公开(公告)号：US20220329082A1

公开(公告)日：2022-10-13

申请号：US17719130

申请日：2022-04-12

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jianshan LI ,  He ZHOU ,  Shijiang YU ,  Zhipeng WU

IPC: H02J7/00

Abstract: An energy storage system and a method for controlling an the energy storage system, includes a plurality of energy storage units. The energy storage unit includes a plurality of battery cells, a plurality of balancing units, a voltage conversion unit, a first switch, a second switch, and a control unit. The control unit is configured to detect fault cases of the plurality of battery cells, and control open and closed states of the first switch and the second switch. According to the application, it can be ensured that each energy storage unit in the energy storage system can continuously work when a battery cell is faulty and when state of charge balance between battery cells is implemented, thereby greatly improving reliability of the energy storage system with low costs.

公开(公告)号：US20220320873A1

公开(公告)日：2022-10-06

申请号：US17708506

申请日：2022-03-30

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jianshan LI ,  Yanzhong ZHANG ,  He ZHOU ,  Zhipeng WU

IPC: H02J7/00

Abstract: An energy storage system, to improve operating efficiency and system reliability that exist when a component in the energy storage system is faulty, and avoid a waste of resources. The energy storage system includes a plurality of energy storage branches, at least one switch unit, and a control circuit. Each of the energy storage branches includes a first bus, a string-level converter, and a battery string that are sequentially connected in series, a plurality of balancing converters, and a shared bus. The battery string includes a plurality of battery units connected in series, and each of the battery units includes one battery pack. The battery pack is connected to an input side of one corresponding balancing converter, and output sides of the plurality of balancing converters are separately connected to the shared bus.

公开(公告)号：US20220326294A1

公开(公告)日：2022-10-13

申请号：US17707436

申请日：2022-03-29

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhong WANG ,  Shengjie ZHANG ,  Jianshan LI ,  YU PENG ,  Shijiang YU ,  He ZHOU ,  Bo YU

IPC: G01R31/14 ,  H02J3/38 ,  G01R31/52

Abstract: A photovoltaic energy system and a method for detecting a ground insulation impedance, improve accuracy of detecting a ground insulation impedance after one or more conversion circuits are connected in parallel. The photovoltaic energy system includes one or more conversion circuits and a detection circuit. The detection circuit includes an alternating current signal source and a sampling resistor that are connected in series, a first sampling circuit, and a control circuit. The control circuit is configured to control the alternating current signal source to output harmonic signals of a first frequency and a second frequency. The first sampling circuit is configured to: when the alternating current signal source outputs the harmonic signal of the first frequency, collect a voltage at both terminals of the sampling resistor to obtain a first voltage.