Variable frequency transformers provide transmission solutions for a smarter grid, enabling transmission system operators to control power flows between power grids with high reliability, speed and efficiency, while offering flexibility in how utilities provide power to meet customers’ demand.
The VFT system is based on a combination of hydro generator and transformer technologies. It consists of a rotary transformer for continuously controllable phase shift, together with a drive system and control that adjust the angle and speed of the rotary transformer to regulate the power flow through the VFT.
The VFT system provides a means to control power between two grids. The grids need not be synchronous. A common situation is where two grids of the same nominal frequency cannot economically be directly connected with AC lines. The VFT allows controlled power exchange between the grids, while retaining many of the inherent virtues of an AC interconnection.
The simple design of the VFT components, based on established and widely used rotating machinery, ensures its long-term maintainability.
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