Performance of line protection and supervisory elements for doubly fed wind turbines

This paper analyzes the response of conventional protection schemes (Line current Differential and Mho Distance elements) and the supervisory elements associated with those protective elements in commercial relays for Type 3 (Doubly Fed Induction Generator based) grid integrated wind farms. The response of line protection elements and their supervisory elements are analyzed using real time by hardware-in-the-loop simulation and differences from the behavior in case of conventional power systems are pointed. Faults are analyzed from the relay´s perspective and the observed behavior is elaborated upon. Challenges associated in using sequence components and relay sensitivity are discussed.