公开(公告)号：US20230378758A1

公开(公告)日：2023-11-23

申请号：US18366102

申请日：2023-08-07

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Huan ZHAO

IPC: H02J3/38

CPC classification number: H02J3/38 ,  H02J2300/24

Abstract: A control system and method for a power supply system. The control system includes a front controller and a front voltage conversion circuit and a post controller and a post voltage conversion circuit. The front voltage conversion apparatus is configured to supply power to the post voltage conversion apparatus through a direct current bus. The post voltage conversion apparatus is configured to: receive electric energy transmitted by the front voltage conversion apparatus through the direct current bus, and supply power to a power grid. The post controller is further configured to transmit, to the front controller through the direct current bus, information indicating that high voltage ride-through occurs on the power grid. Voltage control on the direct current bus does not need to depend on the high-speed communication cable, thereby improving control efficiency of a power supply system.

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：US20230223902A1

公开(公告)日：2023-07-13

申请号：US18187882

申请日：2023-03-22

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Boping YANG ,  Huan ZHAO

IPC: H02S50/10

CPC classification number: H02S50/10

Abstract: A photovoltaic power generation system and a method and a device for detecting an earth fault of a photovoltaic string. The controller obtains a terminal voltage of each photovoltaic string before voltage disturbance, where the terminal voltage is a voltage to earth of a positive electrode or negative electrode of the photovoltaic string; performs voltage disturbance on each photovoltaic string and obtains a terminal voltage of each photovoltaic string after the voltage disturbance; determines a photovoltaic string with an earth fault based on the terminal voltage of each photovoltaic string before and after the voltage disturbance; obtains a photovoltaic panel with an earth fault by using the terminal voltage and an output voltage of the photovoltaic string before the voltage disturbance, or obtains a photovoltaic panel with an earth fault by using the terminal voltage and an output voltage of the photovoltaic string after the voltage disturbance.

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.