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1.发明授权公开(公告)号：US11146181B2
公开(公告)日：2021-10-12
申请号：US16911600
申请日：2020-06-25
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Fangcheng Liu , Kai Xin , Yunfeng Liu
Abstract: A control method and apparatus for a single-phase five-level converter are provided. The method includes: obtaining a first-phase initial modulated wave and a second-phase initial modulated wave of the single-phase five-level converter; obtaining a first-level modulated wave, a second-level modulated wave, a third-level modulated wave, a fourth-level modulated wave, and a fifth-level modulated wave that are output by the single-phase five-level converter; calculating the first-level modulated wave, the second-level modulated wave, the third-level modulated wave, the fourth-level modulated wave, the fifth-level modulated wave, the first-phase initial modulated wave, and the second-phase initial modulated wave, to obtain a common-mode modulated wave of the single-phase five-level converter; and calculating 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 five-level converter. Implementing the embodiments of this application can increase a system response speed and improve system reliability.
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公开(公告)号：US09601262B2
公开(公告)日：2017-03-21
申请号：US14584940
申请日：2014-12-29
Applicant: Huawei Technologies Co., Ltd.
Inventor： Fei Ye , Yunfeng Liu , Dianbo Fu
CPC classification number: H01F38/023 , H01F2038/026 , H02M7/487 , H02M7/49
Abstract: A coupled inductor and a power converter includes at least two input ends, an output end, a common magnetic core, at least two first windings, and at least two second windings. The common magnetic core includes at least two magnetic cylinders, and the number of the at least two magnetic cylinders corresponds to the number of the at least two input ends; and one first winding and one second winding are twined in parallel on each cylinder among the at least two magnetic cylinders, and the first windings and the second windings on the at least two magnetic cylinders are mutually connected between the at least two input ends and the output end to form mutually coupled inductances and when currents that flow into the at least two input ends are equal, make the first winding and the second winding on each cylinder generate opposite magnetic potentials.
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公开(公告)号：US20170076849A1
公开(公告)日：2017-03-16
申请号：US15358573
申请日：2016-11-22
Applicant: Huawei Technologies Co., Ltd.
Inventor： Yanshen Hu , Yunfeng Liu , Fei Ye
CPC classification number: H01F27/24 , H01F3/10 , H01F17/04 , H01F27/306 , H01F27/346 , H01F37/00 , H01F2027/348 , H02M1/00 , H02M2001/0083
Abstract: A coupled inductor and a power converter includes a magnetic core and at least two windings. The magnetic core includes at least two magnetic cylinders and two opposite magnet yokes. The at least two magnetic cylinders are disposed between the two opposite magnet yokes, the at least two windings are respectively wound around the at least two magnetic cylinders, the at least two windings are in a one-to-one correspondence with the at least two magnetic cylinders, and the at least two windings do not extend out of the two opposite magnet yokes in at least one direction, where each direction of the at least one direction is a direction perpendicular to side faces of the two opposite magnet yokes.
Abstract translation: 耦合电感器和功率转换器包括磁芯和至少两个绕组。 磁芯包括至少两个磁性圆筒和两个相对的磁轭。 所述至少两个磁性圆柱体设置在所述两个相对的磁轭之间，所述至少两个绕组分别缠绕在所述至少两个磁性圆柱体上，所述至少两个绕组与所述至少两个磁体圆筒形成一一对应关系 并且至少两个绕组在至少一个方向上不延伸出两个相对的磁轭，其中至少一个方向的每个方向是垂直于两个相对的磁轭的侧面的方向。
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公开(公告)号：US09385632B2
公开(公告)日：2016-07-05
申请号：US14555808
申请日：2014-11-28
Applicant: Huawei Technologies Co., Ltd.
Inventor： Yanshen Hu , Grover Victor Torrico-Bascopé , Dianbo Fu , Yunfeng Liu
IPC: H02M7/5387 , H02M7/5395 , H02M7/487 , H02M7/49 , H02M1/12 , H02M1/00
CPC classification number: H02M7/5395 , H02M1/12 , H02M7/487 , H02M7/49 , H02M2001/0064 , H02M2001/007
Abstract: A multi-level inverter includes two N-level inverter units with pulse width modulation waves staggered by a phase of 180 degrees, and N is an integer greater than or equal to 3; a direct current power source module, where an output end thereof is connected to input ends of the two N-level inverter units; a transformer, where the transformer includes a primary side and a secondary side, an inductor of the primary side and an inductor of the secondary side are coupled, and one end of the inductor of the primary side and one end of the inductor of the secondary side are connected to output ends of the two N-level inverter units respectively. The two N-level inverter units are reversely coupled, and the other end of the inductor of the primary side and the other end of the inductor of the secondary side are connected.
Abstract translation: 多电平逆变器包括两个N级反相器单元，其中脉冲宽度调制波以180度相位交错，N为大于或等于3的整数; 直流电源模块，其输出端连接到两个N电平逆变器单元的输入端; 变压器，其中变压器包括初级侧和次级侧，初级侧的电感器和次级侧的电感器被耦合，并且次级侧的电感器的一端和电感器的一端的一端 侧分别连接到两个N电平逆变器单元的输出端。 两个N级逆变器单元反向耦合，并且次级侧的电感器的初级侧的另一端和另一端连接。
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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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Patent Agency Ranking
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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公开(公告)号：US20170076850A1
公开(公告)日：2017-03-16
申请号：US15360572
申请日：2016-11-23
Applicant: Huawei Technologies Co., Ltd.
Inventor： Yunfeng Liu , Fei Ye , Yanshen Hu
IPC: H01F27/255 , G05F3/02
CPC classification number: H01F27/255 , G05F3/02 , H01F3/12 , H01F38/08 , H01F2003/106 , H02M1/00
Abstract: A coupled inductor and a power converter. The coupled inductor includes a magnetic core and at least two windings. The magnetic core includes at least two first magnetic cylinders, at least one second magnetic cylinder, and two opposite magnet yokes. The at least two first magnetic cylinders and the at least one second magnetic cylinder are disposed between the two opposite magnet yokes, the at least two windings are respectively located on the at least two first magnetic cylinders, and the at least two windings are in a one-to-one correspondence with the at least two first magnetic cylinders. Leakage inductance of the coupled inductor is increased by adding a second magnetic cylinder between the opposite magnet yokes of the coupled inductor, thereby meeting a requirement of system stability when the coupled inductor is connected to the power converter.
Abstract translation: 耦合电感和功率转换器。 耦合电感器包括磁芯和至少两个绕组。 磁芯包括至少两个第一磁性圆筒，至少一个第二磁性圆筒和两个相对的磁轭。 所述至少两个第一磁性圆筒和所述至少一个第二磁性圆筒设置在所述两个相对的磁轭之间，所述至少两个绕组分别位于所述至少两个第一磁性圆柱体上，并且所述至少两个绕组处于 与至少两个第一磁性圆筒一一对应。 通过在耦合电感器的相对的磁轭之间增加第二磁筒来增加耦合电感器的漏电感，从而当耦合电感器连接到功率转换器时满足系统稳定性的要求。
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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：US20150062984A1
公开(公告)日：2015-03-05
申请号：US14542302
申请日：2014-11-14
Applicant: HUAWEI TECHNOLOGIES CO.,LTD.
Inventor： Yanshen Hu , Yunfeng Liu , Lei Shi
Abstract: A power converter, includes a first terminal and a second terminal which are connected to a direct current; a third terminal connected to an alternating current; N multi-level bridge arms connected in parallel to the first terminal and the second terminal, where the N multi-level bridge arms work in a parallel-interleaved manner, each multi-level bridge arm of the N multi-level bridge arms includes an alternating current node, and multiple time-varying levels are generated at the alternating current node, where the multiple levels are more than two levels; and a coupling inductor, including N windings coupled by one common magnetic core, where one end of each winding of the N windings is connected to an alternating current node of one multi-level bridge arm of the N multi-level bridge arms, and the other end of each winding of the N windings is connected to the third terminal.
Abstract translation: 功率转换器包括连接到直流电的第一端子和第二端子; 连接到交流电的第三端子; N个多电平桥臂与第一端子和第二端子并联连接，其中N个多电平桥臂以并行交错的方式工作，N个多电平桥臂的每个多电平桥臂包括一个 交流节点和多个时变电平在交流电节点处产生，其中多个电平超过两个电平; 以及耦合电感器，包括通过一个公共磁芯耦合的N个绕组，其中N个绕组的每个绕组的一端连接到N个多电平桥臂的一个多电平桥臂的交流节点，并且 N绕组的每个绕组的另一端连接到第三端子。
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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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