KR20170057648A - Apparatus and method for designing of specification of energy storage system - Google Patents

Apparatus and method for designing of specification of energy storage system Download PDF

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KR20170057648A
KR20170057648A KR1020150161003A KR20150161003A KR20170057648A KR 20170057648 A KR20170057648 A KR 20170057648A KR 1020150161003 A KR1020150161003 A KR 1020150161003A KR 20150161003 A KR20150161003 A KR 20150161003A KR 20170057648 A KR20170057648 A KR 20170057648A
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output
battery rack
pcs
ess
battery
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KR102030872B1 (en
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오경진
조영보
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주식회사 엘지화학
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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
    • G01R31/3679—
    • G01R31/3693—

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

Abstract

The present invention relates to a device and a method to design a specification of an energy storage system (ESS), and specifically, relates to a device and a method to design a specification of an ESS, setting output of a power conversion system (PCS) to satisfy required output of the ESS in accordance with the number of battery racks, sequentially setting a discharge rate, an available capacity, and a discharging time of the battery rack in accordance with the set output of the PCS, and determining a specification of the ESS after determining whether or not the output and the discharging time of the PCS satisfies the required specification of the ESS, in order to design the specification of the ESS in response to the required specification of the ESS having the PCS installed in each of the battery racks connected in parallel. According to the present invention, the device comprises a number setting unit, an output setting unit, an available capacity calculation unit, a discharge time calculation unit, a determination unit, and a specification determination unit.

Description

TECHNICAL FIELD The present invention relates to an apparatus and a method for designing an energy storage system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for designing an energy storage system, and more particularly, to an energy storage system (hereinafter referred to simply as an energy storage system) having a power conversion system (PCS) In order to design the specification of ESS in accordance with the requirements of the Energy Storage System (ESS), we set the output of the PCS to satisfy the required output of the ESS according to the number of battery racks, set the discharge rate of the battery rack according to the set PCS output, And determining the specifications of the ESS after determining whether the output and discharge time of the PCS satisfy the requirements of the ESS.

Generally, an energy storage system (ESS) installed in a power plant for driving a large-scale power grid or a building with a large power consumption is composed of a plurality of batteries. More specifically, the battery of the ESS can be constituted of a plurality of battery racks, in which a plurality of battery modules are generally composed of a plurality of battery modules. As a result, a large number of batteries can be assembled in a special space such as an air- Can be installed. At this time, a battery management system (BMS) is installed in a plurality of battery racks to monitor and control the control objects such as voltage, current, temperature, and breaker.

Meanwhile, the power conversion system (PCS) is installed in the ESS to control the charge and discharge of the battery by controlling the power supplied to the external rotor and the power supplied from the battery rack to the outside, and the energy management system (Enery Management System (EMS) controls the output of the PCS based on the above-mentioned monitoring and control results of the BMS.

FIG. 1 shows a connection between a battery rack and a PCS of a conventional ESS.

1 and 2, the PSC 6 may be individually connected to the ESS 1 or the battery rack 5 connected in parallel, where the battery rack 2 connected in parallel is connected to one PCS 3, There is an ESS (4) to be connected, and the specification design method of the ESS must be different in correspondence with the ESS's battery rack and PCS connection configuration.

More specifically, in the specification design method of the ESS 1 having the configuration in which the battery rack 2 connected in parallel is connected to one PCS 3, the output of the PCS 3 is supplied to the required output of the ESS 1 And the capacity and the number of the battery racks 2 are changed to design the specification of the ESS 1.

However, in the case of the ESS 4 having a configuration in which the PSCs 6 are individually connected to the battery racks 5 connected in parallel, the output of the PCS 6 connected to each battery rack 5 is supplied to the ESS 4 The capacity of each battery rack 5 is fixed and the initial capacity according to the requirement of the ESS 4 can not be calculated.

In order to solve the above-described problems, the inventor of the present invention has found that, in order to design the specifications of the ESS corresponding to the requirements of the ESS having the power conversion systems individually provided in the battery racks connected in parallel, The output of the PCS is set so as to satisfy the required output, and the discharge rate, the usable capacity and the discharge time of the battery rack corresponding to the set PCS output are sequentially calculated, and it is determined whether or not the output and discharge time of the PCS satisfy the requirements of the ESS The inventors of the present invention have invented a design apparatus and method for designing an energy storage system that determines the specifications of an ESS.

Korean Patent Publication No. 10-2011-0084751

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a method and apparatus for setting an output of a PCS so as to satisfy a required output of an ESS according to the number of battery racks, The available capacity and the discharging time are sequentially calculated. After determining whether the output and discharging time of the PCS satisfy the requirements of the ESS, the specifications of the ESS are determined. Thus, the ESS Which is capable of designing the specifications of the ESS in accordance with the requirements of the present invention.

An apparatus for designing an energy storage system (ESS) in which a power conversion system (PCS) is separately provided in each of battery racks connected in parallel, according to an embodiment of the present invention. A specification designing device of the energy storage system includes a number setting unit for setting the number of the battery racks; An output setting unit for setting an output of the PCS such that the output of the PCS satisfies a required output of the ESS according to the number of the battery racks; A usable capacity calculating unit for calculating a usable capacity of the battery rack by using a discharge rate of the battery rack according to an output of the PCS; A discharge time calculating unit for calculating a discharge time of the battery rack; A determination unit for determining whether the output of the PCS and the discharge time of the battery rack satisfy the required output and power supply time of the ESS, respectively; And a specification determination unit determining the number of the battery racks and the output of the PCS as the specification of the ESS corresponding to the result of the determination unit.

The apparatus for designing a specification of the energy storage system may further include a requirement setting unit for setting a requirement specification of the ESS.

The requirement specification of the ESS may include a required output and a power supply time of the ESS.

The output setting unit may calculate the output of the PCS using the following equation.

≪ Equation &

Figure pat00001

 Here, Pp = output of PCS

Ep = required output of ESS

Pn = number of PCS = Bn = number of battery racks

Wherein the available capacity calculating unit calculates a ratio between the output of the PCS and the capacity of the battery rack as a discharge rate of the battery rack and calculates a usable capacity of the battery rack using mapping capacity constants mapped to a discharge rate of the battery rack. The capacity can be calculated.

The capacity correction constant may include an available capacity ratio, a lifetime factor, and a loss factor.

The available capacity calculating unit may calculate the discharge rate of the battery rack and the available capacity of the battery rack using the following equation.

≪ Equation &

Figure pat00002

Where C = discharge rate of the battery rack

P p = output of PCS

B c = Capacity of battery rack

B ac = Available capacity of battery rack

R ac = available capacity ratio

F life = lifetime factor

F loss = loss factor

The discharge time calculating unit may calculate the discharge time of the battery rack using the following equation.

≪ Equation &

Figure pat00003

Where B t = discharge time of the battery rack

B ac = Available capacity of battery rack

P p = output of PCS

The determination unit may determine whether the discharge rate of the battery rack is equal to or less than an allowable discharge rate.

Wherein the number setting unit sets the number of times that the output of the PCS and the discharge time of the battery rack do not satisfy either the required output or the power supply time of the ESS as a result of the determination unit or the discharge rate of the battery rack exceeds the allowable discharge rate The number of the battery racks can be increased or decreased and reset.

Wherein the specification determining unit determines that the output of the PCS and the discharging time of the battery rack satisfy the required output and the power supply time of the ESS as a result of the determination by the determining unit and the discharge rate of the battery rack is equal to or less than the allowable discharge rate, The number of racks and the output of the PCS can be determined by the specification of the ESS.

In a specification design method of an ESS in which PCSs are individually provided in each of parallel-connected battery racks, a method of designing an energy storage system according to an embodiment of the present invention includes: setting a number of battery racks; Setting the output of the PCS such that the output setting unit satisfies the required output of the ESS according to the number of the battery racks; Calculating a usable capacity of the battery rack using the discharge rate of the battery rack according to the output of the PCS; Calculating a discharge time of the battery rack by a discharge time calculating unit; Determining whether the output of the PCS and the discharge time of the battery rack satisfy the required output and power supply time of the ESS, respectively; And determining the number of the battery racks and the output of the PCS as the specification of the ESS corresponding to the result of the determination unit.

The method of designing a specification of the energy storage system may further include a step of the requirement setting unit setting a requirement specification of the ESS.

The requirement specification of the ESS may include a required output and a power supply time of the ESS.

The method for designing the energy storage system may further include the step of the output setting unit calculating an output of the PCS using the following equation.

≪ Equation &

Figure pat00004

Here, Pp = output of PCS

Ep = required output of ESS

Pn = number of PCS = Bn = number of battery racks

Wherein the available capacity calculating unit calculates a ratio between the output of the PCS and the capacity of the battery rack as a discharge rate of the battery rack and uses a capacity correction constant mapped to the discharge rate of the battery rack And calculating a usable capacity of the battery rack.

The capacity correction constant may include an available capacity ratio, a lifetime factor, and a loss factor.

The method of designing the energy storage system may further include calculating the discharge rate of the battery rack and the usable capacity of the battery rack using the available capacity calculating part.

≪ Equation &

Figure pat00005

Where C = discharge rate of the battery rack

P p = output of PCS

B c = Capacity of battery rack

B ac = Available capacity of battery rack

R ac = available capacity ratio

F life = lifetime factor

F loss = loss factor

The method of designing the energy storage system may further include calculating the discharge time of the battery rack using the discharge time calculating unit using the following equation.

≪ Equation &

Figure pat00006

Where B t = discharge time of the battery rack

B ac = Available capacity of battery rack

P p = output of PCS

The method of designing the energy storage system may further include determining whether the discharge rate of the battery rack is equal to or less than an allowable discharge rate.

The method of designing an energy storage system according to claim 1, wherein the number setting unit determines that the output of the PCS and the discharge time of the battery rack do not satisfy either the required output of the ESS or the power supply time, And increasing / decreasing the number of the battery racks when the discharge rate of the battery rack exceeds the allowable discharge rate.

The specification designing method of the energy storage system is characterized in that the specification designing unit determines that the output of the PCS and the discharge time of the battery rack satisfy the required output and power supply time of the ESS, And designing the number of the battery racks and the output of the PCS to the specification of the ESS when the allowable discharge rate is not more than the allowable discharge rate.

An apparatus and method for designing a specification of an energy storage system according to an embodiment of the present invention calculates an available capacity of the battery rack using a discharge rate of the battery rack according to an output of a power conversion system (PCS) , And the output of the PCS can be set so as to satisfy the required output of the energy storage system (ESS) precisely.

Further, according to the present invention, when the discharge rate of the battery rack is equal to or less than the allowable discharge rate, the number of the battery racks and the output of the PCS are determined as the specification of the ESS, thereby improving the life and safety of the battery rack provided in the ESS .

FIG. 1 shows a connection between a battery rack and a power conversion system of a conventional energy storage system.
3 is a block diagram showing the configuration of an apparatus for designing a specification of an energy storage system according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating a procedure of a specification design method of an energy storage system according to an embodiment of the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Further, the term "part" in the description means a unit for processing one or more functions or operations, which may be implemented by hardware, software, or a combination of hardware and software.

3 is a block diagram showing a configuration of an apparatus 100 for designing a specification of an energy storage system according to an embodiment of the present invention.

3, the apparatus 100 for designing a specification of an energy storage system includes a requirement setting unit 110, a number setting unit 120, an output setting unit 130, a usable capacity calculating unit 140, A determination unit 160, and a specification determination unit 170. [0034] The specification design apparatus 100 of the energy storage system shown in FIG. 3 is according to one embodiment, and its components are not limited to the embodiment shown in FIG. 3, and may be added, have.

The specification design apparatus 100 of the energy storage system is designed to design an energy storage system (ESS) in which a power conversion system (PCS) is separately provided in each of battery racks connected in parallel , The number of battery racks and the output of the PCS can be designed so that the discharge rate of the battery rack meets the requirements of the ESS, but below the allowable discharge rate of the battery rack.

For this purpose, the requirement specification unit 110 may play a role of setting a required specification required for the ESS.

Here, the requirement specification of the ESS may include the required output and the power supply time of the ESS. More specifically, the required output of the ESS may be the magnitude of the power output from the ESS, and the power supply time may be the time to continuously supply the power of the required output of the ESS described above. For example, if the required output and the power supply time of the ESS are 1 MW and 1 hour, respectively, then the ESS requirement may be a power supply specification capable of supplying 1 MW of output power to the outside without external power for 1 hour.

In addition, the requirement setting unit 110 can calculate the required capacity of the ESS using the required output of the ESS and the power supply time. More specifically, the required specification setting unit 110 can calculate the required capacity of the ESS using the following equation (1).

&Quot; (1) "

Figure pat00007

Here, E c = required capacity of ESS

E p = required output of ESS

E t = power supply time of ESS

The number setting unit 120 may set the number of battery racks included in the ESS so as to satisfy the requirements of the ESS.

Here, the battery rack may include a plurality of battery modules, and the PCS may be connected to each of the battery racks so as to be connected in parallel between the battery racks.

That is, the number ratio of the battery rack and the PCS included in the ESS may be 1: 1.

In addition, the battery rack and PCS included in the ESS can each have the same performance.

The number setting unit 120 may initially set the number of battery racks using the required output of the ESS and the maximum output of the PCS at the beginning of designing the specification of the ESS.

Here, the maximum power of the PCS may be the maximum power that can be supplied from the PCS to the outside according to the performance of the PCS.

More specifically, the number setting unit 120 can calculate the number of battery racks to be set at the initial time point of designing the ESS specification by using the following equation (2).

&Quot; (2) "

Figure pat00008

Where B n = number of battery racks

E p = required output of ESS

P p '= maximum output of PCS

For example, the number setting unit 120 can calculate and set the number of battery racks to 10 when the required output of the ESS and the maximum output of the PCS are 1 MW and 100 kW, respectively.

The number setting unit 120 sets or updates the number of battery racks included in the ESS corresponding to the determination result of the determining unit 160, which will be described later, after the number of battery racks is initially set at the initial point of designing the specification of the ESS Can play a role.

A more specific description of the number setting unit 120 will be described later.

The output setting unit 130 may set the output of the PCS so that the output of the PCS satisfies the required output of the ESS according to the number of battery racks set from the number setting unit 120. [

In this case, the specification design apparatus 100 of the energy storage system according to the embodiment of the present invention designs the specification of the ESS having the battery rack and PCS ratio of 1: 1, The number of PCSs equal to the number of battery racks set may be included in the ESS.

Accordingly, the output setting unit 130 can calculate the output of each of the PCSs so that the magnitude of the power output from the number of PCSs equal to the number of battery racks set from the number setting unit 120 satisfies the required output of the ESS .

More specifically, the output setting unit 130 can calculate the output of the PCS using the following equation (3).

&Quot; (3) "

Figure pat00009

Here, P p = output of PCS

E p = required output of ESS

P n = number of PCS = B n = number of battery racks

For example, when the number of battery racks set by the demand output and number setting unit 120 of the ESS is 1 MW and 10, respectively, the output setting unit 130 can calculate and output the output of the PCS to 100 kW.

The available capacity calculating unit 140 may calculate the available capacity of the battery rack using the discharge rate of the battery rack according to the output of the PCS set from the output setting unit 130. [

More specifically, the usable capacity calculating section 140 calculates the ratio between the output of the PCS and the capacity of the battery rack as the discharge rate of the battery rack, and calculates the capacity ratio of the battery rack by using the capacity correction constant mapped to the discharge rate of the battery rack. It is possible to calculate the usable capacity.

Here, the capacity of the battery rack may be the capacity according to the operating voltage of the battery rack provided by the manufacturer of the battery rack.

The capacity correction constant is a constant for correcting the capacity of the battery rack, which is changed according to the discharge rate of the battery rack, and may be a predetermined constant through a charge / discharge test of the battery rack. In addition, the capacity correction constant may include an available capacity ratio, a lifetime factor, and a loss factor.

The available capacity calculating unit 140 may calculate the discharge rate of the battery rack and the available capacity of the battery rack using the following equation (4).

&Quot; (4) "

Figure pat00010

Where C = discharge rate of the battery rack

P p = output of PCS

B c = Capacity of battery rack

B ac = Available capacity of battery rack

R ac = available capacity ratio

F life = lifetime factor

F loss = loss factor

On the other hand, the capacity correction constants can be mapped according to the discharge rate in the form of a table as shown in Table 1 below.

Discharge rate (C) Available capacity ratio (R ac ) Lifetime Factor (F life ) Loss factor (F loss ) 1.08 0.945 0.873 0.997 0.98 0.95 0.881 0.997 0.90 0.957 0.887 0.997 0.83 0.957 0.892 0.997

For example, when the output of the PCS is set to 100 kW and the capacity of the battery rack is 92 kWH, the available capacity calculating section 140 calculates the discharge rate of the battery rack to 1.08 and the available capacity ratio mapped to the discharge rate 1.08 of the battery rack 0.945, the life factor of 0.873, and the loss factor of 0.997 can be multiplied by the capacity of the battery rack to calculate the available capacity of the battery rack as 75.7 kWh.

The discharging time calculating unit 150 may calculate the discharging time of the battery rack when discharging the battery rack from the output of the PCS set by the output setting unit 130 described above .

At this time, the discharge time calculating unit 150 can calculate the discharge time of the battery rack using the following equation (5).

Equation (5)

Figure pat00011

Where B t = discharge time of the battery rack

B ac = Available capacity of battery rack

P p = output of PCS

For example, when the output of the PCS is set to 100 kW and the usable capacity of the battery rack calculated by the usable capacity calculating unit 140 is 75.7 kWh, the discharge time calculating unit 150 calculates the discharge time of the battery rack to 0.757 h .

The determination unit 160 determines whether the output of the PCS set by the output setting unit 130 and the discharge time of the battery rack calculated by the discharge time calculating unit 150 satisfy the required output and power supply time of the ESS, respectively Can play a role.

The determination unit 160 may also determine whether the discharge rate of the battery rack calculated by the available capacity calculation unit 140 is less than an allowable discharge rate of the battery rack.

At this time, the specification determining unit 170 determines the number of battery racks set from the number setting unit 120 and the output of the PCS set from the output setting unit 130 as the specification of the ESS, corresponding to the result of the determining unit 150 Can play a role.

More specifically, when the determination unit 160 determines that the discharge time of the battery rack calculated from the output of the PCS set by the output setting unit 130 and the discharge time calculation unit 150 is equal to the ESS When the discharge rate of the battery rack calculated by the usable capacity calculating section 140 is equal to or lower than the allowable discharge rate of the battery rack, the number of battery racks set from the number setting section 120, It is possible to determine the output of the PCS set by the ESS 130 as the specification of the ESS.

Accordingly, in designing the ESS, the apparatus 100 for designing an energy storage system according to the present invention can determine the number of battery racks included in the ESS and the number of PCSs included in the ESS so as to satisfy the required output and power supply time of the ESS required for the ESS. The output can be designed quickly and accurately.

On the other hand, if it is determined by the determination unit 160 that the output of the PCS set by the output setting unit 130 and the discharge time of the battery rack calculated by the discharge time calculating unit 150 are equal to or less than the requested output and power supply time of the ESS, If one is not satisfied or the discharge rate of the battery rack calculated by the usable capacity calculating unit 140 exceeds the allowable discharge rate of the battery rack, the number setting unit 120 can increase or decrease the number of battery racks.

The output setting unit 130, the usable capacity calculating unit 140 and the discharging time calculating unit 150 calculate the output of the above-described PCS by reflecting the number of battery racks reset from the number setting unit 120, Available capacity, discharge rate and discharge time can be calculated.

Then, the determination unit 160 can determine again whether the re-calculated and reset values satisfy the requirements of the ESS and whether the discharge rate of the battery rack is equal to or less than the allowable discharge rate.

Accordingly, the number setting unit 120 can add and set the number of battery racks until the determination unit 160 satisfies all the conditions.

FIG. 4 is a flowchart illustrating a procedure of a specification design method of an energy storage system according to an embodiment of the present invention.

Referring to FIG. 4, in designing an ESS in which PCSs are individually provided in each of the battery racks connected in parallel, the requirement specification unit sets a required specification required for the ESS (S401).

Here, the requirement specification of the ESS may include the required output and the power supply time of the ESS. More specifically, the required output of the ESS may be the magnitude of the power output from the ESS, and the power supply time may be the time to continuously supply the power of the required output of the ESS described above.

At the initial point of designing the ESS specification, the number setting unit sets the number of the battery racks first using the maximum output of the PCS so as to satisfy the output of the ESS among the requirements of the ESS (S402).

Here, the maximum power of the PCS may be the maximum power that can be supplied from the PCS to the outside according to the performance of the PCS.

Thereafter, the output setting unit sets the output of the PCS to the maximum output, and the ratio between the output of the PCS and the capacity of the battery rack in which the usable capacity calculating unit is set is calculated as the discharge rate of the battery rack (S403).

Here, the capacity of the battery rack may be the capacity according to the operating voltage of the battery rack provided by the manufacturer of the battery rack.

Then, the available capacity calculating unit calculates the available capacity of the battery rack using the capacity correction constant mapped to the discharge rate of the battery rack (S404).

In addition, the capacity correction constant may be a constant for correcting the capacity of the battery rack which is changed according to the discharge rate of the battery rack, and may be a predetermined constant through a charge / discharge test of the battery rack. In addition, the capacity correction constant may include an available capacity ratio, a lifetime factor, and a loss factor.

When discharging the battery rack with the output of the PCS set by the discharge time calculating unit, the time for which the battery rack is fully discharged is calculated and calculated as the discharge time of the battery rack (S405).

 Thereafter, the judging unit judges whether the output of the set PCS and the discharging time of the battery rack satisfy the required output and power supply time of the ESS, which is the ESS requirement, and whether the discharge rate of the battery rack is equal to or less than the allowable discharge rate (S406 If the output of the set PCS and the discharging time of the battery rack satisfy the required output and power supply time of the ESS and the discharge rate of the battery rack is equal to or less than the allowable discharge rate of the battery rack as a result of the determination by the determination unit, And the output of the PCS set by the output setting unit is determined as the specifications of the ESS (S407).

On the other hand, if it is determined by the determination unit that the output of the PCS and the discharge time of the battery rack do not satisfy either the required output power or the power supply time of the ESS or the discharge rate of the battery rack exceeds the allowable discharge rate of the battery rack, The setting unit increments and resets the number of battery racks (S408).

In one embodiment, the number setting section may reset the number of battery racks by adding "1 " in the number of battery racks initially set.

On the other hand, in the embodiment, in the above-described number setting unit, the number of the battery racks is reset by adding "1" in the number of the battery racks initially set. However, in another embodiment, It is possible to reset the number of battery racks designed in the ESS by calculating the number of battery racks to satisfy both the required output and the power supply time of the ESS.

That is, in another embodiment, the number setting unit can reset the number of battery racks to exceed "1 ".

Next, the output setting unit resets the output of the PCS in accordance with the number of the re-set battery racks (S409), and returns to step S403 to re-start from step S403 using the reset and re-calculated values.

Meanwhile, the specification design method of the energy storage system using the apparatus for designing the specifications of the energy storage system according to an embodiment of the present invention may be implemented in the form of a program command which can be executed through various computer means, have. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software.

Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Any type of hardware device configured to store and perform program instructions, such as magneto-optical media, and ROM, ROM, flash memory, and the like, may be included. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such a hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

The teachings of the principles of the present invention may be implemented as a combination of hardware and software. In addition, the software can be implemented as an application program that is actually implemented on the program storage unit. The application program can be uploaded to and executed by a machine that includes any suitable architecture. Advantageously, the machine may be implemented on a computer platform having hardware such as one or more central processing units (CPUs), a computer processor, a random access memory (RAM), and input / output (I / . In addition, the computer platform may include an operating system and microinstruction code. The various processes and functions described herein may be part of microcommand codes or a portion of an application program, or any combination thereof, and they may be executed by various processing devices including a CPU. In addition, various other peripheral devices such as additional data storage and printers may be connected to the computer platform.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: Specification of energy storage system design device
110: required specification setting section
120: number setting unit
130: Output setting unit
140: available capacity calculating section
150: discharge time calculating unit
160:
170: Specification determining section

Claims (22)

1. An apparatus for designing an energy storage system (ESS) in which a power conversion system (PCS) is individually provided in each of battery racks connected in parallel,
A number setting unit for setting the number of the battery racks;
An output setting unit for setting an output of the PCS such that the output of the PCS satisfies a required output of the ESS according to the number of the battery racks;
An available capacity calculating unit for calculating an available capacity of the battery rack by using a discharge rate of the battery rack according to an output of the PCS;
A discharge time calculating unit for calculating a discharge time of the battery rack;
A determination unit for determining whether the output of the PCS and the discharge time of the battery rack satisfy the required output and power supply time of the ESS, respectively; And
And a specification determination unit that determines the number of the battery racks and the output of the PCS as the specification of the ESS corresponding to the result of the determination unit.
Designing of systems of the storage of energy-storage systems.
The method according to claim 1,
And a requirement specification setting unit for setting a requirement specification of the ESS.
Designing of systems of the storage of energy-storage systems.
3. The method of claim 2,
Wherein the requirement specification of the ESS includes a required output and a power supply time of the ESS.
Designing of systems of the storage of energy-storage systems.
The method according to claim 1,
Wherein the output setting unit comprises:
Wherein the output of the PCS is calculated using the following equation: < EMI ID =
Designing of systems of the storage of energy-storage systems.
&Lt; Equation &
Figure pat00012

Here, P p = output of PCS
E p = required output of ESS
P n = number of PCS = B n = number of battery racks
The method according to claim 1,
Wherein the available capacity calculating section calculates,
A ratio between the output of the PCS and the capacity of the battery rack is calculated as a discharge rate of the battery rack and an available capacity of the battery rack is calculated using a mapping capacity constant mapped to a discharge rate of the battery rack As a result,
Designing of systems of the storage of energy-storage systems.
6. The method of claim 5,
Wherein said capacity correction constant includes an available capacity ratio, a lifetime coefficient, and a loss factor.
Designing of systems of the storage of energy-storage systems.
The method according to claim 6,
Wherein the available capacity calculating section calculates,
And calculates a discharge rate of the battery rack and a usable capacity of the battery rack using the following equation: < EMI ID =
Designing of systems of the storage of energy-storage systems.
&Lt; Equation &
Figure pat00013

Where C = discharge rate of the battery rack
P p = output of PCS
B c = Capacity of battery rack
B ac = Available capacity of battery rack
R ac = available capacity ratio
F life = lifetime factor
F loss = loss factor
The method according to claim 1,
The discharge time calculating unit calculates the discharge time,
And the discharge time of the battery rack is calculated using the following equation: < EMI ID =
Designing of systems of the storage of energy-storage systems.
&Lt; Equation &
Figure pat00014

Where B t = discharge time of the battery rack
B ac = Available capacity of battery rack
P p = output of PCS
The method according to claim 1,
Wherein,
And judges whether the discharge rate of the battery rack is equal to or less than an allowable discharge rate.
Designing of systems of the storage of energy-storage systems.
10. The method of claim 9,
The number-
If the output of the PCS and the discharge time of the battery rack do not satisfy either the required output or the power supply time of the ESS or the discharge rate of the battery rack exceeds the allowable discharge rate as a result of the determination, And the number of battery racks is increased or decreased.
Designing of systems of the storage of energy-storage systems.
10. The method of claim 9,
The specification determination unit determines,
When the output of the PCS and the discharging time of the battery rack satisfy the required output and power supply time of the ESS and the discharge rate of the battery rack is equal to or less than the allowable discharge rate, And the output of the PCS is determined as the specification of the ESS.
Designing of systems of the storage of energy-storage systems.
In a specification design method of an ESS in which PCSs are individually provided in each of parallel-connected battery racks,
The number setting unit setting the number of the battery racks;
Setting the output of the PCS such that the output setting unit satisfies the required output of the ESS according to the number of the battery racks;
Calculating a usable capacity of the battery rack using a discharge rate of the battery rack according to an output of the PCS;
Calculating a discharge time of the battery rack by a discharge time calculating unit;
Determining whether the output of the PCS and the discharge time of the battery rack satisfy the required output and power supply time of the ESS, respectively; And
Determining a number of the battery racks and an output of the PCS as the specification of the ESS corresponding to a result of the determination unit.
Specification of energy storage system design method.
13. The method of claim 12,
Further comprising a step of setting a requirement specification section to set a requirement specification of the ESS.
Specification of energy storage system design method.
14. The method of claim 13,
Wherein the requirement specification of the ESS includes a required output and a power supply time of the ESS.
Specification of energy storage system design method.
13. The method of claim 12,
Wherein the output setting unit calculates an output of the PCS using the following equation: < EMI ID =
Specification of energy storage system design method.
&Lt; Equation &
Figure pat00015

Here, P p = output of PCS
E p = required output of ESS
P n = number of PCS = B n = number of battery racks
13. The method of claim 12,
The available capacity calculating section calculates a ratio between the output of the PCS and the capacity of the battery rack as a discharge rate of the battery rack and calculates an available capacity of the battery rack using a capacity correction constant mapped to a discharge rate of the battery rack Further comprising the step of:
Specification of energy storage system design method.
17. The method of claim 16,
Wherein said capacity correction constant includes an available capacity ratio, a lifetime coefficient, and a loss factor.
Specification of energy storage system design method.
18. The method of claim 17,
Further comprising the step of calculating the available capacity of the battery rack and the discharge rate of the battery rack using the following equation:
Specification of energy storage system design method.
&Lt; Equation &
Figure pat00016

Where C = discharge rate of the battery rack
P p = output of PCS
B c = Capacity of battery rack
B ac = Available capacity of battery rack
R ac = available capacity ratio
F life = lifetime factor
F loss = loss factor
13. The method of claim 12,
Further comprising: calculating the discharge time of the battery rack using the following equation: < EMI ID =
Specification of energy storage system design method.
&Lt; Equation &
Figure pat00017

Where B t = discharge time of the battery rack
B ac = Available capacity of battery rack
P p = output of PCS
13. The method of claim 12,
Further comprising the step of determining whether the discharge rate of the battery rack is equal to or less than an allowable discharge rate,
Specification of energy storage system design method.
21. The method of claim 20,
If the number setting unit determines that the output of the PCS and the discharging time of the battery rack do not satisfy any one of the required output and the power supply time of the ESS as a result of the determination unit or the discharge rate of the battery rack exceeds the allowable discharge rate Further comprising the step of adding and resetting the number of the battery racks,
Specification of energy storage system design method.
21. The method of claim 20,
When the specification designing unit determines that the output of the PCS and the discharge time of the battery rack satisfy the required output and power supply time of the ESS and the discharge rate of the battery rack is equal to or less than the allowable discharge rate, And designing the output of the PCS to the specifications of the ESS.
Specification of energy storage system design method.
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