Abstract
With the rapid growth of grid-connected wind power penetration level, it is necessary to study the impacts of wind power on power system stability. The small-signal stability of power systems with large-scale wind power is explored using the eigenvalue analysis method. A prototype sample system, the two-synchronous-generator system with a wind farm, is proposed for theoretical analysis. Then, simplified models of wind turbines (WTs) and the corresponding equivalent models of wind farms are analyzed. Three kinds of typical WT models, i.e., squirrel cage induction generator, doubly-fed induction generator, and permanent magnet synchronous generator are used. Furthermore, based on the simplified equivalent models, effects of large-scale wind farms on the electromechanical oscillation modes (EOMs) of synchronous systems are discussed. Simulation results indicate that wind farms of the three kinds of WTs have positive effects on EOMs. However, long transmission lines connecting wind farm to the system may produce negative effects on the small-signal stability of the system.
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