Dr. Winter

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Voltage stabilityFault occursFault rectifiedDisconnection of wind farmsincompatible with the systemt [msec]0 100 200 300 400 500 600 700 800Trip of theunder-voltageprotection0100 200 300 400 500Time to disconnection of the wind farmt [msec]100%90%80%70%60%50%0.00 0.25 0.50 0.75 1.00t [sec]No selective disconnection of wind farms incompatible with the systemSelective disconnection of wind farms incompatible with the systemWind farms switch from cos control to voltage control during system faultsETG Conference Reliability of Power Supply 5 February 2003 Page 18Dr. Winter – Grid Planning
Requirements of the dynamic performance of wind energyconverters in the transmission networkSwitch from cos control to voltage control in the event of voltagedips greater than 10 %Reactive power intake may only exceed 25% of the nominal reactivepower of the wind farm during transient balancing time (about 400 ms)Or optionallySelective cut-off of wind generators incompatible with the system- Synchronisation within 2 seconds of the fault being rectified- Increase in power with a gradient of 10% rated power per second- The failure of a wind farm must not last longer than 12 secondsETG Conference Reliability of Power Supply 5 February 2003 Page 19Dr. Winter – Grid Planning
Page 1 and 2: Grid PlanningDr. WinterIntegrating
Page 3 and 4: Installed Capacity in MWDevelopment
Page 5 and 6: Thermal limitsStructurally weakregi
Page 7 and 8: Capacity MWSystem control / Frequen
Page 9 and 10: Frequency stabilityVoltage profile
Page 11 and 12: Frequency stabilitySystem voltage w
Page 13 and 14: Frequency stabilityAction taken in
Page 15 and 16: Voltage stabilityInduction generato
Page 17: Voltage stabilityUCTE/CENTREL model
Page 21 and 22: WEC failures during a 3-phase syste

Dr. Winter

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