Combined electric power generations' supply system in off grid independent operation

    公开(公告)号:US11916397B2

    公开(公告)日:2024-02-27

    申请号:US17426579

    申请日:2019-08-29

    IPC分类号: H02J3/46 H02J3/32 H02P9/02

    摘要: A combined electric power generations' supply system includes an AC power generator that supplies power by off grid independent operation, a DC power supply device, an inverter that converts DC power output by the DC power supply device into AC power. The rotation calculation unit calculates a value relating to a rotation of a rotor when driving the virtual power generator according to an active power command based on a rotor model calculates a value relating to the rotation of the rotor of the virtual power generator and the active power command. The output determination unit determines values relating to an active power and a reactive power to be output to the inverter based on the calculated value relating to the rotation. The modulation control unit performs control of a pulse width modulation of the inverter based on the determined value relating to the active power and reactive power. A time constant relating to synchronization power of the rotor model matches a time constant relating to synchronization power with the AC power generator.

    Energy storage system and photovoltaic energy storage system

    公开(公告)号:US11909217B2

    公开(公告)日:2024-02-20

    申请号:US17478561

    申请日:2021-09-17

    摘要: The present disclosure discloses an energy storage system. The energy storage system includes M cell strings, N energy storage converters, first ends of the N energy storage converters are coupled to at least one of the M cell strings, and second ends of the N energy storage converters are configured to connect to a power grid. A first end of a first energy storage converter is coupled to Q cell strings in the M cell strings, and the first energy storage converter includes a DC/AC conversion unit and at least one DC/DC conversion unit. A first DC/DC conversion unit is coupled to at least one of the Q cell strings by using the first end of the first energy storage converter, the first DC/DC conversion unit is coupled to the DC/AC conversion unit, and the DC/AC conversion unit is coupled to the power grid by using a second end of the first energy storage converter. The first DC/DC conversion unit is configured to perform adaptation between a voltage of the DC/AC conversion unit and a voltage of a cell string. Therefore, a cell capacity is fully used, and a waste of the cell capacity is reduced.

    PROSUMERS MULTISERVICE OPERATION MANAGEMENT SYSTEM, FOR DISTRIBUTED STORAGE NETWORKS

    公开(公告)号:US20240055863A1

    公开(公告)日:2024-02-15

    申请号:US18246321

    申请日:2021-09-23

    IPC分类号: H02J3/32 H02J13/00

    CPC分类号: H02J3/32 H02J13/00002

    摘要: The present invention refers to a system for managing distributed energy storage systems like a Virtual Power Plant (VPP). The system is adapted to process grid services requests from grid operators and/or market agents, and to dynamically set clusters of energy storage devices based on properties of the energy storage devices, and selecting those energy storage devices that are suitable to fulfill grid service operation requirements of at least one grid service. The system is further adapted to allow injection or absorption of energy to or from the grid during a time period, through at least one cluster of selected energy storage devices, to provide at least one grid service demanded by grid operators and/or market agents. The system of the invention enables the participation of a battery energy storage system in a plurality of grid services at the same time, so as to optimize the use of prosumers battery storage capacity, and enlarge prosumers participation in the electricity market.