Dr. Winter

Voltage stabilityUCTE/CENTREL model - installed wind capacity: 5,000 MWSystem voltages after a 3-phase fault at Dollern substation – fault remedied after 150 msUnterweser380 kVDeviation of the system voltage from the nominal system voltage in %-50%Krümmel380 kV-50%Conneforde220 kV-50%SottrumEms Elbe110 kVOldenburgWeser Ems110 kV-50%-50%Hamburg NordSchleswig-Holstein110 kV-50%0.00 0.25 0.50 0.75 1.00t [sec]Voltage dip caused by the phase effects of wind farms, control of which ceasesin the event of a fault brought about by high rotor currents (around 75% of rated voltage)ETG Conference Reliability of Power Supply 5 February 2003 Page 17Dr. Winter – Grid Planning