US 12,438,472 B2
Power conversion system and operating method
Ibrahim Alisar, Nuremberg (DE); Emilio David Rebollo López, Madrid (ES); and José Luis Rodriguez Izal, Burlada (ES)
Assigned to Siemens Gamesa Renewable Energy Innovation & Technology, S.L., Sarriguren (ES)
Appl. No. 18/703,547
Filed by Siemens Gamesa Renewable Energy Innovation & Technology, S.L., Sarriguren (ES)
PCT Filed Oct. 21, 2022, PCT No. PCT/EP2022/079369
§ 371(c)(1), (2) Date Apr. 22, 2024,
PCT Pub. No. WO2023/072751, PCT Pub. Date May 4, 2023.
Claims priority of application No. 21382968 (EP), filed on Oct. 27, 2021.
Prior Publication US 2024/0421719 A1, Dec. 19, 2024
Int. Cl. H02J 3/38 (2006.01); H02M 1/00 (2007.01); H02M 1/12 (2006.01); H02M 5/458 (2006.01)
CPC H02M 5/4585 (2013.01) [H02J 3/38 (2013.01); H02M 1/0054 (2021.05); H02M 1/12 (2013.01); H02J 2300/28 (2020.01)] 14 Claims
OG exemplary drawing
 
1. A power conversion system configured to provide electrical power conversion, comprising:
a first power converter comprising power electronic switches of a first type that are switchable to provide electric power conversion, wherein the first power converter comprises a first back-to-back converter comprising a first intermediate DC bus;
a second power converter connected in parallel to the first power converter wherein the second power converter comprises power electronic switches of a second type that are switchable to provide electric power conversion, wherein the second type is different from the first type, wherein the second type of power electronic switches comprises wide bandgap semiconductor switches, and wherein the second power converter comprises a second back-to-back converter comprising a second intermediate DC bus; and
a controller configured to operate the power conversion system in a first operating mode in which the second power converter is operated at a first switching frequency of the power electronic switches to provide power conversion, and in a second operating mode in which the second power converter is operated at a second switching frequency of the power electronic switches and the first power converter is operated to provide power conversion, wherein the second switching frequency is higher than the first switching frequency,
wherein the first back-to-back converter has a first converter unit and a second converter unit coupled by the first DC bus, and wherein the second back-to-back converter has a first converter unit and a second converter unit coupled by the second DC bus, wherein, in the second operating mode, the first converter unit of the second back-to-back converter provides active filtering for the first converter unit of the first back-to-back converter, and the second converter unit of the second back-to-back converter provides active filtering for the second converter unit of the first back-to-back converter.