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Renewable energy sources (RES), one of the most prominent energy sources, are also gaining significant popularity around the globe. RES based energy systems designed with asynchronous generators with constant speed yield a very cost effective solution for power generation and nowadays are generally used to represent the renewable energy sources in power systems. These asynchronous generators used to consume reactive VARs. For the compensation of these consumable reactive VARs, shunt condensers can be inserted in the system, but these devices usually display very poor results during the transient behaviour of the system. Therefore, powerful and continuous reactive power controllers, such as Flexible Alternating Current Transmission Systems (FACTS), are necessary in these cases. In the present paper, the increment in the stability margin of power systems during the transient turbulences with integrated RES generation using the Static VAR Compensator (STATCOM) is investigated. The RES generators considered are the squirrel cage induction generators (SCIG). Simulation studies are carried out on the IEEE-9 bus design system. Studied results prove that the SCIG with STATCOM device significantly enhances the performance of the designed power network during transient disturbances.

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