公开(公告)号：US20240063654A1

公开(公告)日：2024-02-22

申请号：US18495084

申请日：2023-10-26

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Gang XIAO ,  Zhiqing WU ,  Rong WU ,  Lin ZHU ,  Shaohui ZHONG

IPC: H02J7/35 ,  H02J3/38

CPC classification number: H02J7/35 ,  H02J3/38 ,  H02J2300/24 ,  H02J2207/20

Abstract: This application describes examples of a photovoltaic energy storage system including an inverter and an energy storage device. In one example, an input end of the inverter is connected to a direct current bus. An output end of the inverter is connected to an alternating current power grid. The energy storage device is connected to the direct current bus. The inverter is configured to send high-voltage ride-through information to the energy storage device when a high-voltage ride-through occurs in the alternating current power grid. The energy storage device is configured to: when the high-voltage ride-through information is received, adjust an output voltage reference value to maintain a discharging working state if the energy storage device is in the discharging working state, or adjust a charging power reference value to maintain a charging working state if the energy storage device is in the charging working state.

公开(公告)号：US20220276296A1

公开(公告)日：2022-09-01

申请号：US17681386

申请日：2022-02-25

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Gang XIAO ,  Zhiqing WU ,  Shaohui ZHONG

IPC: G01R31/08 ,  G01R19/165

Abstract: A fault detection method for a three-phase power distribution system, which includes three phase lines and a neutral line. The three phase lines intersect with the neutral line at a neutral point, the three phase lines include a first phase line, a second phase line, and a third phase line, and at least one of the three phase lines is connected to the neutral line. The method includes: obtaining a voltage between every two phase lines; obtaining a voltage between each phase line and the neutral point based on the voltage between every two phase lines; obtaining a voltage between the neutral line and the neutral point based on a voltage between each phase line and the neutral line and the voltage between each phase line and the neutral point; and detecting the voltage between the neutral line and the neutral point, whether a fault occurs in the neutral line.