1. U.S. Department of Energy, The War of the Currents: AC vs. DC Power (U.S. Department of Energy, 2014). https://www.energy.gov/articles/war-currents-ac-vs-dc-power
2. Siemens, High-Voltage Direct Current Transmission (HVDC) Fact Sheet (2012). https://www.siemens.com/press/pool/de/events/2012/energy/2012-07-wismar/factsheet-hvdc-e.pdf
3. A. Shekhar, Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters. Int. J. Electr. Power Energy Syst. 93, 479–493 (2017)
4. X. Yao, Study on DC arc faults in ring-bus DC microgrids with constant power loads, in 2016 IEEE Energy Conversion Congress and Exposition (ECCE) (2016)
5. S. Frank et al., Energy Design and Scoping Tool for DC Distribution Systems (U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, 2017). Retrieved from https://www.energy.gov/sites/prod/files/2018/01/f47/8g_BERD_NREL.pdf