Patents by Inventor Alejandro RUJAS

Alejandro RUJAS 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).

  • Back-up energy storage with in-rush current limiting for wind turbine pitch drive
    Patent number: 9793756
    Abstract: A wind turbine pitch drive system comprises an electric grid for supplying electrical power, a motor for driving a pitch actuator, an electronic converter for controlling the motor and a back-up energy storage unit for supplying electrical power. The electronic converter comprises a DC-link capacitor bank. The system furthermore comprises a switching device for selectively connecting the DC-capacitor bank link to the back-up energy storage unit, and a frequency generator for controlling the switching device. Also disclosed is a method for protecting a component of the electronic converter.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: October 17, 2017
    Assignee: ALSTOM Renewable Technologies
    Inventors: Pedro Palomares Rentero, Alejandro Rujas, Héctor Ortiz De Landazuri
  • PITCH DRIVE SYSTEMS AND METHODS
    Publication number: 20150008671
    Abstract: A wind turbine pitch drive system comprises an electric grid for supplying electrical power, a motor for driving a pitch actuator, an electronic converter for controlling the motor and a back-up energy storage unit for supplying electrical power. The electronic converter comprises a DC-link capacitor bank. The system furthermore comprises a switching device for selectively connecting the DC-capacitor bank link to the back-up energy storage unit, and a frequency generator for controlling the switching device. Also disclosed is a method for protecting a component of the electronic converter.
    Type: Application
    Filed: July 1, 2014
    Publication date: January 8, 2015
    Inventors: Pedro PALOMARES RENTERO, Alejandro RUJAS, Héctor ORTIZ DE LANDAZURI