Comparison of power quality in different grid-integrated wind turbines

Nowadays, the proportion of wind turbines and the dimensions of wind plants have increased significantly all over the world. This paper describes a comparison of the power quality for wind power systems based on three different popular wind generators: the squirrel-cage induction generator (SCIG), the doubly-fed induction generator (DFIG) and the permanent-magnet synchronous generator (PMSG). Although a fixed speed system is more simple and reliable, it severely limits the energy output of a wind turbine and power quality. In case of variable speed systems, comparisons shows that generator of similar rating can significantly enhance energy capture as well as power quality. The performances of these wind turbines and their characteristics are analyzed in steady-state. Simulation results matched well with the theoretical turbines operation.