Accuracy of the Inverse Fast Fourier Transform algorithm in grounding grid transient analysis
Abstract
In this paper, accuracy of the Inverse Fast Fourier Transform (IFFT) algorithm is analysed, when used to compute the potential distribution in grounding grid transient analysis. The accuracy of the classical IFFT algorithm is questionable when the computations are carried out at relatively large distances between field points and source points. Accuracy deficiencies of the classical IFFT algorithm and the modified IFFT algorithm used in the well-known program package CDEGS are analyzed. Accuracy of these algorithms is tested using a highly accurate algorithm for computing the inverse Fourier transform based on numerical integration. Computation of the scalar potential distribution due to a point current source in unbounded and uniform earth is used as an illustrative test example.
Dino Lovrić
Associate Professor | Department of Theoretical Electrical Engineering and Modelling
Associate professor at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with reserch focused on the development of numerical models of grounding systems in various types of soil, particularly in scenarios involving the dissipation of alternating current and transient currents caused by lightning strikes or switching overvoltages, also involved in developing models of dynamic and transient processes in power systems using modern numerical methods.
Slavko Vujević
Professor Emeritus
An expert in electrical engineering, particularly known for his contributions to numerical modeling of electromagnetic phenomena, lightning protection, and grounding. Throughout his career, he was a key member of the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, where he taught, mentored students, and actively participated in scientific research and international professional organizations.
