Inspec keywords: electric current control; HVDC power convertors; power capacitors; power convertors; HVDC power transmission; switching convertors; capacitors; voltage control

Other keywords: sub-module capacitor voltage; optimised balancing control algorithm; modular multilevel converter; MMC; capacitor voltage imbalance problem; good application prospect; modulation algorithms; capacitor voltage balancing control; control technology; switching devices; AC output voltage harmonic content; voltage source converter-based HVDC; average switching frequency; balancing control thresholds; high-voltage direct current transmission; ends HVDC transmission system

Subjects: Power convertors and power supplies to apparatus; Control of electric power systems