Existing AC grids would still transmit electricity over shorter domestic distances, but be upgraded to smart grids.

This drawback was corrected in the Scherbius drive where the slip power is fed back to the AC grid by motor generator sets.

Another concept using static frequency converter had a cycloconverter connected between the rotor and the AC grid.

The 50 Hz (60 Hz in North America) AC grid was already established at the beginning of the 20th century.

In 1892, he published a study on the coupling of synchronous generators on a large AC electric grid.

A DC link stabilizes the AC grids at either end, since power flow and phase angle can be controlled independently.

It is a 0.85 ton solar powered air conditioner with a charging option for both the solar and AC grid.

Nonetheless it is operated as an independent AC grid for physical reasons.

However, there are some lines of this type for lower voltages, for example, towers used by both railway traction power circuits and the general three-phase AC grid.

Asynchronous induction machines can be made so they start and run without any means of control if connected to an AC grid, but the starting torque is low.