Doubly fed electrical generators are similar to AC electrical generators, but have additional features which allow them to run at speeds slightly above or below their natural synchronous speed. This is useful for large variable speed wind turbines, because wind speed can change.
Wind turbines use blades to collect the wind's kinetic energy. Wind flows over the blades creating lift (similar to the effect on airplane wings), which causes the blades to turn.
The small wind turbine market, valued at $117. 3 million in 2025, is projected to experience robust growth, exhibiting a Compound Annual Growth Rate (CAGR) of 18% from 2025 to 2033. This expansion is fueled by several key drivers.
Most modern solar panels can withstand winds of up to 140 miles per hour. The strongest winds recorded in the UK have been high up on mountains, so you needn't be too worried.
Instead, bladeless turbines use a duct to capture the wind and force it into a spinning column of air, creating energy. This design is a reflection of the Vortex Wind Turbines, which rely on aeroelastic resonance and vortex shedding to harness energy from an oscillatory movement.