公开(公告)号：US20230400489A1

公开(公告)日：2023-12-14

申请号：US18331079

申请日：2023-06-07

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Yuandong Qian ,  Cheng Liang ,  Jiawang Li ,  Yongheng Qian ,  Nianan Pan ,  Zisi Tian ,  Jin Zhang ,  He Li ,  Jingjing Wang ,  Houzhi Tan

IPC: G01R27/02 ,  H02M7/44

CPC classification number: G01R27/025 ,  H02M7/44

Abstract: An inverter and a method for detecting insulation impedance of the inverter are provided. During grid-connected operation of the inverter, the method includes: controlling a power supply to output two different test signals, and recording voltages of a power grid to ground corresponding to the two test signals; and calculating the insulation impedance to ground of the inverter during the grid-connected operation of the inverter according to the two test signals and the voltages of the power grid to ground corresponding to the two test signals. According to the present disclosure, the power supply outputs different test signals to disturb the voltage of the power grid to ground, so as to detect insulation impedance of the inverter during grid-connected operation of the inverter.

公开(公告)号：US10938208B2

公开(公告)日：2021-03-02

申请号：US16238985

申请日：2019-01-03

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Renxian Cao ,  Yilei Gu ,  Jun Xu ,  Xinyu Wang ,  Nianan Pan

IPC: H02J3/01 ,  H02S40/30 ,  H02S40/32 ,  H02S40/34 ,  H02S40/36 ,  H02J3/38 ,  H02M7/5387 ,  H02M7/49 ,  H02M1/00

Abstract: A medium-high voltage photovoltaic (PV) power generation system is provided. A PV string of the system is insulated from the ground via an insulator of a medium-high voltage withstanding level, so that the PV string is applicable under a high voltage level. The PV strings are connected to cascade modules. An output voltage of series-connected cascade modules is grid-connected to a 10 kV power grid through a three-phase filter, without a power booster transformer or a high-frequency isolated DC/DC converter in a conventional power station, thereby improving the system efficiency.

公开(公告)号：US10862422B2

公开(公告)日：2020-12-08

申请号：US15906340

申请日：2018-02-27

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Lei Tao ,  Nianan Pan ,  Zhiqiang Han ,  Ai Wang

IPC: H02S40/36 ,  H02S40/34 ,  H02S50/00 ,  H02H1/00 ,  H02H7/20 ,  H02S40/30 ,  H02H3/04 ,  H02H3/087 ,  H02H3/20 ,  H02S40/32

Abstract: A wire connection terminal for a photovoltaic string is provided. The wire connection terminal includes: a terminal connector, a fuse and a printed circuit board (PCB). The terminal connector is connected to a positive electrode or a negative electrode of the photovoltaic string. The fuse is configured to prevent the photovoltaic string from outputting an excessive current. The PCB is configured to sample an output current and an output voltage of the photovoltaic string, communicate with an inverter, and control the photovoltaic string to disconnect from a direct current bus and output abnormal data for display when the output current and/or the output voltage of the photovoltaic string is abnormal or a system failure occurs.

公开(公告)号：US09673731B2

公开(公告)日：2017-06-06

申请号：US14920217

申请日：2015-10-22

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Lin Cheng ,  Nianan Pan ,  Zhicheng Wang ,  Lei Tao

IPC: H02M1/36 ,  H02M7/493 ,  H02M7/44 ,  H02H7/122

CPC classification number: H02M7/44 ,  H02H7/1222 ,  H02H7/1227 ,  H02M7/493

Abstract: Provided are a parallel inverter system, and a shutdown control method and a shutdown control device for the parallel inverter system. A shutdown instruction is determined and responded according to a level of the shutdown instruction. The shutdown instruction is determined to be an emergency shutdown instruction under certain emergency shutdown conditions, and a driving signal for the power switch devices of the inverter apparatus is needed to be instantly locked out. The shutdown instruction is determined to be a normal shutdown instruction under non-emergency shutdown conditions, a switch-off signal is transmitted to alternating-current switches connected to the inverter apparatus to be shut down, states of the alternating-current switches connected to the inverter apparatus to be shut down are detected, the driving signal for the power switch devices of the inverter apparatus to be shut down is instantly locked out in a case that the alternating-current switches are switched off.