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11.发明公开公开(公告)号：US20240283241A1
公开(公告)日：2024-08-22
申请号：US18650464
申请日：2024-04-30
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xiufeng ZHANG , Yanzhong ZHANG
CPC classification number: H02H7/268 , H02J3/381 , H02S40/34 , H02J2300/26
Abstract: A photovoltaic power generation system includes a protection switch and a plurality of DC-DC converters. Each DC-DC converter includes a direct current bus, a DC-DC circuit, and at least one input interface. The input interface is configured to connect to a photovoltaic unit. The photovoltaic unit includes at least one photovoltaic module. The input interface is connected to the direct current bus by using the protection switch, the direct current bus is connected to an input end of the DC-DC circuit, and an output end of the DC-DC circuit is an output end of the DC-DC converter. The protection switch includes a release device and a switching device that are connected in series. The release device is configured to: when a short-circuit fault occurs on a line in which the release device is located, control the switching device to be disconnected.
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公开(公告)号：US20240097615A1
公开(公告)日：2024-03-21
申请号：US18520763
申请日：2023-11-28
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Yanzhong ZHANG , Zhiwu XU , Chongyue HUANG
CPC classification number: H02S40/32 , H02J3/38 , H02S10/00 , H02J2300/24
Abstract: A photovoltaic power generation system includes a single-stage inverter, an anti-backflow circuit, a photovoltaic string, and a coupling capacitor. The anti-backflow circuit is connected to one input end of the single-stage inverter, one output end of the photovoltaic string is connected to the other input end of the single-stage inverter, and the other output end of the photovoltaic string is connected to the anti-backflow circuit. The photovoltaic string includes a buck optimizer and a photovoltaic panel. The anti-backflow circuit is configured to prevent a backflow current from flowing back to the photovoltaic string. The coupling capacitor is connected in parallel to two ends of the anti-backflow circuit and is configured to transmit a signal between each buck optimizer in the photovoltaic string and the single-stage inverter, to control backflow of the backflow current when the anti-backflow circuit fails.
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公开(公告)号：US20230299579A1
公开(公告)日：2023-09-21
申请号：US18324403
申请日：2023-05-26
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Zhiwu XU , Hongmiao FANG , Yanzhong ZHANG , Changshuan SUN , Tiansan LIN
CPC classification number: H02J3/00125 , H02J13/00002 , H02J13/0004 , H02J2300/24
Abstract: A power supply system including three output ends of a power converter respectively connected to a first end of a positive/negative direct current bus and a first end of a neutral bus; two input ends of a first inverter respectively connected to a second end of the positive direct current bus and a second end of the neutral bus; two input ends of a second inverter respectively connected to a second end of the neutral bus and a second end of the negative direct current bus; a controller outputs an overvoltage alarm signal when at least one of the following conditions is met: a to-ground voltage of the positive/ negative direct current bus or a to-ground voltage of the neutral bus is greater than or equal to the preset threshold.
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14.发明申请公开(公告)号：US20220320870A1
公开(公告)日：2022-10-06
申请号：US17709059
申请日：2022-03-30
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xiufeng ZHANG , Yanzhong ZHANG
IPC: H02J3/38
Abstract: A direct current power supply system includes N power supply devices, N triple-pole direct current switches, a positive bus, an M bus, and a negative bus. A positive input terminal of an ith triple-pole direct current switch is coupled to a first output terminal of an ith power supply device, an M input terminal of the ith triple-pole direct current switch is coupled to a second output terminal of the ith power supply device, a negative input terminal of the ith triple-pole direct current switch is coupled to a third output terminal of the ith power supply device, a positive output terminal of the ith triple-pole direct current switch is coupled to the positive bus, an M input terminal of the ith triple-pole direct current switch is coupled to the M bus, and a negative output terminal of the ith triple-pole direct current switch is coupled to the negative bus.
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公开(公告)号：US20220200290A1
公开(公告)日：2022-06-23
申请号：US17694085
申请日：2022-03-14
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Yanzhong ZHANG , Yongbing GAO , Xun WANG , Roland HUEMPFNER
Abstract: A power system is disclosed. Output terminals of a power supply or a DC-to-DC unit are cascaded to increase an output voltage, so as to reduce a current between the power supply or the DC-to-DC unit and the DC-to-AC unit, and resolve cost and loss problems of the cable from the power supply or the DC-to-DC unit to the DC-to-AC unit. In addition, according to the power system provided in the embodiments of this application, a quantity of cables from the power supply or the DC-to-DC unit to the DC-to-AC unit may be further reduced by cascading output terminals of the power supply or the DC-to-DC unit and cascading inputs of the DC-to-AC unit, thereby reducing system costs. In addition, in the power system provided in the embodiments of this application, cascaded input and isolated output of the DC-to-AC unit can reduce a specification of a power conversion device.
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Patent Agency Ranking
公开(公告)号：US20230411961A1
公开(公告)日：2023-12-21
申请号：US18240449
申请日：2023-08-31
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Shuchao WANG , Yanbai SHEN , Yanzhong ZHANG
Abstract: This application discloses a method for implementing a fast power response and a power plant. The method is applied to a power plant-end power control apparatus, and includes determining a whole-plant reactive power target value and/or a whole-plant active power target value of the power plant. The method also includes determining, based on the whole-plant reactive power target value and/or the whole-plant active power target value, a second power control instruction readable to each photovoltaic inverter or power conversion system in the power plant. The method further includes delivering, through a subarray controller or a subarray communication device over an Ethernet network and/or a field bus network, the second power control instruction to each photovoltaic inverter or power conversion system indicated by address identifier information carried in the second power control instruction, so that each photovoltaic inverter or power conversion system makes a fast power response based on the second power control instruction.
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公开(公告)号：US20230387823A1
公开(公告)日：2023-11-30
申请号：US18231925
申请日：2023-08-09
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Lin LIU , Yanzhong ZHANG , Zhangrui CHEN , Zhenhuan SHU
Abstract: Embodiments of this application provide an inverter apparatus and an inverter system. In the inverter apparatus, a direct current output end of an alternating and direct current distribution cabinet is connected to a first direct current input end of an inverter. A first alternating current output end of the inverter is connected to an alternating current input end of the alternating and direct current distribution cabinet, and the alternating and direct current distribution cabinet outputs a converged alternating current. In this way, on-site wiring is simplified, and on-site maintenance is reduced to some extent.
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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
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.
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公开(公告)号：US20220385231A1
公开(公告)日：2022-12-01
申请号：US17826475
申请日：2022-05-27
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: A power converter box and at least one junction box are integrated on a backplane of the photovoltaic module as a whole, and there is a cable for connecting the power converter and the junction box. In this case, relative to the conventional technology in which a junction box is independent of a power converter, a length of a cable used when the junction box and the power converter box are taken as a whole is shorter than a length of a cable used in the conventional technology. In this case, compared with the conventional technology in which a cable is connected to an independently placed power converter, the power converter only needs to establish a connection relationship by using a solder ribbon, a circuit board cable, and the like with low costs, so that production costs are low.
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公开(公告)号：US20220337176A1
公开(公告)日：2022-10-20
申请号：US17854424
申请日：2022-06-30
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Dong CHEN , Yanzhong ZHANG , Lei SHI
IPC: H02M7/5387 , H02M1/08 , H02M1/00 , H02M7/483
Abstract: Embodiments of this application disclose an inverter apparatus and an inverter apparatus control method. The inverter apparatus includes an inverter circuit and a control unit, and the control unit detects a driving mode of the inverter circuit based on a running state of the inverter circuit. When the inverter circuit outputs reactive power and an output current amplitude is greater than a current threshold, the control unit controls the inverter circuit in a full-bridge two-level bipolar control mode; and in other cases, the control unit controls the inverter circuit in a three-level control mode. This reduces a risk of breaking down horizontal bridge semiconductor switching devices by a voltage spike in an active turn-off process.
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