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公开(公告)号：US20240250534A1
公开(公告)日：2024-07-25
申请号：US18625478
申请日：2024-04-03
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Fei XU , Xinyu YU , Kai XIN , Shuchao WANG
Abstract: A power supply system and a grid connection control method. The power supply system includes a power supply, an inverter, a transformer, a power station collection module, and an inverter collection control circuit. The inverter collection control circuit is configured to obtain an amplitude value and a frequency of an output voltage of the inverter, obtain an inverter power adjustment signal based on the amplitude value and the frequency of the output voltage, and control, based on the power station power adjustment signal and the inverter power adjustment signal, the inverter to output a target output power. Additionally, an output power of the inverter may be adjusted by using the power station collection module and the inverter collection control circuit. A structure is simple, and a control method is simple. This improves control precision and adjustment efficiency, reduces control time, and reduces control costs.
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公开(公告)号：US20240178668A1
公开(公告)日：2024-05-30
申请号：US18522758
申请日：2023-11-29
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Fei XU , Xinyu YU , Mingquan ZHAO , Zisen QU , Kai XIN
Abstract: An inverter and a control method for the inverter. The inverter includes a direct current conversion circuit, a direct current bus, an inverter circuit, and a controller. An input end of the direct current conversion circuit is connected to an input end of the inverter, an output end of the direct current conversion circuit is connected to an input end of the inverter circuit through the direct current bus, and an output end of the inverter circuit is connected to an output end of the inverter. The controller obtains a reactive voltage control amount based on actual output active power and reference output active power of the inverter circuit and adjusts an output voltage of the inverter circuit based on the reactive voltage control amount and a reference output voltage.
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Patent Agency Ranking
公开(公告)号：US20220109400A1
公开(公告)日：2022-04-07
申请号：US17553385
申请日：2021-12-16
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Fei XU , Xinyu YU , Kai XIN , Jianqiang WANG
Abstract: This application provides a converter and a power backfeed control method that are applied to a photovoltaic power generation system. One end of the converter is connected to at least one photovoltaic string, and another end of the converter is connected to a power grid. Each photovoltaic string corresponds to one string number. The power backfeed control method includes: controlling, according to a backfeed instruction, the converter to enter a backfeed mode, where in the backfeed mode, the converter can transmit energy of the power grid to a selected photovoltaic string with a corresponding number; determining a backfeed control voltage according to the backfeed instruction, and determining a voltage limit in a process of determining the backfeed control voltage; determining an actual backfeed voltage based on the backfeed control voltage and the voltage limit, where the actual backfeed voltage is a smaller one of the backfeed control voltage and the voltage limit; and controlling the converter to output the actual backfeed voltage to the selected photovoltaic string, to enable the selected photovoltaic string to generate an electroluminescent effect. This application can improve detection efficiency of the photovoltaic string, and reduce a power loss of the photovoltaic power generation system.
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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：US20230216426A1
公开(公告)日：2023-07-06
申请号：US18180258
申请日：2023-03-08
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: A three-level inverter includes controllable switch components T1 to T6. Each of the controllable switch components includes a parallel connected junction capacitor and an anti-parallel connected diode. A first terminal of T1 is connected to a positive direct current bus, a second terminal of T4 is connected to a negative direct current bus, a second terminal of T1 is connected to first terminals of T2 and T5. A controller is configured to: in a positive half cycle, control T3 to be conducted after T1 is conducted, and control T3 to be disconnected before T1 is conducted next time; and in a negative half cycle, control T2 to be conducted after T4 is conducted, and control T2 to be disconnected before T4 is conducted next time. The three-level inverter can balance voltages of the controllable switch components.
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公开(公告)号：US20230095057A1
公开(公告)日：2023-03-30
申请号：US18074172
申请日：2022-12-02
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Fei XU , Yongbing GAO , Guoping FAN
Abstract: This application provides a photovoltaic power generation system. The system includes at least one first photovoltaic module, a photovoltaic inverter, a first two-way DC/DC converter, and at least one first energy storage unit, and further includes at least one second photovoltaic module or at least one second energy storage unit. The photovoltaic inverter includes a DC/DC converter and a DC-AC inverter, where the DC/DC converter is electrically connected to the at least one first photovoltaic module, and the DC/DC converter is connected to the DC-AC inverter through a direct current bus. For the photovoltaic power generation system, photovoltaic arrays and energy storage devices can be configured flexibly to cope with peaks and troughs of power consumption.
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公开(公告)号：US20220255458A1
公开(公告)日：2022-08-11
申请号：US17729340
申请日：2022-04-26
Applicant: Huawei Digital Power Technologies Co., Ltd.
IPC: H02M7/487 , G01R19/175 , H02M1/38 , H02M7/5387
Abstract: Embodiments of the present application disclose a multi-level inverter clamping modulation method and apparatus, and an inverter. Switching elements of an inverter are controlled when an output voltage of the inverter crosses zero, and switching elements in each inverter bridge arm of an active clamp multi-level inverter include an internal tube, an external tube, and a clamping tube. The internal tube and the external tube are connected in series between a positive bus and a negative bus, the clamping tube is connected between a common terminal of the internal tube and the external tube and a bus, the internal tube is a low-frequency switching element, and the external tube and the clamping tube are high-frequency switching elements.
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