Maximization of energy capture of passive, variable-speed wind turbine

This paper shows the development of a passive power limiting technique for variable speed generation. An 80kW Wound-Rotor Induction Generator (WRIG) was utilized to demonstrate this characteristic for wind-turbine generators by both modeling and lab demonstration. First, simulations were used to calculate the rotor impedance values that could set maximized speed-power characteristics for steady-state operation. Second, practical tests were performed and compared to the simulation results after the values were set to maximize speed-power characteristics of the 80kW-WRIG. Finally, another tandem connected WRIG was modeled to extend the wind speed range in addition to the 80kW machine.