Study of Energy Circulation Processes in Multilevel Voltage Inverter for Multifrequency Induction Heating of Metal

The paper is devoted to the problem of energy flows studying in a universal multilevel inverter, when an output voltage with a complex and controlled harmonic composition of the curve is forming. It is intended for multifrequency induction heating of metal blocks containing of various sizes fragments. Energy processes in such inverter differ from those well studied in traditional two-level voltage inverters, which follows directly from the difference in the principles of the output voltage curve forming in these converters. The patterns studying of these processes in a universal multilevel inverter is the purpose of this article. The methodology for the goal achieving consists in identifying of the main energy flows between elements of its power circuit, development of their mathematical and computer models that allow studding of their flow patterns. The practical and scientific significance of results presented in the paper consists in their use to optimize the control system and justify the choice of elements parameters of the converter circuit for multifrequency metal heating equipment.