公开(公告)号：US20210328435A1

公开(公告)日：2021-10-21

申请号：US17360245

申请日：2021-06-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yanzhong ZHANG ,  Xun WANG

IPC: H02J3/38 ,  H02M7/48 ,  H02M3/156

Abstract: This application discloses an inverter, including: a direct-current conversion unit, a busbar unit, and an inversion unit. The direct-current conversion unit includes a first positive input terminal, a first negative input terminal, a second positive input terminal, a second negative input terminal, a first direct current DC-to-DC module, a second DC-to-DC module, a first on/off control device, a second on/off control device, a first switch, and a second switch. The first positive input terminal and the first negative input terminal are configured to connect a first photovoltaic string, the second positive input terminal and the second negative input terminal are configured to connect a second photovoltaic string, and a connection relationship of a circuit in the direct-current conversion unit can be changed based on combinations of turning-on or turning-off of the first switch and the second switch.

公开(公告)号：US20220006299A1

公开(公告)日：2022-01-06

申请号：US17478561

申请日：2021-09-17

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yanzhong ZHANG ,  Xun WANG

IPC: H02J3/46 ,  H02J3/32 ,  H02J7/00 ,  H02J3/34 ,  H02J3/38

Abstract: The present invention discloses an energy storage system. The energy storage system includes M cell strings, N energy storage converters, first ends of the N energy storage converters are coupled to at least one of the M cell strings, and second ends of the N energy storage converters are configured to connect to a power grid. A first end of a first energy storage converter is coupled to Q cell strings in the M cell strings, and the first energy storage converter includes a DC/AC conversion unit and at least one DC/DC conversion unit. A first DC/DC conversion unit is coupled to at least one of the Q cell strings by using the first end of the first energy storage converter, the first DC/DC conversion unit is coupled to the DC/AC conversion unit, and the DC/AC conversion unit is coupled to the power grid by using a second end of the first energy storage converter. The first DC/DC conversion unit is configured to perform adaptation between a voltage of the DC/AC conversion unit and a voltage of a cell string. Therefore, a cell capacity is fully used, and a waste of the cell capacity is reduced.

公开(公告)号：US20210391709A1

公开(公告)日：2021-12-16

申请号：US17446492

申请日：2021-08-31

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xun WANG ,  Zhen CAO ,  Yongbing GAO

IPC: H02H7/122 ,  H02H1/00 ,  H02M7/44 ,  H02H9/02 ,  H02M3/04

Abstract: A breaker apparatus and an inverter system are configured to disconnect an electrical connection when a fault occurs in a protected circuit. The breaker apparatus is connected in series in a protected circuit, and is configured to disconnect the electrical connection when a fault occurs in the protected circuit. The breaker apparatus includes a first branch, and a second branch. The first branch includes an overcurrent-automatic-disconnection unit and a first current limiting unit that are connected in series, where the overcurrent-automatic-disconnection unit is configured to be automatically disconnected when a current flowing through the overcurrent-automatic-disconnection unit exceeds a breaking current threshold. The a second branch is configured to be open or closed under control of the controller. The controller is configured to control the first controllable switch unit to be closed when the protected circuit operates normally, and control the first controllable switch unit to be open when a fault occurs in the protected circuit.

公开(公告)号：US20210328546A1

公开(公告)日：2021-10-21

申请号：US17359011

申请日：2021-06-25

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xun WANG ,  Yanzhong ZHANG

IPC: H02S40/36 ,  H01C10/50 ,  H02H5/00

Abstract: This application discloses a photovoltaic direct-current breaking apparatus, including a positive connection terminal and a negative connection terminal for connecting a photovoltaic string and a photovoltaic energy converter, a first diode, a first switch, a convector circuit, and an energy absorption circuit, where the first switch, the convector circuit, and the energy absorption circuit are connected in parallel. The convector circuit can effectively avoid arc discharge and ablation generated when the first switch cuts off a direct-current circuit between the photovoltaic string and the photovoltaic energy converter. The first diode can effectively bypass energy stored by an energy storage device in the photovoltaic energy converter, helping reduce required specifications of a semiconductor device in the convector circuit. The energy absorption circuit can also effectively reduce required specifications of the semiconductor device and a varistor.

公开(公告)号：US20210313808A1

公开(公告)日：2021-10-07

申请号：US17353925

申请日：2021-06-22

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yanzhong ZHANG ,  Zhenhuan SHU ,  Xun WANG

IPC: H02J3/38

Abstract: This application relates to the field of power technologies, and provides a photovoltaic system, which can increase a working voltage of a photovoltaic string. The photovoltaic system includes an adapter circuit, a first photovoltaic string, a second photovoltaic string, and a controller. The controller includes an inverter or a combiner box. The first photovoltaic string and the second photovoltaic string are configured to provide electric energy for the controller. The adapter circuit is configured to be connected to the first photovoltaic string in series, and further configured to connect the second photovoltaic string to the first photovoltaic string in series when a voltage of the first photovoltaic string is lower than a preset threshold.