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1. (WO2018121825) FREQUENCY DEPENDENT POWER RAMP RATES FOR WIND TURBINES

Pub. No.:    WO/2018/121825    International Application No.:    PCT/DK2017/050436
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Tue Dec 19 00:59:59 CET 2017
IPC: F03D 7/02
F03D 9/25
F03D 7/04
Applicants: VESTAS WIND SYSTEMS A/S
Inventors: KJÆR, Martin Ansbjerg
ØSTERGAARD, Kasper Zinck
Title: FREQUENCY DEPENDENT POWER RAMP RATES FOR WIND TURBINES
Abstract:
The invention relates to a method for controlling a wind turbine to change a power reference Pref from a first power level to a second power level dependent on a comparison of a grid frequency f with a frequency threshold fT. In order to enable fast changes of the power reference Pref in case of a relatively large deviation of the grid frequency relative to the nominal grid frequency, a power ramp rate allowing a fast change of the power reference may be set if the grid frequency is greater than the frequency threshold.