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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：US20220285950A1
公开(公告)日：2022-09-08
申请号：US17687335
申请日：2022-03-04
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Hualei JU , Lin LI , Haibin GUO
IPC: H02J7/00
Abstract: An energy storage system includes a battery cluster, a battery control system, at least two first power conversion modules, a bus, and a second power conversion module. A plurality of battery packs in the battery cluster are connected in parallel to the bus through the at least two first power conversion modules, one end of the second power conversion module is connected in parallel to the battery cluster, and the other end of the second power conversion module is connected to a load or a power grid. The battery control system obtains a target current value that needs to be provided by the second power conversion module to the load or the power grid. In this application, the battery parameters of the battery packs can be equalized, or the battery cluster is enabled to output the target power, so that system stability is improved.
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公开(公告)号：US20230400524A1
公开(公告)日：2023-12-14
申请号：US18455920
申请日：2023-08-25
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Zhiwu XU , Jialong XU , Haibin GUO
IPC: G01R31/3842 , H02S50/10
CPC classification number: G01R31/3842 , H02S50/10
Abstract: A power supply system and an IV curve scanning method for a power supply system. The power supply system includes at least a first inverter and a second inverter. The first inverter starts, at an IV curve scanning start time of the first inverter, to perform IV curve scanning on a string connected to the first inverter, and the second inverter starts, at an IV curve scanning start time of the second inverter, to perform IV curve scanning on a string connected to the second inverter. Their IV curve scanning start time is different. In addition, a time interval between the IV curve scanning their start time is less than a preset IV curve scanning period. In the embodiments, fluctuation of an output power of the power supply system during IV curve scanning can be reduced, thereby improving system stability of the power supply system.
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公开(公告)号：US20240079881A1
公开(公告)日：2024-03-07
申请号：US18496045
申请日：2023-10-27
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Lin LI , Zhiwu XU , Haibin GUO
CPC classification number: H02J3/381 , H02J3/32 , H02J3/466 , H02J2300/26
Abstract: A power system includes N direct current coupling units, N direct current buses, and a main controller. The main controller is configured to: obtain a total network input demand power (a network input power required by the power grid); obtain first amplitude limiting values (indicate a maximum discharging power that can be supplied by each energy unit to the power grid); and determine first network input power values (a power value allocated to each energy unit and that is input to the power grid, and at least one direct current coupling unit is in a first amplitude limiting state) based on the total network input demand power and the first amplitude limiting values, and the first amplitude limiting state is that a first network input power value of direct current coupling unit is equal to a first amplitude limiting value corresponding to the direct current coupling unit.
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公开(公告)号：US20230402941A1
公开(公告)日：2023-12-14
申请号：US18454581
申请日：2023-08-23
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Xinyu YU , Kai XIN , Haibin GUO , Fuqiang XU
IPC: H02M7/5388 , H02M1/12 , H02M1/14 , H02M7/483
CPC classification number: H02M7/5388 , H02M1/12 , H02M1/14 , H02M7/483
Abstract: This application discloses a common-mode voltage adjustment method and apparatus, and a control system, and relates to the field of electronic technologies. In an example method, a controller generates an injection instruction of a first common-mode voltage based on a first modulation scheme, generates an injection instruction of a second common-mode voltage based on a second modulation scheme, and generates an injection instruction of a third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage during a modulation scheme switching period. The injection instruction of the third common-mode voltage may be used to control a inverter circuit to output the third common-mode voltage.
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Patent Agency Ranking
公开(公告)号：US20230366953A1
公开(公告)日：2023-11-16
申请号：US18356406
申请日：2023-07-21
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Zhiwu XU , Haibin GUO , Lin LI
Abstract: A detection method and a related apparatus. Whether a first converter and a second converter are connected to a same combiner device is determined by determining an output port voltage signal of the first converter and an output port voltage signal of the second converter, so that first information or second information is generated and notified to staff. Generally, if a first converter and a second converter in a combiner system are not connected to a same combiner device, it may be considered as that a wire connection of the first converter or the second converter is incorrect. In the detection method and the related apparatus, whether there is a wiring error in the combiner system of the converters can be quickly and accurately determined in an application scenario in which voltage information at a combiner point cannot be obtained.
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公开(公告)号：US20250070300A1
公开(公告)日：2025-02-27
申请号：US18811991
申请日：2024-08-22
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Qi WU , Yihong WU , Yuandong MENG , Haibin GUO , Ye He
IPC: H01M10/615 , H01M10/42 , H01M10/635 , H01M10/6571
Abstract: An energy storage apparatus and an energy storage system. The energy storage apparatus includes a cell and a heating circuit. The heating circuit includes a heating resistor and a switch. The heating resistor and the switch are configured to be connected in series to a power supply loop. The switch in the heating circuit is controlled to be on and off, so that the heating resistor is intermittently connected to and disconnected from the power supply loop. The switch may control, based on a power supply voltage provided by the power supply loop, turn-on time and turn-off time of a line between the power supply loop and the heating resistor in each switching cycle, to dynamically adjust an average heating power of the heating circuit.
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公开(公告)号：US20230052129A1
公开(公告)日：2023-02-16
申请号：US17886128
申请日：2022-08-11
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Lin LI , Haibin GUO , He ZHOU
IPC: H02J7/00
Abstract: An energy storage system includes N switch units and N battery packs connected in series. The N switch units are separately connected to two ends of the N battery packs in a one-to-one correspondence. Each of the N switch units is configured to: when the energy storage system is in a charging state and remaining power of a battery pack correspondingly connected to each switch unit meets a first preset condition, and/or when the energy storage system is in a discharging state and the remaining power of the battery pack correspondingly connected to each switch unit meets a second preset condition, perform disconnection processing on the battery pack correspondingly connected to each switch unit. The first preset condition includes being greater than or equal to a first preset power value. The second preset condition includes being less than or equal to a second preset power value.
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公开(公告)号：US20220320866A1
公开(公告)日：2022-10-06
申请号：US17707121
申请日：2022-03-29
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Hualei JU , Zhiwu XU , Haibin GUO
IPC: H02J3/32
Abstract: A power system includes a controller, configured to adjust an output current of a first converter to a first current value based on a voltage of a direct current bus and a voltage threshold, where a difference between an adjusted voltage of the direct current bus and the voltage threshold is less than a difference between the unadjusted voltage of the direct current bus and the voltage threshold. The controller adjusts the output current of the first converter to a second current value based on output power of the first converter and a power threshold, where a difference between adjusted output power of the first converter and the power threshold is less than a difference between the unadjusted output power of the first converter and the power threshold. The controller adjusts the output current of the first converter based on the first current value and the second current value.
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公开(公告)号：US20220311246A1
公开(公告)日：2022-09-29
申请号：US17704120
申请日：2022-03-25
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xiaoqian MENG , Haibin GUO , Yongbing GAO
Abstract: A photovoltaic system and a leakage current control method for the photovoltaic system includes at least one photovoltaic module group, at least one photovoltaic inverter, a grounded metal frame, and a sampling control unit. The photovoltaic module group is mounted on the grounded metal frame. An output end of the photovoltaic module group is connected to an input end of the photovoltaic inverter, and an output end of the photovoltaic inverter is connected to a power grid. The sampling control unit is coupled to both the photovoltaic module group and the photovoltaic inverter and is configured to detect a current value of a leakage current formed by a common-mode voltage of the photovoltaic inverter on a parasitic capacitor. Herein, the parasitic capacitor exists between the photovoltaic module group and the grounded metal frame.
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