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Variable-frequency transformer

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A variable frequency transformer is used to transmit electricity between two asynchronous alternating current domains. The VFT is a relatively recent development (first deployed in 2004). Most grid interties use high-voltage direct current converters.

For instance, the Langlois Substation in Québec has installed a 100 MW variable frequency transformer to connect the asynchronous grids in Québec and the northeastern United States.

Smaller VFTs are used in large wind turbines, so that the turbine rotation speed can vary while connected to a distribution grid.

[GE press release for the Langlois installation]

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