Sub-Synchronous Resonance Analysis and Simulation on Wind Farm

Renewable energy sources, especially wind power, are considered as important generation alternatives in electric power systems due to their non-exhausted nature and benign environmental effects. The increasing penetration of wind power into grid systems made it necessary for the integration of wind farms with series compensated transmission networks to ensure reliable and efficient power flow. However, it is shown that a series-compensated wind farms may cause system instability. In this paper the phenomenon of Sub Synchronous Oscillation of Doubly-Fed Induction Generator based wind energy systems has been investigated. Firstly, the dynamic subblock models of wind power generation system are built, which includes: Wind turbine model, doubly fed generator electrical model, converter model, controller model. Then, a system model is designed, according to an actual wind farm situation. Extensive simulation results show the impact degree of the number of units, single output, and control system parameters on the oscillation, by which we could mitigate SSR to some degree. Finally, the given tests simulation prove that these methods are satisfied.