公开(公告)号：US20230071656A1

公开(公告)日：2023-03-09

申请号：US17940191

申请日：2022-09-08

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Yongquan LIU ,  Guilei GU ,  Gang XIAO ,  Dili ZHU

IPC: H02H7/122 ,  H02S40/32

Abstract: A photovoltaic system, an inverter, and a direct current electric arc detection method. The system includes an inverter, a controller, and at least two converters. When detecting an electric arc, the controller controls an input current of the inverter to decrease to extinguish the arc. After the arc is extinguished, the controller controls an output voltage of at least one photovoltaic string to decrease to a first preset voltage, where the first preset voltage is less than an input voltage of the inverter when the electric arc is detected, or controls a maximum value of an output current of the at least one photovoltaic string to be a second preset current, where the second preset current is less than the input current of the inverter when the electric arc is detected. In the foregoing two recovery manners, no electric arc recurs.

公开(公告)号：US20230208182A1

公开(公告)日：2023-06-29

申请号：US18170606

申请日：2023-02-17

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Dong CHEN ,  Zhen CAO ,  Yongquan LIU ,  Xiaofeng YAO

IPC: H02J7/35 ,  H02J3/00

CPC classification number: H02J7/35 ,  H02J3/002 ,  H02J2300/26

Abstract: A power supply system and method. The power supply system includes: a first branch on which a first string is located, a second branch on which a second string is located, a transfer switch unit, a first voltage compensation unit, and a controller. The transfer switch unit is configured to connect the first voltage compensation unit to the first branch based on a voltage compensation enabling signal received from the controller, where the voltage compensation enabling signal is generated by the controller based on an operating state parameter of the first string and an operating state parameter of the second string. The first voltage compensation unit is configured to compensate for an output voltage of the first branch. Thus the system and method can prevent the voltage compensation unit from causing an unnecessary system loss in the branch requiring no voltage compensation, and reduce system costs.