Advances in semiconductor technology and growing adoption of localized renewables are driving greater integration of DC-output power electronic converters in DC grids, creating significant EMC challenges in the 2-150 kHz range. This paper investigates such issues using time & frequency domain analysis through a laboratory based DC grid. The setup includes a black-box DC supply connected to three identical open-box DC/DC converters via four different DC-link capacitors. Differential mode conducted EMI is measured at the point of common coupling in the DC grid. Peak voltage levels in the frequency domain (in dBμV) and average voltage levels (in V) in the time domain are analysed, as three converters are connected sequentially. The results indicate that variations in DC-link capacitance significantly influence impedance interactions between the DC supply, converters and DC-link, thereby affecting the resulting conducted EMI. The findings highlight the need for further research and standardization to regulate EMC in DC grids and connected converters.
Khilnani, A.D., Quintal, A.E.P., Simonazzi, M., Sandrolini, L., Sumner, M., W. P. Thomas, D. (2025). EMC in DC Grids: Problematic Issues in the 2-150 kHz Bandwidth. Institute of Electrical and Electronics Engineers Inc. [10.1109/emceurope61644.2025.11176319].
EMC in DC Grids: Problematic Issues in the 2-150 kHz Bandwidth
Simonazzi, Mattia;Sandrolini, Leonardo;
2025
Abstract
Advances in semiconductor technology and growing adoption of localized renewables are driving greater integration of DC-output power electronic converters in DC grids, creating significant EMC challenges in the 2-150 kHz range. This paper investigates such issues using time & frequency domain analysis through a laboratory based DC grid. The setup includes a black-box DC supply connected to three identical open-box DC/DC converters via four different DC-link capacitors. Differential mode conducted EMI is measured at the point of common coupling in the DC grid. Peak voltage levels in the frequency domain (in dBμV) and average voltage levels (in V) in the time domain are analysed, as three converters are connected sequentially. The results indicate that variations in DC-link capacitance significantly influence impedance interactions between the DC supply, converters and DC-link, thereby affecting the resulting conducted EMI. The findings highlight the need for further research and standardization to regulate EMC in DC grids and connected converters.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
