Research On The Control Technology Of Modular Inertial Energy Storage Pulsed Power Supply

The inertial energy storage pulsed power supply with compensated pulsed alternator(Compulsator for short,or CPA)as the core component has high energy density and power density,and it is one of the ideal pulsed power sources for the mobile electromagnetic launch(EML)platform application.With the improvement of the power level of the pulsed power supply in EML system,if a single inertial energy storage pulsed power supply is used as EML pulsed power supply,this will lead to the huge volume of CPA,the difficulty of manufacturing,the low reliability of the system,the poor control flexibility,and the harsh requirements for the parameters of the pulsed devices.The modular inertial energy storage pulsed power supply(MIESPPS)is composed of multiple inertial energy storage pulsed power unit and each unit is considered as a module.The modules work together to meet the requirements of the load on the pulsed voltage and current,and can effectiv ely solve the above problems.The configuration and control of MIESPPS is more flexible,and its control method directly determines the overall performance of the system.Therefore,this thesis studies MIESPPS's self excitation topology,excitation control method,discharge strategy,hardware architecture,and implementation of the control system.MIESPPS is based on the physical parameters and power topology of the module.The air-core CPA uses self-excitation method to establish the target excitation magnetic field.The self-excitation topology directly affects the self-excitation time,self-excitation efficiency and successful self-excitation condition.At the same time,the different requirements of different self-excitation topology on the number of controllable devices will also lead to different complexity of corresponding control system.Therefore,the high performance self-excitation topology of MIESPPS is studied in this thesis.In order to quantitatively describe and analyze the performance of different self-excitation topologies,the mathematical model of the two-phase direct axis CPA is set up.The phase separation method of the armature windings is given,and the influence of the armature winding arrangement on the physical parameters is analyzed.Based on the study of self-excitation topologies of MIESPPS unit and dual-alternator module,a high performance self-excitation topology of MIESPPS is proposed,which can reduce the number of pulsed thyristor components and its trigger units,enhance the reliability of the control system,shorten the self-excitation time of CPA,raise the self-excitation efficiency of the CPA and lower the succesfull self-excitation condition.The magnetic field excitation control of MIESPPS includes self-excitation control and excitation energy reclamation control.Self-excitation control is designed to establish the target excitation magnetic field required for the discharge of the pulsed power supply.The aim of excitation energy reclamation control is to reclaim the field excitation energy in the form of rotor kinetic energy after the discharge process.Therefore,the excitation control method of the MIESPPS is studied in this thesis.The successful self-excitation of MIESPPS is the premise and guarantee for the system to realize the expected discharge function.This thesis uses the rotor position information as the control method to apply the trigger signal of the power device,and compares it with the control method using the voltage and speed information as the trigger signal.A kind of magnetic field excitation energy reclamation control method of MIESPPS is proposed.After the discharge process,the electromagnetic field energy stored in the excitation winding can be converted to the kinetic energy of the rotor,which reduces the heat generation of the CPA excitation winding,and improves the energy utilization efficiency and continuous launching capability of the system.MIESPPS can flexibly configure the phase and output voltage of different modules,therefore,MIESPPS can provide more possibility for the overall optimization design of the EML system.With this background in mind,this thesis studies the discharge strategy of MIESPPS.The mathematical model and simulation model of the electromagnetic railgun system with different discharge strategies are established.The discharge topology,trigger mode,initial phase angle and discharge time sequence of the pulsed power supply in the MIESPPS discharge strategy are studied.The MIESPPS distributed discharge strategy for the electromagnetic railgun launch system is proposed.Compared with the strategy of concentric discharge strategy,the distributed discharge strategy makes full use of the flexible configuration of MIESPPS,reduces the torque impact of CPA during the discharge process and improves the launch performance and efficiency of the system under the condition that the kinetic energy of the projectile launched by the EML system is nearly the same.There are a lot of pulsed components in the MIESPPS power circuit,the structure and function of the control system are also complex.The synchronization requirement of the trigger signals of the pulsed devices is very strict.Therefore,this thesis carries out an experimental study on the control system of MIESPPS.In order to make the device work safely and simplify the connection topology,the devices with specific functions is assembled into pulsed power assemblies,and the topology form of the self-excitation is selected by changing the connection mode of the assemblies.The hardware architecture of the MIESPPS control system based on the rotor position information is proposed.The architecture simplifies the structure of the control system and improves the synchronism of the trigger signal.At the same time,the time delay between the trigger signals can be adjusted at the nanosecond level.The harmonic analysis method of assembly currents based on the odd extension is also proposed,and the harmonic analysis results of the assembly currents can be used as the basis for the design of the CPA electromagnetic shielding design and the conditioning circuit of diagnosis system.