The Analysis On Quench Experiments And Numerical Models Of The Superconducting Coil Of The High Temperature Superconducting Wind Turbine Generator

In the renewable energy generation field,the High Temperature Superconducting(HTS)Wind Turbine Generator,as the combination of the wind generation technology and the HTS applied technology,supported by its small volume,light weight and high efficiency,holds great development potential for high-power wind generation.However,affected by the complicated electromagnetic environment inside the generator,the local defect of HTS strip,the resistivity in the joint,the external energy disturbance and many other factors,the HTS coil of the HTS Wind Turbine Generator could be involved to the potential risk of inducing quenches,having a bad impact on the whole working performance of the generator.Therefore,the research on the analysis of the HTS coil quench behavior is of great significance to the safe and stable operation of the HTS Wind Turbine Generator.In this thesis,we have used experimental and numerical methods to conduct the quench analysis.On the aspect of experimental research,based on the autonomous designed HTS tape quench experimental platform and the HTS coil quench experimental platform,we firstly conduct the HTS tape quench experiments in the 77 K vacuum and thermal insulated environment,which is the foundation of the HTS coil quench experiment.Then the HTS racetrack coil is wound and the related coil quench experiment is conducted successfully.The results show that for both of the HTS tape and the HTS coil,the Minimum Quench Energy(MQE)increases as the operating current decreases,while the Normal Zone Propagation Velocity(NZPV)increases as the operating current increases.Moreover,the MQE of the HTS coil is bigger than that of the HTS tape,and inside the HTS coil,the longitude NZPV is higher than the transverse NZPV.On the aspect of numerical research,with the help of the Finite Element Analysis(FEA)platform,a numerical model of coupled electromagnetic-thermal field is proposed which could estimate the quench behavior of the HTS tape and coil.Parameters of the tape and coil are inputted into the model.After the calculation,the results from experiments and simulations are compared,and the causes of errors are analyzed in detail.Finally,the accuracy and reliability of the numerical model is verified.