Feasibility Region with Proposed Control Riding-through operation range 0.2 riding-through operation fange a0.15 0.1 0.05 super-synchronous sub-synchroneus -0.1 0.1 0.2 0.3 Pre-fault silp: so (pu) This plot says that the dF iG can successfully ride through a grid fault which brings terminal voltage down to 0.3 pu, even it initially operates at full speed-0.3 -0.2 -0.1 0 0.1 0.2 0.3 0 0.05 0.1 0.15 0.2 0.25 Pre-fault silp: s0 (pu) Fault voltage level: Us (pu) Riding-through operation range riding-through operation range Feasibility Region with Proposed Control { super-synchronous sub-synchronous This plot says that the DFIG can successfully ride through a grid fault which brings terminal voltage down to 0.3 pu, even it initially operates at full speed