Damping of low frequency power oscillations is one of essential aspects of maintaining powersystem stability. In literature can be found publications on damping capability of Doubly Fed Induction Generator based wind turbines. This paper extends discussion on Wind Power Plantdamping capability to Full-Scale Converter based type. Moreover resemblance of such WindPower Plant to modern FACTS devices is recognized and exploited. Paper discusses many aspect of damping controller design, including feedback signal selection and controleffectiveness with respect to wind farm location. Analysis and design is based on modal analysis, therefore matching modeling approach for wind power plant is proposed. Finally, performance of Wind Power Plant damping control is compared to a regular power systemstabilizer installed on a synchronous generator.