FIELD: power conversion engineering. SUBSTANCE: multilevel converter has capacitor C1, C2, ... Cn in each of its cells. Capacitors are rated at charge voltage proportional to their respective ordinal numbers in converter. Converter also has facility VMO1, VMO2, ... VMOn for evaluating mean voltage across terminals of each capacitor C1, C2, ... Cn, facility VE1, VE2, . . . Ven for measuring any difference that may occur relative to each capacitor between evaluated mean charge voltage and mean rated value of capacitor charge, facility VEC1, VEC2, VECn for ensuring adequate difference signal, and correction control facility BT, EC1, EC2, ... Ecn that receives mentioned difference signals and invokes arrangement of at least one temporary connection between two capacitors to correct this difference. EFFECT: improved precision of voltage control. 9 cl, 5 dwg
