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公开(公告)号：US11689026B2
公开(公告)日：2023-06-27
申请号：US17658413
申请日：2022-04-07
Applicant: Huawei Technologies Co., Ltd.
Inventor： Rongliang Shi , Kai Xin , Yunfeng Liu
CPC classification number: H02J3/381 , H02M1/00 , H02J2300/26 , H02M1/0009
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：US11171489B2
公开(公告)日：2021-11-09
申请号：US17073864
申请日：2020-10-19
Applicant: Huawei Technologies Co., Ltd.
Inventor： Xinyu Yu , Kai Xin , Fangcheng Liu
IPC: H02J3/38
Abstract: A control method for a string inverter, comprising: in a current/voltage (IV) curve scanning process, controlling an output power of an inverter circuit to be a specified power reference value, and controlling an output voltage of each non-IV curve scanning direct current (DC) to DC (DC-DC) circuit to be a specified voltage reference value, where the specified power reference value is less than or equal to a sum of input powers of all non-IV curve scanning DC-DC circuits the before IV curve scanning process, and where the specified voltage reference value is greater than or equal to a preset percentage of a maximum value in open-circuit voltages, before the IV curve scanning process, of photovoltaic strings connected to all IV curve scanning DC-DC circuits.
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Patent Agency Ranking
公开(公告)号：US20210036520A1
公开(公告)日：2021-02-04
申请号：US17073864
申请日：2020-10-19
Applicant: Huawei Technologies Co., Ltd.
Inventor： Xinyu Yu , Kai Xin , Fangcheng Liu
IPC: H02J3/38
Abstract: A control method for a string inverter, comprising: in a current/voltage (IV) curve scanning process, controlling an output power of an inverter circuit to be a specified power reference value, and controlling an output voltage of each non-IV curve scanning direct current (DC) to DC (DC-DC) circuit to be a specified voltage reference value, where the specified power reference value is less than or equal to a sum of input powers of all non-IV curve scanning DC-DC circuits the before IV curve scanning process, and where the specified voltage reference value is greater than or equal to a preset percentage of a maximum value in open-circuit voltages, before the IV curve scanning process, of photovoltaic strings connected to all IV curve scanning DC-DC circuits.
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公开(公告)号：US10666159B2
公开(公告)日：2020-05-26
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 , H02M1/12 , H03K17/567 , H02M7/5395 , H02J3/38 , H02M7/5387
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：US20190229646A1
公开(公告)日：2019-07-25
申请号：US16369828
申请日：2019-03-29
Applicant: Huawei Technologies Co., Ltd.
Inventor： Fangcheng Liu , Kai Xin , Haibin Guo
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：US20190178923A1
公开(公告)日：2019-06-13
申请号：US16278224
申请日：2019-02-18
Applicant: Huawei Technologies Co., Ltd.
Inventor： Zhangping Shao , Kai Xin , Congyuan Wang
Abstract: An islanding detection method and apparatus for an inverter, and a power supply system to resolve a problem that an existing voltage total harmonic distortion (THD)-based islanding detection method has low islanding detection reliability due to existence of a relatively large detection dead zone. According to this detection method, the voltage total harmonic distortion changes more significantly before and after the islanding effect of the inverter occurs in order to reduce an islanding detection dead zone and improve islanding detection reliability.
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公开(公告)号：US10103640B2
公开(公告)日：2018-10-16
申请号：US14624238
申请日：2015-02-17
Applicant: Huawei Technologies Co., Ltd.
Inventor： Yazhu Zhao , Yunfeng Liu , Kai Xin
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.
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