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公开(公告)号：US20240106244A1
公开(公告)日：2024-03-28
申请号：US18526340
申请日：2023-12-01
Applicant: Huawei Digital Power Technologies Co., Ltd.
CPC classification number: H02J3/40 , H02J3/381 , H02M7/493 , H02J2300/24
Abstract: This application discloses a photovoltaic system and a carrier wave signal synchronization method. The photovoltaic system includes a plurality of inverters and a controller. Each inverter in the photovoltaic system inverts a direct current into an alternating current based on a received carrier wave signal, and transmits the alternating current to a power grid. The controller obtains first output currents of the plurality of inverters in an adjustment period, so that the controller can obtain first output current valid values of the plurality of inverters based on the first output currents of the plurality of inverters.
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公开(公告)号：US11855460B2
公开(公告)日：2023-12-26
申请号：US17503016
申请日：2021-10-15
Applicant: Huawei Digital Power Technologies Co., Ltd.
CPC classification number: H02J3/46 , H02J3/381 , H02M1/0054 , H02M7/539 , H02S40/32 , H02J2300/26
Abstract: A photovoltaic inverter is provided, including an inverter circuit, a data sampling module, and a control module. The inverter circuit includes a switch component and an alternating current output terminal. The data sampling module is configured to collect, from the alternating current output terminal, an instantaneous current value at each sampling point moment in target sampling duration and an instantaneous value of each-phase current at a target moment. The control module is configured to: determine a valid current value of the target sampling duration based on the instantaneous current value at each sampling point moment, determine an upper switching frequency limit and a lower switching frequency limit of an Nth switching period based on the valid current value, and determine a target instantaneous current value IN based on the instantaneous value of each-phase current at the target moment.
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公开(公告)号：US20230327453A1
公开(公告)日：2023-10-12
申请号：US18334653
申请日：2023-06-14
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu Yu , Kai Xin , Yanzhong Zhang , Yongbing Gao
IPC: H02J3/38
CPC classification number: H02J3/38 , H02J2300/24
Abstract: A photovoltaic system includes a controller and two groups of inverters. The two groups of inverters include a positive inverter group and a negative inverter group. The positive inverter group includes at least two inverters: a first inverter and a third inverter. The negative inverter group includes at least two inverters: a second inverter and a fourth inverter. Alternating current output ends of the first inverter and the third inverter are connected in parallel. Direct current input ends of the first inverter and the second inverter are connected in series. Alternating current output ends of the second inverter and the fourth inverter are connected in parallel. Direct current input ends of the third inverter and the fourth inverter are connected in series.
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公开(公告)号：US11626834B2
公开(公告)日：2023-04-11
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: A converter and a power backfeed control method applied to a photovoltaic power generation system are provided. 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.
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公开(公告)号：US20230336121A1
公开(公告)日：2023-10-19
申请号：US18338573
申请日：2023-06-21
Applicant: Huawei Digital Power Technologies Co.,Ltd.
CPC classification number: H02S50/00 , H02S40/32 , H02J3/381 , H02J2300/26
Abstract: An input end of each DC-DC conversion circuit in the photovoltaic system is connected to a corresponding photovoltaic string. Output ends of a plurality of DC-DC conversion circuits are connected in parallel to an input end of a DC-AC conversion circuit. A controller performs a partial IV curve scan on each of the DC-DC conversion circuits, and in a scanning process, controls a total input power of the plurality of DC-DC conversion circuits to be consistent with that existing before the scan; and obtains a sum of the maximum input powers of all the DC-DC conversion circuits based on the maximum input power of each of the DC-DC conversion circuits, where a scanned voltage of the partial IV curve scan is less than an open-circuit voltage. The partial IV curve improves scanning efficiency and obtains a maximum input power in a power-limited state, facilitating subsequent power dispatch and control.
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Patent Agency Ranking
公开(公告)号：US11699906B2
公开(公告)日：2023-07-11
申请号：US17556045
申请日：2021-12-20
Applicant: Huawei Digital Power Technologies Co., Ltd.
CPC classification number: H02J3/381 , H02M7/44 , H02S40/32 , H02J2300/24
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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公开(公告)号：US11342757B2
公开(公告)日：2022-05-24
申请号：US17479820
申请日：2021-09-20
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Abstract: An islanding detection method and apparatus, and a computer-readable storage medium. The detection method includes: determining a harmonic amplitude growth rate and a frequency growth rate of alternating current electricity output by an alternating current port of a grid-tied inverter; determining an islanding disturbance coefficient corresponding to the harmonic amplitude growth rate, where the harmonic amplitude growth rate and the islanding disturbance coefficient are in a monotonically increasing relationship; determining an islanding injection amount based on the frequency growth rate and the islanding disturbance coefficient corresponding to the harmonic amplitude growth rate; controlling, based on the islanding injection amount, the grid-tied inverter to output a reactive power or a reactive current over the alternating current port; and performing islanding detection based on a frequency of the alternating current electricity output by the alternating current port. With this detection method, whether islanding occurs can be accurately detected. When islanding does not occur, disturbance to a power grid is reduced, and grid connection stability is improved. When islanding occurs, it can be quickly detected, and a detection time is relatively short.
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公开(公告)号：US12224707B2
公开(公告)日：2025-02-11
申请号：US18338573
申请日：2023-06-21
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: An input end of each DC-DC conversion circuit in the photovoltaic system is connected to a corresponding photovoltaic string. Output ends of a plurality of DC-DC conversion circuits are connected in parallel to an input end of a DC-AC conversion circuit. A controller performs a partial IV curve scan on each of the DC-DC conversion circuits, and in a scanning process, controls a total input power of the plurality of DC-DC conversion circuits to be consistent with that existing before the scan; and obtains a sum of the maximum input powers of all the DC-DC conversion circuits based on the maximum input power of each of the DC-DC conversion circuits, where a scanned voltage of the partial IV curve scan is less than an open-circuit voltage. The partial IV curve improves scanning efficiency and obtains a maximum input power in a power-limited state, facilitating subsequent power dispatch and control.
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公开(公告)号：US12224682B2
公开(公告)日：2025-02-11
申请号：US18154277
申请日：2023-01-13
Applicant: Huawei Digital Power Technologies Co., Ltd.
IPC: H02M7/538 , H02M1/12 , H02M7/5387 , H02M7/5395
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：US11984800B2
公开(公告)日：2024-05-14
申请号：US17693221
申请日：2022-03-11
Applicant: Huawei Digital Power Technologies Co., Ltd.
CPC classification number: H02M1/32 , H02M7/44 , H02J3/381 , H02J2300/24
Abstract: A power supply system 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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