公开(公告)号：US20240136815A1

公开(公告)日：2024-04-25

申请号：US18395643

申请日：2023-12-25

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhangping Shao ,  Kai Xin ,  Congyuan Wang

IPC: H02J3/00 ,  H02J3/01 ,  H02J3/16 ,  H02J3/24

CPC classification number: H02J3/00125 ,  H02J3/0012 ,  H02J3/01 ,  H02J3/16 ,  H02J3/24 ,  H02J2300/24

Abstract: This application provides a power supply system and a conversion method. The power supply system includes a power generation apparatus, a converter circuit, and a drive control circuit. The drive control circuit may be configured to: when a power grid fails, control, based on duration of previous low voltage ride-through, the converter circuit to increase a value of a current to be output to the power grid from a first operating current value to a low voltage ride-through current value, to increase a voltage value at an output end of the converter circuit. Herein, the previous low voltage ride-through is latest low voltage ride-through. In this application, the system can control, based on duration of previous voltage ride-through, a current to be output by the converter circuit to the power grid, to reduce circuit oscillation, with a simple structure, a simple control method, and high safety.

公开(公告)号：US20230178989A1

公开(公告)日：2023-06-08

申请号：US18151987

申请日：2023-01-09

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhangping Shao ,  Kai Xin ,  Haibin Guo

IPC: H02J3/18 ,  H02M7/66 ,  H02J3/00 ,  G05B19/042

CPC classification number: H02J3/18 ,  G05B19/042 ,  H02J3/001 ,  H02M7/66 ,  G05B2219/2639

Abstract: A current control method and system for a voltage asymmetry fault is disclosed. When a voltage asymmetry fault occurs, a first current limit value is obtained based on a post-fault positive-sequence voltage and a pre-fault positive-sequence reactive current, and a second current limit value is obtained based on a post-fault negative-sequence voltage and a pre-fault negative-sequence voltage. A third current limit value and a fourth current limit value are obtained based on the first current limit value and the second current limit value. A magnitude of a positive-sequence reactive current is limited by using the third current limit value, and a magnitude of a negative-sequence reactive current is limited by using the fourth current limit value.

公开(公告)号：US12231058B2

公开(公告)日：2025-02-18

申请号：US18147168

申请日：2022-12-28

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Congyuan Wang ,  Kai Xin ,  Zhangping Shao

IPC: H02M7/48 ,  H02M1/00 ,  H02M1/084 ,  H02M7/483

Abstract: A power conversion apparatus and a control method for a power conversion apparatus to reduce an amplitude of an output voltage of a converter when a grid is recovered from a fault, to ensure device safety. The power conversion apparatus includes a controller and a converter, and the controller is connected to the converter. The controller is configured to: after the output voltage of the converter is less than a first threshold, when the output voltage of the converter rises to be greater than a second threshold, reduce an active current output by the converter to a first current value, and reduce a reactive current output by the converter to a second current value, where the second threshold is greater than the first threshold.

公开(公告)号：US20250023490A1

公开(公告)日：2025-01-16

申请号：US18893048

申请日：2024-09-23

Applicant: Huawei Digital Power Technologies co., Ltd.

Inventor： Qilei CHEN ,  Zhangping Shao ,  Xinyu Yu ,  Kai Xin

IPC: H02M7/539 ,  H02J3/38 ,  H02M1/32

Abstract: A power supply system, a three-phase inverter, and a controller and a control method for a three-phase inverter. In the power supply system, after a low-voltage failure occurs in a power grid, a three-phase inverter outputs a first positive-sequence reactive current to the power grid through low voltage ride-through. When a voltage of at least one of three alternating currents output by the three-phase inverter is greater than a preset threshold, the three-phase inverter outputs a small second positive-sequence reactive current to the power grid through the three alternating currents, to reduce a voltage at an output end of the three-phase inverter and improve stability of the entire power supply system.