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The US alone has 3 grids (East, West and Texas). With the same frequency but still not connected.

In Switzerland trains use 16.7Hz but they are connected with large frequency inverters. Before it was with large motors / generators. Now its just static with electronic.

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The same frequency, but not connected via AC. There are multiple DC and Variable Frequency Transformer ties between the various interconnections.

https://en.wikipedia.org/wiki/North_American_power_transmiss...

Exactly, DC is used for those links that would otherwise be out of synchronization. In Canada one of the DC links goes from the North American grid on the British Columbia Lower Mainland in Delta via a single underwater cable over to Vancouver Island. The water is the other conductor, and also keeps the cable cool.

We have more than three interconnections that are not in synchronous connection to each other.

They can share power and are somewhat connected with HVDC interconnections however.

Same with mainland Australia and Tasmania with HVDC cable going through the sea.

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