公开(公告)号：US11038512B2

公开(公告)日：2021-06-15

申请号：US17105029

申请日：2020-11-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Dongsheng Yang ,  Fangcheng Liu ,  Xiongfei Wang

IPC: H03L7/091 ,  H03L7/099

Abstract: Embodiments of this application provide a phase-locking apparatus and a phase-locking method. The phase-locking apparatus includes an amplitude adjustment unit, an amplitude and phase detector connected to the amplitude adjustment unit, a first loop filter connected to the amplitude and phase detector, a second loop filter connected to the amplitude and phase detector, a first oscillator connected to the first loop filter, and a second oscillator connected to the second loop filter. The amplitude adjustment unit, the amplitude and phase detector, the first loop filter, and the first oscillator form a loop; and the amplitude and phase detector, the second loop filter, and the second oscillator form another loop. According to the embodiments of this application, a dual-loop structure of the phase-locking apparatus can weaken frequency coupling between a positive-sequence component generated by the phase-locking apparatus and a negative-sequence component generated by the phase-locking apparatus.

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

IPC: H02M7/23 ,  H02M1/12 ,  H02M5/458 ,  H02M7/49

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.