ANALYSIS OF LIGHTNING STRIKES ON THE TRANSMISSION LINE BY CONSIDERING THE FREQUENCY-DEPENDENT MODEL
Keywords:
electromagnetic transient mode, vector fitting, multi-port grounding system, impedance modelingAbstract
This research offers new functions for unveiling the appropriate time-domain model of ground systems that can be implemented in EMTP-RV type software. This exploration helps to consider the precise and frequency-dependent behavior of the ground system in the transient and non-transient analysis of power systems with the least error. The proposed solution is divided into several steps: First, the use of the instantaneous electromagnetic method to orbit the Maxwell equations, which leads to the extraction of the impedance matrix of the earth system in the desired frequency range. In the next step, the logical approximation of the impedance matrix of the earth system is performed using the fitting method (VF). The VF method used fits several poles for all the elements of the proposed impedance matrix. Finally, due to the advanced and transient software, it analyzes power systems based on the acceptance matrix. By changing the appropriate variables, the appropriate model of the multi-port ground system in the time domain that can be implemented in the transient state software is presented as the equations of state space. In this paper, the proposed modeling is simulated and operated on a typical 132 kV transmission line. Ground systems have been compared with lesser-known methods such as modeling based on acceptance matrices and conventional modes using simple linear resistors.
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Copyright (c) 2021 EBADOLLAH AMOUZAD MAHDIRAJI, MOJTABA SEDGHI AMIRI, SEYED MOHAMMAD SHARIATMADAR
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