| Patent application number | Description | Published |
|---|
| 20100320763 | METHOD FOR DETERMINING A ROTOR POSITION OF AN ELECTRICAL GENERATOR IN A WIND TURBINE - A method for determining a rotor position of an electrical generator in a wind turbine is described comprising determining a voltage of the electrical generator, determining a rotor position angle estimate based on the voltage of the electrical generator, determining a subsequent rotor position angle estimate through a feedback loop, based on a combination of the voltage of the electrical generator and the rotor position angle estimate. Further, a method to real time track encoder health is described comprising determining the phase angle of a reference voltage, determining the angle difference between the rotor position and the reference voltage, and determining the differentiation of the angle difference. | 12-23-2010 |
| 20110106325 | CONTROLLER ARRANGEMENT OF AN ELECTRICAL POWER TRANSFER SYSTEM OF A WIND TURBINE - A controller arrangement of an electrical power transfer system ( | 05-05-2011 |
| 20110109279 | METHOD FOR DETERMINING A ROTOR POSITION OF AN ELECTRICAL GENERATOR IN A WIND TURBINE - A method for determining a rotor position of an electrical generator in a wind turbine is described comprising determining a voltage of the electrical generator, determining a rotor position angle estimate based on the voltage of the electrical generator, determining a subsequent rotor position angle estimate through a feedback loop, based on a combination of the voltage of the electrical generator and the rotor position angle estimate. Further, a method to real time track encoder health is described comprising determining the phase angle of a reference voltage, determining the angle difference between the rotor position and the reference voltage, and determining the differentiation of the angle difference. | 05-12-2011 |
| 20110148198 | POWER CONVERSION SYSTEM AND METHOD - A power conversion system for converting electrical power from at least one power source includes a plurality of converter chains which couple the at least one power source to at least one load. At least two of the converter chains comprise an associated dissipating unit. The dissipating units are coupled via at least one switch. A controller is arranged to control the at least one switch to route power to be dissipated from one of the converter chains to the converter chain's associated dissipating unit, or to at least one of the other dissipating units, or to the converter chain's associated dissipating unit and to at least one of the other dissipating units, to cause corresponding dissipation of the power to be dissipated. | 06-23-2011 |
| 20110163544 | METHOD FOR OPERATING A POWER DISSIPATING UNIT IN A WIND TURBINE - A variable speed wind turbine is provided. The wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator wherein the power converter comprises a generator side converter, a grid side converter and a DC (direct current) link therebetween, a power dissipating unit operatively coupled to the DC link and a controller. The controller is adapted to determine a DC link voltage error signal, the DC link voltage error signal being the difference between a function of an actual DC link voltage and a function of a predefined reference DC link voltage, determine a DC link error power based on the DC link voltage error signal, determine a feed forward power and generate a duty ratio for operating the power dissipating unit based on the DC link error power and the feed forward power. | 07-07-2011 |
| 20110163546 | METHOD FOR OPERATING A POWER DISSIPATING UNIT IN A WIND TURBINE - A variable speed wind turbine is provided. The wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator wherein the power converter comprises a generator side converter, a grid side converter and a DC (direct current) link therebetween, a power dissipating unit operatively coupled to the DC link and a controller. The controller is adapted to determine a DC link voltage error signal, the DC link voltage error signal being the difference between a function of an actual DC link voltage and a function of a predefined reference DC link voltage, determine a DC link error power based on the DC link voltage error signal, determine a feed forward power and generate a duty ratio for operating the power dissipating unit based on the DC link error power and the feed forward power. | 07-07-2011 |
