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CPOTE2020 logo
6th International Conference on
Contemporary Problems of Thermal Engineering
Online | 21-24 September 2020

Abstract CPOTE2020-1247-A

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Measurement and analysis of power losses in sintered cores for power electronic devices in renewable energy systems

Pawel LASEK, Silesian University of Technology, Poland
Mariusz STEPIEN, Silesian University of Technology, Poland

With an increasing number of renewable energy systems, the global trends are focused on the increase of efficiency of electric energy conversion systems with a simultaneous decrease in cost and dimensions of devices. Ferromagnetic-based components are one of the major elements where power losses can be reduced as well as dimensions and weight. In renewable sources such as PV panels or low power domestic wind turbines where power converion occures power electronic devices are used. Such devices usually operate at high frequency, generally tens of kilohertz and couple kilowatts of power. The ferromagnetic materials are used in inductive elements such as chokes and transformers. The main consideration is picking the appropriate material for given operating conditions, like in DC/DC or DC/AC converters. The main objective of the following paper is to analyze losses occurring in inductors where cores are made of different materials like ferrites or iron powders. The windings are made using different wire diameters and types, like solid copper wires or litz wires. The losses in analyzed components are up to 10W of total power. The main method of measurement is carried using the calorimetric method. These results are compared with electrical measurements taken with a high precision power analyzer. So far, known power loss models like General Steinmetz Equation (GSE) relate to harmonic waveforms like sinusoids. There is the Improved General Steinmetz Equation (iGSE) or other similar, but parameters from GSE do not relate very well to other models for arbitrary current waveforms. The losses are obtained for high-frequency waveforms like triangular with DC bias and sinusoids combined with high-frequency components. Measured losses are split between winding and core losses. Based on that, the mathematical model for loss estimation is derived for different types of waveforms and frequencies. The following model is used for coupled finite-element method (FEM) simulation in order to calculate power losses and temperature field for tested current waveforms.

Keywords: Power electronics, Power losses, Inductors, Finite element method, Renewable energy sources (RES)
Acknowledgment: Publication supported by Own Schoolarship Fund of the Silesian University of Technology in year 2019/2020