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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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公开(公告)号：US20220117123A1
公开(公告)日：2022-04-14
申请号：US17558917
申请日：2021-12-22
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Junjie LI , Xinyu YU , Kai XIN , Jiaguang FU
IPC: H05K7/20
Abstract: Embodiments of this application disclose a heat dissipating element control method, including: obtaining a status parameter set and a detected temperature of a first device, where the status parameter set is associated with a running temperature of the first device; determining values of a first temperature parameter and a second temperature parameter in a target adjustment function based on the status parameter set; and determining the heat dissipating efficiency of the heat dissipating element based on the values of the first temperature parameter and the second temperature parameter and the detected temperature, and controlling running of the heat dissipating element. This resolves a problem that the heat dissipating efficiency is not adjusted in time because the detected temperature is unable to reflect an actual temperature in real time.
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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：US20250023489A1
公开(公告)日：2025-01-16
申请号：US18770904
申请日：2024-07-12
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Peng DONG , Xinyu YU , Kai XIN , Yunfeng LIU
Abstract: A power converter includes a power conversion circuit, a bus capacitor, and a controller. A direct current input end of the power conversion circuit is configured to connect to a direct current power supply through a direct current bus. An alternating current output end of the power conversion circuit is configured to connect to an alternating current power grid through a point of common coupling (PCC). The controller is configured to: in response to that a difference between a voltage across two ends of the positive bus capacitor and a voltage across two ends of the negative bus capacitor is greater than a specified threshold, control the power converter to inject a second harmonic current into the alternating current power grid, to reduce the difference between the voltage across the two ends of the positive bus capacitor and the voltage across the two ends of the negative bus capacitor.
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Patent Agency Ranking
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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公开(公告)号：US20230421074A1
公开(公告)日：2023-12-28
申请号：US18463399
申请日：2023-09-08
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu YU , Xudong WANG , Kai XIN , Lei SHI
Abstract: A three-level neutral point clamped inverter includes four switch units. When an average value of an output current of the three-level neutral point clamped inverter is greater than a first current threshold or less than a second current threshold, only one of the four switch units is controlled to perform a high-frequency operation, to reduce power consumption caused by a high-frequency operation. The average value of the output current is an average value of the output current of the three-level neutral point clamped inverter in a switching cycle. The first current threshold is a positive number, and the second current threshold is a negative number. Power consumption caused by the high-frequency operation of the switch unit in the inverter may be reduced, and electric energy conversion efficiency of the inverter may be improved. A time period in which two switch units perform complementary operations at high frequency is very small.
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19.发明公开公开(公告)号：US20230318434A1
公开(公告)日：2023-10-05
申请号：US18329902
申请日：2023-06-06
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Fuqiang XU , Jun WANG , Xinyu YU , Kai XIN , Lei SHI
CPC classification number: H02M1/0058 , H02M3/1582 , H02J3/381 , H02J2300/26
Abstract: A conversion circuit, a conversion circuit precharge control method, and a photovoltaic system avoid additional costs and avoid impact on a switch caused by a current generated in a circuit at a moment when an RSCC enters an operating state, thereby ensuring operating performance of the RSCC. The conversion circuit includes a first power supply, a resonant switched capacitor converter (RSCC), and a control circuit. The RSCC includes a switch unit, an output filter unit, a first input end, a second input end, and an output end. The first power supply is configured to supply an input voltage to the RSCC. The control circuit is configured to: before controlling the RSCC to operate, control the switch unit in the RSCC to transmit, to the output filter unit, electric energy supplied by the first power supply.
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公开(公告)号：US20220115873A1
公开(公告)日：2022-04-14
申请号：US17556045
申请日：2021-12-20
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: A string inverter control method includes: in a process of performing IV curve scanning on one or more first direct current/direct current step-up circuits, controlling a change of an output voltage of one or more second direct current/direct current step-up circuits on which the IV curve scanning does not need to be performed, where a change trend of the output voltage and a change trend of an input voltage of the one or more first direct current/direct current step-up circuits on which the IV curve scanning is performed present a non-strictly monotonically increasing relationship. Therefore, for the direct current/direct current step-up circuit on which the IV curve scanning is performed, a voltage difference between two ends of the direct current/direct current step-up circuit is not always in a relatively high state, so that a ripple current on an input inductor in the direct current/direct current step-up circuit can be reduced.
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