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

IPC: H02S50/10 ,  H02J3/46 ,  H02S40/34 ,  G01R27/18

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.

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

IPC: H02S50/00 ,  G01R31/14 ,  H02J1/10

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.

公开(公告)号：US20230231488A1

公开(公告)日：2023-07-20

申请号：US18186477

申请日：2023-03-20

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jianfei LIN ,  Jixin ZHU ,  Yu PENG

IPC: H02M7/00 ,  H05K5/02 ,  H02S40/32

CPC classification number: H02M7/003 ,  H05K5/0213 ,  H02S40/32

Abstract: An inverter, a photovoltaic power generation system, and a dehumidification method. The inverter includes a ventilation valve and a pneumatic transmission device. The ventilation valve is installed on a surface of a cabinet compartment of the inverter. A controller and the pneumatic transmission device are located in the cabinet compartment. A breathable film is disposed on the ventilation valve. The pneumatic transmission device blows air in the cabinet compartment toward the breathable film when the following at least one preset condition is met. The at least one preset condition includes at least one of or more of the following cases: the inverter is running, humidity in the cabinet compartment is higher than preset humidity, and a temperature in the cabinet compartment is higher than a preset temperature.