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公开(公告)号：US20240372505A1
公开(公告)日：2024-11-07
申请号：US18652058
申请日：2024-05-01
Applicant: Nextracker LLC
Inventor： David Kresse , Yang Liu , Alexander W. Au
Abstract: A solar tracker includes a plurality of piers, one end of the piers configured for installation in the earth, a plurality of bearings, each bearing supported by a pier, a torque tube received in the plurality of bearings and configured to support a plurality of solar modules, a plurality of drive motors, each drive motor associated with a pier, a plurality of high efficiency gear boxes, each high efficiency gear box associated with one of the plurality of drive motors; and a plurality of brakes, each brake associated with one of the plurality of high efficiency gear boxes and one of the plurality of drive motors, wherein in combination the plurality of brakes apply sufficient braking force to prevent back driving of the torque tube.
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公开(公告)号：US20240250636A1
公开(公告)日：2024-07-25
申请号：US18596995
申请日：2024-03-06
Applicant: Nextracker LLC
Inventor： Fei Gu , Yang Liu , Venkata Rahul Abbaraju , Eric Martinez
Abstract: Split-cell and multi-panel photovoltaic backtracking control systems and methods allow for increased total power generation during low sun elevation conditions by shading a percentage of panel modules, thereby allowing for a lower angle of incidence on unshaded modules. The control systems and methods involve determining a sun elevation angle, a traditional backtracking angle, a split-cell or multi-panel backtracking angle, a single-cell or single-panel relative light transmission (RLT) based on the single-cell or single-panel backtracking angle, and a split-cell or multi-panel RLT based on the split-cell or multi-panel backtracking angle. If twice the single-cell or single-panel RLT is greater than the split-cell or multi-panel RLT, the split-cell or multi-panel backtracking angle is used; otherwise, the single-cell or single-panel backtracking angle is used. The control systems and methods may further involve determining a diffuse fraction index (DFI) and, if the DFI is greater than a DFI limit, using a DFI tracking angle.
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公开(公告)号：US12047033B2
公开(公告)日：2024-07-23
申请号：US18072335
申请日：2022-11-30
Applicant: Nextracker LLC
Inventor： Chen Li , Yang Liu , Alexander W. Au
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.
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公开(公告)号：US11967921B2
公开(公告)日：2024-04-23
申请号：US17884366
申请日：2022-08-09
Applicant: Nextracker LLC
Inventor： Yang Liu , Alexander W. Au
IPC: H02S20/32 , F24S30/425 , H01L31/042 , H02J7/35 , H02S40/32 , H02S40/34 , H02S40/38 , F24S30/00
CPC classification number: H02S20/32 , F24S30/425 , H01L31/042 , H02J7/35 , H02S40/32 , H02S40/34 , H02S40/38 , F24S2030/11 , H02J2207/20 , H02J2300/24 , Y02E10/50
Abstract: A solar tracker apparatus includes an adjustable hanger assembly that has a clam shell hanger assembly. The clam shell hanger assembly may hold a torque tube comprising a plurality of torque tubes configured together in a continuous length from a first end to a second end. A center of mass of the solar tracker apparatus may be aligned with a center of rotation of the torque tubes, in order to reduce a load of a drive device operably coupled to the torque tube. Solar modules may be coupled to the torque tubes. The solar tracker includes an energy system that includes solar panel, a DC to DC converter, a battery, and a micro-controller. The energy system may facilitate full operation movement of the tracker apparatus without any external power lines.
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公开(公告)号：US11804721B2
公开(公告)日：2023-10-31
申请号：US17202331
申请日：2021-03-15
Applicant: NEXTracker LLC
Inventor： Yang Liu
IPC: H02J7/00 , G05B19/045 , H02J3/38
CPC classification number: H02J7/0018 , G05B19/045 , H02J3/38 , H02J3/381 , G05B2219/24136 , G05B2219/25361 , H02J2300/26
Abstract: A multi-power distributed storage system including a first power source; a second power source electrically connected to a common bus with the first power source; a single input port inverter electrically connected to the common bus. The system including a controller configured to communicate with at least the second power source, and the single input port inverter. The second power source including a plurality of battery banks and a plurality of bi-directional DC/DC converters configured to charge and discharge the plurality of battery banks and provide DC to the single input port inverter.
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Patent Agency Ranking
公开(公告)号：US20230216300A1
公开(公告)日：2023-07-06
申请号：US18074054
申请日：2022-12-02
Applicant: Nextracker LLC
Inventor： Yang Liu , Alexander W. AU , Sandeep Sanjiva Lele
CPC classification number: H02J3/14 , H02J13/00034
Abstract: A common enclosure includes a housing, inverter input connectors and an inverter output connector coupled to the housing, a common DC bus mechanically coupled to the housing and electrically coupled to the inverter input connectors, a common AC bus mechanically coupled to the housing and electrically coupled between the inverter output connector and a power grid connector, a controller mechanically coupled to the housing and electrically coupled to the common DC and AC buses, local controllers coupled to the inverters, decentralized controllers coupled to the local controllers, and a centralized controller in communication with the local controllers. The decentralized controllers generate decentralized control signals for the local controllers based on measured voltages and currents of the electrical power grid and the inverters. The centralized controller transmits centralized control signals to the local controllers to maintain a constant voltage on the common DC bus based on a predicted DC load.
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公开(公告)号：US20230050774A1
公开(公告)日：2023-02-16
申请号：US17884366
申请日：2022-08-09
Applicant: Nextracker LLC
Inventor： Yang Liu , Alexander W. Au
IPC: H02S20/32 , F24S30/425 , H02J7/35
Abstract: A solar tracker apparatus includes an adjustable hanger assembly that has a clam shell hanger assembly. The clam shell hanger assembly may hold a torque tube comprising a plurality of torque tubes configured together in a continuous length from a first end to a second end. A center of mass of the solar tracker apparatus may be aligned with a center of rotation of the torque tubes, in order to reduce a load of a drive device operably coupled to the torque tube. Solar modules may be coupled to the torque tubes. The solar tracker includes an energy system that includes solar panel, a DC to DC converter, a battery, and a micro-controller. The energy system may facilitate full operation movement of the tracker apparatus without any external power lines.
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公开(公告)号：US20230012720A1
公开(公告)日：2023-01-19
申请号：US17948878
申请日：2022-09-20
Applicant: Nextracker LLC
Inventor： Alexander W. Au , Yang Liu
IPC: H02J7/35 , H02J1/10 , H02S40/32 , H02S40/36 , H02S40/38 , H02J3/32 , H02J3/46 , H02J3/38 , H02J7/00
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.
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公开(公告)号：US20220352744A1
公开(公告)日：2022-11-03
申请号：US17868646
申请日：2022-07-19
Applicant: Nextracker LLC
IPC: H02J7/35 , H01L31/053 , 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.
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公开(公告)号：US12294236B2
公开(公告)日：2025-05-06
申请号：US18451142
申请日：2023-08-17
Applicant: NEXTRACKER LLC
Inventor： Chen Li , Yang Liu , Jonathan Kenzo Kamei
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.
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