公开(公告)号：US20250023456A1

公开(公告)日：2025-01-16

申请号：US18899666

申请日：2024-09-27

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Yuan YAO ,  Xinyu YU ,  Kai XIN ,  Zhaoqi CAI

IPC: H02M1/32 ,  H02J3/00 ,  H02J3/38

Abstract: Example power converters and detection methods are described. One example power converter includes a control device, a plurality of wiring terminals, a power conversion circuit, and a plurality of temperature detection devices. The control device is configured to: when an absolute value of a difference between a temperature value of one wiring terminal in the plurality of wiring terminals and a first reference temperature value is greater than or equal to a first temperature difference threshold, output a signal indicating that an abnormality occurs in the plurality of wiring terminals. In this application, a relative change of a temperature of one wiring terminal relative to another wiring terminal can be directly determined based on temperature values of the plurality of wiring terminals, thereby quickly determining, based on a magnitude of the relative change, whether there is an abnormal temperature rise caused by loose connections in the plurality of wiring terminals.

公开(公告)号：US20240088785A1

公开(公告)日：2024-03-14

申请号：US18517117

申请日：2023-11-22

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Yunfeng LIU ,  Kai XIN ,  Fuqiang XU

IPC: H02M3/07 ,  H02J3/38 ,  H02M7/487 ,  H02M7/493

CPC classification number: H02M3/07 ,  H02J3/381 ,  H02M7/487 ,  H02M7/493 ,  H02J2300/26 ,  H02M1/0054

Abstract: The embodiments provide an RSCC and a control method thereof. The RSCC includes an input capacitor, an output capacitor, N parallel RSC branches, and a controller. The controller is configured to: determine an average value of characteristic currents of N resonance units; and reduce a duty cycle of a control signal of a charging switch in a first switch unit when determining that a characteristic current of a first resonance unit is greater than the average value, where a corresponding branch is in a charging stage when the charging switch is turned on; or reduce a duty cycle of a control signal of a discharging switch in a first switch unit when determining that a characteristic current of a first resonance unit is less than the average value, where a corresponding branch is in a discharging stage when the discharging switch is turned on.

公开(公告)号：US20230402941A1

公开(公告)日：2023-12-14

申请号：US18454581

申请日：2023-08-23

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Xinyu YU ,  Kai XIN ,  Haibin GUO ,  Fuqiang XU

IPC: H02M7/5388 ,  H02M1/12 ,  H02M1/14 ,  H02M7/483

CPC classification number: H02M7/5388 ,  H02M1/12 ,  H02M1/14 ,  H02M7/483

Abstract: This application discloses a common-mode voltage adjustment method and apparatus, and a control system, and relates to the field of electronic technologies. In an example method, a controller generates an injection instruction of a first common-mode voltage based on a first modulation scheme, generates an injection instruction of a second common-mode voltage based on a second modulation scheme, and generates an injection instruction of a third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage during a modulation scheme switching period. The injection instruction of the third common-mode voltage may be used to control a inverter circuit to output the third common-mode voltage.

公开(公告)号：US20230291208A1

公开(公告)日：2023-09-14

申请号：US18316387

申请日：2023-05-12

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Kai XIN ,  Jianqiang WANG ,  Song WAN

IPC: H02J3/46 ,  H02S50/10 ,  H02J3/00

CPC classification number: H02J3/46 ,  H02S50/10 ,  H02J3/0012 ,  H02J2300/26

Abstract: The photovoltaic power generation system includes a controller and M groups of DC-DC circuits. Each group of DC-DC circuits include N DC-DC circuits, where M is a positive integer, and N is an integer greater than 1. An input end of each DC-DC circuit is connected to at least one photovoltaic unit, and each photovoltaic unit includes at least one photovoltaic module. The controller controls the N DC-DC circuits in each group of DC-DC circuits to sequentially start online IV curve scanning and controls a time interval at which two adjacent DC-DC circuits start online IV curve scanning to be less than duration of online IV curve scanning performed by one DC-DC circuit. The photovoltaic power generation system can reduce a fluctuation of a power output during online IV curve scanning, reduce duration of online IV curve scanning performed by the photovoltaic power generation system.

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：US20240022181A1

公开(公告)日：2024-01-18

申请号：US18474463

申请日：2023-09-26

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Kai XIN

IPC: H02M7/483 ,  H02J3/38 ,  H02M7/493 ,  H02M1/14

CPC classification number: H02M7/483 ,  H02J3/38 ,  H02M7/493 ,  H02M1/14 ,  H02J2300/24

Abstract: A power supply system, an inverter, and a method for controlling positive and negative bus voltages of an inverter. The power supply system includes at least one group of inverters, each group of the at least one group of inverters includes a primary inverter and at least one secondary inverter corresponding to the primary inverter, an input end of the primary inverter is coupled to a direct current power supply corresponding to the primary inverter, an input end of the secondary inverter is coupled to a direct current power supply corresponding to the secondary inverter, and a three-phase output end of the primary inverter is coupled to a three-phase output end of the secondary inverter and then is connected to an alternating current power grid.

公开(公告)号：US20230336119A1

公开(公告)日：2023-10-19

申请号：US18338770

申请日：2023-06-21

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Xinyu YU ,  Kai XIN ,  Peng DONG ,  Yongbing GAO ,  Yanzhong ZHANG

IPC: H02S40/34 ,  H02S40/32 ,  H02J3/38

CPC classification number: H02S40/32 ,  H02J3/381 ,  H02S40/34 ,  H02J2300/26

Abstract: An example system includes an inverter and at least one combiner box. The combiner box includes a plurality of direct current-direct current (DC-DC) circuits and one controller. The controller is configured to: when an output voltage of the combiner box is greater than or equal to a first preset voltage and less than or equal to a second preset voltage, control the combiner box to output a maximum power. When the output voltage of the combiner box is greater than the second preset voltage, the controller controls an output power of the combiner box to decrease as the output voltage increases. The second preset voltage is greater than the first preset voltage, and the maximum power is a sum of maximum powers of all photovoltaic strings connected to the combiner box.

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：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：US20240333172A1

公开(公告)日：2024-10-03

申请号：US18658932

申请日：2024-05-08

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Yi DU ,  Xinyu YU ,  Kai XIN ,  Yunfeng LIU

IPC: H02M7/48 ,  H02J3/16 ,  H02J3/38

CPC classification number: H02M7/48 ,  H02J3/16 ,  H02J3/381 ,  H02J2300/24

Abstract: Examples of power conversion devices and control methods are described. In one example, a power conversion device includes direct current buses, an inverter circuit, and a controller. After the power conversion device switches from a high voltage ride through state to a low voltage ride through state, the controller controls a change rate of an output active current of the inverter circuit to be a first change rate in a first time interval and a second change rate in a second time interval respectively in a low voltage ride through reactive current response process. The second change rate is greater than the first change rate. A sum of first interval duration of the first time interval and second interval duration of the second time interval is less than or equal to a low voltage ride through reactive current response duration threshold.