Active Power Control in Wind Driven Variable Speed Squirrel-Cage Induction Generator

This paper describes active power control in a grid connected variable speed wind electric generation system (WEG) using squirrel cage induction machine. The chosen variable speed WEG system consists of a wind turbine, squirrel-cage induction generator, an AC-DC-AC interface and the power grid. In this work the generator side converter is controlled using vector control of induction machine and the grid side converter is controlled using DC link voltage control. Active power delivered by the WEG to the grid when driven by a wind speed can be controlled, albeit within a limited range, by varying the DC link voltage at the input of the grid side converter. The WEG scheme is simulated using system models in MATLAB-Simulink and the performance is studied.