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In this paper, based on a small-size power system, a deterministic assessment on the impact of wind power on power system small-signal stability is first thoroughly discussed. Next, a realistic weak wind-hydro-thermal (WHT) power system is used to ascertain if the indicative findings of the preliminary work can be confirmed by a large scale case study. Subsequently, Monte Carlo based probabilistic eigenanalysis is implemented on the weak WHT system in order to further corroborate the findings drawn from the deterministic studies. It was found out that large wind power integration can have positive or negative impacts on system damping depending on the location of the wind power plant, the amount of the conventional generation replaced by wind power and the stress level of the power system.