Electromagnetic Analysis And Design Of Energy Storage High Temperature Superconducting Pulse Power Transformer Coils

Miniaturization and lightening are the inevitable development trend in the practical process of pulse power supply.With the continuous advancement of the research process of high-temperature superconducting materials,the practical process of high-temperature superconducting equipment has accelerated,and pulse power supplies based on high-temperature superconducting pulse power transformer(HTSPPT)have shown great development prospects.Energy storage type HTSPPT integrates high-density energy storage and pulse compression into one,which is one of the important equipment of inductive energy storage type pulse power supply.Most of the current literatures on HTSPPT are aimed at the design of circuit topologies,while the electromagnetic analysis and optimization design of coils are relatively few.There are many reports on the coil design of high-temperature superconducting energy storage magnets(SMES)in the literature on inductive energy storage,and there are few literatures on the coils of energy storage superconducting pulse transformers.Therefore,this paper proposes several optimization schemes for the coil structure of energy-storage HTSPPT,and these schemes are simulated and calculated.First,this article introduces the difference between superconducting strips,and selects the HT-NX type Bi2223 / Ag strip from Sumitomo Corporation of Japan.Then,this article introduces the method of calculating the critical current of bismuth-based superconducting strips.Simultaneously with the function of fitting the strip characteristic curve.In order to reduce the effect of skin effect on the resistance and increase the induced current of the secondary coil,for the design of the secondary inductor coil of the energy storage type HTSPPT,this paper proposes four split schemes,using the finite element simulation software Ansys Maxwell for analysis.Then,in order to improve the critical current,energy storage capacity,energy storage density and other parameters of the HTSPPT,a single-module superconducting pulse transformer structure using D-typed and runway coils was designed,and three shapes of superconductors were established using Ansys Maxwell transformer model,calculate and analyze the effect of shape on coupling coefficient of pulse power transformer and energy storage density of superconducting coil.Based on the single-module energy storage type HTSPPT coil,a multi-module HTSPPT with a toroidal coil,D-typed coil and runway coil structure is designed.Ansys Maxwell simulation is used to analyze the different coil structure pairs.The impact of multi-module superconducting transformer performance.The above research shows that for the HTSPPT using the secondary coil segmentation,due to the influence of circulating current,the pulse current induced by the secondary inductor coil has not been improved.For a single-module superconducting pulse transformer with a certain amount of strip material,the energy storage capacity and coupling coefficient of the circular coil and the D-typed coil structure are higher.Considering the central air region of the coil,the energy storage density of the D-typed structure superconducting coil maximum.For a multi-module energy storage type high-temperature superconducting pulse transformer with a certain total amount of strip material,the runway coil structure can obtain higher energy storage capacity,while the D-typed coil structure can obtain higher energy storage density.This provides some references for the practical and development of energy storage type HTSPPT,and also has certain value for the optimized design of miniaturization and light weight of pulse power supply.