中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

37 records (took 0.018 seconds)

    Systems and methods for photovoltaic direct current (DC) bus control
    13.
    发明授权
    Systems and methods for photovoltaic direct current (DC) bus control 有权

    公开(公告)号：US11907000B2

    公开(公告)日：2024-02-20

    申请号：US17601921

    申请日：2020-05-04

    Applicant: NEXTracker LLC

    Inventor： Yang Liu ,  Alexander W. Au ,  Fei Gu

    IPC: G05F1/67 ,  H02J3/38 ,  H02J7/35

    CPC classification number: G05F1/67 ,  H02J3/381 ,  H02J7/35 ,  H02J2207/20 ,  H02J2300/26

    Abstract: Solar power systems and methods utilize DC power transmission and centralized power inversion. The solar power systems include a photovoltaic (PV) bus system and a fixed bus system. The PV system utilizes a control mode handoff control method, which includes determining that a local maximum power point tracking (MPPT) control is enabled; in response to determining that the local MPPT control is enabled, starting an MPPT mode timer; performing local MPPT; determining that the MPPT mode timer is greater than a predetermined period; and, in response to determining that the MPPT mode timer is greater than a predetermined period, handing off MPPT control to the next MPPT controller. The distributed MPPT control method may include sequential MPPT control, adaptive ΔV MPPT control, and/or power limiting control. The fixed bus system includes PV string-level MPPT controllers and a fixed DC input central inverter or multiple fixed DC modular inverters.

    POWER CONVERTERS AND METHODS OF CONTROLLING SAME
    14.
    发明公开
    POWER CONVERTERS AND METHODS OF CONTROLLING SAME 审中-公开

    公开(公告)号：US20230344266A1

    公开(公告)日：2023-10-26

    申请号：US18344725

    申请日：2023-06-29

    Applicant: Nextracker LLC

    Inventor： Chen Li ,  Yang Liu ,  Mohammed Salmaan Khan ,  Jonathan Kenzo Kamei ,  Sandeep Sanjiva Lele

    IPC: H02J7/35 ,  H02M3/158 ,  H02S20/32

    CPC classification number: H02J7/35 ,  H02M3/1582 ,  H02S20/32 ,  H02P27/08

    Abstract: A power converter converts a medium-voltage output from a solar module to an appropriate voltage to power a solar tracker system. The power converter includes a voltage divider having at least two legs, a first semiconductor switch subassembly coupled in parallel with a first leg of the voltage divider, and a second semiconductor switch subassembly coupled in parallel with a second leg of the voltage divider. The power converter may be a unidirectional or a bidirectional power converter. In implementations, the signals for driving the semiconductor switches of the first and second semiconductor switch subassemblies may be shifted out of phase from each other. In implementations, if the bus voltages to the semiconductor switches are not balanced, the pulse width of the driving signal of the semiconductor switch supplied with the higher bus voltage is decreased for at least one cycle.

    Battery management architectures for flow batteries
    15.
    发明授权
    Battery management architectures for flow batteries 有权

    公开(公告)号：US11757297B2

    公开(公告)日：2023-09-12

    申请号：US18075317

    申请日：2022-12-05

    Applicant: Nextracker LLC

    Inventor： Chen Li ,  Yang Liu ,  Jonathan Kenzo Kamei

    IPC: H01M10/44 ,  H01M10/46 ,  H02J7/04 ,  H02J7/35 ,  H02J7/00 ,  H01M8/04858 ,  H01M4/36 ,  H01M8/18 ,  H02S20/32

    CPC classification number: H02J7/04 ,  H01M4/368 ,  H01M8/04902 ,  H01M8/188 ,  H02J7/0068 ,  H02J7/35 ,  H02S20/32

    Abstract: Systems and methods for managing flow batteries utilize a battery management controller (BMC) coupled between a flow battery and a DC/DC converter, which is coupled to an electrical grid or a photovoltaic device via an inverter. The inverter converts an AC voltage to a first DC voltage and the DC/DC converter steps down the first DC voltage to a second DC voltage. The BMC includes a first power route, a second power route, and a current source converter coupled to the second power route. The BMC initializes the flow battery with a third DC voltage using the current source converter until a sensing circuit senses that the voltage of the flow battery has reached a predetermined voltage. The sensing circuit may include a capacitor, which has a small capacitance and is coupled across each cell of the flow battery, coupled in series between two resistors having very large resistances.

    SYSTEMS AND METHODS FOR TRACKER-LEVEL PROTECTION
    16.
    发明公开
    SYSTEMS AND METHODS FOR TRACKER-LEVEL PROTECTION 审中-公开

    公开(公告)号：US20230170841A1

    公开(公告)日：2023-06-01

    申请号：US18072335

    申请日：2022-11-30

    Applicant: Nextracker LLC

    Inventor： Chen Li ,  Yang Liu ,  Alexander W. AU

    IPC: H02S20/32 ,  H02S40/38 ,  H02S50/10

    CPC classification number: H02S20/32 ,  H02S40/38 ,  H02S50/10

    Abstract: A solar tracking system includes a solar array, a support structure configured to support the solar array, a driveshaft coupled to the support structure, a base configured to rotatably support the driveshaft, and an articulation system coupled to the driveshaft and configured to articulate the driveshaft relative to the base. The articulation system includes a gearbox coupled to the driveshaft. The solar tracking system also includes a motor mechanically operably coupled to the gearbox to cause the driveshaft to rotate, and a controller that determines a fault caused by the winding up of the driveshaft, and, in response to determining the fault, shorting the windings of the motor and/or providing power, which is generated by the motor when the unwinding driveshaft drives the rotation of the motor, to a load, such as an energy storage device, a resistive load, and/or a heating element.

    BATTERY MANAGEMENT ARCHITECTURES FOR FLOW BATTERIES
    17.
    发明公开
    BATTERY MANAGEMENT ARCHITECTURES FOR FLOW BATTERIES 审中-公开

    公开(公告)号：US20230170729A1

    公开(公告)日：2023-06-01

    申请号：US18075317

    申请日：2022-12-05

    Applicant: Nextracker LLC

    Inventor： Chen Li ,  Yang Liu ,  Jonathan Kenzo Kamei

    IPC: H02J7/04 ,  H02J7/35 ,  H02J7/00 ,  H01M8/04858 ,  H01M4/36 ,  H01M8/18

    CPC classification number: H02J7/04 ,  H02J7/35 ,  H02J7/0068 ,  H01M8/04902 ,  H01M4/368 ,  H01M8/188 ,  H02S20/32

    Abstract: Systems and methods for managing flow batteries utilize a battery management controller (BMC) coupled between a flow battery and a DC/DC converter, which is coupled to an electrical grid or a photovoltaic device via an inverter. The inverter converts an AC voltage to a first DC voltage and the DC/DC converter steps down the first DC voltage to a second DC voltage. The BMC includes a first power route, a second power route, and a current source converter coupled to the second power route. The BMC initializes the flow battery with a third DC voltage using the current source converter until a sensing circuit senses that the voltage of the flow battery has reached a predetermined voltage. The sensing circuit may include a capacitor, which has a small capacitance and is coupled across each cell of the flow battery, coupled in series between two resistors having very large resistances.

    Fixed DC bus and hydrogen generation system
    19.
    发明授权
    Fixed DC bus and hydrogen generation system 有权

    公开(公告)号：US12224703B2

    公开(公告)日：2025-02-11

    申请号：US17389192

    申请日：2021-07-29

    Applicant: NEXTracker LLC

    Inventor： Alexander W. Au ,  Venkata Rahul Abbaraju ,  Yang Liu ,  Wesley Chu

    IPC: H02S40/32 ,  H02J3/38 ,  H02J7/34 ,  H02J15/00

    Abstract: A distributed direct current power system including an inverter to invert DC to alternating current (AC), a plurality of photovoltaic (PV) strings, and a plurality of maximum power point tracking (MPPT) converters coupled between the plurality of photovoltaic (PV) strings, respectively, and the central inverter, the plurality of MPPT converters configured to maximize solar power production by the plurality of PV strings and minimize mismatch between the plurality of PV strings. The system also including a plurality of batteries, a plurality of DC-DC battery converters (DCBC) coupled to the plurality of batteries and configured to manage charge and discharge of the plurality of batteries, enable interconnection of the plurality of PV strings and the plurality of batteries, and supply a constant medium DC voltage to the central inverter, and a hydrogen generation system in electrical communication with the inverter, the photovoltaic strings, or the batteries.

Patent Agency Ranking