Method for operating a converter circuit, and apparatus for carrying out the method

An apparatus for carrying out a method for operating a converter circuit, wherein the converter circuit has a converter unit with a multiplicity of actuatable power semiconductor switches and is connected to a three-phase electrical AC mains system, having a control apparatus which is used to produce a control signal (SR) and which is connected to the actuatable power semiconductor switches via an actuation circuit for forming an actuation signal (SA), wherein the control apparatus has a first controller unit for forming the control signal (SR) by adjusting an H-th harmonic component of system currents (iNH) to a system current setpoint value (iNHref), wherein H=1, 2, 3, . . . ,

• wherein the control apparatus has a second controller unit for forming the system current setpoint value (iNHref) by adjusting the absolute value of an H-th harmonic component of system voltages (uNH) to the absolute value of a prescribable system voltage setpoint value (uNHref).

A converter circuit arrangement, comprising:

• a converter unit with a plurality of actuatable power semiconductor switches, the actuatable power semiconductor switches capable of being actuated based on an actuation signal formed from a control signal;
• and
• a control apparatus to produce the control signal, wherein the control signal is based on adjusting an H-th harmonic component of system currents to a system current setpoint value, wherein for the purpose of reducing a harmonic component in the system voltages, the system current setpoint value is formed by adjusting the absolute value of an H-th harmonic component of system voltages.