Energy storage system and management method thereof

Patent metadata

Field	Value
Publication number	US-2017237260-A1
Application number	US-201715431979-A
Country	US
Kind code	A1
Filing date	Feb 14, 2017
Priority date	Feb 15, 2016
Publication date	Aug 17, 2017
Grant date	—

Abstract

An energy storage system includes one or more new and renewable energy power stations generating power with a new or renewable energy source, and an energy storage facility including a plurality of energy storage apparatuses to be charged by one of an external power grid supplying power to a power load and the one or more new and renewable energy power stations, and to be discharged to supply the power to the power load, wherein the plurality of energy storage apparatuses have different charging and/or discharging periods.

First claim

What is claimed is:

1 . An energy storage system, comprising:
one or more new and renewable energy power stations generating power with a new or renewable energy source; and an energy storage facility including a plurality of energy storage apparatuses to be charged by one of an external power grid supplying power to a power load and the one or more new and renewable energy power stations, and to be discharged to supply power to the power load, wherein the plurality of energy storage apparatuses have different charging and/or discharging periods.

2 . The energy storage system of claim 1 , wherein the plurality of energy storage apparatuses have output characteristics and prices different from each other.

3 . The energy storage system of claim 2 , wherein each of the plurality of energy storage apparatuses includes a battery.

4 . The energy storage system of claim 3 , wherein a first energy storage apparatus includes is a short duration battery and a second energy storage apparatus includes a long duration battery, the short duration battery having a charging and/or discharging period that is relatively shorter than that of the long duration battery.

5 . The energy storage system of claim 4 , wherein the first energy storage apparatus is controlled to cope with a peak load.

6 . The energy storage system of claim 4 , wherein the second energy storage apparatus is controlled to cope with a base load.

7 . The energy storage system of claim 4 , wherein a third energy storage apparatus includes is an ultra-short duration battery having a charging and/or discharging period relatively shorter than that of the short duration battery.

8 . The energy storage system of claim 3 , further comprising a battery management system (BMS) to store type and characteristic information of the plurality of energy storage apparatuses and to control a charge amount and a discharge amount of the plurality of energy storage apparatuses according to the stored type and characteristic information.

9 . The energy storage system of claim 1 , wherein each of the plurality of energy storage apparatuses include a power conditioning system (PCS) to manage power of the energy storage apparatus, the PCS configured to supply power generated by the external power grid or the new and renewable energy power station to the power load or to another one of the plurality of energy storage apparatuses, to perform conversion between DC and AC of power, and to monitor power consumed by the power load.

10 . The energy storage system of claim 1 , wherein the plurality of energy storage apparatuses are configured for peak cut operation.

11 . The energy storage system of claim 1 , wherein the plurality of energy storage apparatuses are configured for peak shaving operation.

12 . A method of managing an energy storage system, the energy storage system comprising one or more new and renewable energy power stations generating power with a new or renewable energy source, and an energy storage facility including a plurality of energy storage apparatuses, wherein the plurality of energy storage apparatuses have different charging and/or discharging periods, the method comprising steps of:
charging a first energy storage apparatus with power generated from at least one of the one or more new and renewable energy power stations; and charging a second energy storage apparatus with power supplied by an external power grid.

13 . The method of claim 12 , further comprising a step of charging the second energy storage apparatus with power stored in the first energy storage apparatus during an idle period when a value obtained by subtracting a charge amount of the second energy storage apparatus from a charge amount of the first energy storage apparatus is more than or equal to a set value.

14 . The method of claim 13 , wherein during quick charge of the second energy storage apparatus, a charge rate of the second energy storage apparatus is increased by increasing a discharge output of the first energy storage apparatus.

15 . The method of claim 12 , further comprising a step of supplying power to a power load, wherein when power is supplied from the plurality of energy storage apparatuses, control is performed so that the first energy storage apparatus is discharged first.

16 . The method of claim 15 , wherein the second energy storage apparatus is controlled to be continuously discharged after the first energy storage apparatus starts to discharge.

17 . The method of claim 12 , further comprising a step of charging the first energy storage apparatus with power stored in the second energy storage apparatus during an idle period when a value obtained by subtracting a charge amount of the first energy storage apparatus from a charge amount of the second energy storage apparatus is more than or equal to a set value.

18 . The method of claim 12 , wherein the plurality of energy storage apparatuses perform peak cut or peak shaving operation in a time period in which highest load occurs.

19 . The method of claim 12 , wherein each of the plurality of energy storage apparatuses includes a battery.

Assignees

• Doosan Heavy Ind & Construction Co Ltd

Inventors

• Rhie Young Hoon
• Yoon Ju Young
• Park Sung Ku

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J13/0006

  Electricity · mapped topic

• H02J3/387

  Electricity · mapped topic

• H02M7/44

  by static converters · CPC title

• H02J3/383 Primary

  Electricity · mapped topic