EMTP simulation of the CIGRE B4 DC Grid test system

2011, CIGRE B4 study committee initiated several Working Groups (WG) to study the potential future introduction of dc grid.
> https://powersys-solutions.com/2015/01/emtp-rv-newsletter-january-2015-emtp-rv-simulation-of-the-cigre-b4-dc-grid-test-system/