Patents by Inventor Jesper Hillebrandt

Jesper Hillebrandt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11319936
    Abstract: Wind turbine installation (1) comprising a tower (2), a nacelle (3), —a liquid immersed power electrical device (6) having an expansion vessel (7), an air dehydrating breather (8) comprising a moisture absorbing agent (9), and a conduit (10) fluidly connecting the expansion vessel (7) and the air dehydrating breather (8), wherein the wind turbine installation (1) comprises a barrier (11) separating a restricted zone (12) from a non-restricted zone (13) in said wind turbine installation (1), wherein the electrical device (6) is located in the restricted zone (12), wherein the air dehydrating breather (8) is located in the non-restricted zone (12) and wherein the conduit (10) extends through the barrier (11) and a method of maintaining a wind turbine installation (1).
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: May 3, 2022
    Assignee: Vestas Wind Systems A/S
    Inventor: Jesper Hillebrandt
  • Publication number: 20220049684
    Abstract: Wind turbine installation (1) comprising a tower (2), a nacelle (3), —a liquid immersed power electrical device (6) having an expansion vessel (7), an air dehydrating breather (8) comprising a moisture absorbing agent (9), and a conduit (10) fluidly connecting the expansion vessel (7) and the air dehydrating breather (8), wherein the wind turbine installation (1) comprises a barrier (11) separating a restricted zone (12) from a non-restricted zone (13) in said wind turbine installation (1), wherein the electrical device (6) is located in the restricted zone (12), wherein the air dehydrating breather (8) is located in the non-restricted zone (12) and wherein the conduit (10) extends through the barrier (11) and a method of maintaining a wind turbine installation (1).
    Type: Application
    Filed: November 6, 2019
    Publication date: February 17, 2022
    Inventor: Jesper Hillebrandt
  • Publication number: 20210119562
    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.
    Type: Application
    Filed: December 23, 2020
    Publication date: April 22, 2021
    Inventors: Jesper HILLEBRANDT, Philip Carne Kjær
  • Patent number: 10914288
    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.
    Type: Grant
    Filed: July 5, 2019
    Date of Patent: February 9, 2021
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Jesper Hillebrandt, Philip Carne Kjær
  • Patent number: 10910975
    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.
    Type: Grant
    Filed: July 5, 2019
    Date of Patent: February 2, 2021
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Jesper Hillebrandt, Philip Carne Kjær
  • Publication number: 20200014317
    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.
    Type: Application
    Filed: July 5, 2019
    Publication date: January 9, 2020
    Inventors: Jesper HILLEBRANDT, Philip Carne KJÆR
  • Publication number: 20200011297
    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.
    Type: Application
    Filed: July 5, 2019
    Publication date: January 9, 2020
    Inventors: Jesper HILLEBRANDT, Philip Carne Kjær
  • Patent number: 9911528
    Abstract: A transformer assembly for a wind turbine is described. The transformer assembly includes a liquid-filled main transformer and an auxiliary transformer connected on the high-voltage side of the main transformer. The auxiliary transformer benefits from improved power quality in this configuration.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: March 6, 2018
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Jesper Hillebrandt, Frank Schalow