Patent ID: 8259473
Filing Date: 2012-09-04
Classification: H02J,H02M,Y02E

Abstract:
1. A method for operation of a converter circuit, wherein the converter includes a converter unit having a multiplicity of controllable power semiconductor switches, and the converter unit is connected via a transformer to a three-phase electrical AC voltage power supply system, wherein the method comprises: controlling the controllable power semiconductor switches by means of a control signal which is formed from a regulating signal; forming a filtered power supply system current by filtering a power supply system current using a low-pass filter characteristic, the filtering of the power supply system current being carried out in a first filtering process using a system which rotates at the fundamental frequency of a power supply system voltage; forming a filtered transformer inductance voltage by filtering the transformer inductance voltage, which is formed from the power supply system current, using a low-pass filter characteristic, the filtering of the transformer inductance voltage being carried out in a second filtering process using a system which rotates at the fundamental frequency of the power supply system voltage; forming a filtered power supply system voltage filtering the power supply system voltage using a low-pass filter characteristic, the filtering of the power supply system voltage being carried out in a third filtering process using a system which rotates at the fundamental frequency of the power supply system voltage; and forming the regulating signal by addition of a regulator voltage, the filtered transformer inductance voltage, and the filtered power supply system voltage, wherein the regulator voltage is formed by regulating the filtered power supply system current at a power supply system current nominal value.