LVRT capability evaluation of variable-flux PMSG based WECS

Exponential increase in installed capacity of Wind energy conversion system (WECS) in recent years has led to increased penetration into power grid. Thus, Grid-codes have started demanding better low-voltage-ride-through (LVRT) capability of coming wind generators and behave pretty much like conventional synchronous generator. This paper tests and analyses LVRT capability of a variable-flux PMSG and compares it with conventional blade-pitch-angle (BPA) control technique. Experimental setup to test LVRT capability consists of a Kaman-type dual-stator axial-flux permanent-magnet synchronous generator (DSAF PMSG) with provision of angular displacement of one of the stator with respect to other to implement mechanical flux-variation technique as proposed.