Numerical Simulation Research on Microscopic Characteristics of Capacitor Short-Circuit Discharge Based on Charge Equivalent Method
Wang Dangshu1, Luan Zhezhe1, Gu Dongming1, Liu Shulin1, Wang Xinxia2
1. School of Electrical and Control Engineering Xi'an University of Science and Technology Xi'an 710075 China; 2. School of Science Xi'an University of Science and Technology Xi'an 710075 China
Abstract：In order to study the microscopic characteristics of the capacitive circuit short-circuit discharge based on the IEC spark test device, this paper established a two-dimensional parallel plate simulation model with tungsten as the anode material and cadmium as the cathode material. The simulation area was filled with air and the concentration was 8.5%. According to the principle of charge equivalence, the model adopts the particle method (PIC/MCC) to carry out numerical simulation research. The effect of the voltage between the electrodes, the distance between the electrodes and the external capacitor on the short-circuit discharge process of the capacitor is analyzed. Changes in voltage, current, various particle concentrations, and average electron energy during the discharge process after breakdown. The simulation results show that with the increase of the voltage between electrodes, the average electron energy also gradually increases. The influence of the voltage between electrodes on the ionization of N2 is much greater than that on O2 and CH4; when the electrode spacing becomes larger, the breakdown needs the longer the time, the more difficult it is for the gas medium between the electrodes to break down; the change in the capacitance of the external capacitor will basically have no effect on gas ionization, but the change in the external capacitor affects the change of the inter-electrode current, and the inter-electrode current increases after breakdown with the capacitance increasing; as the inter-electrode field strength increases, the more intense the gas ionization, the greater the current density, and the average electron energy will gradually increase.
王党树, 栾哲哲, 古东明, 刘树林, 王新霞. 基于电荷等效法的电容短路放电微观特性数值模拟研究[J]. 电工技术学报, 2021, 36(13): 2684-2696.
Wang Dangshu, Luan Zhezhe, Gu Dongming, Liu Shulin, Wang Xinxia. Numerical Simulation Research on Microscopic Characteristics of Capacitor Short-Circuit Discharge Based on Charge Equivalent Method. Transactions of China Electrotechnical Society, 2021, 36(13): 2684-2696.
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2021, Vol. 36 
