并联气体开关导通分散性对平行板汇流装置放电电流的影响

Effect of Parallel Gas Switch Conduction Dispersion on the Discharge Current of Parallel Plate Collector-current Device

为研究平行板汇流脉冲功率装置中并联开关导通分散性对装置放电电流的影响,依据实验结果,建立气体开关导通分散性模型和不同参数模块的电路仿真模型,分析放电电流随开关导通分散性大小和回路参数变化的规律。研究结果表明:开关导通分散性会引起回路出现过电流,降低回路电感和回路电容,增加负载电感和并联路数将导致过电流极值的进一步增加;过电压是开关延时数微秒依旧能够导通的必要条件,仅一台开关延迟导通时存在过电流幅值的最大值,模块1在70 kV工作电压时回路的最大过电流峰值607 kA,过电流倍数1.33;模块2在35 kV工作电压时回路的最大过电流峰值590 kA,过电流倍数15.6。随着延时导通开关数量和开关导通分散性的增加,负载电流峰值降低,电流上升时间增加,而各回路之间的电荷重新分布使负载电流受影响小于回路电流。负载电流的可用性和装置的安全运行允许负载电流峰值的波动≤5%,需要模块1分散性≤587.5ns,模块2分散性≤35.25μs,对应的过电流最大值分别为504 kA和135 kA。

We investigated the impact of parallel switches’dispersion of conduction on parallel-plate pulse power devices’discharge current.Based on the experimental results,a model for the gas switch conduction dispersion and a circuit simu-lation model with various parameter modules were developed to study how the discharge current varies as the switch conduction dispersion size and different circuit parameters change.The study results show that overcurrent in the loop is caused by switch conduction dispersion.The overcurrent extremes will rise further with decreasing loop inductance and capacitance,raising load inductance,and increasing the number of parallel circuits.Overvoltage is a necessary condition for the switch to be able to turn on after a delay of several microseconds.The circuit’s maximum overcurrent peak value for module 1 is 607 kA at 70 kV operating voltage and has an overcurrent multiplier of 1.33;the maximum overcurrent peak value of circuit for module 2 is 590 kA at 35 kV operating voltage and has an overcurrent multiplier of 15.6.As the number of delayed conduction switches and switch conduction dispersion increases,the peak value of the load current decreases,and the rise time of the load current increases.Moreover,the charge redistribution between each circuit causes the load current to be affected less than the circuit current.The availability of load current and the safe operation of the device allow fluctuations in peak load current of no more than 5%,requiring a dispersion of no more than 587.5 ns for module 1 and 35.25μs for module 2,corresponding to overcurrent maximum values of 504 kA and 135 kA,respectively.