Study On Hysteresis And Loss Characteristics Of Grain Oriented Electrical Steels Based On Preisach Model

In recent years,more and more scholars have devoted themselves to the measurement and research of magnetic properties and loss characteristics of electrical materials,which is great significance to the manufacture of electrical equipment and the normal operation of power system.With the rapid development of high voltage direct current transmission(HVDC)technology and the extensive use of power and electronic equipment,DC bias and a large number of harmonics are introduced into the power system.The introduction of harmonics and DC bias makes it more difficult to calculate the loss of ferromagnetic materials.Therefore,it is of great significance to study the magnetic properties and loss characteristics of ferromagnetic materials under different excitations.Hysteresis model has attracted much attention as an important tool for studying hysteresis and loss.With the support of the National Natural Fund Project(51777073)and the National Key Research and Development Program Project(2017YFB0902703),the static,dynamic hysteresis and loss characteristics of B27R095 oriented silicon steel sheet under sinusoidal,harmonic and DC biasing excitation are measured by using a single sheet tester(SST)in BROCKHAUS magnetic performance measurement system,respectively.The effects of frequency,harmonic characteristic and DC bias on the hysteresis and loss characteristics of silicon steel sheets are analyzed.In this paper,a method for generating first-order reversal curves based on asymmetric limiting hysteresis loops is proposed,and the first-order reversal curves based on symmetric and asymmetric limiting hysteresis loops are generated respectively.Based on Preisach hysteresis model and loss separation model,the hysteresis and loss characteristics at different sinusoidal frequencies are simulated and analyzed,the dynamic hysteresis and loss characteristics under harmonic excitation are simulated,and the effects of phase difference,harmonic frequency and harmonic amplitude ratio on the loss of separation are analyzed,and the hysteresis and loss characteristics of silicon steel sheet under DC bias excitation are simulated.At the same time,the simulation results are compared with the experimental data to verify the accuracy of the model.