公开(公告)号：US20230420956A1

公开(公告)日：2023-12-28

申请号：US18464909

申请日：2023-09-11

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhipeng Wu ,  Lin Li ,  He Zhou ,  Yanzhong Zhang ,  Jie Kong

IPC: H02J7/00 ,  H02J3/32 ,  H02J3/38

CPC classification number: H02J7/0016 ,  H02J7/0019 ,  H02J3/32 ,  H02J3/38 ,  H02J7/00712 ,  H02J2207/20 ,  H02J2300/24

Abstract: An energy storage system includes a battery cluster, a direct current converter, a controller, and at least one power conversion system. The energy storage system includes at least one direct current branch. The direct current branch includes a battery cluster and a direct current converter that are connected to each other. The direct current converter performs direct current conversion on a direct current provided by the battery cluster. Each battery cluster includes at least two energy storage modules that are connected in series. The controller controls the first equalization circuit, to balance electricity quantities of battery modules in the battery cluster, and allocates operating power to the power conversion system and the direct current converter. In this solution, impact of bucket effect on the energy storage system is reduced, so that a battery capacity can be more fully utilized.

公开(公告)号：US11848623B2

公开(公告)日：2023-12-19

申请号：US17669111

申请日：2022-02-10

Applicant: Huawei Digital Power Technologies Co., Ltd

Inventor： Lin Li ,  Zhiwu Xu ,  Haibin Guo

IPC: H02M7/5387 ,  H02M1/00 ,  H02J3/38

CPC classification number: H02M7/53871 ,  H02J3/381 ,  H02M1/0009 ,  H02J2300/24 ,  H02J2300/28

Abstract: A voltage source inverter includes a bus capacitor, a bidirectional power tube, a filter inductor, and a filter capacitor. A voltage control method includes: respectively obtaining a first feedback current and a first feedback voltage from an output end of the filter inductor and an output end of the filter capacitor; obtaining a first duty cycle and a second duty cycle based on the first feedback current, a maximum current reference value, and a minimum current reference value in a current loop; obtaining a third duty cycle based on the first feedback voltage and a voltage reference value in a voltage loop; and selecting one of the first duty cycle, the second duty cycle, and the third duty cycle, and controlling the bidirectional power tube, so that a duty cycle of the bidirectional power tube is between the first duty cycle and the second duty cycle.