公开(公告)号：US11342757B2

公开(公告)日：2022-05-24

申请号：US17479820

申请日：2021-09-20

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Xinyu Yu ,  Kai Xin ,  Junjie Li

IPC: H02J3/38 ,  H02J3/00 ,  H02J3/01

Abstract: An islanding detection method and apparatus, and a computer-readable storage medium. The detection method includes: determining a harmonic amplitude growth rate and a frequency growth rate of alternating current electricity output by an alternating current port of a grid-tied inverter; determining an islanding disturbance coefficient corresponding to the harmonic amplitude growth rate, where the harmonic amplitude growth rate and the islanding disturbance coefficient are in a monotonically increasing relationship; determining an islanding injection amount based on the frequency growth rate and the islanding disturbance coefficient corresponding to the harmonic amplitude growth rate; controlling, based on the islanding injection amount, the grid-tied inverter to output a reactive power or a reactive current over the alternating current port; and performing islanding detection based on a frequency of the alternating current electricity output by the alternating current port. With this detection method, whether islanding occurs can be accurately detected. When islanding does not occur, disturbance to a power grid is reduced, and grid connection stability is improved. When islanding occurs, it can be quickly detected, and a detection time is relatively short.

公开(公告)号：US12224682B2

公开(公告)日：2025-02-11

申请号：US18154277

申请日：2023-01-13

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu Yu ,  Kai Xin ,  Peng Dong ,  Junjie Li

IPC: H02M7/538 ,  H02M1/12 ,  H02M7/5387 ,  H02M7/5395

Abstract: A common-mode voltage injection control method and apparatus for an inverter. For the method and apparatus, a common-mode voltage for a DPWM mode is calculated based on three-phase port voltages and an output power command; a common-mode voltage for an MPC modulation mode is calculated based on the direct current bus voltage, the three-phase port voltages, and the output power command; a modulation proportion is determined based on a maximum phase voltage peak value of the three-phase port voltages, the direct current bus voltage, and a power factor of the output power command; and a common-mode injection voltage is generated based on the common-mode voltage for the DPWM mode, the modulation proportion, and the common-mode voltage for the MPC modulation mode.

公开(公告)号：US11984800B2

公开(公告)日：2024-05-14

申请号：US17693221

申请日：2022-03-11

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu Yu ,  Kai Xin ,  Junjie Li

IPC: H02M1/32 ,  H02M7/44 ,  H02J3/38

CPC classification number: H02M1/32 ,  H02M7/44 ,  H02J3/381 ,  H02J2300/24

Abstract: A power supply system for controlling the power supply system includes a direct current voltage conversion apparatus, an inverter, and a diode. The direct current voltage conversion apparatus includes a controller and a direct current voltage conversion circuit. The controller is configured to: control the output voltage of the direct current voltage conversion circuit, so that the diode is in a conducted state; detect a voltage on the direct current bus; and determine, based on the voltage on the direct current bus, whether high voltage ride-through occurs in the power supply system. According to the power supply system and the method for controlling the power supply system provided in this application, high voltage ride-through can be quickly detected while fault isolation is implemented, thereby improving efficiency of detecting high voltage ride-through.