The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 2012
Filed:
Jul. 19, 2011
Beat Ronner, Birr, CH;
Tobias Thurnherr, Ennetbaden, CH;
Beat Ronner, Birr, CH;
Tobias Thurnherr, Ennetbaden, CH;
ABB Schweiz AG, Baden, CH;
Abstract
A method and apparatus are provided for operation of a converter circuit, which includes a converter unit having a multiplicity of controllable power semiconductor switches, and which is connected via a transformer to a three-phase electrical AC voltage power supply system. The method includes controlling the controllable power semiconductor switches by means of a control signal which is formed from a regulating signal. In order to damp oscillations of a power supply system voltage above the fundamental frequency, a filtered power supply system current is formed by filtering a power supply system current using a low-pass filter characteristic. A filtered transformer inductance voltage is formed by filtering a transformer inductance voltage, which is formed from the power supply system current, using a low-pass filter characteristic. A filtered power supply system voltage is formed by filtering a power supply system voltage using a low-pass filter characteristic. The regulating signal is formed by addition of a regulator voltage, the filtered transformer inductance voltage, and the filtered power supply system voltage, where the regulator voltage is formed by regulating the filtered power supply system current at a power supply system current nominal value.