Dual active bridge due to load mutations, switching device parameters are inconsistent and power flow direction changes will appear DC current, excessive DC current into the transformer will lead to transformer saturation, seriously endanger the safety of the transformer, so it is necessary to study the suppression measures for the DC component, the parameters of the transformer will change with the degree of saturation, so the accurate modeling of the transformer is necessary for the study of the control strategy.Firstly, obtain the leakage inductance, excitation inductance, resistance and other parameters of the transformer, build a dual active bridge test platform, then obtain the electrical characteristics of the transformer port under the conditions of sudden load changes and power flow changes. Finally Build a model and simulate in the EMTP-RV.The electrical characteristics of the double active bridge under various operating conditions are obtained, and the electromagnetic transient characteristics under various working conditions are simulated to consider the nonlinearity of the transformer core, and the corresponding control strategy needs to be adjusted.

Electromagnetic Transient,Dual Active Bridge,core nonlinear