公开(公告)号：US20210351714A1

公开(公告)日：2021-11-11

申请号：US17278161

申请日：2019-09-19

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian BIRIS ,  Kent TANGE ,  Duy Duc DOAN ,  Gert Karmisholt ANDERSEN ,  Torsten LUND ,  Lars MEYER

IPC: H02M5/42 ,  H02P9/02 ,  H02M1/44 ,  F03D9/25

Abstract: This invention concerns a method of controlling a power converter system 26 operating in an overmodulation region. The power converter system 26 comprises more than two current controllers 71, 73, 77, 79 a modulator 76 and a power converter 78, and the modulator 76 is configured to provide at least one modulated drive signal 87 to the power converter 78 based on voltage reference vector signals 82a, 82b, 82c, 82d from the more than two current controllers 71, 73, 77, 79. The method comprises determining the voltage reference vector signals 82a, 82b, 82c, 82d; determining compensated voltage reference vector signals 84a, 84b, 84c, 84d indicative of a fundamental frequency of a respective voltage reference vector signal 82a, 82b, 82c, 82d; and, determining the at least one modulated drive signal 87 based on a combination of the compensated voltage reference vector signals 84a, 84b, 84c, 84d.

公开(公告)号：US20210376749A1

公开(公告)日：2021-12-02

申请号：US17278197

申请日：2019-09-11

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian BIRIS ,  Kent TANGE ,  Gert Karmishoit ANDERSEN ,  Duy Duc DOAN ,  Torsten LUND ,  Lars MEYER

IPC: H02M5/458 ,  H02P9/02

Abstract: This invention concerns a method of controlling a line side converter of a power converter system operating in an over-modulation range. The line side converter comprises a controller comprising a feedback control module configured to output a feedback control signal for modifying a drive signal received by a modulator. The method comprises determining a modulation index within the over-modulation range; and, controlling the feedback control module to adjust the feedback control signal based on the modulation index.