If an asynchronous generator is connected to the grid via a converter, what is the converter's primary function?

• A. Increase generator voltage
• B. Stabilize frequency by running at grid frequency
• C. Adjust grid frequency to permit connection
• D. Store energy

Answer: (C)

The main idea is that the converter between an asynchronous (induction) generator and the grid is there to make the generator’s output compatible with the fixed grid frequency. An induction machine can run at speeds that produce a frequency different from the grid, so the converter processes the generator’s power and returns it to the grid at the proper, grid-following frequency. In other words, its job is to adjust the grid-side frequency (via the power conversion) so the generator can connect safely and feed power, while voltage and reactive power are managed as needed and energy storage isn’t the primary role in this setup.