Research on Vibration of Converter Transformer under DC Bias Magnetism

During operation, the converter transformer may experience DC bias, leading to increased vibration. In order to solve this problem, this paper comprehensively considers the electromagnetic field theory and Solid mechanics theory, and establishes a Multiphysics simulation coupling model of converter transformer. Based on this model, simulate and analyze the changes in magnetic flux density, stress, and displacement parameters of the converter transformer core and winding during the process of increasing the DC bias coefficient from 0 to 1.5, in order to explore the vibration characteristics of the converter transformer under the influence of DC bias. The results indicate that with the addition of DC components, the magnetic flux density, stress, and displacement of the core and winding of the converter transformer increase, indicating that the overall vibration of the converter transformer intensifies. In terms of specific performance, the increase in magnetic flux density of the iron core and winding decreases as the iron core approaches saturation. In terms of stress, the trend of core stress change is the same as that of magnetic flux density change, but the winding stress maintains a stable growth with the increase of DC component.