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公开(公告)号：US20220166377A1
公开(公告)日：2022-05-26
申请号：US17669724
申请日：2022-02-11
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Jianqiang WANG , Song WAN , Yanzhong ZHANG , Yongbing GAO
Abstract: This application discloses a method and an apparatus for detecting a solar cell of a photovoltaic plant. The method includes: obtaining a first infrared image and a second infrared image, where the first infrared image includes infrared image information corresponding to an ambient infrared signal reflected by a to-be-detected solar cell operating in a short-circuit state, the second infrared image includes infrared image information corresponding to an infrared signal emitted by the to-be-detected solar cell operating in a first state and infrared image information corresponding to an ambient infrared signal reflected by the to-be-detected solar cell, and the first state is another state other than the short-circuit state; and detecting, based on the first infrared image and the second infrared image, whether the to-be-detected solar cell has a defect.
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公开(公告)号：US20250158386A1
公开(公告)日：2025-05-15
申请号：US18917734
申请日：2024-10-16
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Yongbing GAO , Xiaoxiang Zhou , Junsong Tang , Zhuang Sun , Wangjie Xie , Yong Xu , Tao Shi , He Zhou
Abstract: A power supply system includes a power conditioning apparatus, a transformer, and a controller. The power conditioning apparatus includes an inverter circuit, at least one grid-connected switch, a voltage-to-ground detector. The inverter circuit is configured to connect to the inverter circuit is configured to connect to the transformer through the at least one grid-connected switch, and the transformer is configured to connect to a power grid. When one grid-connected switch is turned off and turned on, the voltage-to-ground detector detects voltage to grounds of the power conditioning apparatus to obtain a first voltage value and a second voltage value respectively. The controller outputs alarm information for grounding of a neutral wire of the transformer or controls the power conditioning apparatus to stop working when a difference between the second voltage value and the first voltage value falls within a preset voltage range.
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公开(公告)号：US20240088828A1
公开(公告)日：2024-03-14
申请号：US18517118
申请日：2023-11-22
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Dong CHEN , Yanzhong ZHANG , Yongbing GAO , Lei SHI
CPC classification number: H02S40/32 , H02M1/0006 , H02M1/0009 , H02M1/088 , H02S40/34 , H02S40/38
Abstract: A photovoltaic power generation system and a conversion circuit. Two groups of photovoltaic arrays are cascaded by using the conversion circuit disposed in the photovoltaic power generation system to effectively increase an input voltage of a DC/AC conversion circuit. In this way, a cable with an existing diameter specification can improve current transmission in the photovoltaic power generation system, to effectively reduce costs of the photovoltaic power generation system. A voltage to earth at an intermediate node in the conversion circuit is adjusted to a first preset value, so that both an absolute value of a voltage to earth of a first group of photovoltaic arrays and an absolute value of a voltage to earth of a second group of photovoltaic arrays are less than a first threshold.
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14.发明公开公开(公告)号：US20240014684A1
公开(公告)日：2024-01-11
申请号：US18473022
申请日：2023-09-22
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Dong CHEN , Yongbing GAO , Xun WANG
CPC classification number: H02J13/00002 , G05B9/02
Abstract: A power sourcing equipment includes a residual current detection unit, a voltage detection unit, and a controller. The controller determines an insulation resistance value at the input end of the power sourcing equipment based on a first preset voltage parameter value, a first residual current value, a second preset voltage parameter value, and a second residual current value. The first residual current value is a residual current value of the power sourcing equipment when a voltage parameter of the power sourcing equipment includes the first preset voltage parameter value. The second residual current value is a residual current value of the power sourcing equipment when the voltage parameter of the power sourcing equipment includes the second preset voltage parameter value.
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15.发明公开公开(公告)号：US20240014664A1
公开(公告)日：2024-01-11
申请号：US18474453
申请日：2023-09-26
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Dong CHEN , Yongbing GAO , Lei SHI
CPC classification number: H02J3/381 , H02J3/46 , H02J2300/24
Abstract: A power supply system includes direct current combiner boxes and an inverter, where output terminals of all direct current combiner boxes are connected in series and/or in parallel and then coupled to an input terminal of the inverter, and the direct current combiner box includes a controller, a detection circuit, and a direct current conversion circuit. The direct current conversion circuit performs direct current conversion on an input terminal voltage of the direct current combiner box to obtain an output terminal voltage of the direct current combiner box. The detection circuit detects an output terminal parameter of the direct current combiner box, and sends the output terminal parameter of the direct current combiner box to the controller. The controller controls an output voltage of the direct current conversion circuit based on the output terminal parameter of the direct current combiner box.
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Patent Agency Ranking
公开(公告)号：US20230402972A1
公开(公告)日：2023-12-14
申请号：US18450528
申请日：2023-08-16
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Jianfei LIN , Yongbing GAO , Tiansan LIN
CPC classification number: H02S50/00 , G01R31/14 , H02J1/10 , H02J2300/24
Abstract: A photovoltaic system, a power supply system, and an insulation fault detection method. An insulation impedance detection circuit is connected between a bus and the ground. The bus includes the direct current positive bus, the neutral bus, or the direct current negative bus. The insulation impedance detection circuit includes at least a switch. The direct current negative bus is connected to the neutral bus by using an electrical element or a voltage source. A controller obtains insulation impedance based on voltages to ground of the bus that are separately corresponding to the switch before and after the switch is turned on, and determines, based on the insulation impedance, whether there is an insulation fault in the photovoltaic system, to perform protection in a timely manner.
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公开(公告)号：US20230308009A1
公开(公告)日：2023-09-28
申请号：US18328140
申请日：2023-06-02
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu YU , Kai XIN , Yanzhong ZHANG , Yongbing GAO
CPC classification number: H02M1/32 , H02M7/493 , H02J2300/24 , H02J3/381
Abstract: A photovoltaic system and a circulating current suppression method. The system includes a controller and at least two inverters. A direct current input terminal of each inverter is connected to a corresponding photovoltaic array. Alternating current output terminals of the at least two inverters are connected in parallel. The controller is configured to: obtain a direct current component of a common-mode output current of at least one of the at least two inverters and adjust a direct current bus voltage of the corresponding inverter based on a magnitude of the direct current component of the common-mode output current, to suppress a circulating current between the at least two inverters. A circulating current between a plurality of inverters connected in parallel can be suppressed, thereby reducing loss caused by a circulating current, and improving power supply efficiency.
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公开(公告)号：US20230170824A1
公开(公告)日：2023-06-01
申请号：US18154274
申请日：2023-01-13
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Yongbing GAO , Qinwei LIU , Niantao JIANG
Abstract: A common mode current controller of an inverter includes switches and an impedance correction circuit. One end of the impedance correction circuit is grounded, and the other end is connected to one end of each of the switches. The other end of each of the switches is connected to one of a positive terminal and a negative terminal of a direct current busbar capacitor. When a midpoint-to-ground voltage of the direct current busbar capacitor exceeds a threshold range, the switches are closed to adjust impedance matching between a positive terminal-to-ground equivalent impedance of the direct current busbar capacitor and a negative terminal-to-ground equivalent impedance of the direct current busbar capacitor.
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公开(公告)号：US20230086269A1
公开(公告)日：2023-03-23
申请号：US18071847
申请日：2022-11-30
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Dong CHEN , Yongbing GAO , Lei SHI , Xun WANG
Abstract: A fault protection apparatus includes a first diode, a first switch component, a control unit, a first port, a second port, a third port, a fourth port, and a fifth port. The first port is connected to a positive common direct current bus of the common direct current bus. The second port is connected to a negative common direct current bus of the common direct current bus. The third port is connected to a positive local bus of a branch on which the fault protection apparatus is located. The fourth port is connected to a negative local bus of the branch on which the fault protection apparatus is located. The first diode and the first switch component are connected to the power system through the first port, the second port, the third port, and the fourth port.
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20.发明申请公开(公告)号：US20220271712A1
公开(公告)日：2022-08-25
申请号：US17673140
申请日：2022-02-16
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Yongbing GAO , Yunyu TANG , Lei SHI
Abstract: A fault detection apparatus includes a temperature detection unit, a current detection unit, a controller, and a breaking unit. The temperature detection unit is configured to detect temperatures of the plurality of filter capacitors and output the temperatures to the controller. The current detection unit is coupled to the plurality of filter capacitors and is configured to detect currents of the plurality of filter capacitors and output the currents to the controller. The controller is separately connected to the temperature detection unit, the current detection unit, and the breaking unit, and is configured to: when the received temperature exceeds a first threshold and the received current exceeds a second threshold, control the breaking unit to be disconnected. The breaking unit is connected between the output end of the grid-tied inverter and the plurality of filter capacitors and is configured to be disconnected or connected under control of the controller.
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