公开(公告)号：US20240243604A1

公开(公告)日：2024-07-18

申请号：US18413345

申请日：2024-01-16

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Siwei YANG ,  Haibin GUO ,  Shaohui ZHONG ,  Yuandong MENG

IPC: H02J7/04 ,  H02M1/088 ,  H02M3/335

CPC classification number: H02J7/04 ,  H02M1/088 ,  H02M3/33573 ,  H02M3/33584 ,  H02J2207/20

Abstract: A power conversion circuit includes a controller, a first-level DC/DC conversion circuit, a plurality of second-level DC/DC conversion circuits, a switching module, a first capacitor, a plurality of second capacitors, and a battery. When a voltage of the battery is less than a first voltage threshold and voltages of the first capacitor and the second capacitor are less than a third voltage threshold, the controller controls the switching module to be turned off or turned on, so that the plurality of second-level DC/DC conversion circuits are connected in series; or when the voltage of the battery is greater than a second voltage threshold and voltages at two ends of the first capacitor and the second capacitor are less than the third voltage threshold, the controller controls the switching module to be turned off or turned on, so that the plurality of second-level DC/DC conversion circuits are connected in parallel.

公开(公告)号：US20240128745A1

公开(公告)日：2024-04-18

申请号：US18398776

申请日：2023-12-28

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Yuanzheng CAO ,  Lin LI ,  Haibin GUO

IPC: H02J1/06

CPC classification number: H02J1/06

Abstract: A system for controlling a direct current bus voltage includes a controller and an inverter. The controller is configured to: obtain a power grid voltage; obtain a maximum sampling value of a direct current bus voltage of the inverter when the power grid voltage jumps, where the maximum sampling value of the direct current bus voltage is a maximum voltage value on the direct current bus in a time period for detecting a power grid voltage jump; obtain a first direct current bus voltage reference value based on the maximum sampling value of the direct current bus voltage; and obtain a second direct current bus voltage reference value based on the first direct current bus voltage reference value and a preset first rising gradient value, to limit a rising rate of the direct current bus voltage.

公开(公告)号：US20230110231A1

公开(公告)日：2023-04-13

申请号：US17959505

申请日：2022-10-04

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Lin LI ,  Haibin GUO ,  He ZHOU

IPC: H01M10/42 ,  H02J7/00 ,  H01M10/48 ,  H01M10/44 ,  H02M3/158

Abstract: An energy storage system and a control method thereof, so that a voltage level of an energy storage module in the energy storage system can be flexibly matched and the energy storage module can be effectively controlled based on a voltage of a direct current bus, to implement a high response speed. The energy storage system includes a plurality of energy storage modules, and each of the plurality of energy storage modules is connected to the direct current bus. The energy storage module includes a plurality of battery clusters and a plurality of first direct current-direct current converters. The battery cluster is configured to provide a direct current to the first direct current-direct current converter, or store a direct current transmitted by the first direct current-direct current converter.

公开(公告)号：US20220255461A1

公开(公告)日：2022-08-11

申请号：US17669111

申请日：2022-02-10

Applicant: Huawei Digital Power Technologies Co., Ltd

Inventor： Lin LI ,  Zhiwu XU ,  Haibin GUO

IPC: H02M7/5387 ,  H02M1/00 ,  H02J3/38

Abstract: A voltage source inverter includes a bus capacitor, a bidirectional power tube, a filter inductor, and a filter capacitor. A voltage control method includes: respectively obtaining a first feedback current and a first feedback voltage from an output end of the filter inductor and an output end of the filter capacitor; obtaining a first duty cycle and a second duty cycle based on the first feedback current, a maximum current reference value, and a minimum current reference value in a current loop; obtaining a third duty cycle based on the first feedback voltage and a voltage reference value in a voltage loop; and selecting one of the first duty cycle, the second duty cycle, and the third duty cycle, and controlling the bidirectional power tube, so that a duty cycle of the bidirectional power tube is between the first duty cycle and the second duty cycle.

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.