Energy storage system
AssigneeCummins Power Generation IP, Inc.
InventorsMichelle Hunt, Elias M. Ayana, Bradford K. Palmer
Life of this patent
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Abstract
Systems and methods for controlling power flow to and from an energy storage system are provided. One energy storage system includes an energy storage device and a bidirectional inverter configured to control a flow of power into or out of the energy storage device via a plurality of phases. The energy storage system further includes a controller configured to control the bidirectional inverter based on a load condition on one or more phases. The controller is configured to control the bidirectional inverter to store power generated by a generator set in the energy storage device and transmit power from the energy storage device to a load driven by the generator set in response to detecting a load imbalance between the phases.
Claims25
An energy storage system comprising:
- an energy storage device;
- a bidirectional inverter configured to control a flow of power into or out of the energy storage device;
- and
- a controller configured to:
- detect an unbalanced load condition on a plurality of phases of a local power grid coupled to one or more generator sets, the plurality of phases comprising a first phase and a second phase more heavily loaded than the first phase, the controller configured to control the bidirectional inverter to at least one of:
- store power in the energy storage device from the first phase;
- or
- source power from the energy storage device to the second phase.
A method of controlling a flow of power to and from an energy storage system, the method comprising:
- determining, at a controller of the energy storage system, a load condition on one or more of a plurality of phases of a local alternating current (AC) grid coupled to one or more generator sets;
- and
- controlling a bidirectional inverter of the energy storage system to store power from the local AC grid in an energy storage device of the energy storage system and transmit-power from the energy storage device to a load driven by the one or more generator sets on the local AC grid in response to detecting a load imbalance between the plurality of phases to mitigate the load imbalance.
A hybrid generator system comprising:
- a generator set configured to generate power to drive a load;
- and
- an energy storage system comprising:
- an energy storage device;
- a bidirectional inverter configured to control a flow of power into or out of the energy storage device via a plurality of phases of the generator set;
- and
- a controller configured to control the bidirectional inverter based on a load condition on one or more of the plurality of phases, wherein the controller is configured to control the bidirectional inverter to store power generated by the generator set in the energy storage device and transmit power from the energy storage device to the load in response to detecting a load imbalance between the plurality of phases of the generator set to correct the load imbalance on the generator set.
An energy storage system comprising:
- an energy storage device;
- a bidirectional inverter configured to control a flow of power into or out of the energy storage device via a plurality of phases;
- and
- a controller configured to:
- detect a load change transient on one or more phases of a plurality of phases of a local power grid and source power from the energy storage device to one or more loaded phases of the plurality of phases or store power to the energy storage device from one or more unloaded phases of the plurality of phases to balance the phases and reduce the load change transient for one or more coupled gensets.
An energy storage system comprising:
- an energy storage device;
- a bidirectional inverter configured to control a flow of power into or out of the energy storage device via a plurality of phases;
- and
- a controller configured to:
- detect a load imbalance on a plurality of phases of a local power grid and control the bidirectional inverter to balance the plurality of phases by storing power in the energy storage device from one or more unloaded phases of the plurality of phases.
Dependencies are inferred from the claim text.