Numerical Calculation of Transient Parameters of Dual-Excited Synchronous Generator Based on Time-Stepping Finite Element Model

The Dual Excitation Synchronous Generator (DESG) has two sets of field windings that can be independently excitation regulated, thus has better stability and reliability than the Traditional Synchronous Generator (TSG). However, the special excitation structure and excitation mode of the DESG result in the transient parameters of the DESG that are very different from those of the TSG. Therefore, the calculation method of the transient parameters of the TSG is not applicable to calculate the transient parameters of the DESG. In this paper, a Time-Stepping Finite Element Model (T-S FEM) of the DESG is established to study the impact of the excitation structure on the transient parameters. The transient parameters of the DESG under the different saturation states are calculated by improved frequency domain method and frozen permeability method, and the results from these methods are compared. The differences between the transient parameters of the DESG and TSG, as well as the influence of the saturation on the transient parameters are analyzed. The results of this study provide a theoretical basis for accurate simulation calculation of the DESG.