Crowbar Protection of Micro-Grid with DFIG Wind Turbine

Shilpa Mishra; J. N Iyer

Abstract: Low Voltage Ride Through is an important aspect for wind turbine systems to fulfill grid code requirements. In case of wind turbine technologies using doubly fed induction generators (DFIG), the reaction to grid voltage disturbances is sensitive. Since the stator of a DFIG is directly connected to a grid, this sort of machine is very sensitive to grid disturbances. Grid faults cause voltage sag and over-currents and over-voltages in rotor windings, which can damage the rotor-side converter (RSC). In order to protect the RSC, a classical solution is suggested in this paper is the installation of the crowbar protection Simulations have been carried out in MATLAB SIMULINK and the results demonstrate the effectiveness of the proposed strategy.

Keywords: DFIG, Low Voltage Ride Through (LVRT), Crowbar