Author(s)

Zezhong Wang, Mengzhen Xuan, Mingyang Li and Suxin Guo

Corresponding Author

Zezhong Wang

ABSTRACT

Aiming at the problem of slow calculation speed and low calculation efficiency of DC biasing of transformer, the excitation current with less influence of saturation degree and the load current with smaller amplitude change are selected as the coordinates to form the sampling plane, and the DC bias in the transformer is studied. Under the influence of strong nonlinearity, the reasonable planning of the sampling interval constitutes a dynamic inductive surface. The fast calculation of the DC bias of the double-winding transformer is realized by two-dimensional interpolation of the dynamic inductor surface, which is compared with the conventional field-circuit coupling method. The accuracy of the method satisfies the requirements of DC bias. This method greatly reduces the calculation time and extends the application prospect of the field-circuit coupling method.

KEYWORDS

Transformer, DC bias, two-dimensional interpolation