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1. (WO2017202945) WIND TURBINE SYSTEM WITH IMPROVED STABILITY DURING SHUTDOWN

Pub. No.:    WO/2017/202945    International Application No.:    PCT/EP2017/062597
Publication Date: Fri Dec 01 00:59:59 CET 2017 International Filing Date: Thu May 25 01:59:59 CEST 2017
IPC: F03D 7/02
F03D 1/02
Applicants: VESTAS WIND SYSTEMS A/S
Inventors: SØRENSEN, Kim Hylling
Title: WIND TURBINE SYSTEM WITH IMPROVED STABILITY DURING SHUTDOWN
Abstract:
The invention relates to a wind turbine system (1) with a plurality of wind turbine modules each with a rotor (7). A control system is arranged to execute a shutdown procedure with a first control command (1CC) for terminating 5 power production from a first subset of wind turbine modules (2', M3, M4) resulting in a thrust force change with a reduced thrust force from the wind on a first part (3') of the support structure carrying the first subset of wind turbine modules (2'). A second control command (2CC) is applied to a second subset of wind turbine modules (2'', M1, M2) for enabling thrust control (TC) of 10 the second subset of wind turbine modules to oppose the thrust force change at the first part ('3). Thus, there is obtained an improved and cost-effective way of stabilizing a wind turbine system with multiple rotors during shutdown.