Key Technology Study Of 10MW High Temperature Superconducting Wind Generator

In order to master the key technology to design and study the 10 MW high temperature superconducting(HTS)wind generator,some works have been done on the kW class HTS generator prototype in Dongfang Electric(DEC),including the structure and parameters design,and the operation performance analysis.Based on the technical reserve,the key technologies of the 10 MW HTS wind generator is studied.The main contributions and innovative points are presented as follows:1.Based on the H formulation combined with the Comsol PDE,the numerical simulation model of superconductor has been built,with which the electromagnetic characteristics have been studyed and analyzed,including the induction performances under different external magnetic fields,AC loss under AC field,AC losses at different fields and currents,and AC loss with transporting current and exposing to the external field.2.The structure design,basic parameters design and electromagnetic characteristics analysis of the prototype generator are finished.Besides,the regular operation rules are obtained and prepare the technical reserve for the design and research of HTS wind generator.3.Based on the graphic method and genetic algorithm,the design of HTS field coil is optimized by lowering the consumption of superconducting material and reducing the effect of sensitive magnetic field to boundary current,which increases the utilization ratio of superconducting material.By the use of finite element simulation software,the position of minimum boundary current of field coils is specifically confirmed.4.Through repetitive tests,an improvement plan is proposed by choosing the electrodeposited polyimide as the insulation layer of field coil.The boundary current I_c and n value are both increased in the test curve of field coil whose length is more than200 m.The whole work performance of field coil is improved.5.During the design of the 10 MW HTS wind generator,a structure of overlapped HTS field coil is proposed.Through FEM analysis,the proposed structure can improve the field distribution in the air gap and decrease the iron loss of the system,improving the overall efficiency.6.A deign of new type of refrigerating system suitable for high capacity HTS wind generator is proposed,which needs no rotating joint to eliminate the negative effect.Through simulation and comparison,it is confirmed that this design can increase the utilization ratio of refrigerant and the refrigerating efficiency.