Impact of Wind Generation Mix on Transient Stability for an Interconnected Power System

The rapid growth of wind generation in many European countries is pushing power systems into <br/>uncharted territory. As additional wind generators are installed, the changing generation mix may <br/>impact on power system stability. This paper adopts the New England 39 bus system as a test <br/>system for transient stability analysis. Thermal generator models are based on a likely future plant <br/>mix for existing systems, while varying capacities of fixed-speed induction generators (FSIG) and <br/>doubly-fed induction generators (DFIG) are considered. The main emphasis here has been placed <br/>on the impact of wind technology mix on inter-area oscillations following transient grid <br/>disturbances. In addition, both rotor angle stability and transient voltage stability are examined, and <br/>results are compared with current grid code requirements and standards. Results have shown that <br/>FSIGs can reduce tie-line oscillations and improve damping following a transient disturbance, but <br/>they also cause voltage stability and rotor angle stability problems at high wind penetrations. In <br/>contrast, DFIGs can improve both voltage and rotor angle stability, but their power output <br/>noticeably oscillates during disturbances.