Simulation and performance analysis of a new LVRT and damping control scheme for DFIG wind turbines

Abstract

Doubly-Fed Induction Generator (DFIG) Wind Turbine (WT) is rather sensitive to power system faults and requires specific power converter protection, namely a crowbar. When the crowbar is triggered, the rotor is short circuited over the crowbar impedance, the rotor-side converter (RSC) is incapacitated and therefore the DFIG operates as a squirrel-cage induction generator (SCIG) that tends to drain large amount of reactive power from the grid during fault, potentially causing a voltage drop. Therefore, in order to enhance the transient stability and damping of the electro-mechanical oscillations of a grid-connected DFIG wind farm, in this paper we propose the use of DFIG based Low-voltage Ride Through (LVRT) scheme including crowbar, RSC, GSC (Grid-side converter) and PSS (Power System Stabilizers).