Power quality issues of embedded generation

Renewable sources such as wind energy, hydro, tidal, etc. are intermittent in nature. While feeding the customer loads reliability and quality of the supply are of importance. Induction generators connected to the local grid may lead to severe power quality problems such as flicker, voltage dip. Further, unbalancing of the supply system may distort the supply voltage at the point of common coupling (PCC). In this paper the power quality issues related to the embedded generation has been analyzed. The behavior of the grid with connection/disconnection of the induction generator (islanding), variable wind speed operation, unbalancing, and harmonic injection have been simulated using MATLAB.