A fast transient simulation model of the DFIG based on the switching-function model of the VSC

The EMT simulation for wind farms provides an alternative approach to study interaction between wind farms and power systems. To build up an EMT model of the DFIG, thoroughly considerations should be paid to the characteristics of the back-to-back PWM converter, which plays a crucial role in determining the dynamic behaviors of the DFIG. However, the detailed models of the PWM converters are so complicated that simulations with them may be very time-consuming. Therefore, an accurate and efficient model for the DFIG containing the PWM converters is highly required for the fast EMT simulations of power systems integrated with wind power. In this paper, a modified switching-function model of the three-phase PWM VSC is proposed and applied to the modeling of the DFIG. The accuracy and efficiency of the function model are verified under various cases in PSCAD.