Patents by Inventor Lars Helle

Lars Helle 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).

  • Publication number: 20220311354
    Abstract: This disclosure proposes procedures and systems for discharging system capacitors and de-energizing power transmission systems having Modular Multilevel Converter (MMC) topologies by intelligent control of MMC cell components including configuration of bypass and insert switches using integrated DC choppers to effectively de-energize MMC cell capacitors and/or DC-link capacitors under operating conditions such as after a normal stop, for protection against over-voltages, dumping turbine energy, and under certain hardware fault conditions.
    Type: Application
    Filed: August 12, 2020
    Publication date: September 29, 2022
    Inventors: Cem Özgür GERÇEK, Lars HELLE, Ciprian BIRIS
  • Patent number: 11453868
    Abstract: The present invention relates to variants of an alpha-amylase having improved stability to chelating agents relative to its parent enzyme, compositions comprising the variants, nucleic acids encoding the variants, methods of producing the variants, and methods for using the variants.
    Type: Grant
    Filed: March 17, 2021
    Date of Patent: September 27, 2022
    Assignee: NOVOZYMES A/S
    Inventors: Allan Svendsen, Annette Helle Johansen, Mads Bjoernvad, Frank W. Rasmussen, Michael Skjoet, Signe Eskildsen Larsen, Jens Oebro, Svend Kaasgaard, Lars Beier
  • Patent number: 11447723
    Abstract: The present invention relates to polypeptide variants and methods for obtaining variants. The present invention also relates to polynucleotides encoding the variants; nucleic acid constructs, vectors, and host cells comprising the polynucleotides; and methods of using the variants.
    Type: Grant
    Filed: August 5, 2020
    Date of Patent: September 20, 2022
    Assignee: NOVOZYMES A/S
    Inventors: Lars Beier, Lars Henrik Oestergaard, Annette Helle Johansen, Klaus Gori, Thomas Holberg Blicher, Gernot Abel, Steen Krogsgaard, Jens E. Nielsen, Lars Giger
  • Patent number: 11441136
    Abstract: The present invention relates to polypeptide variants and methods for obtaining variants. The present invention also relates to polynucleotides encoding the variants; nucleic acid constructs, vectors, and host cells comprising the polynucleotides; and methods of using the variants.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: September 13, 2022
    Assignee: Novozymes A/S
    Inventors: Lars Henrik Oestergaard, Lars Giger, Annette Helle Johansen, Lars Beier, Jurgen Carsten Franz Knotzel, Gernot J. Abel, Klaus Gori
  • Publication number: 20220282187
    Abstract: Detergent compositions including polypeptide variants and methods of cleaning and/or treatment of surfaces using such compositions, and fabric treatment compositions including polypeptide variants. The compositions may include surfactants: anionic, nonionic and/or cationic.
    Type: Application
    Filed: May 3, 2022
    Publication date: September 8, 2022
    Inventors: Lars BEIER, Lars Henrik OESTERGAARD, Annette Helle JOHANSEN, Klaus GORI, Thomas Holberg BLICHER, Gernot J. ABEL, Steen KROGSGAARD, Jens E NIELSEN, Lars GIGER, Neil Joseph LANT
  • Publication number: 20220278604
    Abstract: According to embodiments described herein a Modular Multilevel Converter (MMC) is pre-charged by: driving a bypass current from an auxiliary power source through a plurality of bypass switches included in a corresponding plurality of cells; in response to a summed voltage across a plurality of cell capacitors included in the plurality of cells satisfying a drive threshold, driving an insert current through a plurality of insert switches included in the plurality of cells; and in response to a voltage across a Direct Current (DC) link capacitor satisfying a pre-charge threshold when driving the insert current, opening a circuit breaker connecting the auxiliary power source with the plurality of cells and connecting a generator with external power line rails between which the DC link capacitor is connected.
    Type: Application
    Filed: September 17, 2020
    Publication date: September 1, 2022
    Inventors: Masoud PARKHOU, Lars HELLE, Cem Özgür GERÇEK
  • Patent number: 11365721
    Abstract: The present invention relates to wind energy park connected to an electrical grid, having airborne wind energy systems (AWES), e.g. with kites. The wind energy park has an electrical DC network connecting the plurality of AWES and a grid converter unit for converting DC to AC, and transmit AC to the electrical grid. The wind energy park control unit controls the AWES to produce electrical power to the electrical grid by alternating between a power production phase, and a recovery phase so to balance the supply of power to the electrical grid according a demanded setpoint. An advantage is that the grid converter may be smaller, as compared to an AC network, because the power is evened out with the negative power from the AWES being in recovery phase. In this way, the invention stabilizes the grid and has a grid forming capability.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: June 21, 2022
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Morten Lindholm, Thomas S. Bjertrup Nielsen, Torben Petersen, Lars Helle
  • Publication number: 20220123667
    Abstract: This disclosure proposes a topology that integrates a DC chopper into the Modular Multilevel Converter (MMC) cells of a power converter. The integrated DC chopper may include chopper resistors that may also be advantageously integrated into a heat sink for a power module comprising at least the power transistors of the MMC cell. Embodiments herein also describe a method for using an MMC cell's IGBTs and chopper resistors for providing a safe discharge of both cell capacitors and DC-link capacitors in different operating conditions.
    Type: Application
    Filed: December 27, 2021
    Publication date: April 21, 2022
    Inventors: Ciprian BIRIS, Cem Özgür GERÇEK, Lars HELLE, Duy Duc DOAN, Tune PEDERSEN
  • Patent number: 11286904
    Abstract: A method for use in controlling a wind turbine generator of a wind power plant based on a condition of a power converter or a component forming part of a power converter in the wind power plant. The method comprises determining the initial condition of the power converter or a component forming part of a power converter and determining the evolution of the condition from the initial condition based on notional power reference values of the wind turbine generator. The method further comprises comparing the evolution of the condition to a predetermined threshold and determining, from the comparison, a time period by which the condition of the power converter or a component forming part of a power converter will substantially equal the predetermined threshold.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: March 29, 2022
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Gert Karmisholt Andersen, Lars Helle, Poul Møhl Dyrlund, Morteza Rabi, Duy Duc Doan
  • Patent number: 11258345
    Abstract: The present invention relates to a method for simultaneous operation of a plurality of chopper circuits of a wind turbine power converter, the method comprising the steps of operating a controllable switching member of a first chopper circuit in accordance with a first switching pattern, and operating a controllable switching member of a second chopper circuit in accordance with a second switching pattern, wherein the first switching pattern is different from the second switching pattern during a first time period. In order to reduce switching losses the first switching pattern may involve that the controllable switching member of the first chopper circuit is clamped during the first time period. Additional chopper circuits may be provided in parallel to the first and second chopper circuits. The present invention further relates to a power dissipation chopper being operated in accordance with the before mentioned method.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: February 22, 2022
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Lars Helle, Torsten Lund
  • Patent number: 11211878
    Abstract: A Direct Current (DC) chopper may be integrated into the Modular Multilevel Converter (MMC) cells of a power converter. The integrated DC chopper may include chopper resistors that may also be advantageously integrated into a heat sink for a power module including at least the power transistors of the MMC cell. The safe discharge of both cell capacitors and DC-link capacitors in different operating conditions is performed using Insulated-Gate Bipolar Transistors (IGBTs) and chopper resistors of an MMC cell.
    Type: Grant
    Filed: August 12, 2020
    Date of Patent: December 28, 2021
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Ciprian Biris, Cem Özgür Gerçek, Lars Helle, Duy Duc Doan, Tune Pedersen
  • Patent number: 11156207
    Abstract: The present invention relates to operation of a wind turbine using a power storage unit, such as a rechargeable battery, to power a group of power consuming units during grid loss. The wind turbine comprises a number of power consuming units being grouped into at least a first group and a second group, a first electrical converter for connecting the generator to the electrical grid, and a second electrical converter for connecting the electrical generator to the power storage unit. Upon detecting an occurrence of the grid loss, the generator is operated to ensure sufficient power of the power storage unit to operate the first group of power consuming units.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: October 26, 2021
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Torben Møller Hansen, Niels Erik Danielsen, Tusitha Abeyasekera, Lars Helle, Ghada Ali Diaa Hillawi, Laurids Givskov Jørgensen, Paw Rosenvard
  • Patent number: 11098694
    Abstract: A method for use in controlling a wind turbine generator based on a condition of a power converter or a component forming part of a power converter in the wind turbine generator. The method comprises determining a condition of the power converter or the component forming part of a power converter, then comparing the condition to a predetermined threshold and modifying an operational parameter of the wind turbine generator if the condition substantially equals or exceeds the predetermined threshold. In particular, the invention proposes the wind turbine generator is derated if the condition of the power converter or the component forming part of a power converter substantially equals or exceeds the predetermined threshold.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: August 24, 2021
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Gert Karmisholt Andersen, Lars Helle, Morteza Rabi, Poul Møhl Dyrlund
  • Publication number: 20210050796
    Abstract: This disclosure proposes a topology that integrates a DC chopper into the Modular Multilevel Converter (MMC) cells of a power converter. The integrated DC chopper may include chopper resistors that may also be advantageously integrated into a heat sink for a power module comprising at least the power transistors of the MMC cell. Embodiments herein also describe a method for using an MMC cell's IGBTs and chopper resistors for providing a safe discharge of both cell capacitors and DC-link capacitors in different operating conditions.
    Type: Application
    Filed: August 12, 2020
    Publication date: February 18, 2021
    Inventors: Ciprian BIRIS, Cem Özgür GERÇEK, Lars HELLE, Duy Duc DOAN, Tune PEDERSEN
  • Patent number: 10914283
    Abstract: Aspects of the present disclosure are generally directed to configurations of power conversion systems for wind turbine generators. For example, certain aspects are directed to a multi-rotor wind turbine. The multi-rotor wind turbine generally includes a plurality of rotors, each coupled to a plurality of electrical generators, one or more machine-side converters, MSCs, coupled to the electrical generators of each of the plurality of rotors and configured to generate at least one direct-current, DC, signal, and one or more line-side converters, LSCs, coupled to the MSCs and configured to generate at least one AC signal based on the at least one DC signal.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: February 9, 2021
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Søren Viisholm Trankjær, Lars Helle, Torben Petersen
  • Publication number: 20210033069
    Abstract: The present invention relates to wind energy park connected to an electrical grid, having airborne wind energy systems (AWES), e.g. with kites. The wind energy park has an electrical DC network connecting the plurality of AWES and a grid converter unit for converting DC to AC, and transmit AC to the electrical grid. The wind energy park control unit controls the AWES to produce electrical power to the electrical grid by alternating between a power production phase, and a recovery phase so to balance the supply of power to the electrical grid according a demanded setpoint. An advantage is that the grid converter may be smaller, as compared to an AC network, because the power is evened out with the negative power from the AWES being in recovery phase. In this way, the invention stabilizes the grid and has a grid forming capability.
    Type: Application
    Filed: January 22, 2019
    Publication date: February 4, 2021
    Inventors: Morten LINDHOLM, Thomas S. Bjertrup NIELSEN, Torben PETERSEN, Lars HELLE
  • Publication number: 20200392942
    Abstract: A method for use in controlling a wind turbine generator of a wind power plant based on a condition of a power converter or a component forming part of a power converter in the wind power plant. The method comprises determining the initial condition of the power converter or a component forming part of a power converter and determining the evolution of the condition from the initial condition based on notional power reference values of the wind turbine generator. The method further comprises comparing the evolution of the condition to a predetermined threshold and determining, from the comparison, a time period by which the condition of the power converter or a component forming part of a power converter will substantially equal the predetermined threshold.
    Type: Application
    Filed: December 5, 2018
    Publication date: December 17, 2020
    Inventors: Gert Karmisholt ANDERSEN, Lars HELLE, Poul Møhl DYRLUND, Morteza RABI, Duy Duc DOAN
  • Publication number: 20200362823
    Abstract: The present invention relates to a method for simultaneous operation of a plurality of chopper circuits of a wind turbine power converter, the method comprising the steps of operating a controllable switching member of a first chopper circuit in accordance with a first switching pattern, and operating a controllable switching member of a second chopper circuit in accordance with a second switching pattern, wherein the first switching pattern is different from the second switching pattern during a first time period. In order to reduce switching losses the first switching pattern may involve that the controllable switching member of the first chopper circuit is clamped during the first time period. Additional chopper circuits may be provided in parallel to the first and second chopper circuits. The present invention further relates to a power dissipation chopper being operated in accordance with the before mentioned method.
    Type: Application
    Filed: November 30, 2018
    Publication date: November 19, 2020
    Inventors: Lars HELLE, Torsten LUND
  • Patent number: 10763670
    Abstract: Aspects of the present disclosure are generally directed to using a rotary transformer to transfer power for a wind turbine generator. Certain aspects of the present disclosure are directed to a multi-rotor wind turbine. The multi-rotor wind turbine generally includes a plurality of rotors, a plurality of electrical generators, each coupled to one of the plurality of rotors, and one or more rotary transformers configured to transfer power between the electrical generators and a power grid. In some aspects, each rotary transformer comprises a first winding coupled to one or more electrical generators of the plurality of electrical generators, and a second winding magnetically coupled to the first winding and coupled to the power grid, wherein the first winding is rotatable with respect to the second winding.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: September 1, 2020
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Søren Viisholm Trankjær, Lars Helle, Torben Petersen
  • Patent number: 10700624
    Abstract: A method of controlling a wind turbine generator (1) comprising an electrical generator (10) and a power converter (12), the power converter (12) comprising an electrical switch (14a, 14b) that is configured to process electrical power produced by the electrical generator (10), the method comprising: controlling an output from the electrical switch (14a, 14b) using a variable pulse-width modulated control signal, thereby to control characteristics of output power from the power converter (12); acquiring sample data (26) relating to an electronic signal within the wind turbine generator (1), wherein the sample data (26) is used for controlling the wind turbine generator (1); and dynamically adjusting a frequency (30) at which the sample data is acquired to synchronise data acquisition with a carrier frequency (24) of the control signal.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: June 30, 2020
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Gert Karmisholt Andersen, Kent Tange, Søren Andersen, Duy Duc Doan, Jens Peter Biltoft, Lars Helle, John Godsk Nielsen