In the GridConWiIG project, grid-supporting and grid-forming control strategies for wind turbines with doubly-fed induction generators (DFIG) are being researched. The project is funded by the Federal Ministry for Economic Affairs and Climate Action based on a decision by the German Bundestag. The project coordinator is the Chair of Power Electronics and Electrical Drives at the University of Rostock, with partners Nordex and 50 Hertz Transmission.

The goal of the project is to enable wind turbines with DFIGs to operate under the following grid conditions:

• Direct connection to a stable interconnected grid: This is the current situation in Europe.
• Connection via long overhead lines or cables to a stable interconnected grid: This situation is found in large countries, such as Australia.
• -Stabilization of the interconnected grid by the wind turbine itself: This is becoming increasingly important in Europe as conventional power plants are decommissioned, and the ancillary services previously provided by these power plants need to be taken over by wind turbines.
• Black start and island operation: This is essential for grid restoration without conventional power plants and is also important for non-European countries with weak grids.

The project will investigate not only the behavior of individual wind turbines but also their behavior within wind farms.

At the University of Rostock, grid-supporting and grid-forming control concepts for doubly-fed induction machines are being researched. The desired voltage regulation can be achieved through the rotor-side converter and the DFIG itself, as well as through the grid-side converter or a separate STATCOM converter in the wind farm.