Patent ID: 7778052

Claim:
A method for the operation of a converter circuit, wherein the converter circuit has a converter unit having a multiplicity of actuatable power semiconductor switches and an LCL filter which is connected to each phase connection of the converter unit, in which the actuatable power semiconductor switches are actuated by means of an actuation signal (S) formed from a hysteresis active power value (d P ), from a hysteresis reactive power value (d Q ) and from a selected flux sector (θ n ), wherein the hysteresis active power value (d P ) is formed from a differential active power value (P diff ) by means of a first hysteresis controller, wherein the differential active power value (P diff ) is formed from the subtraction of an estimated active power value (P) and a damping active power value (P d ) from a reference active power value (P ref ), wherein the damping active power value (P d ) is formed from a multiplication, divided by an adjustable damping factor (k d ), of a low-pass-filtered d-component of the Park-Clarke transformation of filter capacitance voltages (u TCf,d ) by a d-component of the Park-Clarke transformation of filter capacitance voltages (u GCf,d ) which has been filtered in respect of the fundamental of the filter output currents (i fg1 , i fg2 , i fg3 ), wherein the hysteresis reactive power value (d Q ) is formed from a differential reactive power value (Q diff ) by means of a second hysteresis controller, wherein the differential reactive power value (Q diff ) is formed from the subtraction of an estimated reactive power value (Q) and a damping reactive power value (Q d ) from a reference reactive power value (Q ref ), wherein the damping reactive power value (Q d ) is formed from a negative multiplication, divided by the adjustable damping factor (k d ), of a low-pass-filtered d-component of the Park-Clarke transformation of filter capacitance voltages (u TCf,d ) by a q-component of the Park-Clarke transformation of filter capacitance voltages (u GCf,q ) which has been filtered in respect of the fundamental of the filter output currents (i fg1 , i fg2 , i fg3 ).