Analysis Of The Electromagnetic Field And Temperature Field Of The Motor When The Voltage Of The Grid Is Symmetrical To Different Degrees

With the adjustment of national energy strategy,wind power has developed rapidly on the basis of its own advantages.With the more and more perfect control strategy of wind turbine,the power grid with large scale wind power system is becoming stronger and stronger.Therefore,the ability of wind turbines to fight the sudden drop of the grid voltage becomes more and more important.In order to study the occurrence of low voltage across,with voltage drop and deepening impact current in different degree of drop impact on the internal components of wind turbine,this paper use the PSCAD software,establish the model of grid connected doubly fed generator.Calculate the drop in different degree in the grid voltage when the system falls into crowbar circuit and adding crowbar circuit,motor rotor and stator current of rotor current changes and trends in different situations,and the influence of the internal components of the motor.Then use the ANSYS software to establish the two-dimensional model of DFIG,and will use the PSCAD software to obtain the load current to ANSYS 2D model,and then through the finite element software for solving the electromagnetic field inside the motor,and the results are thus postprocessing,change curve of the generator internal magnetic field distribution diagram,Miyun,magnetic flux density in the air gap the curve and the reference point through the magnetic induction of the whole process in low voltage gain,variation of reference point magnetic induction intensity curve by comparing the voltage drop of different degree,when the grid voltage sags in different degrees of internal magnetic field changes the motor trend,and its impact on the internal components of the motor.Finally,the two-dimensional ANSYS temperature field model is established,and the results of the ANSYS two-dimensional electromagnetic field analysis are obtained,and the temperature field of the motor under different working conditions is obtained through the post-processing.The change trend of the internal temperature field and the influence of the change of the temperature field and the external environment temperature on the internal components of the motor are analyzed...