公开(公告)号：US10027125B2

公开(公告)日：2018-07-17

申请号：US14969411

申请日：2015-12-15

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Nianan Pan ,  Lin Cheng ,  Lei Tao

IPC: H02M7/44 ,  H02J3/38 ,  H02M7/493 ,  H02S40/32 ,  H02M1/12

Abstract: A control method and apparatus for photovoltaic inverters connected in parallel at an AC side are provided and the method includes the following steps: detecting a first direct voltage of the first inverter and a second direct voltage of the second inverter; obtaining a difference between the first direct voltage and the second direct voltage; and adjusting the direct voltages of the inverters to control the difference to be within a predetermined range and control a common-mode voltage in the common-mode loop to be within a predetermined common-mode voltage range.

公开(公告)号：US12003105B2

公开(公告)日：2024-06-04

申请号：US17642113

申请日：2020-06-11

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Guohua Xiang ,  Lin Cheng ,  Jie Ding ,  Nianan Pan

IPC: H02J3/10 ,  H02J3/38 ,  H02J13/00

CPC classification number: H02J3/10 ,  H02J3/381 ,  H02J13/00002

Abstract: The present application discloses a multi-channel grid-connected power generation system and a control method therefor, which lowers the system cost while reducing no-load losses of all step-up transformers. Multi-channel energy conversion devices in the system are each connected in parallel, by means of a step-up transformer, to the same collector line, one end of the collector line is connected to the grid by means of a switch device, and the on-off switching of the switch device is controlled by a control unit. The control unit sends a switch-off command to the switch device when same has determined that all of the energy conversion devices have entered a non-operating state. In the off state of the switch device, at least one energy conversion device, when meeting a start-up condition, starts to operate as a voltage source, and establishes an alternating-current voltage, so that the phase difference and amplitude difference of voltages at two ends of the switch device are both stable within an allowable error range. Then, the control unit sends a switch-on command to the switch device, and the other energy conversion devices start to operate as a current source to transfer energy to the grid.

公开(公告)号：US11722072B2

公开(公告)日：2023-08-08

申请号：US17592544

申请日：2022-02-04

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Houlai Geng ,  Xing Li ,  Menglin Cao ,  Lin Cheng

IPC: H02M7/49 ,  H02M7/483 ,  H02M7/501

CPC classification number: H02M7/501 ,  H02M7/49 ,  H02J2300/24

Abstract: An inverter circuit control method and a device thereof are provided. In the control method, after determining a DC bus voltage and an output leakage current of a target inverter circuit, a modulation harmonic wave to be injected into a SPWM signal is adjusted according to the DC bus voltage or the output leakage current if it is determined according to the DC bus voltage that the target inverter circuit satisfies a preset modulation condition, such that total harmonic distortion of a current of the target inverter circuit is within a preset range. The DC bus voltage and the output leakage current of the target inverter circuit are used as references for adjusting the modulation harmonic wave, ensuring total harmonic distortion of the current of the target inverter circuit to be within a preset range.

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.

公开(公告)号：US20220329176A1

公开(公告)日：2022-10-13

申请号：US17592544

申请日：2022-02-04

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Houlai Geng ,  Xing Li ,  Menglin Cao ,  Lin Cheng

IPC: H02M7/501 ,  H02M7/49

Abstract: An inverter circuit control method and a device thereof are provided. In the control method, after determining a DC bus voltage and an output leakage current of a target inverter circuit, a modulation harmonic wave to be injected into a SPWM signal is adjusted according to the DC bus voltage or the output leakage current if it is determined according to the DC bus voltage that the target inverter circuit satisfies a preset modulation condition, such that total harmonic distortion of a current of the target inverter circuit is within a preset range. The DC bus voltage and the output leakage current of the target inverter circuit are used as references for adjusting the modulation harmonic wave, ensuring total harmonic distortion of the current of the target inverter circuit to be within a preset range.

公开(公告)号：US20250088144A1

公开(公告)日：2025-03-13

申请号：US18723822

申请日：2022-11-28

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Haitao Li ,  Huan Nie ,  Lin Cheng

IPC: H02S40/32 ,  H02H7/20 ,  H02J3/38

Abstract: A photovoltaic system, an inverter starting method and a photovoltaic energy storage system are provided. The photovoltaic system includes: a shutdown device, a controller and an inverter. The inverter includes a DC-DC circuit and an inverter circuit; the DC-DC circuit includes at least two Boost circuits; an input terminal of the shutdown device is connected to a photovoltaic panel, and an output terminal of the shutdown device is connected to an input terminal of the DC-DC circuit; an output terminal of the DC-DC circuit is connected to an input terminal of the inverter circuit. The method includes: controlling the inverter to perform a start-up process in multiple stages in a case that a start-up time of the inverter is greater than a single turned-on period of the shutdown device, where the shutdown device is turned on once in each of the multiple stages.

公开(公告)号：US11387643B2

公开(公告)日：2022-07-12

申请号：US16959982

申请日：2019-12-31

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Cheng Liang ,  Nianan Pan ,  Zhicheng Wang ,  Lin Cheng ,  Longlin Sun ,  Jigui Feng

IPC: H02H7/122

Abstract: A method, a device, and a system for protecting parallel-connected topology units are provided. A target signal transmitted via the signal synchronization line is obtained, and the target signal is sent to other controllers based on a type of the target signal. If the target signal is a carrier synchronization signal, the current power module is controlled to perform carrier synchronization and to be in a working mode. If the target signal is a power module fault signal, the current power module is controlled to be in a shutdown mode. The signal synchronization lines between the parallel-connected topology units are shared in a time-sharing manner, where the carrier synchronization signal is transmitted if the power module works normally, and the power module fault signal is transmitted if the power module is faulty. The topology units monitor the transmitted target signal in real time for fast synchronous protection.

公开(公告)号：US10103544B2

公开(公告)日：2018-10-16

申请号：US15415509

申请日：2017-01-25

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Lin Cheng ,  Nianan Pan ,  Lei Tao ,  Longlin Sun

IPC: H02J3/00 ,  H01H47/00 ,  H02J3/40 ,  H02J3/38

Abstract: Disclosed are a medium and high voltage grid-connected power generation system, a medium and high voltage grid-connected system, and a control circuitry thereof. The voltage of the medium and high voltage power grid is collected through the control circuitry. A power grid amplitude and a power grid phase synchronization signal are obtained, and then sent to an inverter unit through a communication line.

公开(公告)号：US10003198B2

公开(公告)日：2018-06-19

申请号：US14850649

申请日：2015-09-10

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Nianan Pan ,  Lin Cheng ,  Lei Tao

IPC: H02J3/38 ,  H02M7/42 ,  G01R23/20 ,  H02M1/12 ,  H02J3/01 ,  H02M1/00

CPC classification number: H02J3/383 ,  G01R23/20 ,  H02J3/01 ,  H02J3/38 ,  H02J3/386 ,  H02J3/387 ,  H02M1/12 ,  H02M2001/0012 ,  Y02E10/563 ,  Y02E10/763 ,  Y02E40/40

Abstract: A method and device for monitoring and suppressing a resonance are provided, which are applied to a grid-connected generation system. A current sample voltage of a preset sample point of the grid-connected generation system is monitored in a real time manner; amplitudes of harmonics of the current sample voltage are acquired using a preset algorithm; it is verified whether a resonance occurs in the grid-connected generation system currently based on the acquired amplitudes of the harmonics; in a case that the resonance occurs in the grid-connected generation system, current corrections of parameters of inverters in the grid-connected generation system are acquired according to a preset rule and the parameters of the inverters are adjusted using the current corrections and a selected resonance suppressing algorithm.