Electrical energy revolutionary changed human life. Nowadays, because of economical and environmental problems, men have started use of renewable energies instead of fossil fuel sources. In this, wind as new energy source, which can be easily used, has become increasingly important. In order to change the wind energy to electrical energy, different methods have been applied, in which the induction generator with direct connection to network is the most popular. Compared to synchronous machines, the induction machines are low cost and do not need separate dc source and brushes. A problem with in the induction machines is the significant consumption of reactive power, which can be provided by capacitors equipped with power electronics devices. When such a generator operates separated from the power grid, proper adjusting the capacitor value affects the generator output voltage significantly. This research presents a brief study on the new energy sources, wind farms and power electronics in distribution levels. Then, the behavior of an induction generator while separating from grid has been analyzed, and a new equivalent model has been proposed. Based on the proposed model, strategies for regulating voltage using D-Statcom is presented and modified to minimize sudden voltage changes. Moreover, a generator frequency control method is presented and its frequency response is improved, using scalar electric drive technique.
