The integration of a Wind Power Plant (WPP) is a solution to increase the reliability of the electricity supply. Moreover, it potentially affects power system dynamic operation and control. The novel features of WPP involve fluctuated wind power injection, less-inertia characteristic, and sophisticated control system alter power flow of the power system and may interact with compensator devices and the existed synchronous generators. This paper investigates the effects of WPP integration on Sub-Synchronous Resonance (SSR) of the power system. A practical test system of South West Sulawesi is investigated. Three analytical methods; frequency scanning, modal analysis, and time-domain simulations, were proposed to analyze and assess the impact of DFIG based WPP integration on the SSR. It was monitored that the DFIG based WPP contributed to enhancing the system dynamic performance. The additional power injection from DFIG based WPP might relieve the stress of the synchronous generator and reduce the transmission line congestions. The more damped situation with WPP integration resulted in mitigation of the oscillatory conditions at sub-synchronous frequency.