A device that allows an ASYNCHRONOUS generator to connect to the grid is called what?

• A. Frequency converter
• B. Contactor
• C. Inverter
• D. Transformer

Answer: (A)

To connect an asynchronous (induction) generator to the grid, you need a device that brings the generator’s variable output in line with the grid’s fixed frequency, voltage, and phase. A frequency converter does exactly this: it takes the generator’s variable-frequency power and converts it into grid-synchronous power, typically through a rectifier and inverter with a DC link, ensuring proper synchronization before feeding the grid.

A transformer changes voltage levels but does not fix the frequency, so it can’t alone enable a grid connection for a variable-frequency source. A contactor is only a switch to connect or disconnect the circuit. An inverter can generate grid-compatible AC from DC, but the most direct and comprehensive term for matching an asynchronous generator to the grid is a frequency converter, which handles both frequency and overall power conditioning for grid connection.