Inspec keywords: HVDC power transmission; power system stability; feedback; PI control; voltage control; electric current control; load flow; DC-DC power convertors; power grids

Other keywords: VSC converters; converter overload; direct current transmission grids; transient responses; voltage droop power reference adjustment; DC-DC converters; local current control; control function; DC grids; local DC voltage control; PSCAD-EMTDC model; dispatcher droop feedback; CIGRE B4 DC grid test system; 3-level cascaded control topology; grid stability; optimal power flow; control functions; central dispatcher; 3-level cascaded voltage source converter controller; droop control method; steady-state variables; fast proportional integral feedback control

Subjects: Current control; DC-DC power convertors; d.c. transmission; Power system control; Control of electric power systems; Voltage control