Mode Study And System Design Of A Pulsed Power Supply Based On Superconducting Pulsed Power Transformers

Pulsed power technology is a multidisciplinary emerging technology discipline developed on the basis of modern scientific research and defense research. The main factors affecting its practical application is the volume and output power of the pulsed power supply, so the core issue of pulsed power technology research is the high density of energy storage technology and the high-power quick-release technology. Superconducting pulsed power technology is a new technology combining with superconducting technology and pulsed power technology. The use of superconducting inductive energy storage can achieve not only the high-density energy storage and high-power quick release, but also the advantages such as a long storage time, no loss, small size, light weight and low requirement about the input power. So it has an important significance about the future development of pulsed power technology such as lightweight, small and other practical requirements. However, as the inductance device, it also has the same flaws within the traditional inductive device in discharging phase. This paper was aiming at the pulse power design in the electromagnetic propulsion application, combining with the superconducting magnetic energy storage pulsed power mode, putting forward a single resonant circuit discharge mode, manufactured a high temperature superconducting pulsed transformer which is close to the practical requirements and did some experiments about pulse shaping. On this basis, the design of the multi-module integrated pulse power system and the simulation analysis about its feasibility of drive electromagnetic propulsion have been made.Firstly, this paper made the theoretical analysis and experimental study of the use of existing superconducting inductive energy storage and discharge mode, found the relationship between the energy loss of the resistive conversion circuit and the circuit inductance in an ideal case, and the relationship between conversion time and the limitation of superconducting inductor voltage. By using the enhanced current model of pulse transformers it can effectively obtain high-current pulse amplitude, reduce the number of parallel modules, but this model has the problem of low efficiency of energy transfer. Then, the paper analyzed on the pulse power mode of traditional low-temperature superconducting magnetic energy storage pulse transformer, introduced and explored the feasibility of using the capacitance to convert the meat-grinder circuit model, put forward the discharge patterns of single resonant circuit on the basis of the above analysis. Through simulation analysis and comparisons, it can be concluded that the discharge mode of single resonant circuit can maintain a high efficiency of energy transfer and limit the voltage of circuit breakers while has the advantage of superconducting energy storage. This provides a new way about researching the small pulse power of electromagnetic propulsion. In order to verify the feasibility of a single resonant circuit discharge model, a small high-temperature superconducting pulsed transformer close to practical requirements has been developed. In liquid nitrogen soaked conditions, the electrical characteristics and pulse shaping experiments has been tested. By getting a current pulse whose current peak exceeds4kA, it can be strong evidence that the single resonant circuit discharge mode and the structural design of high-temperature superconducting pulsed transformer were feasible. Finally, by using the experimental high temperature superconducting pulsed transformer as a unit model, a multi-module integrated pulse power system design has been made. Through the use of the electromagnetic finite element analysis and comparison of a multi-module arranged in a parallel to the axis structure and in a circle structure, it can be found that the arrangement of the circle structure is more conducive to the pulse power system with multi-module high temperature superconducting pulsed transformer. Moreover, with the number of modules increases, its static simulation performance will be increased at the same time. By combine of the single resonant circuit and the Marx generator circuit structural, a design of the eight modules of the integrated pulse shaping circuit has been made. Transient simulation of current pulse shaping process showed that the pulse power system of eight modules can get a peak current more than140kA pulse which basic meet the requirements of electromagnetic propulsion experimental research. In addition, the paper established a mathematical model of multi-module pulse shaping circuit which driving the electromagnetic propulsion and simulated and analyzed its performance of driving the electromagnetic propulsion. Some of the factors that affect the energy conversion efficiency were analyzed at the same time.