Technologies
PDF


WARF: P06426US

Power Conditioning Architecture for Wind Turbine


INVENTORS -

Venkata Giri Venkataramanan, Patrick Flannery

The Wisconsin Alumni Research Foundation (WARF) is seeking commercial partners interested in developing a method that allows DFIG wind turbines connected to the utility grid to ride through a voltage sag.
OVERVIEWWind-powered generators are an increasing source of power for many countries. However, before their use can become widespread, they must be able to work effectively with the existing utility grid.

Voltage sags and other disturbances can occur during grid faults. But the conventional electrical architecture for doubly fed induction generator (DFIG) wind turbines fails during extreme voltage sags, and existing patchwork solutions are not effective or economical.
THE INVENTIONUW-Madison researchers have developed a viable solution that allows DFIG wind turbines connected to the grid to ride through a voltage sag. The turbines need converters, such as a DC/AC inverter, to change the power generated into a form that is compatible with the utility grid. In a conventional DFIG wind turbine, the grid-side converter is connected in parallel with the stator windings of the generator. This approach has the converter connected in series instead. The DC voltage bus of the converter is fed from the induction generator rotor windings through a second, machine-side converter. Connecting the grid-side converter in series allows continuous control of shaft torque and power delivered to the grid even during grid faults, enabling inherent voltage sag ride-through capability.
APPLICATIONS
  • Wind-powered generators
KEY BENEFITS
  • Maintains connection to the grid and control of torque and current, even during grid faults
  • Enables wind turbine power generation to conform to utility system operating requirements
  • Allows wind turbine generators to effectively interface with the utility grid
  • Operation of both converters is coordinated to control wind turbine rotor speed for maximum power extraction and efficiency.
Contact Information
For current licensing status, please contact Emily Bauer at emily@warf.org or 608-960-9842.
The WARF Advantage

Since its founding in 1925 as the patenting and licensing organization for the University of Wisconsin-Madison, WARF has been working with business and industry to transform university research into products that benefit society. WARF intellectual property managers and licensing staff members are leaders in the field of university-based technology transfer. They are familiar with the intricacies of patenting, have worked with researchers in relevant disciplines, understand industries and markets, and have negotiated innovative licensing strategies to meet the individual needs of business clients.