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Sensorless Control of DFIGs Based on Active and Reactive Power Computation for Encoder Fault Tolerance

par Mollet, Yves ;Gyselinck, Johan
Référence 7th International Conference on Power Electronics, Machines & Drives (PEMD2014), Manchester, UK, 8-10 April 2014
Publication Publié, 2014

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Résumé :

In this paper a new detection and isolation technique for encoder faults is presented for doubly-fed inductiongenerators. This method compares the measured rotor position with an estimation from a new MRAS observer based onthe computation of both active and reactive power transferred via the air gap. The difference between measured and estimatedposition is monitored by a CUSUM algorithm, while a second observer, based on an internal state-space model,detects anomalous changes in the measured position. A position fault is flagged when both algorithms react. The combinationof sensorless algorithm and fault detection technique is tested experimentally on a 3 kW 4-pole DFIG for differentworking points. The starting performance of the MRAS observer and its behaviour in case of transients is tested during thesynchronization process of the DFIG.