Abstract
In a world widely using wind turbines, the frequency converter is connected with the generator to obtain power grid-connected frequency, which makes their electric power quality weaker than that of conventional synchronous generators. Some researches apply a driveline at the high speed end of the gearbox in wind turbines with a continuously variable transmission (CVT), which can provide the constant rotation speed output for the generator under variable rotor speed of the wind power without the frequency converter. However, shafts in the CVT are subject to the pulsating torque from subsynchronous resonance (SSR), which can affect the speed control seriously. This note proposes the speed control for the permanent magnet synchronous motor as the speed regulator in the CVT at wind turbines under SSR. A linear quadratic controller with load torque observer is developed for the speed control. The simulation results verify the developed speed controller for the CVT in a 1.5 MW variable-speed wind turbine based on the simulation of SSR on Simulink and different wind speed conditions on the FAST software developed by the National Renewable Energy Laboratory.
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