Electricity providing system including battery energy storage system

• US 10,090,685 B2
• Filed: 12/04/2015
• Issued: 10/02/2018
• Est. Priority Date: 03/10/2015
• Status: Active Grant

• Current Assignee: LSIS Co. Ltd. (LS Corporation)
• Original Assignee: LSIS Co. Ltd. (LS Corporation)
• Inventors: Shim, Jae Seong
• Primary Examiner(s): Grant, Robert
• Assistant Examiner(s): Trischler, John
• Application Number:
  US14/960,146
• Publication Number:
  US 20160268818A1
• Time in Patent Office: 1,033 Days
• Field of Search: 320134
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y02E 40/10 Flexible AC transmission systems [FACTS]
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

Disclosed is a power supply system. A power supply system according to an embodiment includes a system control unit configured to set a first system droop curve for a plurality of batteries and a charging control unit configured to control charging/discharging of the plurality of batteries on the basis of the first system droop curve.

Claims

1. A power supply system comprising a battery energy storage system comprising:

a system control unit configured to set a first system droop curve for a plurality of batteries correlated with a load; and

a charging control unit configured to control charging/discharging of the plurality of batteries correlated with the load on the basis of the first system droop curve,

wherein the charging control unit obtains state of charge (SOC) level information from the plurality of batteries correlated with the load,

the system control unit sets a unique second system droop curve on the basis of an average of the SOC level information obtained from the plurality of batteries correlated with the load, and

the second system droop curve is applied to all batteries correlated with the load.

2. The power supply system according to claim 1, wherein the system control unit sets the first system droop curve on the basis of at least one of preset data or a system frequency.

3. The power supply system according to claim 2,

wherein the system control unit sets the second system droop curve on the basis of a piece of the SOC level information which has a largest difference with a reference value among pieces of the SOC level information obtained from the plurality of batteries,

wherein the reference value is at least one of a value set at an initial system designing time or a value based on the system frequency.

4. The power supply system according to claim 1,

wherein the charging control unit obtains SOC level information from the plurality of batteries,

wherein the system control unit determines a reference frequency for generating a second system droop curve on the basis of the SOC level information obtained from the charging control unit.

5. The power supply system according to claim 4, wherein the reference frequency is determined for each battery.

6. The power supply system according to claim 4,

wherein the system control unit transmits the determined reference frequency to the charging control unit,

wherein the charging control unit generates the second system droop curve on the basis of the received reference frequency, and controls the batteries on the basis of the second system droop curve.