Abstract
Wide bandgap (WBG) devices able to tolerate high voltages and currents and operating at higher frequencies are the most promising approach for reducing the size and weight of power management and conversion systems. These systems are envisaged to be widely used in next generation aircraft, ships, and vehicles, which are expected to be more electric or, possibly, all electric as well as in power grids. However, accelerated aging of solid dielectrics used in various apparatuses for electrification of the applications above under fast (slew rates (dv /dt) ranging from tens to hundreds of kV/$\mu$s) and repetitive voltage pulses (frequencies ranging from hundreds of kHz to MHz) originated from WBG-based system due to partial discharges (PD) can offset or even be an obstacle for using WBG-based systems. Several factors affect the happening of PD, of which frequency and rise-time can be enumerated as the most important ones. In this paper, a cavity-dielectric model is developed to investigate the PD phenomena. In order to model the case study, and dynamically monitor the changes in the electric field and voltage distribution in both cavity and dielectric, Finite-Element Analysis (FEA) is employed. The model development and analysis is performed in COMSOL Multiphysics. The occurrence of PD and the impact of different parameters on PD ignition, such as cavity shape, cavity diameter, and frequency are evaluated.
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