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    Battery management architectures for flow batteries
    3.
    发明授权
    Battery management architectures for flow batteries 有权

    公开(公告)号：US11522383B2

    公开(公告)日：2022-12-06

    申请号：US16436710

    申请日：2019-06-10

    Applicant: NEXTracker Inc.

    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

    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.

    METHODS AND SYSTEMS FOR DETECTING SHADING FOR SOLAR TRACKERS
    4.
    发明申请
    METHODS AND SYSTEMS FOR DETECTING SHADING FOR SOLAR TRACKERS 有权

    公开(公告)号：US20210091713A1

    公开(公告)日：2021-03-25

    申请号：US17115595

    申请日：2020-12-08

    Applicant: NEXTRACKER INC.

    Inventor： Yang Liu ,  Chen Li

    IPC: H02S20/32 ,  G01S3/781 ,  G05D3/20 ,  G05D3/10 ,  G01S3/782 ,  G06N20/00

    Abstract: A solar tracker system including a tracker apparatus including a plurality of solar modules, each of the solar modules being spatially configured to face in a normal manner in an on sun position in an incident direction of electromagnetic radiation derived from the sun, wherein the solar modules include a plurality of PV strings, and a tracker controller. The tracker controller includes a processor, a memory, a power supply configured to provide power to the tracker controller, a plurality of power inputs configured to receive a plurality of currents from the plurality of PV strings, a current sensing unit configured to individually monitor the plurality of currents, a DC-DC power converter configured to receive the plurality of power inputs powered from the plurality of PV strings to supply power to the power supply, and a motor controller, wherein the tracker controller is configured to track the sun position.

    SYSTEMS AND METHODS OF DC POWER CONVERSION AND TRANSMISSION FOR SOLAR FIELDS
    6.
    发明申请
    SYSTEMS AND METHODS OF DC POWER CONVERSION AND TRANSMISSION FOR SOLAR FIELDS 审中-公开

    公开(公告)号：US20190341776A1

    公开(公告)日：2019-11-07

    申请号：US16402695

    申请日：2019-05-03

    Applicant: NEXTracker Inc.

    Inventor： Alexander W. Au ,  Yang Liu

    IPC: H02J1/10 ,  H02S40/32 ,  H02S40/36 ,  H02S40/38 ,  H02J7/00 ,  H02J7/35 ,  H02J3/38

    Abstract: Systems and methods integrate advanced solar tracker, battery, inverter, and software technologies to improve performance, plant output, and costs. The systems may incorporate an advanced vanadium flow battery (VFB) that is DC-voltage (DV)-coupled to photovoltaic (PV) arrays for high, round-trip efficiency. The systems incorporate a DC architecture that optimizes performance for commercial, industrial, agricultural, and utility applications. A distributed direct current (DC) power system includes a centralized, single-stage inverter; PV arrays; maximum power point tracking (MPPT) converters coupled between the PV arrays and the centralized, single-stage inverter; batteries; and DC-DC battery converters (DCBCs) coupled to the batteries. The MPPT converters maximize solar power production by the PV arrays and minimize mismatch between the PV arrays. The DCBCs manage charge and discharge of the batteries, enable the interconnection of the PV arrays and the batteries, and supply a constant medium voltage to the central inverter.

    Multi Power Source Systems for Photovoltaic Battery Control
    7.
    发明申请
    Multi Power Source Systems for Photovoltaic Battery Control 审中-公开

    公开(公告)号：US20190305163A1

    公开(公告)日：2019-10-03

    申请号：US16364959

    申请日：2019-03-26

    Applicant: NEXTracker Inc.

    Inventor： Chen Li ,  Yang Liu

    IPC: H01L31/053 ,  H02J7/35 ,  H02S10/20

    Abstract: A multi-power source system including a first power source, a second power source in a parallel with the first power source, and a diode preventing power from the second power source to drive the first power source but permitting the first power source to charge the second power source. The system also includes a controller operably coupled to both the first and second power sources, and a plurality of field effect transistor (FETs) arranged in series with one or more of the first power source, the second power source, and the load, wherein controller can switch the plurality of FETs to enable the first power source to drive the load or the second power source to drive the load.

    Systems and methods of DC power conversion and transmission for solar fields
    8.
    发明授权
    Systems and methods of DC power conversion and transmission for solar fields 有权

    公开(公告)号：US11451052B2

    公开(公告)日：2022-09-20

    申请号：US16402695

    申请日：2019-05-03

    Applicant: NEXTracker Inc.

    Inventor： Alexander W. Au ,  Yang Liu

    IPC: H02J1/10 ,  H02S40/32 ,  H02S40/36 ,  H02S40/38 ,  H02J7/00 ,  H02J7/35 ,  H02J3/38

    Abstract: Systems and methods integrate advanced solar tracker, battery, inverter, and software technologies to improve performance, plant output, and costs. The systems may incorporate an advanced vanadium flow battery (VFB) that is DC-voltage (DV)-coupled to photovoltaic (PV) arrays for high, round-trip efficiency. The systems incorporate a DC architecture that optimizes performance for commercial, industrial, agricultural, and utility applications. A distributed direct current (DC) power system includes a centralized, single-stage inverter; PV arrays; maximum power point tracking (MPPT) converters coupled between the PV arrays and the centralized, single-stage inverter; batteries; and DC-DC battery converters (DCBCs) coupled to the batteries. The MPPT converters maximize solar power production by the PV arrays and minimize mismatch between the PV arrays. The DCBCs manage charge and discharge of the batteries, enable the interconnection of the PV arrays and the batteries, and supply a constant medium voltage to the central inverter.

    POWER CONVERTERS AND METHODS OF CONTROLLING SAME
    9.
    发明申请
    POWER CONVERTERS AND METHODS OF CONTROLLING SAME 有权

    公开(公告)号：US20220181975A1

    公开(公告)日：2022-06-09

    申请号：US17437037

    申请日：2020-02-25

    Applicant: NEXTracker Inc.

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

    IPC: H02M3/158 ,  H02M3/335 ,  H02S20/32

    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.

    SYSTEMS AND METHODS FOR PHOTOVOLTAIC DIRECT CURRENT (DC) BUS CONTROL
    10.
    发明申请
    SYSTEMS AND METHODS FOR PHOTOVOLTAIC DIRECT CURRENT (DC) BUS CONTROL 有权

    公开(公告)号：US20220147091A1

    公开(公告)日：2022-05-12

    申请号：US17601921

    申请日：2020-05-04

    Applicant: NEXTracker Inc.

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

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

    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.

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