Why Synchronous Generation?

Grid-Friendly Synchronous Generator

Thanks to the constant input from Windflow's proprietary Torque-Limiting Gearbox, all Windflow turbines utilize an off-the-shelf synchronous generator synchronised directly to the grid. This avoids the need for complex and expensive power electronics and voltage support equipment, and allows the electricity generated to be fed directly into the electricity network. Beyond reducing costs and increasing reliability, this feature allows for easier connection to the grid. Active and reactive power can be managed over a wide range, as shown in the accompanying generator capability chart.

Active and reactive power can be managed over a wide range, as shown in the accompanying generator capability chart. Please note, that no filtering or reactive power compensation is required.

For more information please see Grid stability with renewables? Yes, Wind can! - Windflow’s power-train and its synchronous generator provide physical inertia for instantaneous grid stability.

Torque-Limiting Gearbox™

As the Teeter Control System™ provides a passive means of mitigating rotor imbalance loads, so does Windflow’s patented Torque Limiting Gearbox™ (TLG) provide a passive mechanical means of removing torque transients from the power-train. The TLG provides near-instantaneous response to torque transients, whether induced by the wind or by electrical grid disturbances, thereby reducing torsional fatigue and impact loads throughout the power-train. This results in a highly reliable, low maintenance turbine.

The TLG has two output shafts. The majority of the wind power captured by the rotor is transmitted through to the main output shaft, which drives a synchronous generator, synchronized to the grid at 1500/1800 RPM.  

The second output shaft drives a low-inertia torque limiting pump. This pump energizes a proprietary hydraulic subsystem which manages any rapid fluctuations in the input wind power by a combination of storage and dissipation means. The TLG protects the power-train from torsional impact and fatigue and enables the use of a synchronous generator directly on line.

Windflow’s proprietary Low Variable Speed™ system enables the rotor of Windflow turbines to run 25% slower than the rated wind speed while maintaining the output shaft speed constant. This improves aerodynamic efficiency and turbine output at lower wind speeds, enables cut-in at lower wind speeds, and reduces blade tip noise in low wind conditions.