Dämpfung von Oberschwingungen Höherer Ordnung in Durchschnittlichen Gleichstromverbindungsspannungen

Details

Veröffentlichungs-Nr.

EP4231516

Aktenzeichen

EP22158052

Anmeldetag

22. Februar 2022

Veröffentlichung

2. April 2025

Erteilung

2. April 2025

Rechtsraum

EP

IPC

H02M7/23H02P29/50

Abstract

A converter system (14) comprises at least two branches (18), wherein each branch (18) comprises an AC-to-DC converter (26) and a DC link (28) cascade connected with each other. A method for controlling a converter system (14) comprises: determining at least two AC-side currents iISiIIS, each of which is input into one of the AC-to-DC converters (26); determining from the AC-side currents iISiIIS, a voltage reference vavrefvdiffref for each of the AC-to-DC converters (26), such that the AC-side current iISiIIS follows a current reference iavrefidiffref, for the respective AC-to-DC converter (26); determining a DC link ripple indicator (V_dc,av, i_dc,av, p_av), which DC link ripple indicator (v_dc,av, p_av) is an average DC link voltage (V_dc,av) of the DC links (28), an average DC link current (i_dc,av) of the DC links (28) and/or an average active power (p_av) input into the at least two branches (18); determining a converter reference correction (44) from the DC link ripple indicator (V_dc,av, i_dc,av, p_av), such that a higher order harmonic in the average DC link voltage (V_dc,av) is damped; determining corrected voltage references vIsrefvIIsref for the AC-to-DC converter (26) by adding the converter reference correction (44) to the voltage references of the AC-to-DC converters (26) or by adding the converter reference correction (45) to an average current reference for the AC-to-DC converters (26); and controlling the AC-to-DC converters (26) with the respective corrected voltage references vIsrefvIIsref.

Anmelder

Firma

ABB SCHWEIZ AG

Land

🇨🇭 Schweiz

Fachgebiete