Patents by Inventor John Godsk Nielsen

John Godsk Nielsen 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: 10236687
    Abstract: In a full-scale converter system both the grid-side inverter unit and the generator-side inverter unit have a series convection of parallel inverters and form a generator-side and grid-side voltage-center-point at a voltage level between those of the inverters connected in series. The voltage-center-points are electrically connected by a center-line conductor that has a cross-section between 30% and 70% of that of a positive or negative potential conductor. The converter system continues conversion operation in the event of a fault in an inverter of a first converter-string, with non-faulty inverters of the converter system, as the center-line conductor is dimensioned by said cross-section to carry a compensation current resulting from an unbalanced active power-output.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: March 19, 2019
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: John Godsk Nielsen, Søren Andersen, Lars Helle, Duy Duc Doan
  • Publication number: 20180335017
    Abstract: A method for controlling a wind turbine system including an electrical generator, a power converter system, a DC-link, and at least a grid-side breaker arrangement controllable between open and closed states, wherein the method comprises monitoring for the presence of a shutdown event and, in response to identifying the presence of a shutdown event, controlling the wind turbine into a production-ready state, comprising: i) controlling the grid-side breaker arrangement in the closed state; ii) disabling one or more drive signals to the power converter system; and iii) controlling the DC-link of the power converter system in a charged state. Advantageously, this approach reduces the frequency of use of the grid-side breaker arrangement which extends serviceable life considerably, and also allows the wind turbine system to be transitioned rapidly between an operating state and a production-ready state.
    Type: Application
    Filed: December 1, 2016
    Publication date: November 22, 2018
    Inventors: John Godsk NIELSEN, Duy Duc DOAN, Søren ANDERSEN, Gert Karmisholt ANDERSEN
  • Patent number: 10135354
    Abstract: A method of setting a reference DC-link voltage of a wind-turbine converter system is provided. At least at least one DC voltage demand from at least one generator-side inverter and at least one DC voltage demand are received from at least one grid-side inverter. A generator-side DC voltage demand value on the basis of the at least one DC voltage demand received from the at least one generator-side inverter. Also a grid-side DC voltage demand value is determined on the basis of the at least one DC voltage demand received from the at least one grid-side inverter. The highest DC voltage demand value out of the generator-side and grid-side DC voltage demand values is chosen. This chosen value corresponds to the set reference DC-link voltage.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: November 20, 2018
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Søren Andersen, Gert Karmisholt Andersen, Duy Duc Doan, John Godsk Nielsen
  • Publication number: 20180123470
    Abstract: A method of controlling a full-scale converter system in which both the grid-side inverter unit and the generator-side inverter unit have a series-connection of parallel inverters and form a generator-side and grid-side voltage-center-point at a voltage level between the inverters connected in series. The voltage-center-points are electrically connected by a center-line conductor. Conversion operation with a de-rated maximum active power-output is performed in response to at least one of (i) the grid-side inverter and (ii) the generator-side inverter of the first converter-string being disabled, by disabling active power production of at least one of (i) the grid-side inverter and (ii) the generator-side inverter of the second converter-string, or correspondingly reducing active power production of the second converter-string, thereby preventing a compensation current along the center-line conductor.
    Type: Application
    Filed: April 11, 2016
    Publication date: May 3, 2018
    Inventors: John Godsk NIELSEN, Søren ANDERSEN, Lars HELLE, Duy Duc DOAN
  • Publication number: 20180115163
    Abstract: In a full-scale converter system both the grid-side inverter unit and the generator-side inverter unit have a series convection of parallel inverters and form a generator-side and grid-side voltage-center-point at a voltage level between those of the inverters connected in series. The voltage-center-points are electrically connected by a center-line conductor that has a cross-section between 30% and 70% of that of a positive or negative potential conductor. The converter system continues conversion operation in the event of a fault in an inverter of a first converter-string, with non-faulty inverters of the converter system, as the center-line conductor is dimensioned by said cross-section to carry a compensation current resulting from an unbalanced active power-output.
    Type: Application
    Filed: April 11, 2016
    Publication date: April 26, 2018
    Inventors: John Godsk NIELSEN, Søren ANDERSEN, Lars HELLE, Duy Duc DOAN
  • Publication number: 20170373625
    Abstract: A method of monitoring a split wind-turbine-converter system with at least one generator-side converter and at least one grid-side converter arranged at distant locations, and a DC-link in the form of an elongated conductor arrangement with at least one positive and at least one negative conductor. The impedance of the DC-link conductor arrangement is determined by means of DC-voltage sensors. The voltages between the positive and the negative conductors are determined at the generator-side converter and at the grid-side converter, and the difference between the voltages is determined. The impedance of the DC-link conductor arrangement is determined by putting the determined voltage difference in relation to the DC current flowing through the DC-link conductor arrangement. If the impedance exceeds a given impedance threshold a fault state is recognized.
    Type: Application
    Filed: January 6, 2016
    Publication date: December 28, 2017
    Inventors: Søren ANDERSEN, John Godsk NIELSEN, Duy Duc DOAN
  • Publication number: 20170358997
    Abstract: A method of setting a reference DC-link voltage of a wind-turbine converter system is provided. At least at least one DC voltage demand from at least one generator-side inverter and at least one DC voltage demand are received from at least one grid-side inverter. A generator-side DC voltage demand value on the basis of the at least one DC voltage demand received from the at least one generator-side inverter. Also a grid-side DC voltage demand value is determined on the basis of the at least one DC voltage demand received from the at least one grid-side inverter. The highest DC voltage demand value out of the generator-side and grid-side DC voltage demand values is chosen. This chosen value corresponds to the set reference DC-link voltage.
    Type: Application
    Filed: December 8, 2015
    Publication date: December 14, 2017
    Inventors: Søren ANDERSEN, Gert Karmisholt ANDERSEN, Duy Duc DOAN, John Godsk NIELSEN
  • Publication number: 20170331295
    Abstract: A wind turbine converter system with a rectifier and an inverter and a converter controller has at least first and second converter strings. The converter system is controlled by a master-converter controller and a slave-converter controller. The master-converter controller controls the first converter string and the slave-converter controller controls the second converter string. The master-converter controller receives commands from a superordinate wind turbine controller, provides the slave-converter controller with string-control commands on the basis of the superordinate control commands, and controls the conversion operation of the first converter string on the basis of the superordinate control command. The slave-converter controller receives the string-control commands from the master-converter controller and controls the conversion operation of the second converter string on the basis of the string-control commands received.
    Type: Application
    Filed: October 19, 2015
    Publication date: November 16, 2017
    Inventors: Tusitha ABEYASEKERA, Duy Duc DOAN, Lars HELLE, Søren ANDERSEN, John Godsk NIELSEN
  • Publication number: 20170244251
    Abstract: The present invention relates to a method for operating a wind power facility in order to provide reactive power support to a power grid, the method comprising the step of increasing an amount of reactive power injected into the power grid, decreasing an amount of active power injected into the power grid by a certain amount, and dissipating and/or storing essentially said certain amount of active power in power dissipation and/or power storage means. The wind power facility may comprise a wind turbine or a wind power plant.
    Type: Application
    Filed: September 22, 2015
    Publication date: August 24, 2017
    Inventors: John Godsk NIELSEN, Søren ANDERSEN, Duy Duc DOAN, Lars HELLE
  • Patent number: 9722416
    Abstract: According to an embodiment, a power generation system is provided comprising a power generator; a plurality of converter modules, each converter module having a DC link, wherein the DC link of each converter module is connected to the DC links of the other converter modules of the plurality of converter modules via a fuse associated with the converter module; and a controller configured to, if it is detected that there is a fault in one of the converter modules, disconnect the converter module in which there is a fault from the power generator and connect two or more other converters module of the plurality of converter modules to the power generator and to control the power generation system to supply power to the DC links of the two or more other converter modules such that power is supplied to the converter module in which there is a fault via the fuse associated with the converter module such that the fuse associated with the converter module melts.
    Type: Grant
    Filed: July 11, 2012
    Date of Patent: August 1, 2017
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: John Godsk Nielsen, Ove Styhm
  • Publication number: 20170211546
    Abstract: The present invention relates to a method for shutting down a wind power facility, said wind power facility comprising a power generator, a power converter comprising generator side and grid side converters being separated by an intermediate DC circuit, and power dissipation or power storage means being operatively connected to the intermediate DC circuit, the method comprising the steps of determining that the wind power facility needs to be shut down, and operating the generator side converter in accordance with a load time curve during shutdown of the wind power facility in order to avoid overloading of selected generator side converter components and the power dissipation or power storage means. Moreover, the present invention relates to a wind power facility for performing this method.
    Type: Application
    Filed: July 2, 2015
    Publication date: July 27, 2017
    Inventors: Duy Duc DOAN, John Godsk NIELSEN, Per BISGAARD
  • Patent number: 9702908
    Abstract: A method for operating a power generation system coupled to a power grid during a grid unbalance event, a method for determining an injection current to be supplied into a power grid by a power generation system, and a method for addressing an asymmetric grid fault in a power grid connected to a power generation system are provided. The methods may be carried out based on a reactive or an active power/current priority.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: July 11, 2017
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Amit Kumar Gupta, John Godsk Nielsen, Liang Yang
  • Publication number: 20160241153
    Abstract: A wind turbine generator 1 supplies three-phase a.c. current of variable voltage and variable frequency to two pairs of rectifiers 4a, 4b and 4c, 4d which generate respective d.c. outputs connected to positive, negative and neutral d.c. conductors 6, 7, 8. The outputs from each pair of rectifiers are connected together, and the outputs from the two pairs are connected in series to create a high-voltage d.c. output. Inverters 10a, 10b, 10c, 10d then convert the d.c. power to a.c. at a fixed frequency and voltage suitable for In connection to the mains grid. To reduce the effect of common-mode noise, a capacitor is connected between the 1 neutral conductor 7 and earth, and a respective filter circuit 30 is connected between each of the a.c. outputs of the inverters 10a, 10b, 10c, 10d and earth. To reduce the effect of voltage surges during lightning, a surge protection device is also connected between the neutral d.c. conductor 7 and earth.
    Type: Application
    Filed: October 14, 2014
    Publication date: August 18, 2016
    Inventors: Tusitha ABEYASEKERA, Duy Duc DOAN, Lars HELLE, Allan Holm JØRGENSEN, John Godsk NIELSEN, Søren ANDERSEN
  • Publication number: 20160231365
    Abstract: A method for operating a power generation system coupled to a power grid during a grid unbalance event, a method for determining an injection current to be supplied into a power grid by a power generation system, and a method for addressing an asymmetric grid fault in a power grid connected to a power generation system are provided. The methods may be carried out based on a reactive or an active power/current priority.
    Type: Application
    Filed: February 4, 2016
    Publication date: August 11, 2016
    Inventors: Amit Kumar GUPTA, John Godsk NIELSEN, Liang YANG
  • Patent number: 9291152
    Abstract: A method for operating a power generation system coupled to a power grid during a grid unbalance event, a method for determining an injection current to be supplied into a power grid by a power generation system, and a method for addressing an asymmetric grid fault in a power grid connected to a power generation system are provided. The methods may be carried out based on a reactive or an active power/current priority.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: March 22, 2016
    Assignee: Vestas Wind Systems A/S
    Inventors: Amit Kumar Gupta, John Godsk Nielsen, Liang Yang
  • Patent number: 8898025
    Abstract: Method, system, and computer readable medium for determining a fault in a power filter of a wind turbine generator. The method may include the steps of calculating a reactive power consumed by the power filter, and comparing the calculated reactive power to a predefined threshold reactive power to determine the fault.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: November 25, 2014
    Assignee: Vestas Wind Systems A/S
    Inventors: Bo Yin, John Godsk Nielsen, Kim B. Larsen, Ove Styhm, Kheng Hong Ang
  • Publication number: 20140192570
    Abstract: According to an embodiment, a power generation system is provided comprising a power generator; a plurality of converter modules, each converter module having a DC link, wherein the DC link of each converter module is connected to the DC links of the other converter modules of the plurality of converter modules via a fuse associated with the converter module; and a controller configured to, if it is detected that there is a fault in one of the converter modules, disconnect the converter module in which there is a fault from the power generator and connect two or more other converters module of the plurality of converter modules to the power generator and to control the power generation system to supply power to the DC links of the two or more other converter modules such that power is supplied to the converter module in which there is a fault via the fuse associated with the converter module such that the fuse associated with the converter module melts.
    Type: Application
    Filed: July 11, 2012
    Publication date: July 10, 2014
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: John Godsk Nielsen, Ove Styhm
  • Publication number: 20130264824
    Abstract: A method for operating a power generation system coupled to a power grid during a grid unbalance event, a method for determining an injection current to be supplied into a power grid by a power generation system, and a method for addressing an asymmetric grid fault in a power grid connected to a power generation system are provided. The methods may be carried out based on a reactive or an active power/current priority.
    Type: Application
    Filed: November 10, 2011
    Publication date: October 10, 2013
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Amit Kumar Gupta, John Godsk Nielsen, Liang Yang
  • Patent number: 8041466
    Abstract: The invention relates to a method for operating a wind turbine connected to a utility grid during a utility grid disturbance. The method comprises the steps of controlling active current in dependency of the frequency deviation from a reference frequency, and controlling reactive current in dependency of the voltage deviation from a reference voltage. The invention also relates to a wind turbine and wind park.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: October 18, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Lars Helle, John Godsk Nielsen, Mark James Jensen
  • Publication number: 20110106470
    Abstract: Method, system, and computer readable medium for determining a fault in a power filter of a wind turbine generator. The method may include the steps of calculating a reactive power consumed by the power filter, and comparing the calculated reactive power to a predefined threshold reactive power to determine the fault.
    Type: Application
    Filed: August 20, 2010
    Publication date: May 5, 2011
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Bo Yin, John Godsk Nielsen, Kim B. Larsen, Ove Styhm, Kheng Hong Ang