公开(公告)号：US20240339837A1

公开(公告)日：2024-10-10

申请号：US18577626

申请日：2022-07-08

Applicant: Nextracker LLC

Inventor： Francesco BORRELLI ,  Chen LI ,  Yang LIU ,  Alexander AU

IPC: H02J3/32 ,  H02J3/10 ,  H02J3/38

CPC classification number: H02J3/32 ,  H02J3/10 ,  H02J3/381 ,  H02J2300/24

Abstract: An electrical system includes inverters coupled together in parallel and coupled to a common DC bus. The electrical system also includes a common AC bus coupled between outputs of the inverters and an electrical power grid. The electrical system also includes local controllers coupled to the inverters and decentralized controllers coupled to the local controllers. The decentralized controllers measure voltages and currents of the electrical power grid and the inverters and generate decentralized control signals for the local control controllers based on the measured voltages and currents. The electrical system also includes a centralized controller in communication with the local controllers. The centralized controller predicts a DC load and generates centralized control signals for the local controllers to maintain a constant voltage on the common DC bus based on the predicted DC load.

公开(公告)号：US20240231397A1

公开(公告)日：2024-07-11

申请号：US18430290

申请日：2024-02-01

Applicant: Nextracker LLC

Inventor： Yudong MA ,  Francesco BORRELLI ,  Yang LIU ,  Allan DALY

IPC: G05D3/10 ,  G01S3/786 ,  G01W1/00 ,  H02S20/32 ,  H02S40/38

CPC classification number: G05D3/105 ,  G01S3/7861 ,  H02S20/32 ,  H02S40/38 ,  G01W1/00

Abstract: A solar tracking system comprises multiple solar panel modules forming a grid of solar panel modules, wherein the multiple solar panel modules are movable relative to a solar source independently of each other; and a control system configured to orient each of the multiple solar panel modules to the solar source independently of each other based on a performance model to optimize an energy output from the grid of solar panel modules, wherein the performance model predicts an energy output from the grid of solar panel modules based on a topography of the area containing the grid of solar panel modules and weather conditions local to each of the solar panel modules.

公开(公告)号：US20240152169A1

公开(公告)日：2024-05-09

申请号：US18409086

申请日：2024-01-10

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.