Structural Design Of High Power Superconducting Wind Generator

With the energy crisis and environmental pollution intensified,wind energy as a sustainable development and pollution-free new energy sources of concern in the field of wind power has a wide range of applications.In recent years,there has been a trend toward increasing turbine rating.Traditional generator because of its low power density in the application of high-power generator is limited,superconducting technology can make the generator miniaturization,power more powerful,stable performance.This paper presents a marine high-power superconducting wind generator,the specific content summarized as follows:Superconducting wind turbines are complex devices that involve knowledge of electromagnetic fields,force analysis,torque analysis,temperature field analysis,cooling system design,and so on.Aiming at the problem of large volume,high installation and maintenance cost of traditional high power generator.2-D steady-state finite element method is used to design the electromagnetic structure of 10 MW fully superconducting wind generator.The structure parameters of the generator body are discussed,and the results of the electromotive force solution and the distribution of the magnetic field inside the generator are given.Though the same power level under the superconducting generator and permanent magnet generator weight and cost comparison program,reflecting the advantages of super small size and weight.Using the finite element method combined with parametric thinking to optimize the generator speed,shielding layer thickness and other structural parameters.The optimization process of generator parameters under 3-D transient is given,and the electromagnetic performance of the generator before and after optimization is compared to verify the feasibility and effectiveness of the parametric method.In order to evaluate the merits of generator performance,the output characteristics of in-depth analysis.Mainly obtained the voltage,current,magnetic density and torque waveform,extract the harmonic analysis of the waveform quality.Concerned about the efficiency of the generator,focusing on the stator core loss for numerical analysis.The design of the superconducting wind generator is discussed and the performance is good.Though the coupling field analysis of the rotor force to complete the rotor support structure design,to ensure stable operation of the generator.While avoiding the occurrenceof resonance,the inherent vibration characteristics of the superconducting coil are studied and the results of the model analysis are obtained.Finally,considering the complexity and cost of the superconducting wind generator,combined with the common working fluid and cooling method,the cooling system of stator cold helium convection heat transfer and rotor nitrogen intrusion is selected.