公开(公告)号：US20240235252A9

公开(公告)日：2024-07-11

申请号：US18401455

申请日：2023-12-30

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Shijiang Yu ,  Zhipeng Wu ,  He Zhou ,  Lei Shi ,  Yang Hu

IPC: H02J9/06 ,  H02J3/00 ,  H02J3/32 ,  H02J7/35

CPC classification number: H02J9/068 ,  H02J3/0012 ,  H02J3/32 ,  H02J7/35 ,  H02J9/061 ,  H02J2207/20 ,  H02J2300/24

Abstract: This disclosure provides an energy storage apparatus, an energy storage apparatus control method, and a photovoltaic system. The energy storage apparatus includes: a plurality of battery clusters, a plurality of conversion units, a start unit, and a controller. The controller includes a plurality of control units. The start unit is configured to: after receiving a start signal, control a control switch in at least one battery cluster to close, to start a control unit corresponding to the battery cluster. The control unit is configured to: determine, based on a state of the control switch in the battery cluster, whether a black start mode is on; and when determining that the black start mode is on, control a DC-DC converter in the corresponding conversion unit to release electric energy stored in a battery pack in the corresponding battery cluster, to energize a direct current bus.

公开(公告)号：US20240014677A1

公开(公告)日：2024-01-11

申请号：US18471789

申请日：2023-09-21

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhipeng Wu ,  Yang Hu ,  He Zhou ,  Shijiang Yu

IPC: H02J7/00

CPC classification number: H02J7/0069 ,  H02J7/0013 ,  H02J7/0048 ,  H02J7/00712 ,  H02J2207/20

Abstract: A method for controlling an energy storage system includes: determining that a first battery cluster in a plurality of battery clusters needs to be calibrated; and controlling, based on a state of charge SOC of the first battery cluster and a current charging or discharging state of the energy storage system, the first battery cluster to be charged or discharged or to be in a standby state, so that the first battery cluster satisfies a SOC calibration condition. In the method, charging, discharging, or standby-state control needs to be performed on only one battery cluster that needs to be calibrated in the energy storage system, independent decoupling management is implemented on the battery cluster, and normal running of the energy storage system is not affected. This enables the battery cluster to quickly satisfy the SOC calibration condition and can improve SOC accuracy of the energy storage system.

公开(公告)号：US12136808B2

公开(公告)日：2024-11-05

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

IPC: H02H7/00 ,  H02H1/00 ,  H02H7/20 ,  H02J3/38

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.

公开(公告)号：US20240136850A1

公开(公告)日：2024-04-25

申请号：US18401455

申请日：2023-12-30

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Shijiang Yu ,  Zhipeng Wu ,  He Zhou ,  Lei Shi ,  Yang Hu

IPC: H02J9/06 ,  H02J3/00 ,  H02J3/32 ,  H02J7/35

CPC classification number: H02J9/068 ,  H02J3/0012 ,  H02J3/32 ,  H02J7/35 ,  H02J9/061 ,  H02J2207/20 ,  H02J2300/24

Abstract: This disclosure provides an energy storage apparatus, an energy storage apparatus control method, and a photovoltaic system. The energy storage apparatus includes: a plurality of battery clusters, a plurality of conversion units, a start unit, and a controller. The controller includes a plurality of control units. The start unit is configured to: after receiving a start signal, control a control switch in at least one battery cluster to close, to start a control unit corresponding to the battery cluster. The control unit is configured to: determine, based on a state of the control switch in the battery cluster, whether a black start mode is on; and when determining that the black start mode is on, control a DC-DC converter in the corresponding conversion unit to release electric energy stored in a battery pack in the corresponding battery cluster, to energize a direct current bus.

公开(公告)号：US11500001B2

公开(公告)日：2022-11-15

申请号：US17486506

申请日：2021-09-27

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Chen Wang ,  Xiaowei Xie ,  Yang Hu

IPC: G01R27/02 ,  G01R27/08 ,  G01R27/18 ,  G01R31/42 ,  G01R31/52 ,  H02J3/38 ,  H02M7/44 ,  H02S40/32

Abstract: An insulation resistance detection circuit and method are disclosed. The circuit includes a controller configured to: open a first relay, and close second relays, or switch an on/off status of at least one of the second relays; determine, based on a first measurement value between a positive input terminal of an inverter circuit and an earthing point, whether the positive input terminal of the inverter circuit is short-circuited or has low resistance to protective earthing; and determine, based on a second measurement value between a negative input terminal of the inverter circuit and the earthing point, whether the negative input terminal of the inverter circuit is short-circuited or has low resistance to protective earthing, where the first relay is one of in M relays and is connected to at least one impedor in parallel, and the second relays are relays other than the first relay in the M relays.