公开(公告)号：US20200328697A1

公开(公告)日：2020-10-15

申请号：US16911600

申请日：2020-06-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fangcheng LIU ,  Kai XIN ,  Yunfeng LIU

IPC: H02M7/49 ,  H02S40/32

Abstract: A control method and apparatus for a single-phase five-level converter are provided. The method includes: obtaining a first-phase initial modulated wave and a second-phase initial modulated wave of the single-phase five-level converter; obtaining a first-level modulated wave, a second-level modulated wave, a third-level modulated wave, a fourth-level modulated wave, and a fifth-level modulated wave that are output by the single-phase five-level converter; calculating the first-level modulated wave, the second-level modulated wave, the third-level modulated wave, the fourth-level modulated wave, the fifth-level modulated wave, the first-phase initial modulated wave, and the second-phase initial modulated wave, to obtain a common-mode modulated wave of the single-phase five-level converter; and calculating the first-phase initial modulated wave, the second-phase initial modulated wave, and the common-mode modulated wave, to obtain a pulse-width modulated wave of the single-phase five-level converter. Implementing the embodiments of this application can increase a system response speed and improve system reliability.

公开(公告)号：US20180166883A1

公开(公告)日：2018-06-14

申请号：US15893125

申请日：2018-02-09

Applicant: Huawei Technologies Co., Ltd.

Inventor： Kai XIN ,  Haibin GUO ,  Yongbing GAO

IPC: H02J3/38

CPC classification number: H02J3/385 ,  H02J3/38 ,  H02J3/383 ,  H02J2003/001 ,  H02M7/5395 ,  H02S40/32 ,  Y02E10/563 ,  Y02E10/58

Abstract: The present application provides a low voltage ride-through control system for a multi-inverter grid-connected power converter, including: a photovoltaic array and an inverter. The inverter includes a DC/DC conversion unit and a DC/AC inversion unit connected to an output end of the DC/DC conversion unit, an input end of the DC/DC conversion unit is connected to an output end of the photovoltaic array, and the inverter is connected to a power grid at a grid-connected point. The inverter further includes a low voltage ride-through detection unit and a low voltage ride-through control unit. The low voltage ride-through detection unit is configured to determine whether to trigger low voltage ride-through. The low voltage ride-through control unit is configured to lower an input voltage of the DC/DC conversion unit when it is determined to trigger the low voltage ride-through, to lower an output voltage of the photovoltaic array.