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公开(公告)号：US20230336119A1
公开(公告)日：2023-10-19
申请号：US18338770
申请日：2023-06-21
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Xinyu YU , Kai XIN , Peng DONG , Yongbing GAO , Yanzhong ZHANG
CPC classification number: H02S40/32 , H02J3/381 , H02S40/34 , H02J2300/26
Abstract: An example system includes an inverter and at least one combiner box. The combiner box includes a plurality of direct current-direct current (DC-DC) circuits and one controller. The controller is configured to: when an output voltage of the combiner box is greater than or equal to a first preset voltage and less than or equal to a second preset voltage, control the combiner box to output a maximum power. When the output voltage of the combiner box is greater than the second preset voltage, the controller controls an output power of the combiner box to decrease as the output voltage increases. The second preset voltage is greater than the first preset voltage, and the maximum power is a sum of maximum powers of all photovoltaic strings connected to the combiner box.
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公开(公告)号：US20230238896A1
公开(公告)日：2023-07-27
申请号：US18179098
申请日：2023-03-06
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
IPC: H02M7/487 , H02M7/5387 , H02M1/12
CPC classification number: H02M7/487 , H02M7/53871 , H02M1/12 , H02J2300/24
Abstract: Example three-level inverters, control methods, and systems are provided. One example three-level inverter includes a first bus capacitor, a second bus capacitor, a power conversion circuit, and a controller. The first bus capacitor is connected in the middle of the current bus and the power conversion circuit. The power conversion circuit is configured to convert a direct current into a three-phase alternating current for output. The controller is configured to determine a balance reference by using a difference between absolute values of voltages of the positive and negative direct current buses and an even harmonic current in a grid-connected current, where the balance reference is used to enable the three-level inverter to generate a current signal for balancing the voltages of the positive and negative direct current buses.
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公开(公告)号：US20230208313A1
公开(公告)日：2023-06-29
申请号：US18147168
申请日：2022-12-28
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Congyuan WANG , Kai XIN , Zhangping SHAO
CPC classification number: H02M7/483 , H02M1/0009 , H02M1/0845 , H02M1/0019
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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公开(公告)号：US20230147775A1
公开(公告)日：2023-05-11
申请号：US18154277
申请日：2023-01-13
Applicant: Huawei Digital Power Technologies Co., Ltd.
IPC: H02M7/5387 , H02M7/5395 , H02M1/12
CPC classification number: H02M7/53873 , H02M7/5395 , H02M1/123
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.
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公开(公告)号：US20230031139A1
公开(公告)日：2023-02-02
申请号：US17875923
申请日：2022-07-28
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Mingxuan DONG , Yunfeng LIU , Kai XIN
Abstract: An energy storage system includes at least two power conversion systems PCSs, output terminals of the at least two PCSs are connected in parallel to connect to an alternating current power grid, and input terminals of the at least two PCSs are connected to an energy storage power supply. The first PCS is any one of the at least two PCSs. The voltage detection circuit detects a power grid voltage at a parallel connection point of the output terminals of the at least two PCSs. When determining, based on the power grid voltage at the parallel connection point, that islanding occurs in the alternating current power grid, the controller adjusts an angle of an output voltage of the first PCS to a reference angle, so that angles of output voltages of the at least two PCSs are the same.
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Patent Agency Ranking
16.发明申请公开(公告)号：US20250062619A1
公开(公告)日：2025-02-20
申请号：US18796732
申请日：2024-08-07
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Meiqing ZHANG , Mingxuan DONG , Ce FANG , Kai XIN
Abstract: The embodiments include a power converter including a DC/AC conversion unit. A direct current bus is connected to the DC/AC conversion unit and a direct current source. The DC/AC conversion unit is further connected to a power grid. When a direct current bus voltage is less than or equal to a first voltage threshold, the power converter may switch to a current source mode to output first output power to the power grid, where the first output power is equal to an output power limit of the direct current source. Then, if a fluctuation amplitude of the direct current bus voltage is less than or equal to a first fluctuation threshold, the power converter may resume outputting second output power to the power grid in a voltage source mode, so that the second output power is less than or equal to the output power limit of the direct current source.
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公开(公告)号：US20240333172A1
公开(公告)日：2024-10-03
申请号：US18658932
申请日：2024-05-08
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Yi DU , Xinyu YU , Kai XIN , Yunfeng LIU
CPC classification number: H02M7/48 , H02J3/16 , H02J3/381 , H02J2300/24
Abstract: Examples of power conversion devices and control methods are described. In one example, a power conversion device includes direct current buses, an inverter circuit, and a controller. After the power conversion device switches from a high voltage ride through state to a low voltage ride through state, the controller controls a change rate of an output active current of the inverter circuit to be a first change rate in a first time interval and a second change rate in a second time interval respectively in a low voltage ride through reactive current response process. The second change rate is greater than the first change rate. A sum of first interval duration of the first time interval and second interval duration of the second time interval is less than or equal to a low voltage ride through reactive current response duration threshold.
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公开(公告)号：US20240204654A1
公开(公告)日：2024-06-20
申请号：US18589857
申请日：2024-02-28
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Mingquan ZHAO , Kai XIN , Peng DONG
CPC classification number: H02M1/322 , H02J3/16 , H02M1/0009 , H02M1/0043 , H02M1/44 , H02M7/44
Abstract: A power converter control method includes: determining a phase angle difference between a phase angle of a voltage output by the power converter and a phase angle of a power grid voltage; and if the phase angle difference is greater than or equal to a first angle threshold, setting a d-axis current reference value and a q-axis current reference value that are used to determine a modulation voltage of the power converter to preset fixed values; calculating a first modulation voltage of the power converter based on the d-axis current reference value, the q-axis current reference value, and a power grid current; calculating a compensation voltage of the power converter based on a preset virtual resistance parameter and the power grid current; and using a sum of the first modulation voltage and the compensation voltage as a total modulation voltage.
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公开(公告)号：US20230308009A1
公开(公告)日：2023-09-28
申请号：US18328140
申请日：2023-06-02
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu YU , Kai XIN , Yanzhong ZHANG , Yongbing GAO
CPC classification number: H02M1/32 , H02M7/493 , H02J2300/24 , H02J3/381
Abstract: A photovoltaic system and a circulating current suppression method. The system includes a controller and at least two inverters. A direct current input terminal of each inverter is connected to a corresponding photovoltaic array. Alternating current output terminals of the at least two inverters are connected in parallel. The controller is configured to: obtain a direct current component of a common-mode output current of at least one of the at least two inverters and adjust a direct current bus voltage of the corresponding inverter based on a magnitude of the direct current component of the common-mode output current, to suppress a circulating current between the at least two inverters. A circulating current between a plurality of inverters connected in parallel can be suppressed, thereby reducing loss caused by a circulating current, and improving power supply efficiency.
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公开(公告)号：US20220294336A1
公开(公告)日：2022-09-15
申请号：US17693221
申请日：2022-03-11
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: A power supply system and a method 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.
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