US 12,113,456 B2
Apparatus and method for controlling delta-connected cascaded multilevel converter
Xing Huang, Beijing (CN); Hailian Xie, Beijing (CN); Guangming Pei, Beijing (CN); Hua Wei, Beijing (CN); and Min Li, Beijing (CN)
Assigned to ABB SCHWEIZ AG, Baden (CH)
Appl. No. 17/753,860
Filed by ABB Schweiz AG, Baden (CH)
PCT Filed Feb. 28, 2020, PCT No. PCT/CN2020/077183
§ 371(c)(1), (2) Date Mar. 16, 2022,
PCT Pub. No. WO2021/168791, PCT Pub. Date Sep. 2, 2021.
Prior Publication US 2022/0407407 A1, Dec. 22, 2022
Int. Cl. H02M 7/49 (2007.01); H02J 3/01 (2006.01); H02M 1/12 (2006.01); H02M 1/15 (2006.01); H02M 1/00 (2006.01); H02M 5/458 (2006.01)
CPC H02M 7/49 (2013.01) [H02M 1/12 (2013.01); H02M 1/15 (2013.01); H02J 3/01 (2013.01); H02M 1/0025 (2021.05); H02M 5/458 (2013.01)] 24 Claims
OG exemplary drawing
 
12. A method for controlling a delta-connected cascaded multilevel converter, comprising:
receiving current signals indicating phase currents flowing through respective phase arms of the converter;
determining a harmonic current signal indicating a circulating current of the converter from the current signals;
generating, based on the determined harmonic current signal and a reference current signal, a harmonic voltage signal to cause an amplitude of the circulating current flowing through the phase arms of the converter to be a predetermined amplitude;
receiving a phase voltage reference signal associated with a load electrically coupled to the converter; and
generating, by combining the harmonic voltage signal with the phase voltage reference signal, a control signal for controlling the converter to cause a peak amplitude of the phase currents to be a first amplitude,
wherein the first amplitude is associated with a second amplitude of the circulating current in the phase currents.