Research On Discharge Characteristics Of High Power Pulse Forming Networks

As the energy source of the electromagnetic railgun,the pulse forming network can store,compress and quickly release the electrical energy,and is an important part of the electromagnetic rail launch system.Therefore,the discharge characteristics of the pulse forming network determine the launch performance of the electromagnetic railgun.This paper studies the key issues of electromagnetic railgun pulse forming network in engineering applications,including establishing discharge model,system grounding method and cable short-circuit fault.A series of studies have been carried out on the characteristics,and the main research contents are:Research the composition structure and discharge principle of the pulse forming network,analyze the function of the main circuit components of the module and its equivalent circuit model,and calculate the current peak value and the conduction time of the freewheeling branch by analyzing the discharge process of the pulse power supply.The simulation model of the network is formed,and the simulations of synchronous discharge and sequential discharge are carried out respectively;the electromagnetic rail launch test device based on this paper is introduced,and the launch experiments of single module,multi-module synchronous discharge and multi-module sequential discharge are carried out respectively,and the simulation results are compared A comparative analysis was carried out to verify the accuracy of the theoretical analysis and the model.The discharge characteristics of the electromagnetic railgun load system under different grounding methods are studied.Taking the load system as the object,the influence of direct grounding and floating grounding on the electromagnetic rail launch performance is studied.According to the circuit and kinematic equations,the dynamic launch load model is designed,the factors affecting the launch efficiency of the system are calculated and analyzed,the reasons for the load potential floating are revealed,and the load grounding and floating models are designed.By changing the circuit parameters,the transmitter is analyzed.The discharge performance of the load system under two grounding methods.The discharge characteristics of transmission cable under short-circuit fault are studied,the short-circuit fault model of pulse shaping network is established,and the fault module is divided into two loops for analysis.A single-module cable short-circuit fault simulation model was established to obtain the peak value of fault current;a multi-module pulse-shaping network cable short-circuit fault model was established,and simulations were carried out in synchronous discharge and sequential discharge respectively,and the cable short-circuit and fault current peak value and the initial velocity of the armature gun muzzle were analyzed.The relationship between,and the influence of cable short circuit on the discharge characteristics of the electromagnetic railgun pulse shaping network is calculated.The research content of this paper is of great significance to the development and application of pulsed power supply.