公开(公告)号：US20240048179A1

公开(公告)日：2024-02-08

申请号：US18488161

申请日：2023-10-17

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Fuqiang XU ,  Kai XIN ,  Peng DONG

IPC: H04B3/54 ,  H04B3/30

CPC classification number: H04B3/54 ,  H04B3/30

Abstract: A power line communication (PLC) system includes a PLC signal transmitting end, a PLC signal receiving end, and a power electronic apparatus. The PLC signal transmitting end is connected to the PLC signal receiving end through a power line, and the power electronic apparatus is connected to the power line. The power electronic apparatus is configured to increase output impedance in a first PLC communication frequency band, to reduce interference from an output current of the power electronic apparatus to a PLC signal in the first PLC communication frequency band. The first PLC communication frequency band is a PLC communication frequency band in which the PLC signal transmitting end sends the PLC signal to the PLC signal receiving end. In this way, the interference from the power electronic apparatus to the PLC signal in the first PLC communication frequency band can be reduced without adding an additional passive filter.

公开(公告)号：US20250023489A1

公开(公告)日：2025-01-16

申请号：US18770904

申请日：2024-07-12

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Peng DONG ,  Xinyu YU ,  Kai XIN ,  Yunfeng LIU

IPC: H02M7/487 ,  H02M1/42 ,  H02M7/797

Abstract: A power converter includes a power conversion circuit, a bus capacitor, and a controller. A direct current input end of the power conversion circuit is configured to connect to a direct current power supply through a direct current bus. An alternating current output end of the power conversion circuit is configured to connect to an alternating current power grid through a point of common coupling (PCC). The controller is configured to: in response to that a difference between a voltage across two ends of the positive bus capacitor and a voltage across two ends of the negative bus capacitor is greater than a specified threshold, control the power converter to inject a second harmonic current into the alternating current power grid, to reduce the difference between the voltage across the two ends of the positive bus capacitor and the voltage across the two ends of the negative bus capacitor.

公开(公告)号：US20240204654A1

公开(公告)日：2024-06-20

申请号：US18589857

申请日：2024-02-28

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Mingquan ZHAO ,  Kai XIN ,  Peng DONG

IPC: H02M1/32 ,  H02J3/16 ,  H02M1/00 ,  H02M1/44 ,  H02M7/44

CPC classification number: H02M1/322 ,  H02J3/16 ,  H02M1/0009 ,  H02M1/0043 ,  H02M1/44 ,  H02M7/44

Abstract: A power converter control method includes: determining a phase angle difference between a phase angle of a voltage output by the power converter and a phase angle of a power grid voltage; and if the phase angle difference is greater than or equal to a first angle threshold, setting a d-axis current reference value and a q-axis current reference value that are used to determine a modulation voltage of the power converter to preset fixed values; calculating a first modulation voltage of the power converter based on the d-axis current reference value, the q-axis current reference value, and a power grid current; calculating a compensation voltage of the power converter based on a preset virtual resistance parameter and the power grid current; and using a sum of the first modulation voltage and the compensation voltage as a total modulation voltage.

公开(公告)号：US20230336119A1

公开(公告)日：2023-10-19

申请号：US18338770

申请日：2023-06-21

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Xinyu YU ,  Kai XIN ,  Peng DONG ,  Yongbing GAO ,  Yanzhong ZHANG

IPC: H02S40/34 ,  H02S40/32 ,  H02J3/38

CPC classification number: H02S40/32 ,  H02J3/381 ,  H02S40/34 ,  H02J2300/26

Abstract: An example system includes an inverter and at least one combiner box. The combiner box includes a plurality of direct current-direct current (DC-DC) circuits and one controller. The controller is configured to: when an output voltage of the combiner box is greater than or equal to a first preset voltage and less than or equal to a second preset voltage, control the combiner box to output a maximum power. When the output voltage of the combiner box is greater than the second preset voltage, the controller controls an output power of the combiner box to decrease as the output voltage increases. The second preset voltage is greater than the first preset voltage, and the maximum power is a sum of maximum powers of all photovoltaic strings connected to the combiner box.

公开(公告)号：US20230147775A1

公开(公告)日：2023-05-11

申请号：US18154277

申请日：2023-01-13

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Kai XIN ,  Peng DONG ,  Junjie LI

IPC: H02M7/5387 ,  H02M7/5395 ,  H02M1/12

CPC classification number: H02M7/53873 ,  H02M7/5395 ,  H02M1/123

Abstract: A common-mode voltage injection control method and apparatus for an inverter. For the method and apparatus, a common-mode voltage for a DPWM mode is calculated based on three-phase port voltages and an output power command; a common-mode voltage for an MPC modulation mode is calculated based on the direct current bus voltage, the three-phase port voltages, and the output power command; a modulation proportion is determined based on a maximum phase voltage peak value of the three-phase port voltages, the direct current bus voltage, and a power factor of the output power command; and a common-mode injection voltage is generated based on the common-mode voltage for the DPWM mode, the modulation proportion, and the common-mode voltage for the MPC modulation mode.