Determining magnetically nonlinear characteristics of transformers and iron core inductors by Differential Evolution

摘要

This paper deals with the Differential Evolution(DE) based method for determining magnetically nonlinear iron core characteristics of transformers and iron core inductors. The unknown iron core characteristic, given as a sum of exponential functions, is included into dynamic model of the tested device. It is determined by the DE. The objective function is the best possible agreement between the measured and by the model calculated currents for given voltages. Using the inrush currents and corresponding voltages, the magnetically nonlinear characteristic can be determined in a broad operation range. The inclusion of iron core characteristic determined by the proposed method into transformer dynamic model gives a very good agreement between the measured and calculated currents in transients and in steady states.