Analysis of steady-state operation of DFIG-based wind turbines in power systems

This work presents an analysis of steady-state operation of doubly-fed induction generator (DFIG) wind turbines integrated in a power system. It is of interest to use the load flow analysis for obtaining initial conditions for the dynamic analysis of the DFIG in power system stability studies, as the variables in dynamic models must coincide with those in stationary models during steady-state operation. To solve this problem, a method for incorporating the non-linear fifth-order model of DFIG wind turbines based on the Newton-Raphson algorithm is proposed for obtaining the steady-state electrical variables of the machine under certain given conditions. Results obtained from the load flow analysis allow initializing the electrical variables for use in a fifth order dynamic model of the DFIG.