Development Of Repetitive Frequency High Voltage Nanosecond Pulse Source Based On MPC Technology

The very fast transient overvoltage(VFTO)generated during the operation of isolating switches and circuit breakers in GIS has the characteristics of steep waveform,high amplitude and wide frequency range,which cause great harm to insulating materials and equipment.Therefore,it is of great significance to develop a voltage generator to simulate the pulse voltage with extremely steep rising edge for experimental research.Magnetic pulse compression technology is widely used in pulsed power systems.In this paper,a high-voltage repetitive frequency nanosecond pulse power supply is developed based on magnetic pulse compression technology to simulate steep pulse voltage stress.The core components of the magnetic pulse compression technology are the saturable pulse transformer and the magnetic switch.The design of these two pulse magnetic components is the core work of the development process.This article first describes the working process of the pulse power supply,analyzes the pulse voltage formation process and the charging and discharging process of the saturable pulse transformer,and performs important devices such as rectifier modules,fast recovery diodes,IGBTs,and high-voltage freewheeling components in the loop.After choosing,design the IGBT trigger board.Then,according to the performance requirements of saturable pulse transformers and magnetic switches and the selection principle of magnetic core materials,tested the inherent performance parameters of several commonly used magnetic core materials and the hysteresis characteristics under DC and AC voltages,and use Comsol Multiphysics software to study the temperature rise characteristics during re-frequency operation.After comprehensive performance comparison,select iron-based nanocrystalline 1K107 and Mn-Zn ferrite materials as saturable pulse transformer and magnetic switch core materials,design their geometric structures,and test their hysteresis characteristics under pulse voltage,then studied the pulse magnetization characteristics of iron-based nanocrystalline 1K107 and Mn-Zn ferrite cores in the range of 25℃-150℃.The results show that the saturation magnetic flux density of the 1K107 core decreases by about 4%and the magnetic flux density of the Mn-Zn ferrite core decreases by about 11%for every 25℃ increase in the core temperature,which basically meets the design requirements.According to the magnetization characteristics of the tested magnetic core under pulse conditions,the Pspice simulation software is used to build the main circuit simulation model of the pulse power supply,and the theoretical waveform parameters of the pulse power supply are obtained.Compared with the measured waveform parameters,and the influence factors of the waveform parameters From the point of view,the reason for the error between the measured waveform and the theoretical waveform is analyzed.Test the output of the developed pulse power supply.The output pulse voltage amplitude is adjustable within-27 kV,the frequency is adjustable within 10 kHz,the rising edge is 95 ns,the half-width is 130ns,and the pulse width is 240 ns.After adjustment,the same waveform can be output.The positive pulse voltage of the parameter.