Abstract
In order to study the theory and characteristics of the mechanical drive system fault in the current signal of the wind turbine generator better, the fault simulation experimental platform of double fed wind generator drive gear is used as the research object, and the simulation model of double motor torque and rotational speed coupling is established by a motor and a doubly fed wind generator according to the mathematical model of AC asynchronous motor. Moreover, a detailed simulation analysis is carried out to the situation that the experiment platform is difficult to realize or test. The results show that the fault characteristic information in generator stator current is mainly transmitted by the speed fluctuation, and due to the influence of the system inertia and the harmonic components of the rotor excitation converter, it is more difficult to identify and diagnose the fault characteristic information. Therefore, how to remove the harmonic component to improve the ability of fault feature recognition is a problem to be solved for doubly fed wind generator.
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