to prevent a short circuit at HV or EHV level from causing a widespread loss of generation.
Modern large-scale wind turbines, typically 1 MW and larger, are normally required to include systems that allow them to operate through such an event, and thereby “ride through” the voltage dip.
Similar requirements are now becoming common on large solar power installations that likewise might cause instability in the event of a widespread disconnection of generating units.
Depending on the application the device may, during and after the dip, be required to:[5] A variety of standards exist and generally vary across jurisdictions.
[12] For wind turbines, the FRT testing is described in the standard IEC 61400-21 (2nd edition August 2008).