公开(公告)号：US20220252657A1

公开(公告)日：2022-08-11

申请号：US17667297

申请日：2022-02-08

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Haibin GUO ,  Huan ZHAO ,  Zhiwu XU ,  Lin LI

IPC: G01R31/14 ,  H02M1/00

Abstract: A converter system includes a plurality of converters, a sampling circuit, and a control circuit. The plurality of converters are connected in parallel. Each converter includes a detection circuit which includes a first switch and at least two resistors. The first switch is connected in parallel with one of the at least two resistors. The control circuit control the sampling circuit to collect a first voltage and a second voltage, where the first voltage is a voltage that is between a second bus and a ground cable and that is collected by the sampling circuit when first switches in detection circuits of a first quantity are in a turn-on state, the second voltage is a voltage that is between the second bus and the ground cable and that is collected by the sampling circuit when first switches in detection circuits of a second quantity are in a turn-on state.

公开(公告)号：US20230378764A1

公开(公告)日：2023-11-23

申请号：US18229289

申请日：2023-08-02

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhiwu XU ,  Lin LI ,  Guowei GUO

IPC: H02J3/38 ,  H02M7/44 ,  H02M1/32 ,  H02M1/36

CPC classification number: H02J3/388 ,  H02M7/44 ,  H02M1/32 ,  H02M1/36

Abstract: Embodiments of this application relate to the field of control technologies, and provide a control method and a distributed power system. The method includes: controlling an inverter to work in a current source mode, where the current source mode means that the inverter serves as a current source to convert a direct current generated by a power supply device into an alternating current and output the alternating current to the alternating current grid; and controlling the inverter to switch from the current source mode to a voltage source mode when it is detected that a voltage at a first target port jumps. In this way, an output voltage of the inverter may be controlled within a safety range, so that a local load can be protected before a cause of an abnormal voltage is detected, and comparatively, power may be continuously supplied to the local load.

公开(公告)号：US20230387693A1

公开(公告)日：2023-11-30

申请号：US18365034

申请日：2023-08-03

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Zhiwu XU ,  Lin LI ,  Huan ZHAO

IPC: H02J3/38 ,  H02S40/32

CPC classification number: H02J3/381 ,  H02S40/32 ,  H02J2300/24

Abstract: This application provides a photovoltaic system and a power supply current control method thereof. The photovoltaic system includes a direct current bus and at least two power supply units connected in parallel to the direct current bus. The power supply current control method of a photovoltaic system includes: obtaining a current power supply state parameter of each of the at least two power supply units, determining a reference power supply current value of each power supply unit based on the current power supply state parameter of each power supply unit, and adjusting a current supply power of each power supply unit based on the reference power supply current value of each power supply unit. According to this application, appropriate load distribution between power supply units can be ensured, and applicability is high.

公开(公告)号：US20230238896A1

公开(公告)日：2023-07-27

申请号：US18179098

申请日：2023-03-06

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Fei XU ,  Xinyu YU ,  Kai XIN ,  Zhiwu XU ,  Lin LI ,  Haibin GUO

IPC: H02M7/487 ,  H02M7/5387 ,  H02M1/12

CPC classification number: H02M7/487 ,  H02M7/53871 ,  H02M1/12 ,  H02J2300/24

Abstract: Example three-level inverters, control methods, and systems are provided. One example three-level inverter includes a first bus capacitor, a second bus capacitor, a power conversion circuit, and a controller. The first bus capacitor is connected in the middle of the current bus and the power conversion circuit. The power conversion circuit is configured to convert a direct current into a three-phase alternating current for output. The controller is configured to determine a balance reference by using a difference between absolute values of voltages of the positive and negative direct current buses and an even harmonic current in a grid-connected current, where the balance reference is used to enable the three-level inverter to generate a current signal for balancing the voltages of the positive and negative direct current buses.

公开(公告)号：US20220285950A1

公开(公告)日：2022-09-08

申请号：US17687335

申请日：2022-03-04

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Hualei JU ,  Lin LI ,  Haibin GUO

IPC: H02J7/00

Abstract: An energy storage system includes a battery cluster, a battery control system, at least two first power conversion modules, a bus, and a second power conversion module. A plurality of battery packs in the battery cluster are connected in parallel to the bus through the at least two first power conversion modules, one end of the second power conversion module is connected in parallel to the battery cluster, and the other end of the second power conversion module is connected to a load or a power grid. The battery control system obtains a target current value that needs to be provided by the second power conversion module to the load or the power grid. In this application, the battery parameters of the battery packs can be equalized, or the battery cluster is enabled to output the target power, so that system stability is improved.