公开(公告)号：US20250105625A1

公开(公告)日：2025-03-27

申请号：US18887314

申请日：2024-09-17

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xiongfei WANG ,  Teng Liu ,  Mingquan Zhao ,  Meiqing Zhang ,  Kai Xin ,  Yunfeng Liu

IPC: H02J3/18 ,  H02J3/32 ,  H02M1/00

Abstract: A power converter and a method. When the voltage at the grid connection point exceeds the preset voltage range and an amplitude of a voltage output by the power conversion circuit is not greater than a voltage threshold, embodiments can control the amplitude of the current output by the power conversion circuit to be not greater than a second current threshold, where the second current threshold is greater than the first current threshold, and a ratio of an active current to a reactive current output by the power conversion circuit is constant or changes; or, when the amplitude of the voltage output by the power conversion circuit is greater than the voltage threshold, embodiments can control the amplitude of the current output by the power conversion circuit to be equal to the second current threshold, where the ratio of the active current to the reactive current changes.

公开(公告)号：US12255464B2

公开(公告)日：2025-03-18

申请号：US18316395

申请日：2023-05-12

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xiongfei Wang ,  Fangcheng Liu ,  Teng Liu

IPC: H02J3/38 ,  G01R19/25

Abstract: An islanding detection method includes: an alternating current frequency of an inverter is monitored. The alternating current frequency fluctuates within a preset range when in a normal mode. When an instantaneous shifting value of the alternating current frequency exceeds the preset range, a frequency detected before instantaneous shifting is a first frequency. When a frequency in first frequency data within a first preset time period is greater than or less than only the first frequency, an alternating current frequency detected when the first preset time period ends is a second frequency. Output power of the inverter is continuously adjusted based on a change in the current alternating current frequency. When a frequency in second frequency data within a second preset time period is greater than or less than only the second frequency, it may be indicated in time that islanding occurs in the inverter, and an islanding status is reported.