Technical criteria for wind farm power stations connected to the transmission system - Wind Power Integration: Connection and System Operational Aspects - page 286

final compliance certificate may be subsequently withdrawn for
the non-compliance of the Generator or a Generator's WFPS
with the Grid Code by the TSO and replaced with a restricted
compliance certificate. A restricted compliance certificate shall
be issued to the Generator which shall set out the matters in
respect of which there is a non-compliance; the MVA rating at the
Connection Point to which the WFPS is restricted; the time-
scales for resolution of the non-compliance. Upon resolution of
the non-compliance the TSO in its absolute discretion, may re-
issue a temporary or final compliance certificate.
Utility rules sometimes control ramp rates ( CC .S2.3.7) to
prevent restarting within say 10 minutes of stopping. These rules
reduce the overall output of the wind farm but help to improve
network quality.