Abstract
Current field calculation based on the resistance network method (RNM) and temperature field calculation based on the finite volume method (FVM) can be used to evaluate the performance of high-voltage direct-current (HVDC) grounding electrodes. The main idea of the two methods is to transform an electric and temperature field problems to equivalent circuit problems by dividing the 3D soil space near the grounding electrode into a suitable number of contiguous and non-overlapped cells. Each cell is represented as a central node connecting to the adjacent cells. The resistance network formed by connecting all the adjacent cells together can be solved to calculate the current field. Under the same conditions, the results calculated by the RNM are consistent with the result by CDEGS, a widely used software package for current distribution and electromagnetic field calculation. Based on the finite volume method, the temperature field results are also calculated using time domain simulation.
Highlights
high-voltage direct-current (HVDC) transmission is a common technology for longdistance and high-capacity power transmission [1, 2]
Considering the limitations of the present methods for calculating current and temperature fields, this paper describes a new resistance network method (RNM) for calculating the current field and a finite volume method (FVM) for calculating the temperature field, which are both relatively simple in formulation
The time-domain simulation based on FVM provides an important alternative way to check the temperature requirements at the basic design stage of HVDC projects, which could lead to better use of the grounding electrode without extending its dimension
Summary
HVDC transmission is a common technology for longdistance and high-capacity power transmission [1, 2]. The complex image method has a high accuracy and is simple in operation [9] This method requires vertically stratified soil and is not applicable when the soil resistivity varies in all directions. The boundary element method for calculating the current field is relatively complicated in its formulation and calculation, and the finite element method requires large memory [10]. These drawbacks exist for the finite difference method for calculating the temperature field. Considering the limitations of the present methods for calculating current and temperature fields, this paper describes a new resistance network method (RNM) for calculating the current field and a finite volume method (FVM) for calculating the temperature field, which are both relatively simple in formulation
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