About the Distorting Regime Induced by an Electronic Induction Heating System

The paper deals with the operational principles, schematic diagrams, and implementation of an electronic induction heating system prototype. The system has 2 operational modes: power saving and normal. Data relative to 3-phase currents and voltages were acquired from the heating system terminals and analyzed with original software packages relying on Fast Fourier Transform and Discrete Wavelet Transform. A good convergence of results representing power quality indices was obtained. It was proven that the current total harmonic distortions were higher for the power saving mode, with a large spectrum of harmonics and both operational modes have unacceptably high values comparing to standards for power quality and electromagnetic compatibility. It is concluded that measures for protecting the supply network are necessary to improve power quality and electromagnetic interferences of the analyzed system.