{AC Versus DC Distribution Systems: Did We Get it Right?}

Title{AC Versus DC Distribution Systems: Did We Get it Right?}
Publication TypeMiscellaneous
Year of Publication2007
AuthorsHammerstrom DJ
ISBN Number1932-5517 VO -
KeywordsAC distribution systems, conversion efficiency costs, costing, Costs, DC distribution systems, DC generators, DC power systems, Design engineering, electrical power distribution systems, Energy conversion, energy management, Energy storage, Fuel cells, low-voltage distribution systems, power distribution, Power distribution economics, Power engineering and energy, Power supplies, Power system economics, Power system protection, predictive model, Predictive models, premise residential distribution systems, Systems engineering and theory, Topology
AbstractWe presently enjoy a predominantly AC electrical distribution system, the engineering basis for which was designed over 100 years ago. While AC distribution systems have served us well, we should periodically pause to assess what opportunities we have accepted or been denied by the overwhelming predominance of AC electrical power distribution systems. What opportunities could be obtained by engineering DC distribution into at least portions of our present system? What advantages of the present AC distribution system should be recognized and protected? This paper will focus on distribution within premise and low-voltage distribution systems. Specifically, we will address the conversion efficiency costs of adopting various premise AC and DC distribution system topologies. According to a simple predictive model formulated in this paper, premise residential DC distribution will incur unfavorable total conversion efficiency compared with existing AC premise distribution. However, if a residence is supplied by a fuel cell or another DC generator, the total conversion efficiency within a residential DC distribution system could be similar to, or even better than, that for AC distribution.