基于磁导—电容类比法的高频变压器电磁建模及参数提取方法OA

High-frequency transformers are widely used in new energy power generation,electric vehicles,and large-scale DC source interconnection systems.It is of great significance to set up a high-frequency transformer electro-magnetic model,consider the nonlinear characteristics of the iron core,predict the frequency-variable leakage in-duction and frequency-varying AC resistance of the transformer under high-frequency conditions.The permeability-capacitance analogy,compared with the traditional coupled inductance model and reluctance-resistance analogy model,has the advantages of simple topology,clear energy relationship,and can be applied to non-planar modeling.Based on finite element simulation,the magnetic field distribution of the core high-frequency transformer is ana-lyzed and the magnetic circuit model of the transformer is set up.The hysteresis effect of the core is simulated by the Preisach model considering the reversible component.Based on the Maxwell eddy current field calculator,the leakage magnetic energy and average flux in the leakage magnetic region are extracted to calculate the leakage mag-netic permeance.Combined with the Foster equivalent circuit,the frequency-dependent effects of the winding un-der hgih frequency conditions are simulated.A gyrator-permeability model of the transformer is developed.The cor-rectness of such parameters as inductance and resistance of the model is verified by comparison with the short cir-cuit experimental result of the transformer.Finally,the transformer model is applied to the isolated dual-active full-bridge DC-DC converter(DAB-IBDC)to verify the applicability of the model.