KR101660513B1 - Method for controlling output of long period or short period in energy storage system - Google Patents

Method for controlling output of long period or short period in energy storage system Download PDF

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KR101660513B1
KR101660513B1 KR1020140190336A KR20140190336A KR101660513B1 KR 101660513 B1 KR101660513 B1 KR 101660513B1 KR 1020140190336 A KR1020140190336 A KR 1020140190336A KR 20140190336 A KR20140190336 A KR 20140190336A KR 101660513 B1 KR101660513 B1 KR 101660513B1
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South Korea
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soc
ess
long
period
short
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KR1020140190336A
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Korean (ko)
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KR20160079956A (en
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최인선
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주식회사 효성
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The present invention relates to a system for storing renewable energy including wind power and solar heat, and a method of controlling a short-term periodic output in an energy storage system including a short-cycle ESS (Energy Storage System) and a long- Controlling the output of the long-period ESS according to a current SOC state of the short-cycle ESS if the current state of charge (SOC) of the long-period ESS is within a predetermined upper limit SOC and a lower limit SOC, Controlling the discharging of the long-period ESS according to a predetermined discharging time when the current SOC of the long-period ESS is equal to or higher than the upper limit SOC, . According to the present invention, in the renewable energy storage system, the output fluctuation rate of the renewable energy is suppressed and the stable output is provided, so that the rapid change of the system can be prevented in advance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy storage system,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of controlling short-term periodic power output in an energy storage system, and more particularly, to an energy storage system of renewable energy such as wind power and solar heat.

Environmental degradation, resource depletion, etc., there is a growing interest in a system capable of storing electric power and efficiently utilizing stored electric power. Also, the importance of renewable energy such as solar power generation is increasing. In particular, new and renewable energy uses natural resources that are infinitely supplied, such as solar power, wind power, and tidal power, and does not cause pollution in the development process.

In general, the new and renewable energy system is a system that researches and develops new energy sources to solve problems such as energy shortage and environmental pollution. It is used to convert existing fossil energy, or to use the existing fossil energy including sunlight, water, geothermal, Energy that converts and uses renewable energy, and future energy sources for a sustainable energy supply system. These renewable energy systems include wind power generation systems and solar power generation systems.

Conventionally, energy storage systems (energy storage systems) for storing new and renewable energy use short-period batteries with high output characteristics such as lithium ion batteries for stable output. .

Japanese Patent Laid-Open Publication No. 2013-172495

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a new and renewable energy storage system that minimizes the capacity of a short cycle battery for stabilizing the output of new and renewable energy, And to provide a short-term periodic output control method capable of stably outputting renewable energy.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a system for storing renewable energy including wind power and solar heat, and a system for storing energy in an energy storage system including a short cycle ESS (Energy Storage System) and a long period ESS (Energy Storage System) Wherein when the current state of charge (SOC) of the long-period ESS is within a predetermined upper-limit SOC and a lower-limit SOC, the output of the long-period ESS according to the current SOC state of the short- Controlling the discharging of the long-period ESS according to a predetermined discharging time if the current SOC of the long-period ESS is equal to or less than the upper-limit SOC, and if the current SOC of the long- And controlling the long-period ESS to charge.

Controlling the output of the long-period ESS according to the current SOC state of the short-period ESS, if the current SOC that is a state of charge of the short-period ESS is equal to or greater than a reference SOC of the predetermined short- And controlling the discharging of the long-period ESS if the current SOC of the short-period ESS is equal to or less than the reference SOC of the short-period ESS.

The energy storage system controls the charging or discharging output of the long-period ESS according to the target SOC. If the target SOC-current SOC is a positive value, it charges the target SOC by a predetermined value. If the target SOC is negative, (The current SOC of the long-period ESS) + (the current SOC of the short-cycle ESS) if the current SOC of the long-period ESS is within the low-limit SOC, (Reference SOC of short cycle ESS).

If the current SOC of the long-term ESS is equal to or greater than the upper limit SOC, it is checked whether the current time is a predetermined discharge time. If the current time is not the discharge time, the target SOC is Target SOC = (standard SOC of long-term ESS).

If the current SOC of the long-term ESS is equal to or less than the lower-limit SOC, it is checked whether the current time is a predetermined charging time. If the current time is not the charging time, the target SOC is Target SOC = (standard SOC of long-term ESS).

The short-cycle ESS can be controlled by various renewable energy output stabilization algorithms.

In an embodiment of the present invention, the upper limit SOC may be set to 90%, the lower limit SOC may be set to 10%, and the upper limit SOC and the lower limit SOC may be set depending on characteristics of the battery.

According to the present invention, in the renewable energy storage system, the output fluctuation rate of the renewable energy is suppressed and the stable output is provided, so that the rapid change of the system can be prevented in advance.

In addition, according to the present invention, it is possible to minimize the capacity of the short-circuited battery installed for stabilizing the output and to install the long-term battery at a relatively low price, thereby facilitating business feasibility review through economical facility capacity estimation.

Further, according to the present invention, price competitiveness can be enhanced through utilization of a long-term energy storage system which is relatively inexpensive.

1 is a diagram illustrating a configuration of an energy storage system according to an embodiment of the present invention.
2 is a graph for explaining the stabilization control of the renewable energy of the short-cycle ESS according to an embodiment of the present invention.
3 is a diagram for explaining a control method of the long-term ESS according to an embodiment of the present invention.
4 and 5 are flowcharts illustrating a method of controlling the short-term periodic power output in the energy storage system according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted in an ideal or overly formal sense unless expressly defined in the present application Do not.

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The present invention relates to a system for storing renewable energy including wind power and solar heat and a method for controlling a short term periodic power output in an energy storage system including a short cycle ESS (Energy Storage System) and a long period ESS (Energy Storage System) will be.

4 and 5 are flowcharts illustrating a method of controlling the short-term periodic power output in the energy storage system according to an embodiment of the present invention.

Referring to FIG. 4, in the energy storage system according to an embodiment of the present invention, when the current state of charge (SOC) of the presently charged state of the long-period ESS is within the predetermined upper limit SOC and the lower limit SOC (S401) and controls the output of the long-period ESS according to the current SOC state of the short-period ESS.

Specifically, if the current state of charge of the short-period ESS is equal to or greater than the predetermined reference SOC of the short-period ESS (S403), the control unit 100 controls the long-period ESS to charge the battery (S407). If the current SOC of the short cycle ESS is equal to or less than the reference SOC of the short cycle ESS (S403), control is performed so that the long cycle ESS discharges (S409).

Next, if the current SOC of the long-period ESS is equal to or greater than the upper-limit SOC (S405), control is performed so that the long-term ESS discharges according to the predetermined discharge time (S411).

If the current SOC of the long-term ESS is equal to or less than the lower-limit SOC (S405), the long-term ESS is controlled to be charged according to the predetermined charging time (S413).

In one embodiment of the present invention, the upper limit SOC may be set to 90%, the lower limit SOC may be set to 10%, and the upper limit SOC and the lower limit SOC may be set depending on the characteristics of the battery.

Referring to FIG. 5, if the current SOC of the long-term ESS in the energy storage system according to the embodiment of the present invention is within the upper-limit SOC and the lower-limit SOC (S501), the target SOC = (the current SOC of the long- (SOC) - (reference SOC of the short cycle ESS) (S509).

If the current SOC of the long-period ESS is equal to or greater than the upper limit SOC (S503), it is checked whether the current time is a predetermined discharge time (S505). If the current time is not the discharge time, the target SOC is set to the current SOC of the long- (S515). If the current time is the discharge time, the command is set to the target SOC = (reference SOC of the long-term ESS) (S511).

If the current SOC of the long-period ESS is equal to or less than the lower limit SOC (S503), it is checked whether the current time is the predetermined charging time (S507). If the current time is not the charging time, the target SOC is set to the current SOC of the long- (S517). If the present time is the charging time, the command is set to the target SOC = (reference SOC of the long-term ESS) (S513).

Then, the charging or discharging output of the long-period ESS is controlled to the set target SOC (S519). Here, if the target SOC-current SOC is a positive value, charge is performed by the corresponding value, while if it is a negative value, discharge is performed by the corresponding value, and if the target SOC-

1 is a diagram illustrating a configuration of an energy storage system according to an embodiment of the present invention.

Referring to FIG. 1, the energy storage system of the present invention includes an EMS 110, a PCS 120, a battery 130 of a short cycle ESS, a PCS 120 of a short cycle ESS, (140), and a PCS (150) of a long period ESS.

The EMS 110 generally manages the output of renewable energy such as wind power and solar heat.

The PCS 120 controls the charging / discharging operation of the battery 130 in accordance with the command of the EMS 110. [

The PCS 140 controls the charging / discharging operation of the battery 150 in accordance with the command of the EMS 110.

In an embodiment of the present invention, the batteries 130 and 150 may be constructed of a lithium ion-lead hybrid battery to minimize the installation cost.

In one embodiment of the present invention, the short-period ESS may be controlled by a renewable energy output stabilization algorithm such as a smoothing algorithm, a ramp algorithm, etc., and the long-period ESS may be controlled by a REC Maximizing algorithm or the like.

In one embodiment of the present invention, the battery 130 of short-cycle ESS may be implemented as a lithium-ion battery.

In one embodiment of the present invention, the battery 150 of the long-term ESS may be implemented as a lead-acid battery.

2 is a graph for explaining the stabilization control of the renewable energy of the short-cycle ESS according to an embodiment of the present invention.

Referring to FIG. 2, the PCS 120 normally monitors the output of renewable energy. When the output fluctuation of the renewable energy is severe, the EMS 110 transmits a command to stabilize the renewable energy output to the PCS 120. The PCS 120, which receives the new / renewable energy output stabilization command, performs a renewable energy output stabilization operation and controls the charging or discharging of the battery 130.

3 is a diagram for explaining a control method of the long-term ESS according to an embodiment of the present invention.

Referring to FIG. 3, when the SOC of the short-cycle ESS is greater than the reference SOC during the monitoring of the SOC of the short-cycle ESS, the long-period ESS is charged. When the SOC of the short cycle ESS becomes equal to or lower than the reference SOC, control is performed so as to discharge the long cycle ESS.

When the SOC of the long-period ESS becomes equal to or higher than the upper limit SOC, the discharge is made at a predetermined time, and when the SOC of the long-period ESS becomes the lower limit SOC, the charge is controlled at a predetermined time.

While the present invention has been described with reference to several preferred embodiments, these embodiments are illustrative and not restrictive. It will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention and the scope of the appended claims.

110 EMS 120 PCS (short cycle ESS)
130 Battery (short cycle ESS) 140 PCS (long cycle ESS)
150 battery (long period ESS)

Claims (7)

  1. (EN) An energy storage system including a short cycle ESS (Energy Storage System) and a long cycle ESS (Energy Storage System) is a system for storing renewable energy including wind power and solar heat.
    Controlling an output of the long-period ESS according to a current SOC state of the short-cycle ESS if the current state of charge (SOC) of the long-period ESS is within a predetermined upper limit SOC and a lower limit SOC;
    Controlling the discharge of the long-period ESS according to a predetermined discharge time if the current SOC of the long-period ESS is equal to or higher than the upper limit SOC; And
    And controlling the long-period ESS to charge according to a predetermined charging time if the current SOC of the long-period ESS is equal to or lower than the lower-limit SOC,
    The energy storage system controls the charging or discharging output of the long-period ESS according to the target SOC. If the target SOC is a positive value, the energy storage system charges the target SOC to a predetermined value until the target SOC. If the value is negative, And if it is 0, the output of the long-period ESS is controlled so as to wait,
    (The current SOC of the short period ESS) + (the current SOC of the short cycle ESS) - (the standard SOC of the short cycle ESS) if the current SOC of the long period ESS is within the upper limit SOC and the lower limit SOC. A method for controlling short - term periodic output in a system.
  2. The method according to claim 1,
    Controlling the output of the long-period ESS according to a current SOC state of the short-
    Controlling the long-period ESS to charge if the current SOC that is the charged state of the short-period ESS is equal to or greater than a reference SOC of the predetermined short-cycle ESS; And
    And controlling the discharging of the long-period ESS when the current SOC of the short-period ESS is equal to or less than the reference SOC of the short-period ESS.
  3. delete
  4. The method according to claim 1,
    If the current SOC of the long-term ESS is equal to or greater than the upper limit SOC, it is checked whether the current time is a predetermined discharge time. If the current time is not the discharge time, the target SOC is And the target SOC = (the reference SOC of the long-period ESS).
  5. The method according to claim 1,
    If the current SOC of the long-term ESS is equal to or less than the lower-limit SOC, it is checked whether the current time is a predetermined charging time. If the current time is not the charging time, the target SOC is And the target SOC = (the reference SOC of the long-period ESS).
  6. The method according to claim 1,
    Wherein the output of the short period ESS is controlled by a renewable energy output stabilization algorithm.
  7. The method according to claim 1,
    Wherein the upper limit SOC and the lower limit SOC are set according to battery characteristics of the energy storage system.
KR1020140190336A 2014-12-26 2014-12-26 Method for controlling output of long period or short period in energy storage system KR101660513B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011234563A (en) * 2010-04-28 2011-11-17 Toshiba Corp Storage battery control system and storage battery control method
KR101293462B1 (en) 2012-02-23 2013-08-06 한국전력공사 Scheduling dispatch control apparatus for energy storage system and method thereof

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KR101249659B1 (en) * 2010-10-13 2013-04-04 엘에스산전 주식회사 System and Apparatus for Charge and Discharge of Electric Energy
KR20130003409A (en) * 2011-06-30 2013-01-09 현대중공업 주식회사 Power stabilizing system for renewable energy generation
JP5738212B2 (en) 2012-02-20 2015-06-17 三菱重工業株式会社 Power storage type power generation system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011234563A (en) * 2010-04-28 2011-11-17 Toshiba Corp Storage battery control system and storage battery control method
KR101293462B1 (en) 2012-02-23 2013-08-06 한국전력공사 Scheduling dispatch control apparatus for energy storage system and method thereof

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