|Investigation of the impacts as direct lightning strikes on the electrical vehicles by using FDTD code
|Chen, Mingli (BEEE)
Hong Kong Polytechnic University -- Dissertations
|Department of Building Environment and Energy Engineering
|65 pages : color illustrations
|In recent years, the increasing popularity of electric vehicles (EV) can be attributed to the ongoing advancements in automotive control technology, which have led to the incorporation of a multitude of electronic components. Unlike traditional vehicles, EVs rely on both electric control circuits and drive circuits to operate. As a result, EV may be more likely to malfunction due to lightning strikes. This is a computer-based project using the Finite Difference Time Domain (FDTD) code to model the electromagnetic environment in EV systems struck by direct 200kA lightning current. The FDTD code provides a direct solution for Maxwell's equations, without resorting to any physical approximations. It has been used in studies of various problems in a very wide electromagnetic frequency band. Clarifying the transient magnetic field in EV is of utmost importance in ensuring the stability, safety, and effective lightning protection methods for EV. Although the transient magnetic field of EV body caused by direct lightning strike has been studied, the transient magnetic field caused by lightning strike in EV internal power supply system may still lead to the failure of control equipment and affect the life safety of personnel on board. This study aims to establish a suitable EV system model and simulate the impact of direct lightning strikes on the transient magnetic field of the internal power system of the EV using XFDTD software. Three different positions on the top of the EV will be compared for direct lightning strikes under sufficient boundary conditions. Subsequently, the obtained results were analyzed, which showed that it is necessary to comprehensively evaluate and test the lightning protection performance of EV while considering the coupling between the electromagnetic field induced by lightning and the vehicle's internal system. The output terminals between the motor and converter are prone to generate significant electromagnetic fields. It is suggested to ground the metal components appropriately and design robust shielding for the motor and control system to mitigate the impact of external electromagnetic fields. Future research can focus on optimizing the EV model to obtain more accurate results.
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