KR101761034B1 - Apparatus for charging power conversation unit using single pre-charger, and energy storage system including the same - Google Patents
Apparatus for charging power conversation unit using single pre-charger, and energy storage system including the same Download PDFInfo
- Publication number
- KR101761034B1 KR101761034B1 KR1020150190762A KR20150190762A KR101761034B1 KR 101761034 B1 KR101761034 B1 KR 101761034B1 KR 1020150190762 A KR1020150190762 A KR 1020150190762A KR 20150190762 A KR20150190762 A KR 20150190762A KR 101761034 B1 KR101761034 B1 KR 101761034B1
- Authority
- KR
- South Korea
- Prior art keywords
- power conversion
- unit
- battery
- charging
- voltage
- Prior art date
Links
- 238000004146 energy storage Methods 0.000 title abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 187
- 238000000034 method Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims 2
- 239000003990 capacitor Substances 0.000 description 31
- 238000009499 grossing Methods 0.000 description 24
- 238000010586 diagram Methods 0.000 description 15
- 230000003750 conditioning effect Effects 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
-
- 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
-
- H02J7/022—
-
- H02J7/041—
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The energy storage system according to the present invention includes a battery regulator for controlling a plurality of battery units and a power regulator for controlling charge and discharge of the battery unit. The power regulator converts the voltage of the battery unit to provide the system with the voltage, A plurality of power conversion units for initially charging the plurality of power conversion units to prevent an inrush current for each of the plurality of power conversion units and a plurality of power conversion units in sequence for initial charging And a control unit for controlling the initial charging unit.
Description
To an energy storage system, and more particularly to a technique for initially charging a power conversion unit included in an energy storage system.
With the development of the industry, electric power demand is gradually increasing, and the gap between day and night, season, and day is widening.
Recently, many techniques for reducing the peak load by utilizing the surplus power of the system have been rapidly developed for this reason. One of these technologies is to store the surplus power of the system in a battery or to supply energy And an energy storage system (ESS).
The energy storage system stores the surplus power at night or the power generated from renewable energy sources such as wind and sunlight, and supplies the power stored in the battery to the system during a peak load or a system accident. This will stabilize the system power unstably fluctuating by the renewable energy source and achieve maximum load reduction and load leveling.
In particular, such an energy storage system can be used in electric vehicles as well as smart grids due to recent emergence of various renewable energy sources.
Typical energy storage systems include power conditioning systems and battery conditioning systems.
The Power Conditioning System (PCS) is stored in a battery unit (e.g., a battery module, a battery rack, or a battery rack group) included in a battery conditioning system (BCS) Power is supplied to the system using the energy that is supplied and the battery unit is charged by using power supplied from the system.
Such a power regulation system converts DC power supplied from the battery control system into AC power and supplies it to the system, converts the AC power supplied from the system into DC power and supplies it to the battery management device, And a power conversion unit (PCU) including a capacitor for performing the above operation.
In particular, since the voltage of the capacitor of the power regulation system must be pre-charged to prevent the inrush current from occurring when the battery regulation system is connected to the power regulation system, conventionally, The capacitor of the conversion unit was initially charged.
However, in the conventional energy storage system, since an initial charging circuit for initial charging of a capacitor is connected to each of a plurality of power conversion units, when an error occurs in a power regulation system including a plurality of power conversion units, There is a problem in that it takes a long time to resolve the error because it is necessary to perform a process of checking whether a problem has occurred and correct the error according to the result.
In addition, since the initial charging circuit is individually configured for each power conversion unit, if the number of power conversion units is increased, the number of initial charging circuits increases in proportion to the increase in the number of power conversion units.
The technology to be a background of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2012-0088064 (entitled: Battery Energy Storage System, Aug. 8, 2012).
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to prevent an inrush current by initially charging a plurality of power conversion units through a single initial charging unit.
In order to achieve the above object, an energy storage system according to the present invention includes a battery control unit for controlling a plurality of battery units and a power control unit for controlling charge / discharge of the battery unit, A plurality of power conversion units for supplying power to the plurality of power conversion units and for charging the battery units by converting voltages of the systems, an initial charging section for preventing inrush currents for each of the plurality of power conversion units by initially charging the plurality of power conversion units, And a control unit for controlling the initial charging unit so as to sequentially charge the conversion unit sequentially.
A power conversion unit charging apparatus using a single initial charging unit according to the present invention is characterized by comprising a battery module in which a plurality of batteries are connected, a battery rack in which a plurality of battery modules are connected in series or a battery rack group in which a plurality of battery racks are connected in parallel The battery unit is connected to the battery unit and discharges the battery unit to convert the DC voltage supplied from the battery unit into an AC voltage and provide the battery as a system. The AC voltage supplied from the system is converted into a DC voltage to charge the battery unit An initial charging unit for initially charging a plurality of power conversion units to prevent an inrush current for each of the plurality of power conversion units, and a control unit for controlling the initial charging unit so as to sequentially charge the plurality of power conversion units in sequence .
According to the present invention as described above, the following effects can be obtained.
According to the present invention, a plurality of power conversion units are sequentially and initially charged through a single initial charging unit without a separate initial charging unit for each power conversion unit included in the power regulation system, thereby reducing the manufacturing cost required for constructing the power regulation system have.
Further, according to the present invention, it is sufficient to repair or replace a single initial charging unit when an error occurs in initial charging for a plurality of power conversion units, so that it is possible to quickly respond to an error for initial charging.
Further, according to the present invention, since the initial charge is performed for a plurality of power conversion units through a single initial charging section, it is possible to charge the same voltage to each power conversion unit.
FIG. 1 is a block diagram schematically showing a network configuration to which an energy storage system according to an embodiment of the present invention is applied.
2 is a block diagram schematically illustrating the configuration of a power control system included in the energy storage system shown in FIG.
3 is a block diagram schematically showing the configuration of a plurality of power conversion unit charging apparatuses using the single initial charging unit shown in FIG.
FIG. 4 is a timing chart for initially charging a plurality of power conversion units sequentially through an initial charging unit according to an embodiment of the present invention; FIG.
5 is an equivalent circuit diagram of an initial charging unit and a power conversion unit for initial charging according to an embodiment of the present invention.
6 is a flowchart showing an initial charging method for a plurality of power conversion units according to an embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.
The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.
It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.
FIG. 1 is a block diagram schematically showing a network configuration to which an energy storage system according to an embodiment of the present invention is applied.
2 is a block diagram schematically illustrating the configuration of a power control system included in the energy storage system shown in FIG.
1, an energy management system (EMS) 10 is connected to a plurality of
In addition, the
The
1 and 2, the
The
In an embodiment of the present invention, the
For example, the
In an embodiment of the present invention, the
The
Hereinafter, the configuration of the
2, a
The
The
The plurality of power conversion units 330 convert AC to DC and provide the battery to the
In an embodiment of the present invention, the power conversion unit 330 may be connected 1: 1 with the
The plurality of power conversion units 330 described above are connected in series to the
The circuit breaker 332 serves to prevent an overcurrent from being introduced into the
The filter 334 serves to reduce the harmonics of the reduced AC voltage through the
The inverter 336 converts the AC voltage output from the filter 334 to a DC voltage or converts a DC voltage supplied from the
The smoothing capacitor 338 performs a role of smoothing the DC voltage input from the
The connection switch 339 electrically connects the
Referring again to FIG. 1, a
The
Hereinafter, the configuration of the
3 is a block diagram schematically showing the configuration of a plurality of power conversion unit charging apparatuses using the single initial charging unit shown in FIG.
3, a
The selection switches 341a and 341b are configured to turn on and off the connection between the
As described above, in the embodiment of the present invention, the alternating-current voltage of the
Particularly, in the embodiment of the present invention, the AC voltage or the DC voltage for initial charging the plurality of power conversion units 330 is not necessarily input from the
Hereinafter, it is assumed that the AC voltage is input from the
The
In FIG. 3, the
The
The charging switch 345 is provided to be connected to each of the plurality of power conversion units 330 so that the voltage of the
The
In this case, the predetermined order may be set by reflecting various factors such as the order of connecting the
In addition, the
However, since the present invention is not limited thereto, it is possible to separately provide a control unit for controlling the
In the embodiment of the present invention, in order to perform initial charging in the order of the first
To this end, the
Next, the
Subsequently, when the initial charging of the first
When the initial charging of the specific power conversion unit 330 is completed, the
At this time, in the embodiment of the present invention, the
That is, since the voltage charged in the smoothing capacitor 338 of the power conversion unit 330 may be different from the voltage of the
Therefore, in the embodiment of the present invention, by connecting the corresponding power conversion unit 330 and the
FIG. 4 is a timing chart for initially charging a plurality of power conversion units sequentially through an initial charging unit according to an embodiment of the present invention; FIG.
The uppermost graph in Fig. 4 shows that the
4 includes a start flag for turning on the charge switch 345 that the
4, the
At this time, the
The
As in the case of charging the first
The on-off control for initial charging and inrush current prevention is performed in the same manner for the third
4, the completion flag transmitted from the controller of the power conversion unit 330 to the
As shown in FIG. 4, in the embodiment of the present invention, the initial charging unit separately provided for each power conversion unit is deleted, and the plurality of power conversion units 330 are successively charged through the single
5 is an equivalent circuit diagram of an initial charging unit and a power conversion unit for initial charging according to an embodiment of the present invention.
Referring to FIG. 5, an equivalent circuit diagram of an initial charge circuit and a power conversion unit according to an embodiment of the present invention includes an RC circuit including a resistor and a capacitor. At this time, the resistance R means the initial charging resistance included in the
Referring to FIG. 5, the voltage charged in the smoothing capacitor 338 by the initial charging unit according to the embodiment of the present invention will be described.
When the switch is placed on A and the DC voltage (V) is connected in a state where no voltage is applied to the smoothing capacitor 338 of the equivalent circuit of FIG. 5, the closed circuit voltage is expressed by the following equation (1).
Then, the result of differentiating and summarizing Equation 1 with respect to time is as shown in Equation 2 below.
If the equation (2) is integrated with respect to the variables i and t, the current flowing in the equivalent circuit diagram is calculated by the following equation (3).
(Where A is the integral constant)
If t = 0 is substituted to calculate the integral constant, the integral constant can be obtained as shown in Equation (4) below.
Therefore, the voltage applied to the resistor R is expressed by the following equation (5).
The voltage applied to the smoothing capacitor 338 is calculated by subtracting the voltage applied to the resistor R from the total voltage V of the equivalent circuit diagram, and the result is as shown in Equation 6 below.
That is, the smoothing capacitor 338 of the plurality of power conversion units 330 can be charged with the above-described voltage by the
As described above, in the embodiment of the present invention, a separate
Conventionally, since a separate initial charging circuit is connected to each of a plurality of power conversion units, when an abnormality occurs in a power control system including a plurality of power conversion units, it is checked which initial charging circuit has a problem However, in the embodiment of the present invention, when an error occurs in the initial charge of the plurality of power conversion units 330, the power conversion unit 330 may be configured to correspond to the plurality of power conversion units 330 It is sufficient to repair or replace only the single
Hereinafter, a method of charging a power conversion unit using a single initial charging unit according to an embodiment of the present invention will be described with reference to FIG.
6 is a flowchart illustrating a method of charging a power conversion unit using a single initial charging unit according to an embodiment of the present invention. The initial charging method shown in FIG. 6 can be performed by an initial charging apparatus including the power conversion unit, the initial charging unit, and the control unit shown in FIG. 1 to FIG.
First, as shown in FIG. 6, the
That is, in the embodiment of the present invention, AC voltage is received from the
Particularly, since the
The
That is, in the embodiment of the present invention, the inrush current is prevented by initially charging the smoothing capacitor 338 included in the plurality of power conversion units 330. Since the capacitor can be charged by the direct current power source, Converts the AC voltage supplied from the system (400) through the rectifier (342) into a DC voltage.
Subsequently, a plurality of charging switches 345 connected to the plurality of power conversion units 330 are turned on and off to supply the voltage received from the
Specifically, the voltage supplied to the first
Then, it is determined whether or not the initial charge of the last-ranked
Particularly, in the embodiment of the present invention, the power conversion unit 330 is provided with a direct current for providing a direct current to the power conversion unit 330 for a predetermined period of time during the initial charge of the power conversion unit 330 The connection switch 339 is turned on to connect the power conversion unit 330 and the
That is, since the voltage charged in the smoothing capacitor 338 of the power conversion unit 330 may be different from the voltage of the
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, have. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.
10: Energy management system 20: Energy storage system
100: power management system 200: battery control system
300: power control system 310: switchgear
320: Transformer
330a, 330b, 330c, and 330d:
340: initial charging
342: rectifier 343: initial charging circuit
345a, 345b, 345c, 345d: charging switch 350:
Claims (14)
And a power regulator for controlling charge and discharge of the battery unit,
The power control unit includes:
A plurality of power conversion units for converting the voltage of the battery unit to provide the voltage to the system, and converting the voltage of the system to charge the battery unit;
An initial charging unit for initially charging the plurality of power conversion units to prevent an inrush current for each of the plurality of power conversion units; And
And a control unit for controlling the initial charging unit to sequentially charge the plurality of power conversion units,
When the first start flag for initial charging is turned on in the control unit, a first charge switch for connecting the initial charge circuit and the first power conversion unit is turned on in response to the first start flag, The first connection switch for connecting the first power conversion unit and the corresponding battery unit is turned on so that the first charging switch and the first connection switch are simultaneously turned on for a predetermined time period (S1).
The initial charging unit
The first charging switch; And
And a second charge switch connecting the initial charge circuit and a second power conversion unit of the plurality of power conversion units,
Wherein the first power conversion unit includes the first connection switch,
And the second power conversion unit includes a second connection switch for connecting the second power conversion unit to a corresponding battery unit.
Wherein the first connection switch is kept on even when the first charging switch is turned off.
And a power regulator for controlling charge and discharge of the battery unit,
The power control unit includes:
A plurality of power conversion units for converting the voltage of the battery unit to provide the voltage to the system, and converting the voltage of the system to charge the battery unit;
An initial charging unit for initially charging the plurality of power conversion units to prevent an inrush current for each of the plurality of power conversion units; And
And a control unit for controlling the initial charging unit to sequentially charge the plurality of power conversion units,
When the second start flag for initial charging is turned on in the control unit, in a state in which the first connection switch for connecting the first power conversion unit and the corresponding battery unit is on, The second charging switch for connecting the second power conversion unit is turned on and the second connection switch for connecting the second power conversion unit for turning off the second charging switch and the corresponding battery unit is turned on, And the second connection switch is simultaneously turned on for a predetermined time (S2).
Wherein the second connection switch is turned on even when the second charging switch is turned off so that the first connection switch and the second connection switch are simultaneously turned on.
Wherein the initial charging section includes a selection switch for turning on / off the connection with the system or the battery unit,
Wherein the initial charging unit is connected to one of the system or the battery unit according to an ON / OFF state of the selection switch to receive a voltage for initial charging.
Wherein the initial charging unit includes a rectifier for converting an AC voltage supplied from the system to a DC voltage and a DC voltage obtained by converting an AC voltage supplied from the system or a DC voltage supplied from the battery unit, And sequentially charges the plurality of power conversion units.
An initial charging unit for initially charging the plurality of power conversion units to prevent an inrush current for each of the plurality of power conversion units; And
And a control unit for controlling the initial charging unit to sequentially charge the plurality of power conversion units,
When the first start flag for initial charging is turned on in the control unit, a first charge switch for connecting the initial charge circuit and the first power conversion unit is turned on in response to the first start flag, Wherein a first connection switch for connecting the first power conversion unit and a corresponding battery unit is turned on so that the first charging switch and the first connection switch are simultaneously turned on for a predetermined time period (S1) Used power conversion unit charging device.
The initial charging unit
The first charging switch; And
And a second charge switch connecting the initial charge circuit and a second power conversion unit of the plurality of power conversion units,
Wherein the first power conversion unit includes the first connection switch,
Wherein the second power conversion unit includes a second connection switch for connecting the second power conversion unit to a corresponding battery unit.
Wherein the first connection switch is kept on even when the first charging switch is turned off.
An initial charging unit for initially charging the plurality of power conversion units to prevent an inrush current for each of the plurality of power conversion units; And
And a control unit for controlling the initial charging unit to sequentially charge the plurality of power conversion units,
When the second start flag for initial charging is turned on in the control unit, in a state in which the first connection switch for connecting the first power conversion unit and the corresponding battery unit is on, The second charging switch for connecting the second power conversion unit is turned on and the second connection switch for connecting the second power conversion unit for turning off the second charging switch and the corresponding battery unit is turned on, And the second connection switch is simultaneously turned on for a predetermined time (S2).
Wherein the second connection switch is turned on even when the second charging switch is turned off, so that the first connection switch and the second connection switch are simultaneously turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150190762A KR101761034B1 (en) | 2015-12-31 | 2015-12-31 | Apparatus for charging power conversation unit using single pre-charger, and energy storage system including the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150190762A KR101761034B1 (en) | 2015-12-31 | 2015-12-31 | Apparatus for charging power conversation unit using single pre-charger, and energy storage system including the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20170080917A KR20170080917A (en) | 2017-07-11 |
| KR101761034B1 true KR101761034B1 (en) | 2017-07-25 |
Family
ID=59355074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150190762A KR101761034B1 (en) | 2015-12-31 | 2015-12-31 | Apparatus for charging power conversation unit using single pre-charger, and energy storage system including the same |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101761034B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102361334B1 (en) * | 2018-05-09 | 2022-02-09 | 주식회사 엘지에너지솔루션 | Battery control apparatus, and energy storage system including the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011193633A (en) * | 2010-03-15 | 2011-09-29 | Daihen Corp | Power converter |
-
2015
- 2015-12-31 KR KR1020150190762A patent/KR101761034B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011193633A (en) * | 2010-03-15 | 2011-09-29 | Daihen Corp | Power converter |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20170080917A (en) | 2017-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9735619B2 (en) | Power conversion device | |
| KR101530821B1 (en) | Electrical storage device and electrical storage system | |
| EP3259152B1 (en) | Electric vehicle power distribution system | |
| US20180358839A1 (en) | Multi-Function Energy Station | |
| EP3176897B1 (en) | Power source system | |
| KR101412742B1 (en) | Stand-alone Microgrid Control System and Method | |
| US11073807B2 (en) | Method and apparatus for activation and de-activation of power conditioners in distributed resource island systems using low voltage AC | |
| KR101538232B1 (en) | Battery Conditioning System and Battery Energy Storage System Including That Battery Conditioning System | |
| WO2012128252A1 (en) | Power storage system | |
| EP3230117B1 (en) | Method and arrangement for charging of vehicle accumulators | |
| JP2015195674A (en) | Power storage battery assembly control system | |
| KR20200048913A (en) | Stand-alone household energy storage system based on waste battery | |
| KR101571954B1 (en) | Battery Energy Storage System Capable of Emergency Operation and Method for Emergency Operation of Battery Energy Storage System Under Error of Battery Rack | |
| KR101761034B1 (en) | Apparatus for charging power conversation unit using single pre-charger, and energy storage system including the same | |
| KR101856628B1 (en) | Apparatus and Method for Emergency Controlling Energy Storage System | |
| EP3687022A1 (en) | Energy storage system | |
| US10886744B2 (en) | Power conversion system, power supply system and power conversion device | |
| KR102022321B1 (en) | Energy storage system | |
| KR101782223B1 (en) | Apparatus for Diagnosing Battery Conditioning System, Energy Storage System including That Apparatus | |
| RU2414788C1 (en) | Multi-channel uninterrupted power supply of modular construction | |
| CN114503386A (en) | Method of operating a power generation system and power generation system using the method | |
| KR101167795B1 (en) | Power Conditioning System, Battery Energy Storage System, and Method for Charging Condenser of Power Conditioning System | |
| JP7314707B2 (en) | Electricity storage system and its control method | |
| US11762447B2 (en) | Power supply with boost stage to improve ride through performance | |
| JP7205127B2 (en) | DC power distribution system, control method for DC power distribution system, and power storage device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant |