Patent ID: 7450405
Filing Date: 2008-11-11
Classification: H02M

Abstract:
1. A method for operating a converter circuit, with the converter circuit having a converter unit with a plurality of drivable power semiconductor switches and an LCL filter connected to each phase connection of the converter unit, in which the drivable power semiconductor switches are driven by means of a drive signal which is formed from a hysteresis power value, from a hysteresis wattless-component value and from a selected flux sector, wherein the hysteresis power value is formed from a difference power value by means of a first hysteresis regulator, wherein the difference power value is formed from the subtraction of an estimated power value and of a damping power value from a reference power value, with the damping power value being formed from a sum, weighted by a variable damping factor, of a multiplication of an α component of the space vector transformation of filter capacitance currents (i wherein the hysteresis wattless component value is formed from a difference wattless component value by means of a second hysteresis regulator, wherein the difference wattless component value is formed from the subtraction of an estimated wattless component value and of a damping wattless component value from a reference wattless component value with the damping wattless component value being formed from a difference, weighted by the variable damping factor of a multiplication of the β component of the space vector transformation of filter capacitance currents (i