公开(公告)号：US20230378765A1

公开(公告)日：2023-11-23

申请号：US18316395

申请日：2023-05-12

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fangcheng LIU ,  Xiongfei WANG ,  Teng LIU

IPC: H02J3/38

CPC classification number: H02J3/388 ,  H02J3/381 ,  H02J2300/24

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.