Multi-resolution modeling of induction furnace systems with line-commutated rectifier and resonant converter

Line-commutated thyristor-controlled rectifiers are extensively used in industrial applications, where controllable dc voltage is required. The simulation software developments trend is towards proposing new packages for power electronics components that are computationally more efficient and still accurate. One of the most widely-used modeling techniques is known as parametric average value modeling (PAVM), which avoids the discrete switching states of the converters and introduces computationally efficient models that are suitable for system level studies. In this paper, an industrial application of PAVM of a controlled thyristor bridge rectifier is investigated in conjunction with four different switching resolution levels of a practical induction furnace load. The analytical dynamic model of the induction furnace system is also derived in order for decoupling the furnace-side converter from the grid-side network. The superior performance of different switching-reduced models in terms of CPU efficiency as well as accuracy are verified by simulation results.