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公开(公告)号：US10715056B2
公开(公告)日：2020-07-14
申请号：US16369828
申请日：2019-03-29
Applicant: Huawei Technologies Co., Ltd.
Inventor： Fangcheng Liu , Kai Xin , Haibin Guo
IPC: H02M7/537 , H02M7/5387 , H02S40/32 , H02P27/08 , H02M1/12 , H02J3/38 , H03H7/01 , H02M7/5395 , H02M7/487 , H02M1/00
Abstract: A three-phase converter configured to be coupled between a direct current system and an alternating current system to perform interconversion between a direct current and an alternating current, where the three-phase converter includes a switching network, a three-phase filter coupled to the switching network, a sampling circuit coupled to the three-phase filter, a control circuit coupled to the three-phase sampling circuit, an active damping circuit coupled to the control circuit and the sampling circuit, and a modulation circuit coupled between the active damping circuit and the switching network, where the sampling circuit is configured to obtain three-phase currents in the three-phase filter, and send the three-phase currents to the active damping circuit, the active damping circuit is configured to obtain new three-phase modulated waves according to the three-phase currents, and transmit the new three-phase modulated waves to the modulation circuit.
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公开(公告)号：US10345362B2
公开(公告)日：2019-07-09
申请号：US15855396
申请日：2017-12-27
Applicant: Huawei Technologies Co., Ltd.
Inventor： Fangcheng Liu , Kai Xin
IPC: G01R27/16 , G01R27/26 , G01R31/08 , G01R31/44 , H02M7/42 , H02M1/00 , H02H1/00 , H02J3/38 , H02H7/122 , H02M1/084 , H02M7/5387
Abstract: The present disclosure relates to the field of inverters, and to a method for detecting grid connection stability of an inverter and an inverter. The method includes: detecting a line voltage and a current of the alternating current port to obtain a first group of line voltage values and a first group of current values; detecting the line voltage and the current of the alternating current port to obtain a second group of line voltage values and a second group of current values; obtaining an equivalent impedance matrix of the power grid according to the first group of line voltage values, the first group of current values, the second group of line voltage values, and the second group of current values; and determining, by the inverter according to an equivalent admittance matrix and the equivalent impedance matrix, whether a stability requirement of the inverter is met.
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公开(公告)号：US20190199235A1
公开(公告)日：2019-06-27
申请号：US16232741
申请日：2018-12-26
Applicant: Huawei Technologies Co., Ltd.
Inventor： Fangcheng Liu , Kai Xin , Yunfeng Liu
IPC: H02M7/487 , H02J3/38 , H02M7/5387
CPC classification number: H02M7/487 , H02J3/383 , H02M1/12 , H02M7/53871 , H02M7/5395 , H02M2001/123 , H03K17/567
Abstract: A single-phase converter control method and apparatus, includes calculating on a voltage corresponding to a first level output by a single-phase converter, a voltage corresponding to a second level output by the single-phase converter, and a voltage reference value about the voltage corresponding to the first level and the voltage corresponding to the second level to obtain a common-mode modulated-wave change rate of the single-phase converter, where the first level is a direct-current-side positive-bus level, and the second level is a direct-current-side negative-bus level, calculating on a first-phase initial modulated wave of the single-phase converter, a second-phase initial modulated wave of the single-phase converter, and the common-mode modulated-wave change rate to obtain a common-mode modulated wave of the single-phase converter, and calculating on the first-phase initial modulated wave, the second-phase initial modulated wave, and the common-mode modulated wave to obtain a pulse width modulated wave of the single-phase converter.
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公开(公告)号：US11693062B2
公开(公告)日：2023-07-04
申请号：US16913828
申请日：2020-06-26
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Fangcheng Liu , Kai Xin , Yunfeng Liu
CPC classification number: G01R31/52 , G01R31/00 , H02H1/0015 , H02H1/0092 , H02H3/33 , H02H7/20 , H02S50/00 , Y02E10/50
Abstract: A method for processing a direct current electric arc and an apparatus, includes: obtaining a first current which is a direct current input current of a direct current cable of a photovoltaic cell system; obtaining a second current, where the second current is a direct current common mode current of a direct current cable or an alternating current common mode current of an alternating current cable; calculating a correlation coefficient between a frequency domain component of the first current and a frequency domain component of the second current; and when determining that the first current meets an electric arc occurrence condition and the correlation coefficient is greater than or equal to a preset coefficient threshold, skipping sending a direct current electric arc fault alarm. The correlation coefficient is used to reflect a proportion of common mode noise generated by the second current, and the preset coefficient threshold is set.
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公开(公告)号：US11316347B2
公开(公告)日：2022-04-26
申请号：US17247379
申请日：2020-12-09
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Rongliang Shi , Kai Xin , Yunfeng Liu
Abstract: A photovoltaic power system includes a DC/AC inverter circuit, N DC/DC converter circuits that are located at a previous stage of the DC/AC inverter circuit and that are respectively connected to photovoltaic strings, and a controller connected to the DC/AC inverter circuit and the N DC/DC converter circuits. The controller is configured to: perform MPPT control on n DC/DC converter circuits, and perform CPG control on (N−n) DC/DC converter circuits. In the two control manners, a fast and accurate power reserve or limit of a photovoltaic string inverter with any illumination intensity and ambient temperature can be implemented, and fluctuation of a DC bus voltage and AC output power of the photovoltaic string inverter can be eliminated. Control on a virtual synchronous generator of the photovoltaic string inverter is implemented, and a lifespan of the photovoltaic string inverter is prolonged, without a need to add an energy storage element.
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Patent Agency Ranking
公开(公告)号：US11133751B2
公开(公告)日：2021-09-28
申请号：US16692600
申请日：2019-11-22
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Fangcheng Liu , Xiongfei Wang , Kai Xin
Abstract: This application discloses an apparatus, an inverter system, and a method for synchronizing carriers. The apparatus includes a modulation unit, a current processing unit, and a control unit. The control unit can adjust, based on a change trend between an amplitude of a first harmonic current and an amplitude of a second harmonic current and a change trend between a phase of a first carrier and a phase of a second carrier, a phase of an input carrier input into the modulation unit, to decrease an amplitude of a harmonic current output by an inverter and improve stability of a distributed power supply system. Further, a prior-art problem that impact of a harmonic current on a power supply system cannot be reduced by synchronizing carriers in a process of synchronizing carriers based on a zero sequence current is avoided, thereby improving the stability of the distributed power supply system.
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公开(公告)号：US10719371B2
公开(公告)日：2020-07-21
申请号：US16054605
申请日：2018-08-03
Applicant: Huawei Technologies Co., Ltd.
Inventor： Xiaosheng Zeng , Kai Xin , Xiaowen Dong
Abstract: A service control method and a service control apparatus, where the method includes obtaining, a current electricity grid electricity price and a quantity of to-be-executed services, determining an electricity price threshold according to the quantity of the to-be-executed services, decreasing, by the service control apparatus, a quantity of services that are about to be executed by a first quantity when the current electricity grid electricity price is greater than the electricity price threshold, and executing a service according to a reduced quantity of services that are about to be executed, or increasing, by the service control apparatus, a quantity of services that are about to be executed by a second quantity, and executing a service according to an increased quantity of services that are about to be executed when the current electricity grid electricity price is less than the electricity price threshold.
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公开(公告)号：US20150381073A1
公开(公告)日：2015-12-31
申请号：US14747744
申请日：2015-06-23
Applicant: Huawei Technologies Co., Ltd.
Inventor： Haibin Guo , Kai Xin , Li Lu
IPC: H02M7/537
CPC classification number: H02M7/537 , H02M7/53871 , H02M7/5395 , H02M2001/0032 , H02M2001/0054 , Y02B70/1491 , Y02B70/16
Abstract: An inverter control method, apparatus, and system are provided. The method in the embodiments of the present invention includes obtaining power distribution line graph of an inverter switch according to an output power and an input voltage that are of an inverter; when an area to which the inverter belongs is a first area and the inverter switch works at a second frequency, switching the inverter switch to a first frequency; and when the area to which the inverter belongs is a second area and the inverter switch works at the first frequency, switching the inverter switch to the second frequency. In the embodiments of the present invention, whether a working frequency of an inverter switch needs to be changed is determined according to an output power and an input voltage, which improves control efficiency, thereby effectively improving conversion efficiency of an inverter.
Abstract translation: 提供了一种逆变器控制方法，装置和系统。 本发明实施例中的方法包括：根据反相器的输出功率和输入电压获得逆变器开关的配电线图; 当逆变器所属的区域是第一区域并且逆变器开关以第二频率工作时，将逆变器开关切换到第一频率; 并且当变频器所属的区域是第二区域并且逆变器开关以第一频率工作时，将逆变器开关切换到第二频率。 在本发明的实施例中，根据输出功率和输入电压来确定逆变器开关的工作频率是否需要改变，这提高了控制效率，从而有效地提高了逆变器的转换效率。
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公开(公告)号：US20150236607A1
公开(公告)日：2015-08-20
申请号：US14624238
申请日：2015-02-17
Applicant: Huawei Technologies Co., Ltd.
Inventor： Yazhu Zhao , Yunfeng Liu , Kai Xin
CPC classification number: H02M7/003 , H02G5/06 , H02M7/537 , H05K7/1427 , Y10T307/707
Abstract: A power converter, including: at least two inverting modules, where direct current sides of the at least two inverting modules are connected in parallel using a laminated busbar or a circuit board, and the at least two inverting modules run in an interleaved and parallel manner. In the present invention, the power converter is formed by connecting at least two inverting modules in parallel, and the direct current sides of the at least two inverting modules are connected in parallel using the laminated busbar or the circuit board, so that parasitic inductance between inverting modules is small, forming a low parasitic inductance loop. When the at least two inverting modules run in an interleaved and parallel manner, the low parasitic inductance loop counteracts most ripple currents in a circuit, thereby reducing the burden of the ripple currents on a bus capacitor. Therefore, the demand of the power converter provided in the present invention for the bus capacitor is small.
Abstract translation: 一种功率转换器，包括：至少两个反相模块，其中所述至少两个反相模块的直流侧使用层压母线或电路板并联连接，并且所述至少两个反相模块以交错和并行方式运行 。 在本发明中，功率转换器是通过并联连接至少两个反相模块而形成的，并且至少两个反相模块的直流侧使用叠层母线或电路板并联连接，使得寄生电感 反相模块小，形成低寄生电感回路。 当至少两个反相模块以交错和并行方式运行时，低寄生电感环路抵消电路中的大多数纹波电流，从而减少总线电容器上纹波电流的负担。 因此，本发明提供的用于总线电容器的功率转换器的需求很小。
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公开(公告)号：US20240274727A1
公开(公告)日：2024-08-15
申请号：US18589434
申请日：2024-02-28
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Qun Luo , Shuo Wang , Wenming Su , Xiaolian Chen , Kai Xin , Yunfeng Liu
CPC classification number: H01L31/0201 , H01L31/1876
Abstract: A solar cell component includes a first electrode, a second electrode, and a light absorption layer. The first electrode includes a first conductive electrode, and the second electrode includes a second conductive electrode. The light absorption layer is located between the first conductive electrode and the second conductive electrode. The first electrode further includes a first bus electrode connected to a periphery of the first conductive electrode. A sheet resistance of the first bus electrode is less than a sheet resistance of the first conductive electrode, such that a sheet resistance of a peripheral region of the first electrode is less than a sheet resistance of a central region of the first electrode.
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