This course covers high-voltage direct current (HVDC) transmission systems and associated power electronic converter topologies, with substantial attention given to line commutated converter (LCC) and modular multilevel converter (MMC) technologies. Major topics include i) modeling, analysis, operation and control of classical HVDC systems using six-pulse and multi-pulse LCCs, ii) modeling, analysis, operation and control of voltage-sourced converter based HVDC systems, iii) modeling, analysis, operation and control of the MMC for HVDC applications, iv) overview of multiterminal HVDC schemes including HVDC grids, introduction to HVDC line power tapping and Flexible AC Transmission System (FACTS) Controllers.