公开(公告)号：US20200011297A1

公开(公告)日：2020-01-09

申请号：US16504090

申请日：2019-07-05

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Jesper HILLEBRANDT ,  Philip Carne Kjær

IPC: F03D7/04 ,  F03D7/02 ,  H02P9/00

Abstract: The invention relates to a method for controlling a wind turbine configured with an on load tap changer transformer which enables adjustment of a current ratio of a primary side current of the transformer and a secondary side current of the transformer. The method comprises detecting that a network voltage on the primary side or secondary side of the transformer is outside a pre-determined voltage range, and in response determining a current reference for the primary side current based on the detected network voltage. The power converter of the wind turbine is controlled to generate an increase of the primary side current towards the current reference, and the current ratio of the transformer is adjusted towards a higher ratio of the current ratio.

公开(公告)号：US20200014317A1

公开(公告)日：2020-01-09

申请号：US16504077

申请日：2019-07-05

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Jesper HILLEBRANDT ,  Philip Carne KJÆR

IPC: H02P13/06 ,  F03D9/25

Abstract: The invention relates to a method for controlling a wind turbine which comprises a transformer has a variable turns ratio such as an on load tap changer transformer. The adjustment of the turns ratio is possible when a primary side current or a secondary side current of the transformer is less than a switching current threshold. The method comprises operating the wind turbine so that the primary or secondary side current is above the switching current threshold. In response to obtaining a condition for changing the turns ratio of the transformer, the wind turbine is operated so that the primary or secondary side current is reduced below the switching current threshold so that the turns ratio can be changed during the temporary current reduction.

公开(公告)号：US20210119562A1

公开(公告)日：2021-04-22

申请号：US17132724

申请日：2020-12-23

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Jesper HILLEBRANDT ,  Philip Carne Kjær

IPC: H02P13/06 ,  F03D9/25

Abstract: The invention relates to a method for controlling a wind turbine which comprises a transformer has a variable turns ratio such as an on load tap changer transformer. The adjustment of the turns ratio is possible when a primary side current or a secondary side current of the transformer is less than a switching current threshold. The method comprises operating the wind turbine so that the primary or secondary side current is above the switching current threshold. In response to obtaining a condition for changing the turns ratio of the transformer, the wind turbine is operated so that the primary or secondary side current is reduced below the switching current threshold so that the turns ratio can be changed during the temporary current reduction.