公开(公告)号：WO2018189036A1

公开(公告)日：2018-10-18

申请号：PCT/EP2018/058789

申请日：2018-04-05

Applicant: ABB SCHWEIZ AG

Inventor： BESSELMANN, Thomas ,  PIEDER, Jörg

IPC: H02M5/45

Abstract: A thyristor bridge (28, 34) of an electrical converter (12) is connected to at least one DC link (30) and comprising at least one phase leg (40) for each output phase (R, S, T) and each phase leg (40) being composed of two series-connected thyristor arms (38). The thyristor arms (38) of a thyristor bridge (28, 34) are cyclically switched by: determining an upper bound (76) for a firing angle (66) of a thyristor arm (38), wherein the upper bound (76) is determined from voltage and current measurements (74, 62); and determining a firing angle (44) for the thyristor bridge (28, 34), which firing angle (44) determines a switching time (70) of the thyristor arm (38), wherein the firing angle (44) is determined, such that it is less or equal to the upper bound (76).

公开(公告)号：EP3610568A1

公开(公告)日：2020-02-19

申请号：EP18714298.9

申请日：2018-04-05

Applicant: ABB Schweiz AG

Inventor： BESSELMANN, Thomas ,  PIEDER, Jörg

IPC: H02M5/45