Patents by Inventor Karthik Palaniappan

Karthik Palaniappan 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).

  • Grid-connected power converter control
    Patent number: 10862332
    Abstract: For grid-connected power converter control, a method estimates a d-axis grid voltage from a d-axis reference current modified with a d-axis current, and a q-axis current modified with a filter inductive reactance. The method generates a q-axis grid voltage from a direct current (DC) voltage input modified with the DC bus voltage modified with a notch filter to balance the voltage input and further reduced with the q-axis current. The method modifies the estimated d-axis grid voltage and the q-axis grid voltage by selectively removing second-order harmonics. The method further determines a d-axis voltage output and a q-axis voltage output as a function of the modified estimated d-axis grid voltage and the modified q-axis grid voltage.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: December 8, 2020
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Lei Jin, Haihui Lu, Karthik Palaniappan, Ahmed S. Mohamed Sayed Ahmed
  • GRID-CONNECTED POWER CONVERTER CONTROL
    Publication number: 20200303943
    Abstract: For grid-connected power converter control, a method estimates a d-axis grid voltage from a d-axis reference current modified with a d-axis current, and a q-axis current modified with a filter inductive reactance. The method generates a q-axis grid voltage from a direct current (DC) voltage input modified with the DC bus voltage modified with a notch filter to balance the voltage input and further reduced with the q-axis current. The method modifies the estimated d-axis grid voltage and the q-axis grid voltage by selectively removing second-order harmonics. The method further determines a d-axis voltage output and a q-axis voltage output as a function of the modified estimated d-axis grid voltage and the modified q-axis grid voltage.
    Type: Application
    Filed: March 19, 2019
    Publication date: September 24, 2020
    Inventors: Lei Jin, Haihui Lu, Karthik Palaniappan, Ahmed S. Mohamed Sayed Ahmed