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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
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.
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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.
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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
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.
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4.发明申请公开(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
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.
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公开(公告)号：US12160106B2
公开(公告)日：2024-12-03
申请号：US17964121
申请日：2022-10-12
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu Yu , Yuan Yao , Fuqiang Xu , Kai Xin
Abstract: A power supply system, a converter, and a circulating current suppression method of the converter. The power supply system includes at least two converters that are coupled between a direct current power supply and an alternating current grid. Each converter obtains target output reactive power when an output current of the converter starts to increase from an initial current, obtains a reactive power compensation parameter based on the three-phase output voltages. Further, each converter obtains compensated output reactive power of the converter based on the reactive power compensation parameter and adjusts actual output reactive power of the converter based on the target output reactive power and the compensated output reactive power, so that an absolute value of a difference between common-mode output voltages of any two of the at least two adjusted converters is less than a difference threshold.
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Patent Agency Ranking
公开(公告)号：US20240030713A1
公开(公告)日：2024-01-25
申请号：US18476577
申请日：2023-09-28
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Mingxuan Dong , Kai Xin
CPC classification number: H02J3/32 , H02J3/38 , H02J7/0048 , H02J2300/28 , H02J2300/24
Abstract: A method includes: performing one or more adjustments on a filter parameter based on battery information of the ESS that is at a first control moment, and performing one or more times of power filtering by the filter, until a power fluctuation rate determined based on a power obtained through filtering is less than or equal to a preset threshold; and determining, based on the power obtained through filtering, a given power of the ESS that is at the first control moment. During smooth control of a power, a relationship is established between battery information and a filter characteristic, so as to prevent a battery from quickly reaching a fully charged state or a fully discharged state.
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公开(公告)号：US20230421098A1
公开(公告)日：2023-12-28
申请号：US18454211
申请日：2023-08-23
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu Yu , Jianqiang Wang , Song Wan , Kai Xin
CPC classification number: H02S50/15 , H02J2300/26 , H02J3/381
Abstract: A photovoltaic cell detection method includes determining a first output power working at a first voltage and a second output power working at a second voltage, where a difference between the first output power and the second output power is less than a power difference threshold, and where both the first output power and the second output power are greater than 0; controlling the photovoltaic cell to work at the first voltage, and obtaining first infrared image information of the photovoltaic cell; and controlling the photovoltaic cell to work at the second voltage, and obtaining second infrared image information of the photovoltaic cell, where both the first infrared image information and the second infrared image information are used to jointly detect whether the photovoltaic cell is faulty.
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公开(公告)号：US20250158534A1
公开(公告)日：2025-05-15
申请号：US18945929
申请日：2024-11-13
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Zisen Qu , Mingquan Zhao , Meiqing Zhang , Kai Xin , Yunfeng Liu
Abstract: A power conversion system which includes N power conversion units and a control unit. The control unit selects a target power conversion unit and a coordinated power conversion unit in a control periodicity, controls an operating mode of the target power conversion unit to be sequentially switched between a PR mode and a MPPT mode, and updates a reference power based on a maximum power obtained in the MPPT mode, for an operating power of the target power conversion unit in the PR mode to be an updated reference power, and the updated reference power is less than or equal to the maximum power. In addition, the control unit controls an operating power of the coordinated power conversion unit to be coordinately adjusted, for a total variation of operating powers of the N power conversion units to be less than a variation threshold.
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公开(公告)号：US12230966B2
公开(公告)日：2025-02-18
申请号：US18476577
申请日：2023-09-28
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Mingxuan Dong , Kai Xin
Abstract: A method includes: performing one or more adjustments on a filter parameter based on battery information of the ESS that is at a first control moment, and performing one or more times of power filtering by the filter, until a power fluctuation rate determined based on a power obtained through filtering is less than or equal to a preset threshold; and determining, based on the power obtained through filtering, a given power of the ESS that is at the first control moment. During smooth control of a power, a relationship is established between battery information and a filter characteristic, so as to prevent a battery from quickly reaching a fully charged state or a fully discharged state.
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公开(公告)号：US20240305096A1
公开(公告)日：2024-09-12
申请号：US18667399
申请日：2024-05-17
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Meiqing Zhang , Shuo Wang , Mingxuan Dong , Kai Xin
IPC: H02J3/00
CPC classification number: H02J3/0012
Abstract: An output end of a power converter is connected to a microgrid bus, and the microgrid bus is connected to an external power grid through a grid-tied switch. When detecting that a power grid fails, the power converter is in a first current source control mode. After a duration of the power grid failure reaches a first duration, the power converter switches from the first current source control mode to a first voltage source control mode. The first current source control mode is a current source failure ride-through control mode. The first voltage source control mode is a voltage source failure ride-through control mode. The first duration is less than a second duration, and the second duration is a time interval between a moment at which the power grid fails and a moment at which the grid-tied switch is turned off.
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