US 12,074,531 B2
Converter system
Mario Schweizer, Rütihof (CH); Ivan Furlan, Brissago (CH); and Nicola Notari, Gentilino (CH)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Jun. 15, 2022, as Appl. No. 17/840,790.
Claims priority of application No. 21180063 (EP), filed on Jun. 17, 2021.
Prior Publication US 2022/0407430 A1, Dec. 22, 2022
Int. Cl. H02M 1/08 (2006.01); H02M 5/458 (2006.01); H03L 7/08 (2006.01)
CPC H02M 5/458 (2013.01) [H02M 1/08 (2013.01); H03L 7/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A converter system, comprising:
a rectifier configured to receive a grid voltage;
a DC link stage configured to receive an output voltage of the rectifier and to provide a DC link voltage for an inverter;
wherein the inverter is configured to receive the DC link voltage from the DC link stage, and to generate an output voltage, and wherein the rectifier, the DC link stage and the inverter are connected in series; and
a control unit, the control unit comprising:
a slow reference frame angle determination unit configured to generate a slow reference frame angle θr,slow representing an angle that is slowly following a grid phase deviation; and
a fast Phase Locked Loop, PLL, configured to generate a fast reference frame angle θr,fast representing an angle that is fast following a grid phase deviation;
wherein the control unit is further configured to use the slow reference frame angle θr,slow and the fast reference frame angle θr,fast to control a rectifier output current, and to use the fast reference frame angle θr,fast to control the inverter output voltage and to synchronize the inverter output voltage with the grid voltage.