Invention Grant
- Patent Title: Method for controlling a wind turbine during shutdown
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Application No.: US14782272Application Date: 2014-04-22
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Publication No.: US10030630B2Publication Date: 2018-07-24
- Inventor: Keld Hammerum
- Applicant: VESTAS WIND SYSTEMS A/S
- Applicant Address: DK Aarhus N
- Assignee: VESTAS WIND SYSTEMS A/S
- Current Assignee: VESTAS WIND SYSTEMS A/S
- Current Assignee Address: DK Aarhus N
- Agency: Patterson + Sheridan, LLP
- Priority: DK201370224 20130422; GB1308149.2 20130507
- International Application: PCT/DK2014/050104 WO 20140422
- International Announcement: WO2014/173417 WO 20141030
- Main IPC: F03D7/02
- IPC: F03D7/02

Abstract:
A method for controlling a wind turbine during shutdown is disclosed, said wind turbine comprising a rotor carrying at least three wind turbine blades adapted to be pitched individually. A first shutdown strategy is initially selected, and subsequently a second shutdown strategy is selected, the second shutdown strategy ensuring alignment of the pitch angles of the wind turbine blades. The time for switching from the first shutdown strategy to the second shutdown strategy is calculated on the basis of a misalignment of the pitch angles, and in order to align the pitch angles before an estimated point in time where the pitch angles must be aligned, in order to avoid excessive asymmetric loads on the wind turbine blades and/or on the rotor. According to an alternative embodiment, the first shutdown strategy includes moving the wind turbine blades towards a feathered position at identical pitch rates.
Public/Granted literature
- US20160032890A1 METHOD FOR CONTROLLING A WIND TURBINE DURING SHUTDOWN Public/Granted day:2016-02-04
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