WIND TURBINE WITH LVRT CAPABILITIES

摘要

Systems and methods (“utility”) for providing Low Voltage Ride Through (LVRT) capabilities for wind turbines are disclosed. The utility includes a directly connected synchronous generator (214) that is designed to have a high dynamic pull-out torque. To remain connected to the power grid (224) during low voltage events, the utility boosts the excitation current applied to the rotor of the synchronous generator (214). Further, the utility may include a torque regulator in the form of d torque-regulating gearbox (210), which in turn includes adjustable guide vanes (624) that may be positioned to reduce the amount of mechanical torque applied to the rotor shaft of the synchronous generator (224) during low voltage events. Additionally, the utility may also include a braking system (206) and a pitch control system (234) to limit the acceleration of the wind rotor (202) shaft during low voltage events.