Impact of Grid Connection of Large-Scale Wind Farms on Power System Small-Signal Angular Stability

The grid connection of a large-scale wind farm could change the load flow/configuration of a power system and introduce dynamic interactions with the synchronous generators (SGs), thus affecting system small-signal angular stability. This paper proposes an approach for the separate examination of the impact of those affecting factors, i.e., the change of load flow/configuration and dynamic interactions brought about by the grid connection of the wind farm, on power system smallsignal angular stability. Both cases of grid connection of the wind farm, either displacing synchronous generators or being directly added into the power system, are considered. By using the proposed approach, how much the effect of the change of load flow/configuration brought about by the wind farm can be examined, while the degree of impact of the dynamic interaction of the wind farm with the SGs can be investigated separately. Thus, a clearer picture and better understanding of the power system small-signal angular stability as affected by grid connection of the large-scale wind farm can be achieved. An example of the power system with grid connection of a wind farm is presented to demonstrate the proposed approach.