公开(公告)号：US20210044110A1

公开(公告)日：2021-02-11

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 ,  H02M1/44 ,  H02M1/12 ,  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：US20230155386A1

公开(公告)日：2023-05-18

申请号：US18156672

申请日：2023-01-19

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Mingquan ZHAO ,  Zhangping SHAO ,  Haibin GUO

IPC: H02J3/36 ,  H02J3/12

CPC classification number: H02J3/36 ,  H02J3/12

Abstract: Embodiments of this application provide a direct current bus voltage control method and apparatus, and a power system, and relate to the field of electric power technologies, to quickly identify a voltage between an inverter circuit and an alternating current grid, so as to timely control a voltage of a direct current bus, thereby improving stability of the power system. The method includes: obtaining an electrical parameter between the conversion circuit and the direct current bus; generating a predicted voltage between the inverter circuit and the alternating current grid based on the electrical parameter and a voltage prediction model; and controlling a voltage between the conversion circuit and the direct current bus based on the predicted voltage.

公开(公告)号：US20190280484A1

公开(公告)日：2019-09-12

申请号：US16420496

申请日：2019-05-23

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhangping SHAO ,  Kai XIN ,  Haibin GUO

IPC: H02J3/38 ,  H02M7/5387

Abstract: An inverter anti-islanding control system includes a phase-shift loop (10) and a drive circuit (20). The phase-shift loop (10) includes a first input end (11), a second input end (12), a third input end (13), a fourth input end (14), a first output end (15), and a second output end (16). The drive circuit (20) includes a first input end (21), a second input end (22), a third input end (23), and an output end (24). The first output end (15) of the phase-shift loop (10) is connected to the first input end (21) of the drive circuit (20), and the second output end (16) of the phase-shift loop (10) is connected to the second input end (22) of the drive circuit (20). In the inverter anti-islanding control system, when an inverter is in an island state, a frequency of an inverter alternating current end voltage is deviated to a second frequency by using the phase-shift loop (10), so that the second frequency triggers frequency protection to disconnect the inverter from an electrical network, to be specific, the inverter is out of the island state.