Fault Diagnosis of Blade Imbalance and Winding Asymmetry of Direct-driven Wind Turbine With Permanent Magnet Synchronous Generator

It is critical to implement fault diagnosis for a wind turbine in order to improve its safety and reliability. A new method for fault diagnosis of blade imbalance and winding asymmetry of the direct-driven wind turbine with a permanent magnet synchronous generator(D-PMSG) is proposed in this paper, where no additional sensors and data acquisition equipment are needed. In this paper, the influences to stator currents of PMSG as the two faults occurred in the D-PMSG were analyzed. Park transformation was used to process the three-phase stator currents, and then fast Fourier transform was applied to analyze the square of Park' vector modulus(SPV) of the stator currents. The fault diagnosis of D-PMSG is carried out by observing the amplitude variations of the characteristic frequencies in the SPV. The simulation model and experimental verification platform of D-PMSG were built. The simulation and preliminary experimental results validate that the proposed approach applied to fault diagnosis of wind turbine is feasible.