公开(公告)号：US11171489B2

公开(公告)日：2021-11-09

申请号：US17073864

申请日：2020-10-19

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xinyu Yu ,  Kai Xin ,  Fangcheng Liu

IPC: H02J3/38

Abstract: A control method for a string inverter, comprising: in a current/voltage (IV) curve scanning process, controlling an output power of an inverter circuit to be a specified power reference value, and controlling an output voltage of each non-IV curve scanning direct current (DC) to DC (DC-DC) circuit to be a specified voltage reference value, where the specified power reference value is less than or equal to a sum of input powers of all non-IV curve scanning DC-DC circuits the before IV curve scanning process, and where the specified voltage reference value is greater than or equal to a preset percentage of a maximum value in open-circuit voltages, before the IV curve scanning process, of photovoltaic strings connected to all IV curve scanning DC-DC circuits.

公开(公告)号：US20210036520A1

公开(公告)日：2021-02-04

申请号：US17073864

申请日：2020-10-19

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xinyu Yu ,  Kai Xin ,  Fangcheng Liu

IPC: H02J3/38

Abstract: A control method for a string inverter, comprising: in a current/voltage (IV) curve scanning process, controlling an output power of an inverter circuit to be a specified power reference value, and controlling an output voltage of each non-IV curve scanning direct current (DC) to DC (DC-DC) circuit to be a specified voltage reference value, where the specified power reference value is less than or equal to a sum of input powers of all non-IV curve scanning DC-DC circuits the before IV curve scanning process, and where the specified voltage reference value is greater than or equal to a preset percentage of a maximum value in open-circuit voltages, before the IV curve scanning process, of photovoltaic strings connected to all IV curve scanning DC-DC circuits.

公开(公告)号：US11563404B2

公开(公告)日：2023-01-24

申请号：US17035142

申请日：2020-09-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fangcheng Liu ,  Kai Xin ,  Xinyu Yu

IPC: H02S50/00 ,  H02S40/32

Abstract: One example method includes obtaining output powers at initial scanning points of photovoltaic strings in a first group and a second group. The output powers at the initial scan points of the photovoltaic strings in the first group can then be controlled to sequentially decrease, and the output powers at the initial scan points of the photovoltaic strings in the second group can then be controlled to sequentially increase. Scanning can then be performed in the initial scanning direction starting from output voltages corresponding to the output powers at the initial scan points of the first group. Scanning can then be performed in the initial scanning direction starting from output voltages corresponding to the output powers at the initial scan points of the second group, where output powers of the first group and the second group are kept to compensate each other during IV curve scanning.