| Pulsed power technology is an electrophysical science and technology that stores energy slowly and densely,compresses and regulates energy in a very short time,and realizes high pulse current.As an important research direction of pulsed power technology,superconducting pulsed power technology achieves high-density energy storage using superconducting magnetic energy storage(SMES)technology.SMES has the advantages of high energy density,long energy storage time,low loss,low power requirements for input stage,etc.,which is of great practical significance for realizing the future development of miniaturization,lightweight,integration and practicality of pulsed power technology.In this thesis,taking the electromagnetic launch technology as application object,the pulse forming mode of pulse transformer type hightemperature superconducting pulsed power supply(HTSPPS)and the coupling characteristics and discharge mode of multi-module coupled superconducting pulsed power supply(SPPS)system were studied,the feasibility of coil-type electromagnetic launcher(EML)driven by SPPS was verified by experiments,and the synchronous discharge and asynchronous discharge of multi-module coupled SPPS were respectively applied to drive coil-type and rail-type EML.The main work of this thesis can be summarized as follows:(1)The high-temperature superconducting pulsed power transformer(HTSPPT)based on Bi2223/Ag superconducting tape was optimized.The simulation results show that the superconducting coils and the normal conducting coils of HTSPPT should be arranged alternately to obtain the best performance.Based on the pulse transformer type SPPS with capacitor conversion,a hybrid energy storage SPPS based on HTSPPT was proposed.The simulation and experimental results show that the output current waveform of the SPPS can be regulated by pre-charging an initial voltage to the intermediate conversion capacitor,so that the peak value of the output current is higher and the front edge is steeper.(2)Based on the pulse transformer type SPPS circuit with capacitor conversion,the seven discharge modes of double-module SPPS and the effects of the mutual inductance between two modules on system performance and discharge modes were studied.The simulation and experimental results have confirmed the feasibility of three discharge modes: synchronous discharge,delayed discharge and asynchronous discharge.The synchronous discharge mode can maximize the amplitude of the output current,and the delayed discharge mode and the asynchronous discharge mode can simultaneously increase the amplitude and pulse width of the output current.The mutual inductance between the modules can greatly increase the energy storage of the system,thereby increasing the amplitude and pulse width of the output current and the energy obtained by the load.(3)Based on the research results of double-module SPPS,an eight-module coupled SPPS was established.The theoretical analysis and simulation results have confirmed the feasibility of the series discharge mode of multi-module coupled SPPS,which can greatly reduce the number of switches required by the system.For the parallel discharge mode,the asynchronous discharge mode of multi-module coupled SPPS was studied and applied to drive the dynamic simulation model of rail-type EML.By adjusting the trigger delay time of each module's switches,flat topped wave large currents with different amplitudes and pulse widths can be obtained,thereby achieving the uniform acceleration of armature.(4)A prototype of single-stage synchronous induction coil-type EML was designed and manufactured.The feasibility of the coil-type EML driven by a single-module SPPS was verified by experiments.Based on the traditional sleeve armature,a new type of armature with inner conical structure was proposed,and the simulation studies and experimental verifications were carried out.The inner conical armature can not only effectively improve the mechanical strength of the armature tail end,but also increase the muzzle speed of armature and the launch efficiency of system.(5)The coil-type EML driven by the synchronous discharge of multi-module coupled SPPS was investigated,the key parameters of the system were analyzed,and the effect of hybrid energy storage SPPS on the performance of the electromagnetic launch system was studied.With an initial energy storage of 18.426 k J,the armature weighing 1kg can be accelerated to 81.15m/s,giving a launch efficiency of 17.87%.Furthermore,the muzzle speed of armature and the launch efficiency of system can be further improved by parameter optimization.The parameter analysis shows that there is an ideal value interval for both the turn number of drive coil and the secondary inductance,and the smaller the secondary resistance,the better.Within a certain range,reducing the capacitance value is conducive to improving the muzzle speed and the launch efficiency.The application of hybrid energy storage circuit can also improve the muzzle speed and the launch efficiency by providing an initial voltage to the conversion capacitor. |
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