A Voltage Ride-through Control Based on Coordination Between Energy Storage and Wind Turbine

In allusion to the voltage ride through of wind power generating units, a voltage fault ride-through control method based on the coordinated control of energy storage and rotor of wind turbines was proposed. By use of rotor inertia response of the wind turbine generating unit cooperated with power response of energy storage the active power output of wind power generating units during the fault was regulated and then the compensation power and the capacity required by the energy storage device was reduced, meanwhile it was ensured that the grid-connected voltage of the wind turbine generating unit was maintained at the normal level, thus the voltage fault ride-through ability of wind turbine generating units was improved. Finally, by using of MATLAB/Simulink platform the model of doubly-fed induction generator (abbr. DFIG) and permanent magnet synchronous generator (abbr. PMSG) were constructed, and the simulation validation on symmetrical voltage sag, asymmetrical voltage sag and voltage rise was performed. Simulation results show that the proposed fault ride-through control method is effective.