Advanced Modeling of Magnetic Cores for Damping of High-Frequency Power System Transients

• Published in: IEEE transactions on power delivery Vol. 31; no. 5; pp. 2431 - 2439
• Main Authors: Szewczyk, Marcin, Kutorasinski, Kamil, Pawlowski, Jaroslaw, Piasecki, Wojciech, Florkowski, Marek
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuits; Current measurement; Frequency dependence; Frequency measurement; Impedance; Integrated circuit modeling; Magnetic cores; Magnetization; modeling; power system transients; saturation effect; simulations; Transient analysis
• ISSN: 0885-8977; 1937-4208
• DOI: 10.1109/TPWRD.2016.2545922

This paper presents a novel approach to modeling magnetic cores for high-frequency transient analyses in power system applications. A method is presented to obtain a frequency-dependent, nonlinear equivalent circuit model of magnetic cores, suitable for simulations of transients in high-frequency and high-current conditions. The model can be used in any Electromagnetic Transients Program (EMTP)-like simulation software for power system transient analyses and hardware design of transient mitigation solutions. The model has been developed based on the frequency characteristics of the complex impedance of a magnetic core, measured for different operating points on the magnetization curve. Based on the measured characteristics and on some basic material properties, a nonlinear equivalent model composed of a set of lumped elements was established. The presented method is generic; however, the results are presented for a magnetic core of nanocrystalline type and the model implementation is shown in EMTP simulation software. The exemplary model is dedicated for the frequency range f = 1 kHz ÷100 MHz, and for the current range I = 0 ÷ 10 kA. The model accuracy was validated with selected measurement results, and the accuracy of the method is thoroughly discussed.