Abstract:
One of the most important aspects for large scale integration of wind power systems is the fault ride through (FRT) capability with frequency and voltage stabilization. Large voltage sags induce high voltages in the rotor circuit of the DFIG and thus the rotor current rises and could exceed the current capability of the converter switches. Dynamic performances of a grid-side converter (GSC) to grid voltage sags and fault conditions with active damping and without active damping are presented. Under the same control platform, a faster dynamic response is achieved for the DC-link voltage when active damping is considered as against a sluggish and ripple-infested response without active damping. Under fault condition, a 42% decrease in DC-link voltage is realized when active damping is considered. This is against 136% increase in the DC-link voltage that may excite the protective system to disconnect the grid-side converter subsystem from the rest of the network and thus disenable the ride-through capability of the GSC subsystem when active damping is not considered.
