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

IPC: H02J3/38 ,  H02M1/00

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.

公开(公告)号：US11336094B2

公开(公告)日：2022-05-17

申请号：US17081076

申请日：2020-10-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Rongliang Shi ,  Zhangping Shao ,  Kai Xin

IPC: H02J3/01 ,  H02J3/38 ,  H02M1/12 ,  H02M1/44 ,  H02M7/539

Abstract: An inverter includes an inverter circuit; an alternating current filter, where an input port of the alternating current filter is connected to an output port of the inverter circuit; an alternating current electromagnetic interference (EMI) filter; and a first alternating current switch, connected between an output port of the alternating current filter and an input port of the alternating current EMI filter. The first split capacitor is disposed between the first alternating current switch and the input port of the alternating current EMI filter; and when the first alternating current switch is turned off, the first split capacitor is disconnected from the output port of the alternating current filter, and the first split capacitor is connected to a circuit in which an alternating current system connected to the output port of the alternating current EMI filter is located, to suppress harmonic distortion of the alternating current system.

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

IPC: H02J7/34 ,  H02J1/10 ,  H02J3/38 ,  H02M1/00

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.