Aggregation of Low-Frequency Conducted Emissions in DC Grids with Wireless Power Transfer Chargers

This work considers the aggregation of conducted emissions in the supraharmonic range below 150 kHz originating from a set of wireless power transfer (WPT) converters for electric vehicle (EV) charging. Such converters are all fed by a common DC grid, representing a promising architecture to allow the increase of EV penetration while better controlling distortion and stability. A network of three WPT converters is analysed under varying alignment, load, and synchronization conditions. The analysis demonstrates that the aggregation of emissions from multiple converters can be effectively managed through careful design of the DC grid, minimizing interference and maintaining overall system stability. Additionally, the results emphasize the significance of accounting for both the coupling coefficient and load conditions to reduce distortion and enhance the performance of the system.