A NEW METHOD FOR TAKING INTO ACCOUNT THE NONLINEARITY OF THE POWER TRANSFORMER PARAMETERS IN MATLAB/SIMULINK

The analysis of methods for calculating the parameters of the Simulink model of three-phase nonlinear power transformers is carried out. The developed methodology for calculating the magnetization curve of the transformer is proposed, based on the knowledge of only the transformer nameplate data, significantly reducing the preparation time of the source data. The results of numerical studies allow us to conclude that the magnetization curve of the transformer obtained on the basis of the proposed calculation method, taking into account all the assumptions made, is correct and with a sufficient degree of accuracy coincides with the exact curve obtained by the full electromagnetic calculation of the transformer. Assessment of possible errors introduced by the accepted assumptions in the proposed method for calculating the magnetization curve was carried out by simulating the no-load mode, with the analysis of the no-load current values. The correctness of the proposed method is proved by analysis of the external and operating characteristics of the transformer. The proposed method for calculating the magnetization curve is quite simple and understandable, it can significantly reduce the time it takes to prepare the initial data for modeling and can be successfully used for educational and research purposes. The development of this method will make it possible to conduct a comparative analysis of the parameters and characteristics of a large number of different transformers according to passport data without their complex and time-consuming full electromagnetic calculation.

Authors: A. G. Lavrov, D. S. Ilyashov, M. A. Sitnikov

Direction: Electrical Engineering

Keywords: Simulink models, three-phase nonlinear transformer, magnetization curve, transformer rating data, power transformer characteristics

---

View full article