公开(公告)号：US20240106351A1

公开(公告)日：2024-03-28

申请号：US18523539

申请日：2023-11-29

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Xinyu YU ,  Junjie LI ,  Kai XIN

IPC: H02M7/5387 ,  H02M1/00 ,  H02M1/12 ,  H02M7/5395

CPC classification number: H02M7/53871 ,  H02M1/0067 ,  H02M1/123 ,  H02M7/5395

Abstract: A multi-inverter parallel system are provided. The system includes a first inverter and a second inverter. The first inverter includes a first controller, a first inverter circuit, and a first relay. The second inverter includes a second controller, a second inverter circuit, and a second relay. Phases of an output end of the first inverter circuit are correspondingly connected to phases of an output end of the second inverter circuit. The first controller may control the first relay to be turned on. The second controller may control, when the second relay is turned off, a direct current bus voltage of the second inverter circuit to be the same as a direct current bus voltage of the first inverter circuit, and control a common-mode voltage injection manner of the second inverter circuit to be the same as a common-mode voltage injection manner of the first inverter circuit.

公开(公告)号：US20230147775A1

公开(公告)日：2023-05-11

申请号：US18154277

申请日：2023-01-13

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Kai XIN ,  Peng DONG ,  Junjie LI

IPC: H02M7/5387 ,  H02M7/5395 ,  H02M1/12

CPC classification number: H02M7/53873 ,  H02M7/5395 ,  H02M1/123

Abstract: A common-mode voltage injection control method and apparatus for an inverter. For the method and apparatus, a common-mode voltage for a DPWM mode is calculated based on three-phase port voltages and an output power command; a common-mode voltage for an MPC modulation mode is calculated based on the direct current bus voltage, the three-phase port voltages, and the output power command; a modulation proportion is determined based on a maximum phase voltage peak value of the three-phase port voltages, the direct current bus voltage, and a power factor of the output power command; and a common-mode injection voltage is generated based on the common-mode voltage for the DPWM mode, the modulation proportion, and the common-mode voltage for the MPC modulation mode.

公开(公告)号：US20230318440A1

公开(公告)日：2023-10-05

申请号：US18329896

申请日：2023-06-06

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Kai XIN ,  Zhiwu XU ,  Yanzhong ZHANG ,  Junjie LI

IPC: H02M1/12 ,  H02M7/493

CPC classification number: H02M1/123 ,  H02M7/493

Abstract: A method and apparatus for suppressing cross current including: obtaining a common-mode current and a common-mode injection voltage of each inverter in an inverter parallel system; determining a virtual damping voltage of each inverter based on the common-mode current of each inverter and a preset common-mode damping factor, where if a direction in which a current flows out of the inverter is a positive direction, the preset common-mode damping factor is a negative value, or if a direction in which a current flows into the inverter is a positive direction, the preset common-mode damping factor is a positive value; superimposing the virtual damping voltage on the common-mode injection voltage of each inverter, to obtain a target common-mode voltage of each inverter; and controlling operation of each inverter based on the target common-mode voltage of each inverter and a differential mode voltage of each inverter.

公开(公告)号：US20220294336A1

公开(公告)日：2022-09-15

申请号：US17693221

申请日：2022-03-11

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Kai XIN ,  Junjie LI

IPC: H02M1/32 ,  H02M7/44

Abstract: A power supply system and a method for controlling the power supply system includes a direct current voltage conversion apparatus, an inverter, and a diode. The direct current voltage conversion apparatus includes a controller and a direct current voltage conversion circuit. The controller is configured to: control the output voltage of the direct current voltage conversion circuit, so that the diode is in a conducted state; detect a voltage on the direct current bus; and determine, based on the voltage on the direct current bus, whether high voltage ride-through occurs in the power supply system. According to the power supply system and the method for controlling the power supply system provided in this application, high voltage ride-through can be quickly detected while fault isolation is implemented, thereby improving efficiency of detecting high voltage ride-through.

公开(公告)号：US20220117123A1

公开(公告)日：2022-04-14

申请号：US17558917

申请日：2021-12-22

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Junjie LI ,  Xinyu YU ,  Kai XIN ,  Jiaguang FU

IPC: H05K7/20

Abstract: Embodiments of this application disclose a heat dissipating element control method, including: obtaining a status parameter set and a detected temperature of a first device, where the status parameter set is associated with a running temperature of the first device; determining values of a first temperature parameter and a second temperature parameter in a target adjustment function based on the status parameter set; and determining the heat dissipating efficiency of the heat dissipating element based on the values of the first temperature parameter and the second temperature parameter and the detected temperature, and controlling running of the heat dissipating element. This resolves a problem that the heat dissipating efficiency is not adjusted in time because the detected temperature is unable to reflect an actual temperature in real time.