Transition to DC distribution grids

Abstract

"The war between AC and DC has emerged once again due to the rapid development and advancement of electric power technologies. Nowadays, power electronics and DC/DC converters are able to change voltage levels, which could only be achieved by an AC transformer hundred years ago. Rising trend development of electric vehicle and renewable energy technology have led to an urgency for re-evaluation of which scheme between AC and DC that will provide best solution in terms of economic and technical aspects. The flexibility that has been offered by AC grid makes AC grid become more favourable since late 19th century. However, the urge in using renewable energies due to environmental issues and concerns has also initiated second state of war between AC and DC. Hence, the re-evaluation of the usage of AC grid distribution in consideration of DC grid distribution. This project investigates the recent development of DC grid technology, compares AC and DC grids in low voltage distribution system, and evaluates the possibility of transition between HVAC grids into low voltage DC grid."