On-line inter-turn short-circuit detection in permanent magnet synchronous generators

This paper focus on inter-turn short-circuit detection in Permanent Magnet Synchronous Generators (PMSG). Inter-turn short-circuit current are among the most critical in the PMSG. For safety considerations, a fast detection is required when a fault occurs. In this work, a fault indicator for on-line diagnosis is proposed. Based on a faulty PMSG model expressed in Park´s reference frame, the number of short-circuited turns is estimated using Extended Kalman Filter (EKF). Simulation and experimental results are provided to demonstrate the quickness and the robustness of the fault indicator with regards to various operating points on an electrical network.