line varies with time and space, which has an important impact on the system operation. In this paper, the conductor temperature is solved iteratively by the CIGRE heat balance equation. The time–space variation of conductor temperature of a 220-kV transmission line is analyzed using real meteorological data from Weihai. Considering the temporal distribution characteristics, the seasonal model of the conductor temperature is given. Considering the spatial distribution, the mean value model, the weight average model, and the segmentation model are established. The system power flow involving the conductor temperature is established based on the relationship between conductor temperature and transmission line parameters. Through the calculation of power flow and the analysis of the maximum power transmission capability, the accuracy of the segmentation model is verified. The results show that the conductor temperature of overhead lines has obvious time–space variation characteristics. It is necessary to consider the time–space variation when analyzing the operation state of power systems.
Highlights
When analyzing the operation state of the power system, we usually apply a single segment lumped parameter model to overhead transmission lines [1,2]
Overhead transmission lines are the main component of power grids, and the variations of conductor temperature in time and space will have an impact on the operation state of the power system
For the transmission line under operation, its carrying current and the meteorological conditions will vary with time and space, and this situation will inevitably lead to time–space variation of conductor temperature
Summary
When analyzing the operation state of the power system, we usually apply a single segment lumped parameter model to overhead transmission lines [1,2] In this model, it is assumed that the current density along the transmission line and material properties are uniform, and the time–space variation of the conductor temperature is ignored. The time–space variation of conductor temperature will inevitably lead to the change of line resistance and reactance parameters, which will further affect the operation state of the power system.
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