Inspec keywords: voltage control; power convertors; feedback; closed loop systems; PI control; control system synthesis; variable structure systems; electric current control; DC-DC power convertors; power grids

Other keywords: three-level neutral-point-clamped converter; variable voltage; outer voltage loop control; closed-loop control topology; control topology input-parallel–output-series converter system; inner current loop control; input-parallel–output-series control strategy; three-level medium-voltage DC grid-type converter; input current sharing; sliding mode control; ICS; proportional–integral control method; constant output voltages; grid-connected converter; constant frequency; comprehensive control feedback system; DC voltages; high-output power applications; constant magnitude; output current sharing

Subjects: Power convertors and power supplies to apparatus; Control of electric power systems; Control system analysis and synthesis methods; Voltage control; Power electronics, supply and supervisory circuits; Current control; Multivariable control systems