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.
Highlights
With increasing grid-connected wind power penetration level, wind farms cannot be modeled as negativeMany studies were focused on wind power modeling and small-signal stability analysis, there is no consistent conclusion on the problem because of different system models and operating conditions [1]
Because the dynamic behavior of added controllers in doubly-fed induction generator (DFIG) can decrease the stability of the system to some extent, the stability of electromechanical oscillation modes (EOMs) with DFIG calculated by the simplified equivalent model is closer to the detailed model than squirrel cage induction generator (SCIG)
The simplest system model is used for discovering the effects of large-scale wind power on EOMs of synchronous system
Summary
With increasing grid-connected wind power penetration level, wind farms cannot be modeled as negative. Many studies were focused on wind power modeling and small-signal stability analysis, there is no consistent conclusion on the problem because of different system models and operating conditions [1]. The electromechanical oscillation modes (EOMs) of synchronous systems can be affected by gridconnected wind power. The effects of wind farms on EOMs need to be further discovered. We present the eigenvalue analysis method and the prototype sample system for small-signal stability with wind power. The simplified models of three kinds of WTs and the corresponding equivalent model of wind farms can achieve faster calculation speed. Based on the simplified equivalent models, the simulation in MATLAB demonstrates the effects of the wind power on EOMs of synchronous systems
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