Practical calculation model for short-circuit current of doubly fed induction generator in large power grids

The short-circuit current (SCC) calculation of doubly fed induction generator (DFIG) is very complicated, which is influenced not only by flux coupling between generator stator and rotor, but also by rotor side converter (RSC) control or crowbar protection response. Based on our previous work, this paper analyzes the influence of different parameters on the calculation results of each component of DFIG SCC, as well as the influence of the neglection of some parameters on the calculation accuracy of SCC. By extracting the key influencing factors, a practical DFIG SCC calculation model suitable for large power grids is obtained. The model has the advantages of parameters-easy-to-access and clear defination. Meanwhile, according to the different requirements of SCC calculation, the corresponding calculation suggestions are given for the completely unknown parameters.