US 12,756,219 B2Granted

Energy storage system and control method of energy storage system

AssigneeLG Energy Solution, Ltd.

InventorJongcheol Kim

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Abstract

An energy storage system may comprise: a plurality of power converters configured to perform DC/DC conversion in connection with respective battery racks; a power conversion system (PCS) configured to perform power conversion between the power converters and a power grid; and a battery section controller interworking with the plurality of power converters and the power conversion system, wherein the battery section controller is configured to control a first power converter among the plurality of power converters to perform constant voltage (CV) mode control for maintaining a voltage of a DC link at a constant level, to check a state of a first battery rack to which the first power converter is connected, and to change a subject to perform the CV mode control for the DC link according to the state of the first battery rack.

Claims20

Dependent claims

An energy storage system, comprising:

a plurality of power converters configured to perform a DC/DC conversion for a plurality of battery racks, respectively, the plurality of power converters including:
a first power converter connected to a first battery rack among the plurality of battery racks;
and
a plurality of other power converters connected respectively to a plurality of other battery racks, other than the first battery rack, among the plurality of battery racks;
a power conversion system (PCS) configured to perform power conversion between the plurality of power converters and a power grid;
and
a battery section controller interworking with the plurality of power converters and the power conversion system, wherein the battery section controller is configured:
to control the first power converter to perform a constant voltage (CV) mode control for maintaining a voltage of a DC link at a constant level,
to check a state of the first battery rack, and
to select a second power converter from among the plurality of other power converters to perform the CV mode control for the DC link according to the state of the first battery rack and states of the plurality of other battery racks.

7 more elements

A control method of an energy storage system including a plurality of power converters configured to perform a DC/DC conversion respectively for a plurality of battery racks, the plurality of power converters including a first power converter connected to a first battery rack among the plurality of battery racks and including a plurality of other power converters connected respectively to a plurality of other battery racks other than the first battery rack among the plurality of battery racks, the method comprising:

controlling the first power converter to perform a constant voltage (CV) mode control for maintaining a voltage of a DC link at a constant level;
checking a state of the first battery rack;
and
selecting a second power converter from among the plurality of other power converters to perform the CV mode control for the DC link according to the state of the first battery rack and states of the plurality of other battery racks.

1 more element

A battery section controller in an energy storage system including a plurality of power converters configured to perform a DC/DC conversion respectively for a plurality of battery racks, the plurality of power converters including a first power converter connected to a first battery rack among the plurality of battery racks and including a plurality of other power converters connected respectively to a plurality of other battery racks other than the first battery rack among the plurality of battery racks, and the battery section controller being in connection with the plurality of power converters, the battery section controller comprising:

at least one processor;
and
a memory configured to store at least one instruction executed by the at least one processor,
wherein the at least one instruction includes:
an instruction to control the first power converter to perform a constant voltage (CV) mode control for maintaining a voltage of a DC link at a constant level;
an instruction to check a state of the first battery rack;
and
an instruction to select a second power converter from among the plurality of other power converters to perform the CV mode control for the DC link according to the state of the first battery rack and states of the plurality of other battery racks.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/024,203Filed 26 Jul 2022
Priority: KR 10-2021-009748026 Jul 2021
Published: US 2023/0268754 A124 Aug 2023
Granted: 6 Oct 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02J 7/933
Regulation of charging or discharging current or voltage: the cycle being controlled or terminated in response to electric parameters
H02J 7/82
Including monitoring or indicating arrangements: control of state of charge [SOC]
H02J 2207/20
Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries: charging or discharging characterised by…
H02J
Power supply and charging