-
公开(公告)号：US20200076302A1
公开(公告)日：2020-03-05
申请号：US16538725
申请日：2019-08-12
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Jiacai ZHUANG , Jun XU , Bing ZHANG , Peng WANG , Peng WEN
Abstract: A multi-level boost apparatus. Voltage allocation among N first switches is achieved by arranging the N voltage dividing modules. It is prevented that the second one to the N-th one of the first switches break down and fail due to overvoltage. By arranging an (i−1)-th clamp branch at a common node between an (i−1)-th second switch and an i-th second switch, a voltage bore by the i-th second switch is clamped at a difference between a voltage across the fourth branch (namely, an output voltage of the multi-level boost apparatus) and a voltage across the corresponding clamp branch. The risk is avoided that a second one to the N-th one of the second switches break down due to overvoltage at an instant of being powered, in a case that the input voltage is low.
-
公开(公告)号：US20200076301A1
公开(公告)日：2020-03-05
申请号：US16537056
申请日：2019-08-09
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Jiacai ZHUANG , Jun XU , Bing ZHANG , Peng WANG , Peng WEN
Abstract: A multi-level boost apparatus. Voltage allocation among N first switches is achieved by connecting N voltage dividing modules, sequentially connected in series, in parallel with the N first voltage switches, respectively. Thereby, a voltage across each of the N first switches is within a safety range. Even if an input voltage is high and a voltage across a flying capacitor is zero at an instant of being powered, it is prevented that a second one to an N-th one of the N first switches break down due to overvoltage.
-
公开(公告)号：US20180342873A1
公开(公告)日：2018-11-29
申请号：US15912005
申请日：2018-03-05
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Xinyu WANG , Jun XU , Yilei GU , Yu GU
Abstract: A control apparatus and a combiner box are provided. In a case that component maintenance needs to be performed, an optimizer connected to the combiner box is controlled to operate in a safe mode, and a switch-off signal is outputted to disconnect the combiner box from an inverter if an output current of the combiner box is smaller than a threshold. In a case that the maintenance is completed, the optimizer connected to the combiner box is controlled to operate in a maximum power point tracking mode, and the combiner box is connected to the inverter if an input voltage of the combiner box is greater than an output voltage of the combiner box, that is, if an output voltage of a corresponding string increases gradually to a value exceeding a direct current bus voltage.
-
4.发明申请公开(公告)号：US20180054065A1
公开(公告)日：2018-02-22
申请号：US15581748
申请日：2017-04-28
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Le YANG , Shineng YU , Jun XU
IPC: H02J3/38 , H02J3/18 , H02M7/5387
CPC classification number: H02M7/5387 , H02J3/18 , H02J3/1842 , H02J3/383 , H02J3/385 , Y02E10/58 , Y02E40/22
Abstract: Provided are a cascaded photovoltaic grid-connected inverter and a control method and control device thereof. The method includes: determining whether at least one of inverter units of the inverter is over-modulated; if yes, calculating a maximum reactive power and a minimum reactive power permitted to be injected to a power grid in a situation that a power factor of a system is not less than a minimum permitted value; simulating an operation state of the inverter after the maximum reactive power is injected to the power grid and determining whether each of the inverter units in the operation state is in a modulating region; if yes, injecting a suitable reactive power to the power grid; and if no, controlling the inverter to exit an operation mode of independently performing maximum power point tracking control on each photovoltaic panel.
-
公开(公告)号：US20180026549A1
公开(公告)日：2018-01-25
申请号：US15581723
申请日：2017-04-28
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Abstract: Provided are a method and a device for controlling an operation of an inverter. The method includes: determining whether a direct current side voltage of the inverter is greater than an operation voltage setting threshold; and if no, controlling the inverter to operate according to a five level control strategy; and if yes: adjusting the direct current side voltage by using a maximum power tracking algorithm; adjusting linearly a floating capacitor voltage of the inverter based on the adjusted direct current side voltage; determining whether the adjusted floating capacitor voltage is in a preset range; and if yes, controlling the inverter to operate according to a five level control strategy; and if no, controlling the inverter to operate according to a seven level control strategy.
-
Patent Agency Ranking
6.发明申请公开(公告)号：US20170294875A1
公开(公告)日：2017-10-12
申请号：US15474022
申请日：2017-03-30
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Abstract: Provided are a cascaded photovoltaic grid-connected inverter, a control method and a control device for the same. The method includes: determining whether at least one of inverter units of the cascaded photovoltaic grid-connected inverter is over-modulated; injecting a reactive current to a power grid to make a grid-connected current effective value greater than or equal to √{square root over (2)}*idcmin, in a case that at least one of the inverter units is over-modulated; determining a voltage U0 required for grid connection for the cascaded photovoltaic grid-connected inverter corresponding to a current grid-connected current effective value; and adjusting an output active voltage of each of the inverter units according to Ujd=Pj/P0*U0d, and adjusting an output reactive voltage of each of the inverter units in a case that none of the inverter units is over-modulated.
-
公开(公告)号：US20230126969A1
公开(公告)日：2023-04-27
申请号：US17915396
申请日：2021-03-08
Applicant: Sungrow Power Supply Co., Ltd.
Inventor： Yu Yang , Yanfei Yu , Xinyu Wang , Jun XU
Abstract: A photovoltaic assembly turnoff device, and a photovoltaic system. The rapid turnoff method includes: after receiving a start signal, a photovoltaic assembly turnoff device controls itself to be turned on, so that a photovoltaic assembly connected thereto achieves electric energy output; then, the photovoltaic assembly turnoff device can measure a state parameter thereof to determine whether a corresponding inverter channel in a photovoltaic system has a fault; if the corresponding inverter channel in the photovoltaic system has the fault, control the photovoltaic assembly turnoff device to be turned off, so that the photovoltaic assembly connected thereto stops the electric energy output; if the corresponding inverter channel in the photovoltaic system has no fault, always keep the photovoltaic assembly turnoff device to be turned on.
-
8.发明申请公开(公告)号：US20190238088A1
公开(公告)日：2019-08-01
申请号：US16239256
申请日：2019-01-03
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Jiacai ZHUANG , Yilei GU , Jun XU , Xinyu WANG
CPC classification number: H02S40/32 , H02J3/01 , H02J3/385 , H02M3/24 , H02M3/33561 , H02M7/4807 , H02M7/49 , H02M7/797 , H02M2001/007 , H02M2001/0077 , H02M2001/008 , Y02E10/563
Abstract: A photovoltaic solid-state transformer, a photovoltaic inverter system and a bidirectional high-voltage transformer are provided. The photovoltaic solid-state transformer includes: multiple single phase modules and a filter. Each of the single phase modules includes multiple multiple-output isolated DC/DC converters and multiple cascade DC/AC modules, where each of the multiple-output isolated DC/DC converters includes a DC/AC module, a high frequency transformer and multiple AC/DC modules. The multiple single phase modules are connected to the grid via the filter in a star connection or a delta connection. The DC/DC converters and the cascade DC/AC modules are simple logical switches and have conversion efficiency higher than 99%, such that the photovoltaic solid-state transformer has a reduced volume, and an improved overall efficiency higher than 98.5%.
-
公开(公告)号：US20170324249A1
公开(公告)日：2017-11-09
申请号：US15474061
申请日：2017-03-30
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Renxian CAO , Yilei GU , Yu GU , Jun XU
CPC classification number: H02J3/383 , F21S8/085 , F21S9/03 , F21Y2115/10 , H02M1/10 , H02M1/126 , H02M3/158 , H02M7/487 , H02M7/53871 , H02M7/5395 , H02M2001/0077 , H02P7/28 , Y02E10/563
Abstract: An AC-DC photovoltaic device is provided, including: a photovoltaic module, a direct current side capacitor, a DC-PWM power switching circuit and a controller. The direct current side capacitor is connected in parallel with an output terminal of the photovoltaic module. An input terminal of the DC-PWM power switching circuit is connected with the output terminal of the photovoltaic module. The DC-PWM power switching circuit includes a controllable switch transistor. The controller is configured to output a switch control signal to control a switching state of the controllable switch transistor in the DC-PWM power switching circuit, to control the DC-PWM power switching circuit to output a direct current PWM wave in a case that the switch control signal is a direct current modulation signal, and output an alternating current PWM wave in a case that the switch control signal is an alternating current modulation signal.
-
10.发明公开公开(公告)号：US20230179146A1
公开(公告)日：2023-06-08
申请号：US17921950
申请日：2020-10-30
Applicant: Sungrow Power Supply Co., Ltd.
Inventor： Yu Yang , Qiaodi CHEN , Yuqi PENG , Jun XU
CPC classification number: H02S50/10 , H02J1/102 , H02J2300/24
Abstract: The Disclosed in the present application are a power electronic device on a direct-current side of a photovoltaic system, and a test system and a control method therefor, achieving a simple, fast, and low-cost functional test on the power electronic device during a production process or a troubleshooting process of the power electronic device on the direct-current side of the photovoltaic system. The power electronic device is used for detecting a fluctuation of an electric signal parameter of an input end of the power electronic device; when the fluctuation meets a preset condition, the device is switched from a limited output state to a non-limited output state; the fluctuation of the electric signal parameter of the input end is generated by applying a disturbance to the input end of the power electronic device on the direct-current side of the photovoltaic system by a direct-current power supply having a disturbance output.
-
-
-
-
-
-
-
-
-
Search Results
21
records
(took 0.02 seconds)
