US 12,463,551 B2
Hysteretic control using arm current and error voltage in a modular multilevel converter
Rodrigo Alonso Alvarez Valenzuela, Nuremberg (DE); Kilian Dallmer-Zerbe, Bubenreuth (DE); and Diego Alberto Roman Marcos, Erlangen (DE)
Assigned to Siemens Energy Global GmbH & Co. KG, Munich (DE)
Filed by Siemens Energy Global GmbH & Co. KG, Munich (DE)
Filed on Jan. 31, 2023, as Appl. No. 18/161,998.
Claims priority of application No. 22154134 (EP), filed on Jan. 31, 2022.
Prior Publication US 2023/0246567 A1, Aug. 3, 2023
Int. Cl. H02M 7/483 (2007.01); H02M 1/00 (2006.01)
CPC H02M 7/4835 (2021.05) [H02M 1/0054 (2021.05); H02M 7/4833 (2021.05)] 8 Claims
OG exemplary drawing
 
1. A method for operating a power converter having at least one series circuit of switching modules, each of the switching modules having semiconductor switches and an energy store, which comprises the steps of:
controlling a switching frequency of the switching modules by means of hysteresis-based control; and
forming a switching integral value for the hysteresis-based control taking into account an absolute amount of an arm current flowing through the at least one series circuit, wherein the step of forming of the switching integral value includes summing at successive time points a voltage deviation as a difference between a voltage setpoint and an ascertained actual voltage value and multiplying the voltage deviation by an arm-current dependent gain factor.