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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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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：US20230378908A1
公开(公告)日：2023-11-23
申请号：US18364669
申请日：2023-08-03
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Jianfei LIN , Yongbing GAO , Tiansan LIN
CPC classification number: H02S50/10 , H02J3/46 , H02S40/34 , G01R27/18 , H02J2300/26
Abstract: An impedance detection method and a photovoltaic system are provided to help reduce complexity and costs of impedance detection. The method includes: sampling a voltage between a direct current bus and a protective earthing at each of a first time point and a second time point, to obtain a first voltage value and a second voltage value; sampling a leakage current on the direct current bus at each of the first time point and the second time point, to obtain a first current value and a second current value; and calculating an insulation impedance value of a combiner box based on a difference between the first voltage value and the second voltage value and a difference between the first current value and the second current value, to determine whether impedance of the combiner box is abnormal.
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Patent Agency Ranking
公开(公告)号：US20230308050A1
公开(公告)日：2023-09-28
申请号：US18328902
申请日：2023-06-05
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Ting YU , Tiansan LIN , Jieling TANG
Abstract: The photovoltaic system includes a first inverter circuit, a second inverter circuit, and a switch circuit. When the switch circuit is in the first state, a first photovoltaic array is connected to the direct current positive bus and the neutral bus through the switch circuit, and a second photovoltaic array is connected to the neutral bus and the direct current negative bus through the switch circuit. When the switch circuit is in the second state, the first photovoltaic array is connected to the neutral bus and the direct current negative bus through the switch circuit, and the second photovoltaic array is connected to the direct current positive bus and the neutral bus through the switch circuit. A potential of the photovoltaic array is changed to prevent a PID effect from occurring when the photovoltaic array is at a negative potential for a long time.
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公开(公告)号：US20220216690A1
公开(公告)日：2022-07-07
申请号：US17701940
申请日：2022-03-23
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Yongbing GAO , Chen WANG , Tiansan LIN , Yang HU
Abstract: A photovoltaic power generation system includes an inverter, a controller, and at least two direct current branch circuits. The leakage current detection apparatus is configured to: detect a leakage current of the direct current branch circuit on which the leakage current detection apparatus is located and send the leakage current to the controller. The controller is further configured to: when the photovoltaic power generation system runs and a value of a leakage current of the direct current branch circuit exceeds a preset range, determine that an insulation fault occurs on the direct current branch circuit. The system can determine the direct current branch circuit on which the insulation fault occurs in the photovoltaic power generation system, so that measures are taken in time for the direct current branch circuit on which the insulation fault occurs, to eliminate a potential safety hazard.
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公开(公告)号：US20230344239A1
公开(公告)日：2023-10-26
申请号：US18345556
申请日：2023-06-30
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Yanzhong ZHANG , Hongmiao FANG , Bo YU , Jinxiang ZHAN , Tiansan LIN
IPC: H02J3/38 , H02M1/36 , H02M7/5387
CPC classification number: H02J3/381 , H02M1/36 , H02M7/53871 , H02J2300/24
Abstract: A first input end of a first inverter is connected to a second end of a direct current positive bus, and a second input end of the first inverter is connected to a second end of a neutral bus. A first input end of a second inverter is connected to the second end of the neutral bus, and a second input end of the second inverter is connected to a second end of a direct current negative bus. A controller is configured to control, in startup and shutdown processes, a voltage to ground of the direct current positive bus, a voltage to ground of the direct current negative bus, and a voltage to ground of the neutral bus each to be less than or equal to a preset voltage threshold, to ensure personal safety and device safety.
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公开(公告)号：US20220166313A1
公开(公告)日：2022-05-26
申请号：US17670592
申请日：2022-02-14
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Jun WANG , Houjian XU , Tiansan LIN , Fangpo ZHANG
Abstract: A direct current-direct current conversion circuit includes: an input inductor, a first capacitor, a second capacitor, a flying capacitor, a first switch, a second switch, a first inductor, a first diode, a first buffer circuit, a third switch, a fourth switch, a second inductor, a second diode, and a second buffer circuit. A power supply, the input inductor, the first diode, the second diode, the first capacitor, and the second capacitor are sequentially connected in series. A first terminal of the flying capacitor is connected between the first diode and the second diode. A second terminal of the flying capacitor is connected between the first switch and the third switch, and the second terminal of the flying capacitor is further connected between the second switch and the second inductor.
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公开(公告)号：US20220060146A1
公开(公告)日：2022-02-24
申请号：US17519291
申请日：2021-11-04
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Tiansan LIN , Peng JU
Abstract: Embodiments of this application disclose a design of an inverter and a design of a combiner box, to reduce maintenance costs of a photovoltaic device. According to the inverter or the combiner box provided in the embodiments of this application, when electroluminescence (EL) defect detection is performed on the photovoltaic device, a reverse charging circuit integrated into the inverter or integrated into the combiner box is used to output a direct current to a to-be-tested photovoltaic string of the photovoltaic device. Whether the to-be-tested photovoltaic string has defects is determined based on a light emission status of the to-be-tested photovoltaic string. By using the foregoing designs, maintenance engineers do not need to modify wiring terminals of the photovoltaic device when performing EL defect tests on the photovoltaic device. This helps reduce maintenance costs of the photovoltaic device.
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