Enhancement of Low-Voltage Ride Through Capability of an Offshore Wind Turbine

This paper proposes an effective control strategy to enhance the Low Voltage Ride-Through (LVRT) capability of an offshore wind turbine connected to the grid. A new nonlinear control method based on differential flatness property of systems is applied to control the wind turbines in where, the system control is carried out by planning the appropriate trajectories on components of the output variables vector of the system. Also, the reactive power of variable speed wind turbine is managed in this work in order to respect the grid code requirements during voltage dips as well as to reduce their impacts on the grid. Simulation of the system model is carried out in Matlab/SimPowerSystems. The simulation results are presented to demonstrate the effectiveness and robustness of the Flatness-Based Control (FBC) to enhance LVRT of the offshore wind turbine.