KR101648804B1 - Energy storage system having a structure that a plurality of battery system is distributed and method for processing thereof - Google Patents

Energy storage system having a structure that a plurality of battery system is distributed and method for processing thereof Download PDF

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Publication number
KR101648804B1
KR101648804B1 KR1020160034513A KR20160034513A KR101648804B1 KR 101648804 B1 KR101648804 B1 KR 101648804B1 KR 1020160034513 A KR1020160034513 A KR 1020160034513A KR 20160034513 A KR20160034513 A KR 20160034513A KR 101648804 B1 KR101648804 B1 KR 101648804B1
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South Korea
Prior art keywords
power
battery
switch
supplied
load
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KR1020160034513A
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Korean (ko)
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김동진
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동도전력 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • B60L11/1814—
    • B60L11/1851—
    • B60L11/1855—
    • H02J3/382—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/30—AC to DC converters
    • B60L2230/30—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/60—Electric or hybrid propulsion means for production processes
    • Y02T10/7241—
    • Y02T90/127—
    • Y—GENERAL 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention relates to an energy storage system having a structure in which a plurality of battery systems are distributed and arranged, and a processing method thereof. The energy storage system includes a generator, a renewable energy source, a plurality of battery systems each supplying DC power to a DC load, a power regulation system and an energy management system. Each of the battery systems includes a battery charger and a battery, the batteries are interconnected in series with the batteries of an adjacent battery system, and the battery chargers are connected to the generator in parallel with each other. The energy storage system monitors the power supply status by interacting with the battery systems and the power control system, and supplies the DC power from the renewable energy source, the generator and the battery to the DC load according to the power supply status And selectively charges the battery. According to the present invention, by controlling the DC load drive and the battery charge / discharge in accordance with the power supply / demand state, efficient energy management can be performed and the emergency power failure state can be quickly coped with.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy storage system having a structure in which a plurality of battery systems are distributedly arranged,

[0001] The present invention relates to an energy storage system, and more particularly, to an energy storage system having a plurality of battery systems each of which supplies DC power to a DC load, To a DC load from at least one of a battery of a renewable energy source, a generator, and a battery system, or to selectively charge a battery, and a method of treating the same.

Currently, the global village is experiencing serious climate change due to the use of fossil fuels including petroleum, and restrictions on the use of fossil fuels are getting serious. As a result, companies are exploring new markets based on new technologies. The energy industry is creating new markets and industries such as renewable energy, energy management systems, virtual power plants and micro grids, and at the core is the Energy Storage System (ESS).

An energy storage system is a control system that increases the efficiency of energy use by storing and supplying power when needed. These energy storage systems can save power when electricity rates are low, and then use them at peak hours when electricity rates are high, which can lead to innovation in demand management. In addition, the use of energy storage system can stabilize the output of renewable energy such as solar and wind power, and can increase the efficiency of energy use. Thus, major energy powerhouses concentrate on the energy industry as a core growth engine.

Accordingly, energy storage systems are currently being developed in various ways, and prior arts using energy storage systems have already been widely disclosed. For example, the technology for an energy storage system is disclosed in Korean Patent Registration No. 10-1545060 (Aug. 17, 2015) entitled " ESS distributed control based smart grid integrated power control system ", Korean Patent Laid- -2016-0010789 (published on Jan. 28, 2016) discloses a method of economically feeding a microgrid based on renewable energy and an ESS using the same.

Korean Patent Registration No. 10-1545060 discloses a smart grid integrated power control system in which each household placed in a smart grid is grouped into a plurality of local energy storage system areas and integrated control of power received by each local energy storage system area And the energy storage system of Korean Patent Laid-Open Publication No. 10-2016-0010789 describes the prediction of the demand load and the power generation amount, and the scheduling of the supply of the renewable energy based on the predicted demand load and the power generation amount .

However, the above-described Korean Patent Registration No. 10-1545060, the Smart Grid integrated power control system, controls the power supply and demand for each of a plurality of local areas, so that the power consumption of the battery is large and it is difficult to separately manage the power flow of the load have.

The energy storage system disclosed in Korean Patent Laid-Open Publication No. 10-2016-0010789 has a problem in that it is difficult to control the power supply flow of the load in order to cope with an emergency situation by scheduling the power of the load by estimating the amount of power generation.

In addition, the above-described smart grid integrated power control system of Korean Patent Registration No. 10-1545060 and the energy storage system of Korean Patent Laid-Open Publication No. 10-2016-0010789 are commonly used for various types of power supply and load There is a problem in that there is no path for promptly coping with the power supply and demand situation.

Korean Patent Registration No. 10-1545060 (Published on Aug. 17, 2015) Korean Patent Publication No. 10-2016-0010789 (published January 28, 2016)

An object of the present invention is to provide an energy storage system having a structure in which a plurality of battery systems including a battery and a battery charger are distributed and arranged, and a method of processing the same.

Another object of the present invention is to provide an energy storage system for controlling a power flow supplied from a renewable energy source, a generator, and a battery to a DC load and a battery in response to a power supply state of various power sources and DC loads, .

It is still another object of the present invention to provide an energy storage system and a method of processing the energy storage system, a power control system, and an energy management system that are interworked with each other to manage power supply and demand.

In order to achieve the above objects, the energy storage system of the present invention has a plurality of battery systems, and each of the battery systems processes DC power to a DC load. The energy storage system of the present invention can supply power to the DC load or selectively charge the battery according to the power supply state of various power sources, the DC load, and the power demand state of the battery.

According to another aspect of the present invention, there is provided an energy storage system comprising a rechargeable battery and a battery charger for converting AC power into DC power to charge the battery, charging the battery with DC power supplied from a renewable energy source A plurality of battery systems in which the battery charger receives AC power supplied from a generator to supply DC power to a DC load and selectively charge the battery; A power regulating system that receives DC power from at least one of the renewable energy source and the battery, converts the AC power into AC power, and supplies AC power to the battery charger; The power regulating system and the battery system to monitor the power supply state of the renewable energy source, the generator and the battery system, the DC load, and the power demand state of the battery, And an energy management system for correspondingly controlling the power flow to the DC load and the battery.

In one embodiment of this aspect, the battery systems have a structure in which the batteries are connected in series and each of the battery chargers is connected to the generator in parallel.

In another embodiment, the energy storage system is provided at a first position on a first wiring line in which the generator and the battery system are connected in parallel, so that alternating current power supplied from the generator is input to the battery charger, A first switch for switching between the first and second switches; A second switch disposed between a second position on the first wiring to which the battery system and the first switch are connected and the power regulation system for switching the AC power supplied from the power regulation system to be input to the battery charger, ; A third switch provided between the battery charger and the battery for switching the DC power supplied from the battery charger to be input to the battery; The power control system is provided at a third position on the second wiring to which the batteries are connected in series and the power control system is connected to the power control system so that DC power supplied from the battery is input to the power regulation system, A fourth switch for switching DC power to be input to the battery; A fourth switch connected between the power control system and the fourth switch and a fourth position on the second wiring connected to the fourth switch and the renewable energy source to supply DC power supplied from the renewable energy source to the power control system and the battery Further comprising a fifth switch for switching the input to one of the inputs; The energy management system controls to switch each of the first to fifth switches corresponding to the power supply and demand state.

In another embodiment, the energy management system may be configured such that, when the power supply state is supplied only with AC power from the generator to the energy storage system and surplus electric power is used, the first switch and the third switch And turns off the second switch, the fourth switch and the fifth switch so that AC power of the generator is supplied to the DC load and the battery through the battery charger.

In another embodiment, the energy management system may be configured such that, if the power supply state is only AC power from the generator to the energy storage system and the DC load is a peak load, the first switch, The switch and the fourth switch are turned on and the third switch and the fifth switch are turned off so that the alternating current power converted from the direct current power of the battery and the alternating current power of the generator are supplied only to the direct current load through the battery charger Respectively.

In another embodiment, the energy management system may be configured such that the power supply state is a state in which the AC power of the generator and the DC power of the renewable energy source are supplied to the energy storage system, The first switch, the second switch, the third switch, and the fifth switch are turned on and the fourth switch is turned off when the current is lower than the DC power of the battery, And the AC power of the generator is supplied to the DC load and the battery through the battery charger.

In another embodiment, the energy management system may be configured such that the power supply status is such that the AC power of the generator and the DC power of the renewable energy source are supplied to the energy storage system and the DC power of the renewable energy source is rated The first switch, the second switch, the fourth switch, and the fifth switch are turned on and the third switch is turned off, so that the DC power of the battery And the AC power of the generator is supplied only to the DC load through the battery charger, and when the capacity of the power control system is exceeded, the fourth switch Off.

In another embodiment, the energy management system may be configured such that the power supply / demand state is such that only the DC power of the renewable energy source is supplied to the energy storage system, and the DC power of the renewable energy source is generated The fourth switch and the fifth switch are turned on and the first switch, the second switch and the third switch are turned off so that the direct current power of the renewable energy source Is supplied only to the battery.

In another embodiment, the energy management system may be configured such that, when the power supply state is not supplied with power from the generator and the renewable energy source to the energy storage system, and the DC load is a peak load, The switch and the fourth switch are turned on and the first switch, the third switch and the fifth switch are turned off so that the AC power converted from the DC power of the battery is supplied only to the DC load through the battery charger .

According to another aspect of the present invention, there is provided a method of processing an energy storage system having a plurality of battery systems, each of the battery systems causing DC power to be supplied to a DC load.

According to another aspect of the present invention, there is provided a method of processing an energy storage system of the present invention, the energy storage system including a rechargeable battery and a plurality of battery systems including a battery charger for converting AC power into DC power to charge the battery, A power regulating system for converting direct current power supplied from the renewable energy source and the battery to alternating current power; And an energy management system that is electrically connected to the power control system and the battery system to monitor a power supply state of the renewable energy source, the generator, the battery, and the DC load, In response to the status, And at least one of AC power converted by the power control system and AC power supplied from the generator is supplied to the battery charger to supply DC power to the DC load and selectively charge the battery.

In one embodiment of this aspect, if the power supply state is supplied only from the generator to the energy storage system, and AC power is used, AC power of the generator is transmitted to the DC load And to be supplied to the battery; The alternating current power converted from the direct current power of the battery and the alternating current power of the generator are supplied to the battery charger when the electric power supply state is supplied only from the alternator power to the energy storage system from the generator and the direct load is a peak load, To be supplied only to the DC load through the DC load; If the power supply state is the AC power of the generator and the DC power of the renewable energy source are supplied to the energy storage system and the DC power of the renewable energy source is lower than the DC power of the battery, The AC power converted from the DC power of the original and the AC power of the generator are supplied to the DC load and the battery through the battery charger; When the power supply and demand state is a state in which the AC power of the generator and the DC power of the renewable energy source are supplied to the energy storage system and the DC power of the renewable energy source is the rated capacity and the DC load is the peak load A DC power of the battery, an AC power converted from the DC power of the renewable energy source, and an AC power of the generator are supplied only to the DC load through the battery charger; If the power supply and demand state is such that only the DC power of the renewable energy source is supplied to the energy storage system and the DC power of the renewable energy source does not consume power of the DC load simultaneously with the rated capacity generation, The DC power of the energy source is supplied only to the battery; And if the power supply state is not supplied from the generator and the renewable energy source to the energy storage system and the DC load is a peak load, the AC power converted from the DC power of the battery is supplied to the battery charger To the DC load only.

As described above, the energy storage system of the present invention includes a plurality of battery systems, each of which supplies electric power to a DC load, so that DC power can be directly supplied to a small unit load such as an LED lighting, an electric vehicle charger or the like.

Also, the energy storage system of the present invention can supply power from various power sources to the DC load according to the power supply state through the switching control of the energy management system, thereby improving the energy efficiency.

In addition, the energy storage system of the present invention can maintain the uninterrupted state by receiving power from the batteries connected to the load in correspondence with the emergency power failure state.

In addition, the energy storage system of the present invention can be applied to various direct current loads by including a plurality of batteries connected in series, while maintaining the advantages of the existing energy storage system, and in particular, By using only DC power, the generation of electromagnetic waves is less than the AC power, so there is less harm to human body.

Further, the energy storage system of the present invention is economical because it does not need to have a power supply unit (Switched Mode Power Supply: SMPS), and it is possible to supply power in response to an emergency power failure state such as an uninterruptible power supply can do.

In addition, the energy storage system of the present invention can be applied to various places and facilities such as apartments, offices, factories, and street lamps due to the advantages described above.

FIG. 1 is a block diagram showing the configuration of an energy storage system having a structure in which a plurality of battery systems according to the present invention are distributedly arranged; FIG.
FIG. 2 is a block diagram showing a detailed configuration of the energy storage system shown in FIG. 1; FIG.
FIG. 3 is a block diagram showing a detailed configuration of the battery system shown in FIG. 2; FIG.
FIGS. 4A and 4B are flow charts showing the processing procedure of the energy storage system according to the present invention;
FIG. 5 is a flowchart showing the processing procedure of the surplus power use routine shown in FIGS. 4A and 4B; FIG.
FIG. 6 is a flowchart showing the processing procedure of the peak load routine shown in FIGS. 4A and 4B; FIG.
FIG. 7 is a flowchart showing a processing procedure of the low-capacity generation routine shown in FIGS. 4A and 4B; FIG.
FIG. 8 is a flow chart showing the processing procedure of the rated capacity generation and peak load routine shown in FIGS. 4A and 4B; FIG.
Fig. 9 is a flowchart showing the processing procedure of the rated capacity power generation and the light load reduction routine shown in Figs. 4A and 4B; Fig.
10 is a flowchart showing the processing procedure of the battery power use and peak load routine shown in Figs. 4A and 4B; Fig. And
11 is a flowchart showing the processing procedure of the battery charging completion routine shown in Figs. 4A and 4B.

The embodiments of the present invention can be modified into various forms and the scope of the present invention should not be interpreted as being limited by the embodiments described below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the components in the drawings are exaggerated in order to emphasize a clearer explanation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of an energy storage system having a structure in which a plurality of battery systems according to the present invention are distributedly arranged.

Referring to FIG. 1, an energy storage system (ESS) 100 according to the present invention includes a plurality of battery systems (BS) 150, The power supply state of the generator 110, the renewable energy source 120, the battery (154 in FIG. 3), and the DC load 160 using the energy management system 130 to supply power to the DC load 160 In real time. As a result of the monitoring, the energy management system 130 controls the power flow from the generator 110, the renewable energy source 120, and the battery 154 to the DC load 160 and the battery 154.

To this end, the energy storage system 100 of the present invention includes a power generator 110 and a renewable energy source 120. The energy storage system 100 also includes an energy management system (EMS) 130, a power conditioning system (PCS) 140, a plurality of battery systems 150, and a plurality of DC loads 160 ).

The energy storage system 100 according to the present invention is configured to be capable of operating in accordance with the power supply state of the generator 110, the renewable energy source 120 and the battery 154 and the power demand state of the DC load 160 and the battery 154 The power supply status can be discriminated and the power can be efficiently supplied or stored according to the discrimination result. Here, the power supply state is a state in which stable power is supplied from the generator 110, when surplus power is supplied from the generator 110, and when power is not supplied from the generator 110, The power demand state includes a case where a peak load of the DC load 160 is generated, and a case where the DC load 160 is supplied with power from the renewable energy source 120, A case where light load is generated, a case where charging of the battery 154 is required, and a case where charging of the battery 154 is completed, and the like.

The power supply source of the energy storage system 100 is selectively provided in the energy storage system 100 with the generator 110 and the renewable energy source 120.

The generator 110 receives AC power from, for example, a power plant, a substation, and the like, and supplies AC power to the battery system 150 through a distribution line or the like of the power system.

The renewable energy source 120 generates DC power from, for example, a solar panel, a wind turbine, and the like to supply DC power to the power control system 140 or the battery system 150.

The energy management system 130 is provided to be capable of mutual data communication with the power control system 140 and the battery system 150 via a network and is connected to the power generation system 110 and the renewable energy source 120, 154 and the DC load 160 are monitored.

The power control system 140 may include an inverter to receive DC power from the renewable energy source 120 and / or the battery 154, convert the DC power into AC power, and supply it to the battery system 150. The power conditioning system 140 is also connected to the energy management system 130 via a network.

The battery system 150 includes a battery charger 152 and a battery 154 to receive AC power from the power conditioning system 1140 and / or the generator 110 and convert it into DC power, (160) and selectively charges the battery (154). The battery system 150 is connected to the energy management system 130 via a network, like the power control system 140.

The DC load 160 is supplied with DC power from the battery system 150 and is driven.

The configuration and operation of the energy storage system of the present invention will be described in detail with reference to FIGS. 2 and 3. FIG.

That is, FIG. 2 is a block diagram showing a detailed configuration of the energy storage system shown in FIG. 1, and FIG. 3 is a block diagram showing a detailed configuration of a battery system of the energy storage system shown in FIG.

2 and 3, the energy storage system 100 of the present invention includes a generator 110, a renewable energy source 120, an energy management system 130, a power control system 140, A plurality of battery systems 150 and a plurality of DC loads 160. The energy storage system 100 also includes first to fifth switches S1 to S5.

Each of the battery systems 150 includes a battery charger 152 and a battery 154 and is coupled to a DC load 160. The batteries 154 are connected in series with the batteries 154 of each of the adjacent battery systems 150 and each of the battery chargers 152 is connected in parallel to the generator 110 . The battery chargers 152 and the batteries 154 are connected to the DC load 160 in parallel with each other. The battery charger 152 also converts the AC power supplied from the power regulation system 140 and / or the generator 110 to DC power to supply the DC power to the DC load 160, .

The energy storage system 100 uses the first to fifth switches S1 to S5 to supply electric power to the generator 110 and the renewable energy source 120, the battery 154 and the DC load 160 Controls the power flow according to the state.

The first switch S1 is provided at a first position on the first wiring where the generator 110 and the battery system 150 are connected in parallel. The first switch S1 is connected in parallel with the second switch S2 on the first wiring. The first switch S1 is controlled by the energy management system 130 to switch the AC power supplied from the generator 110 to be input to the battery charger 152. [

The second switch S2 is provided between the battery system 150 and the power regulation system 140 and the second position on the first wiring line to which the first switch S1 is connected. This second switch S2 under the control of the energy management system 130 switches the AC power supplied from the power regulation system 140 to be input to the battery charger 152.

The third switch S3 is provided between the battery charger 152 and the battery 154. [ The third switch S3 is controlled by the energy management system 130 to switch the DC power supplied from the battery charger 152 to be input to the battery 154. [

The fourth switch S4 is provided at a third position on the second wiring to which the power regulation system 130 is connected, and the batteries 154 connected in series. The fourth switch S4 is connected in parallel with the fifth switch S5 on the second wire. The fourth switch S4 is controlled by the energy management system 130 so that the DC power supplied from the battery 154 is input to the power regulation system 140 or the DC power supplied from the renewable energy source 120 To be input to the battery 154.

The fifth switch S5 is provided between the fourth position on the second wiring where the power control system 140 and the fourth switch S4 are connected and the renewable energy source 120. [ The fifth switch S5 switches under the control of the energy management system 130 so that the DC power supplied from the renewable energy source 120 is input to the battery 154 or the power regulation system 140.

As a result, the energy storage system 100 controls the first to fifth switches S1 to S5 to supply power from at least one of the generator 110, the renewable energy source 120, and the battery 154 to the battery charger 152 of the AC power supply.

Here, the battery 154 is provided as a rechargeable secondary battery. In this embodiment, the battery 154 has an output voltage of about 12 V, for example, a driving voltage of the DC load 160, and a voltage higher than about 12 V from the battery charger 152 or the renewable energy source 120 And is charged.

The energy storage system 100 may be installed in, for example, a home, a building, a factory, a streetlight, and the like. For example, when the energy storage system 100 is installed in an electric vehicle charging station, This is possible. For example, if the number of the battery systems 150 including the batteries 154 of each 12 V is 40, a maximum voltage of 480 V can be obtained, and the electric vehicle can be rapidly charged.

A method of processing an energy storage system according to an embodiment of the present invention will be described in detail with reference to FIGS. 4A to 11. FIG.

4A and 4B are flowcharts showing the processing procedure of the energy storage system according to the present invention, FIG. 5 is a flowchart showing the processing procedure of the redundant power use routine shown in FIGS. 4A and 4B, Fig. 7 is a flow chart showing the processing procedure of the low-capacity generation routine shown in Figs. 4A and 4B, Fig. 8 is a flowchart showing the processing flow of the peak capacity generation routine shown in Figs. 4A and 4B, Fig. 9 is a flow chart showing the processing procedure of the peak load routine, Fig. 9 is a flowchart showing the processing procedure of the rated capacity power generation and light load reduction routine shown in Figs. 4A and 4B, Fig. FIG. 11 is a flowchart showing the processing procedure of the battery charging completion routine shown in FIGS. 4A and 4B.

These procedures are processed by a control program that is processed by the energy storage system 100 of the present invention, and the control program is stored in the energy management system 130. This control program is processed by the power control system 140, the battery system 150, and the energy management system 130 interoperatively.

4A and 4B, the energy storage system 100 of the present invention is configured such that the energy management system 130 receives AC power from the generator 110 to determine whether the generator 110 is used in step S202. Is monitored. As a result of the monitoring, if the generator 110 is used, the procedure goes to step S204; otherwise, the procedure goes to step S222.

The energy management system 130 receives power from the renewable energy source 120 to either the power regulation system 140 or the battery system 150 in order to determine whether the renewable energy source 120 is used in step S204. Lt; / RTI > As a result of the monitoring, if the renewable energy source 120 is used, the procedure goes to step S214, and if not, the procedure goes to step S206.

In step S206, the energy management system 130 determines whether the surplus power of the generator 110 is used. That is, when the generator 110 is used and the renewable energy source 120 is not used, if the surplus power of the generator 110, for example, the nighttime power, or the like is used, the process proceeds to step S208, ).

5, the energy management system 130 turns on the first switch S1 and the third switch S3 in step S300, and the energy management system 130 turns on the second switch S1 S2, the fourth switch S4 and the fifth switch S5 are turned off. After the switching operation, AC power of the generator 110 is supplied to the battery charger 152 in step S302, and then, in step S304, the energy storage system 100 drives the DC load 160 and the battery 154 as shown in FIG. When the surplus power use routine S208 is completed, this procedure goes to step S202. This surplus power use routine S208 supplies the DC power to the DC load 160 and the battery 154 using the surplus power of the generator.

Referring again to FIGS. 4A and 4B, if surplus power of the generator 110 is not used in step S206, the procedure goes to step S210 to determine whether the DC load 160 is a peak load. That is, if the surplus electric power of the generator 110 is not used and the load is a peak load, the process proceeds to step S212 to process the peak load routine S212. Otherwise, the procedure proceeds to step S202.

6, the peak load routine S212 turns on the first switch S1 and the second switch S2 and the fourth switch S4 in step S310, , And turns off the third switch S3 and the fifth switch S5. The DC power of the battery 154 is supplied to the battery charger 152 via the power regulation system 140 and the AC power of the generator 110 is supplied to the battery charger 152. [ Subsequently, in step S314, the energy storage system 100 is supplied with DC power through the battery charger 152 to the DC load 160. When the peak load routine S212 is completed, this procedure goes to step S202. The peak load routine S212 uses the battery 110 and the battery 154 to generate a direct current load 160 when the generator 110 is used and the peak load when the renewable energy source 120 is not used DC power is supplied.

4A and 4B, if the renewable energy source 120 is used in step S204, the procedure goes to step S214 to determine whether the renewable energy source 130 is low capacity generation. That is, when the power of the generator 110 is used and the renewable energy source 120 supplies a low-capacity power that can not charge the battery 154, the flow advances to step S216 to process the low-capacity power generation routine S216 .

The low-capacity generation routine S216 is performed in such a manner that in step S330, the energy management system 130 determines that the first switch S1, the second switch S2, the third switch S3, and the fifth switch S5 are turned on and the fourth switch S4 is turned off. The DC power of the renewable energy source 120 is supplied to the battery charger 152 through the power regulation system 140 and the AC power of the generator 110 is supplied to the battery charger 152 do. Subsequently, in step S334, the energy storage system 100 supplies the DC power to the DC load 160 and the battery 154 through the battery charger 152. [ When the low-capacity generation routine S216 is completed, this procedure goes to step S202. The low-capacity generation routine S216 is processed when the power generation capacity of the renewable energy source 120 can not charge the battery 154. [

Referring again to FIGS. 4A and 4B, if the low-capacity power generation does not occur in step S214, the process proceeds to step S218 to determine whether it is the rated capacity power generation and the peak load. In other words, if the renewable energy source 120 is generated at the rated capacity and at the same time the DC load 160 is a peak load, the process proceeds to step S220 to process the rated capacity generation and peak load routine S220, The process proceeds to step S202.

The rated capacity generation and peak load routine S220 is performed in such a manner that in step S350 the energy management system 130 determines whether the first switch S1, the second switch S2, the fourth switch S4, The fifth switch S5 is turned on and the third switch S3 is turned off. After the switching operation, it is determined in step S352 whether the processing capacity of the power control system 140 is exceeded. If the processing capacity of the power regulation system 140 is not exceeded, then the procedure proceeds to step S356 where the DC power of the battery 154 and the renewable energy source 120 is supplied to the battery charger 152, and the AC power of the generator 110 is supplied to the battery charger 152. Subsequently, in step S358, the energy storage system 100 is supplied with DC power through the battery charger 152 to the DC load 160. On the other hand, if the processing capacity of the power regulation system 140 is exceeded in step S352, the process advances to step S354 to turn off only the fourth switch S4 so that the DC power supplied from the battery 154 to the power regulation system 140 And then sequentially proceeds from step S356 to step S360. When this rated capacity generation and peak load routine S220 is completed, this procedure goes to step S202.

4A and 4B, if the renewable energy source 120 is used in step S222, the procedure goes to step S224 to determine whether the energy management system 130 is under rated capacity generation and light load . That is, if the renewable energy source 120 is rated-rated and the DC load 160 is not consumed at the same time while using the renewable energy source 120 without using the generator 110, The routine proceeds to the rated capacity generation and light load routine S226, otherwise the procedure proceeds to step S202.

The rated capacity power generation and light load routine S226 is performed in such a manner that the energy management system 130 turns on the fourth switch S4 and the fifth switch S5 in step S370, 1 switch S1, the second switch S2 and the third switch S3 are turned off. After the switching operation, the DC power of the renewable energy source 120 is supplied to the battery 154 in step S372. When the rated capacity generation and light load routine S226 is completed, this procedure goes to step S202. This rated capacity power generation and light load routine S226 charges the battery 154 using the renewable energy source 120. [

4A and 4B, if the renewable energy source 120 is not used in step S222, the procedure proceeds to step S228 where the energy management system 130 determines whether the battery 154 power usage and peak load . That is, if the power consumption of the DC load 160 is a peak load while the power of the battery 154 is used without using the generator 110 and the renewable energy source 120, the process proceeds to step S230, 154) power usage and peak load routine (S230).

The battery power usage and peak load routine S230 is performed in such a manner that the energy management system 130 turns on the second switch S2 and the fourth switch S4 in step S380, 1 switch S1, the third switch S3 and the fifth switch S5 are turned off. After the switching operation, in step S382, the DC power of the battery 154 is supplied to the battery charger 152 through the power regulation system 154. [ Subsequently, in step S384, the energy storage system 100 supplies DC power to the DC load 160 through the battery charger 152. [ When this battery 154 power use and peak load routine S230 is processed, this procedure goes to step S202.

4A and 4B, if the power of the battery 154 is not used and the peak load is not determined in step S228, the procedure goes to step S232 to determine whether the battery 154 has been charged. That is, if the charging of the battery 154 is completed without using the battery 154 power and the peak load is not completed, the process proceeds to step S234 to process the battery 154 charging completion routine S234, The process proceeds to step S202.

The battery charge completion routine S234 turns off the third switch S3 in step S390 and the energy storage system 100 turns off the third switch S3 in step S392, (154). When this battery charging completion routine (S234) is completed, this procedure goes to step S202.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Various changes and modifications can be made without departing from the scope of the present invention.

100: Energy storage system
110: generator
120: New and renewable energy sources
130: Energy management system
140: Power regulation system
150: Battery system
152: Battery charger
154: Battery
160: DC load

Claims (11)

An energy storage system comprising:
And a battery charger for charging the battery by converting AC power into direct current power by charging the battery with direct current power supplied from a renewable energy source or by charging the battery charger with AC power supplied from a generator A plurality of battery systems (BS) for receiving and charging DC power to a DC load and selectively charging the batteries;
A power conditioning system (PCS) that receives DC power from at least one of the renewable energy source and the battery, converts the DC power into AC power, and supplies AC power to the battery charger;
The power regulating system and the battery system to monitor the power supply state of the renewable energy source, the generator and the battery system, the DC load, and the power demand state of the battery, An energy management system (EMS) for controlling power flow to the DC load and the battery in response to a power supply state including the power demand state;
A first switch provided at a first position on a first wiring line in which the generator and the battery system are connected in parallel, the first switch switching the AC power supplied from the generator to be input to the battery charger;
A second switch disposed between a second position on the first wiring to which the battery system and the first switch are connected and the power regulation system for switching the AC power supplied from the power regulation system to be input to the battery charger, ;
A third switch provided between the battery charger and the battery for switching the DC power supplied from the battery charger to be input to the battery;
The power control system is provided at a third position on the second wiring to which the batteries are connected in series and the power control system is connected to the power control system so that DC power supplied from the battery is input to the power regulation system, A fourth switch for switching DC power to be input to the battery; And
A fourth switch connected between the power control system and the fourth switch and a fourth position on the second wiring connected to the fourth switch and the renewable energy source to supply DC power supplied from the renewable energy source to the power control system and the battery And a fifth switch for switching the input to be input to either one,
The battery systems have a structure in which the batteries are connected in series and each of the battery chargers is connected in parallel to the generator,
Wherein the energy management system controls to switch each of the first to the fifth switches corresponding to the power supply and demand state.
delete delete The method according to claim 1,
The energy management system comprising:
The first switch and the third switch are turned on if the power supply and demand state is such that only AC power is supplied from the generator to the energy storage system and surplus electric power is used, And turns off the fifth switch so that AC power of the generator is supplied to the DC load and the battery through the battery charger.
The method according to claim 1,
The energy management system comprising:
The first switch, the second switch and the fourth switch are turned on if the power supply and demand state is only AC power supplied from the generator to the energy storage system and the DC load is a peak load, The switch and the fifth switch are turned off so that the alternating current power converted from the direct current power of the battery and the alternating current power of the generator are supplied only to the direct current load through the battery charger.
The method according to claim 1,
The energy management system comprising:
When the AC power of the generator and the DC power of the renewable energy source are supplied to the energy storage system and the DC power of the renewable energy source is lower than the DC power of the battery, , The second switch, the third switch and the fifth switch are turned on and the fourth switch is turned off so that alternating current power converted from direct current power of the renewable energy source and alternating current power of the generator are supplied to the battery charger And to supply the DC load and the battery to the battery.
The method according to claim 1,
The energy management system comprising:
When the power supply and demand state is a state in which the AC power of the generator and the DC power of the renewable energy source are supplied to the energy storage system and the DC power of the renewable energy source is the rated capacity and the DC load is the peak load , The first switch, the second switch, the fourth switch and the fifth switch are turned on, the third switch is turned off, and the AC power converted from the DC power of the battery and the DC power of the renewable energy source Power and AC power of the generator are supplied only to the DC load through the battery charger, and when the capacity of the power regulation system is exceeded, the fourth switch is turned off.
The method according to claim 1,
The energy management system comprising:
If the power supply and demand state is such that only the direct current power of the renewable energy source is supplied to the energy storage system and the direct current power of the renewable energy source does not consume the direct current power of the direct current load simultaneously with the rated capacity power generation, 4 switch and the fifth switch are turned on and the first switch, the second switch and the third switch are turned off so that the DC power of the renewable energy source is supplied only to the battery Storage system.
The method according to claim 1,
The energy management system comprising:
The second switch and the fourth switch are turned on if the power supply and demand state is not supplied with power from the generator and the renewable energy source to the energy storage system and the DC load is a peak load, Switches off the third switch and the fifth switch so that the AC power converted from the DC power of the battery is supplied only to the DC load through the battery charger.
A method of processing an energy storage system comprising:
The energy storage system includes a rechargeable battery and a battery charger that converts AC power into DC power to charge the battery. The battery charger charges the battery with DC power supplied from a renewable energy source, A plurality of battery systems for receiving AC power to supply DC power to the DC load and selectively charging the battery, the generator for supplying AC power to the battery system, and a generator for supplying AC power to the battery system A power regulating system for converting the direct current power supplied from the battery into the alternating current power, and a power regulating system for electrically connecting the power regulating system and the battery system to the renewable energy source , remind And an energy management system for monitoring a power supply state of the battery, the battery, and the DC load, wherein the energy management system includes: AC power converted by the power control system in response to the power supply state; To the battery charger to supply DC power to the DC load, and to selectively charge the battery;
The above-
The alternating current power of the generator is supplied to the direct current load and the battery through the battery charger if the power supply state is supplied only from the generator to the energy storage system and only surplus electric power is used;
The alternating current power converted from the direct current power of the battery and the alternating current power of the generator are supplied to the battery charger when the electric power supply state is supplied only from the alternator power to the energy storage system from the generator and the direct load is a peak load, To be supplied only to the DC load through the DC load;
If the power supply state is the AC power of the generator and the DC power of the renewable energy source are supplied to the energy storage system and the DC power of the renewable energy source is lower than the DC power of the battery, The AC power converted from the DC power of the original and the AC power of the generator are supplied to the DC load and the battery through the battery charger;
When the power supply and demand state is a state in which the AC power of the generator and the DC power of the renewable energy source are supplied to the energy storage system and the DC power of the renewable energy source is the rated capacity and the DC load is the peak load A DC power of the battery, an AC power converted from the DC power of the renewable energy source, and an AC power of the generator are supplied only to the DC load through the battery charger;
If the power supply and demand state is such that only the DC power of the renewable energy source is supplied to the energy storage system and the DC power of the renewable energy source does not consume power of the DC load simultaneously with the rated capacity generation, The DC power of the energy source is supplied only to the battery; And
If the power supply state is not supplied with power from the generator and the renewable energy source to the energy storage system and the DC load is a peak load, the AC power converted from the DC power of the battery is supplied to the battery charger So that only the DC load is supplied to the DC load.
delete
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KR20210076592A (en) 2019-12-16 2021-06-24 박형곤 Power supply system using circular discharging of multi battery

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KR101545060B1 (en) 2013-11-26 2015-08-17 정유철 Integrate Electric Energy Control System Based On ESS Distributed Control
KR20160010789A (en) 2014-07-18 2016-01-28 전자부품연구원 Economic Electrical Power Supply Method for Micro Grid based on New Renewable Energy and ESS using the same

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KR20090036751A (en) * 2007-10-10 2009-04-15 주식회사 씨엠파트너 Hybrid ups system for controlling maximum demand power
KR101545060B1 (en) 2013-11-26 2015-08-17 정유철 Integrate Electric Energy Control System Based On ESS Distributed Control
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* Cited by examiner, † Cited by third party
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CN107591576A (en) * 2017-09-02 2018-01-16 合肥敏喆信息科技有限公司 A kind of two-stage distributed management system of mining battery pack
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