DC distribution for industrial systems: opportunities and challenges

TLDR

DC distribution in industrial systems faces challenges such as converter interactions and grounding problems caused by neutral voltage shifts. This paper investigates the opportunities and challenges associated with adopting a DC distribution scheme for industrial power systems. The authors simulated a prototype DC distribution system and developed a grounding scheme to address converter interaction and grounding challenges. The study demonstrates that proper filtering and control reduce converter interactions, the proposed grounding scheme keeps neutral voltages low and limits fault currents, and overall DC distribution delivers reliable, high‑quality power.

Abstract

This paper investigates the opportunities and challenges associated with adopting a DC distribution scheme for industrial power systems. A prototype DC distribution system has been simulated to investigate the issues. One of the issues focused is the interaction between power converters that are used to convert AC to DC and DC to AC. Another challenging issue investigated is the system grounding. These issues become challenging mainly due to the neutral voltage shift associated with the power converters. The paper shows that converter interactions can be minimized with proper filtering and control on the converters. The paper also proposes a grounding scheme and shows that this scheme provides an effective solution by keeping the neutral voltages low under normal conditions and by limiting the fault currents during fault conditions. With these features, DC distribution provides very reliable and high-quality power.