Magnetic Field And Temperature Field Analysis Of Double-fed Induction Generator

As countries increasing emphasis on renewable energy development and application,Wind power capacity has gradually increased of the proportion in the national grid. Generator is a core components to convert wind energy to electricity in the double-fed wind turbines, once the generator failure, not only can make generator itself damaged, also the operation of the entire grid will have a serious impact. It is necessary to study and analyze the fault generator.Based on ANSYS software for the foundation, established a doubly-fed wind turbine 2D model. First, Study the wind generator doubly-fed the electromagnetic field distribution In the Rated state and Asymmetric fault state, Comparison and analysis the change of air-gap flux density, harmonic content,motor iron consumption and stator surface loss of these two cases. Secondly, Studied the doubly-fed wind-driven generator temperature field distribution At rated operating conditions and Completely turn-to-turn short-circuit, Overheating situation occurs at full turn-to-turn short-circuit.This is not exactly that the DFIG fault by using the national standard judgment.because, Motor surface temperature below the state regulations. Finally, Improvement of generator temperature field by increasing thermal conductivity coefficient of the motor core and insulating materials. This method can effectively reduce the turn-to-turn short-circuit fault of the DFIG.Through the above analysis, ANSYS software can calculate the electromagnetic field and temperature field distribution at each position of DFIG. We can use the data to analysis DFIG loss changes, Comparison and analysis of the generator temperature field of different materials by ANSYS software, reasonable improve generator materials, reduce the chance of generators fault.