Design and Implementation of currents-sensors faults diagnosis by equivalent output error injection of Sliding-Mode for PMSG-based WECS

The performances of wind energy conversion systems (WECS) depend strongly on the current measurement accuracy. Therefore, the current sensor errors can lead to high degradation in performances and stability of the system. In order to avoid the aforementioned demerits, a method of detecting, identifying and isolation of sensors errors has been proposed in this paper. The proposed method is mainly based on identification and isolation of currents sensors faults of a permanent magnet synchronous generator (PMSG) based wind turbine, using the equivalent output error injection of sliding mode observer (SMO). In this work a linear matrix inequality (LMI) is used to minimize the uncertainty effect on the faults identification. In addition, the SMO exploits only the input/output measurements which are available in the system without additional hardware complexity. The proposed method is able to identify and isolate the current sensor faults accurately under wind conditions. Finally, the proposed method was successfully tested in real-time using a lab bench with dSPACE 1104. The obtained experimental results show clearly the accuracy and the effectiveness of the proposed method.