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Power Electronics and Wind Power GERTMAR Lars An SVC will have dual purpose for a wind farm: Advantages for the turbines as well as advantages for the grid. When wind turbines are to remain connected to the grid during a fault in the grid, Fig. 7, the SVC will minimize the stresses on the turbine during the fault, Fig. 8. Fig. 7 shows arrangement for simulation of a three-phase short circuit and ground fault close to a wind farm. The duration of fault is 0.2 seconds, and, after clearing, a successful auto reclosure of the line is performed. Wind turbine generators are of the induction type with squirrel cage rotor. Results of two SIMPOW simulations are shown in Fig. 8 with similar axis values. x-axis show time 0 to 5 seconds and y-axis show flux values from 0 to 1.2 per unit and speed values from 0.98 to 1.12 per unit. The upper curves show flux in stator and rotor. The lower curves show wind turbine and generator speeds. Diagram a) shows an obvious low-damped oscillation behaviour during a long time period in case without SVC. Diagram b) shows a well-damped recovery with SVC within less than 2 seconds. a) Oscillating fault recovery without SVC b) Damped fault recovery with SVC Fig. 8: Damping effect of an SVC for a wind turbine compared to no SVC. Source: Per Halvarsson, ABB Power Systems, SVC presentation at Meeting with utility SEAS on island Gotland, April 10, 2003 EPE 2003 - Toulouse ISBN : 90-75815-07-7 P.11PDF Image | Power Electronics and Wind Power
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