Windflow’s synchronous power-train

Gallery Windflow’s synchronous power-train 1
Gallery Windflow’s synchronous power-train 1
December 2019
Headquarters Canterbury 8041, New Zealand

Windflow’s synchronous power-train - A torque-limiting gearbox/low variable-speed system for wind turbines

Windflow’s power-train and its synchronous generator enable wind turbines to provide physical inertia and system strength for grid stability.

Windflow's solution is a mechanical Variable Speed (VS) system called the torque-limiting gearbox/low variable-speed (TLG/LVS) system which leaves the generator speed constant (set by the grid) and has a differential (a planetary stage with one input from the wind turbine and two outputs) in the gearbox. One output from the differential drives the generator (constant speed), the other drives a hydraulic pump (variable speed). A hydraulic circuit controls the torque, while the turbine speed is controlled by pitching the blades. Together the hydraulic circuit and the blade-pitch control the power on the generator shaft, enabling it to be synchronous. Thus the important stability benefits of the synchronous generator can be retained while renewable penetration increases.

Key features

  • Avoid CO2 emissions expenses by up to 20%


  • Reduce wind turbine power train capital cost by 5%
  • Savings of US$20,000 per 2 MW turbine

Categories of Application

Company Profile

Maturity Stage

  • Medium and large scale commercialization
  • Small scale commercialization
  • Initial market commercialization
  • Prototype testing in the real world
  • Prototype testing 1:1 in the lab

Looking For

Activity Region

  • /


United Kingdom,


New Zealand,

  • Headquarters
  • Activity

Related Topics

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