KR102030872B1 - 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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KR102030872B1
KR102030872B1 KR1020150161003A KR20150161003A KR102030872B1 KR 102030872 B1 KR102030872 B1 KR 102030872B1 KR 1020150161003 A KR1020150161003 A KR 1020150161003A KR 20150161003 A KR20150161003 A KR 20150161003A KR 102030872 B1 KR102030872 B1 KR 102030872B1
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output
battery rack
pcs
ess
energy storage
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KR1020150161003A
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KR20170057648A (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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3647—Constructional arrangements for determining the ability of a battery to perform a critical function, e.g. cranking
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health

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

Abstract

The present invention relates to an apparatus and method for designing specifications of an energy storage system, and more particularly, to an energy storage system in which a power conversion system (PCS) is separately provided in each of parallel battery racks. In order to design the specifications of the ESS according to the requirements of the Energy Storage System (ESS), the output of the PCS is set to satisfy the required output of the ESS according to the number of battery racks, and the discharge rate of the battery rack according to the set PCS output, The present invention relates to an apparatus and method for designing an energy storage system that calculates an available capacity and a discharge time in order, and determines the specifications of the ESS after determining whether the output and discharge times of the PCS satisfy the requirements of the ESS.

Description

Apparatus and method for designing of specification of energy storage system

The present invention relates to an apparatus and method for designing specifications of an energy storage system, and more particularly, to an energy storage system in which a power conversion system (PCS) is separately provided in each of parallel battery racks. In order to design the specifications of the ESS according to the requirements of the Energy Storage System (ESS), the output of the PCS is set to satisfy the required output of the ESS according to the number of battery racks, and the discharge rate of the battery rack according to the set PCS output, The present invention relates to an apparatus and method for designing an energy storage system that calculates an available capacity and a discharge time in order, and determines the specifications of the ESS after determining whether the output and discharge times of the PCS satisfy the requirements of the ESS.

In general, an energy storage system (ESS) installed in a power plant that drives a large power grid or a building that consumes a large amount of power is composed of a plurality of batteries. More specifically, the battery of the ESS is generally a battery rack (battery rack) consisting of a large number of battery modules (Battery Module) can be again composed of a large number, as a result of a large number of batteries gathered in a special space such as air conditioning buildings or containers Can be installed. In this case, a battery management system (BMS) is installed in a plurality of battery racks to monitor and control a control target such as a voltage, a current, a temperature, a circuit breaker, and the like.

Meanwhile, the Power Conversion System (PCS) is installed in the ESS to control the charging and discharging of the battery by controlling the power supplied from the external rotor and the power supplied from the battery rack to the outside, and the energy management system connected to the PCS (Enery). Management System (EMS) controls the output of the PCS based on the monitoring and control results of the BMS described above.

1 is a diagram illustrating a connection between a battery rack and a PCS of a conventional ESS.

1 and 2, the PSC 6 is individually stored in each of the ESS 1 or the battery rack 5 connected in parallel with the battery rack 2 connected in parallel with one PCS 3. There is an ESS (4) to be connected, and according to the connection configuration between the battery rack and PCS of the ESS, it is necessary to perform a different design method of the ESS.

More specifically, in the case of the specification design method of the ESS 1 having the configuration in which the battery racks 2 connected in parallel are connected to one PCS 3, the output of the PCS 3 is the required output of the ESS 1. The fixed and set, and the capacity and number of the battery rack (2) is 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 each of the battery racks 5 connected in parallel, the output of the PCS 6 connected to each of the battery racks 5 is required by the ESS 4. There was a problem that the output capacity could not be fixed and the capacity for each battery rack 5 was fixed, so that the initial capacity according to the requirements of the ESS 4 could not be calculated.

Accordingly, in order to solve the above-described problems, the present inventors design the specifications of the ESS corresponding to the requirements of the ESS in which the power conversion system is separately provided in each of the parallelly connected battery racks. Set the output of the PCS to satisfy the required output, calculate the discharge rate, usable capacity and discharge time of the battery rack according to the set PCS output in turn, and after determining whether the output and discharge time of the PCS meet the requirements of the ESS It has been invented a specification design apparatus and method for energy storage systems that determine the specifications of the ESS.

Korean Patent Publication No. 10-2011-0084751

The present invention has been made to solve the above-described problems, an object of the present invention is to set the output of the PCS to satisfy the required output of the ESS according to the number of battery racks, discharge rate of the battery rack according to the set PCS output, The available capacity and discharge time are calculated in turn, and after determining whether the output and discharge time of the PCS meet the requirements of the ESS, the ESS specification is determined. It is to provide a specification design apparatus and method of an energy storage system that can design the specifications of the ESS in response to the requirements of the specification.

According to an embodiment of the present invention, there is provided an apparatus for designing an energy storage system (ESS) having a power conversion system (PCS) separately provided in each of a battery rack connected in parallel. The specification design apparatus of the energy storage system includes: a number setting unit configured to set the number of the battery racks; An output setting unit configured to set the output of the PCS such that the output of the PCS satisfies the required output of the ESS according to the number of battery racks; An available capacity calculator configured to calculate an available capacity of the battery rack by using a discharge rate of the battery rack according to the output of the PCS; A discharge time calculator configured to calculate a discharge time of the battery rack; A determination 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 a specification determiner configured to determine the number of battery racks and the output of the PCS as a specification of the ESS corresponding to a result of the determiner.

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

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

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

Equation

Figure 112015111917426-pat00001

 Where Pp = output of PCS

Ep = required output of ESS

Pn = Number of PCS = Bn = Number of Battery Racks

The available capacity calculation 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 the available capacity of the battery rack by using a capacity correction constant mapped to the 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 by using the following equation.

Equation

Figure 112015111917426-pat00002

Where C = discharge rate of the battery rack

P p = output of PCS

B c = capacity of the battery rack

B ac = usable capacity of the battery rack

R ac = usable capacity ratio

F life = life factor

F loss = loss factor

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

Equation

Figure 112015111917426-pat00003

Where B t = discharge time of the battery rack

B ac = usable capacity of the battery rack

P p = output of PCS

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

The number setting unit determines that the output of the PCS and the discharge time of the battery rack do not satisfy any one of the required output and the power supply time of the ESS, respectively, or the discharge rate of the battery rack is equal to an allowable discharge rate. If exceeded, the number of battery racks may be reset by adding or subtracting the number.

The specification determiner 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, respectively, and the discharge rate of the battery rack is equal to or less than an allowable discharge rate. The number of racks and the output of the PCS can be determined by the specification of the ESS.

In the specification design method of the ESS, each PCS is provided in each of the parallel connected battery racks, The specification design method of the energy storage system according to an embodiment of the present invention, Step number setting unit for setting the number of the battery rack; Setting, by an output setting unit, an output of the PCS such that the output of the PCS satisfies a required output of the ESS according to the number of battery racks; Calculating a usable capacity of the battery rack by using an available capacity calculation unit using a 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 calculator; Determining, by the determiner, 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, by the specification determiner, the number of battery racks and the output of the PCS as the specification of the ESS in response to a result of the determiner.

The specification design method of the energy storage system may further include a requirement specification setting unit to set a requirement of the ESS.

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

The specification design method of the energy storage system may further include calculating, by the output setting unit, the output of the PCS by using the following equation.

Equation

Figure 112015111917426-pat00004

Where Pp = output of PCS

Ep = required output of ESS

Pn = Number of PCS = Bn = Number of Battery Racks

In the spec design method of the energy storage system, the available capacity calculator 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. The method may further include calculating an available capacity of the battery rack.

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

The specification design method of the energy storage system may further include calculating the discharge rate of the battery rack and the available capacity of the battery rack by the available capacity calculator using the following equation.

Equation

Figure 112015111917426-pat00005

Where C = discharge rate of the battery rack

P p = output of PCS

B c = capacity of the battery rack

B ac = usable capacity of the battery rack

R ac = usable capacity ratio

F life = life factor

F loss = loss factor

The specification design method of the energy storage system may further include the step of calculating the discharge time of the battery rack by the discharge time calculation unit using the following equation.

Equation

Figure 112015111917426-pat00006

Where B t = discharge time of the battery rack

B ac = usable capacity of the battery rack

P p = output of PCS

The specification design method of the energy storage system may further include determining whether the discharge rate of the battery rack is less than an allowable discharge rate.

In the specification design method of the energy storage system, the number setting unit determines that the output of the PCS and the discharge time of the battery rack do not satisfy any one of the required output and the power supply time of the ESS, respectively, If the discharge rate of the battery rack exceeds the allowable discharge rate, the step of resetting by subtracting the number of the battery rack; may further include.

In the specification design method of the energy storage system, the specification design 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, respectively, and the discharge rate of the battery rack is determined. If less than the allowable discharge rate, the step of designing the number of the battery rack and the output of the PCS to the specification of the ESS; may further include.

An apparatus and method for designing an energy storage system according to an exemplary embodiment of the present invention calculates an available capacity of the battery rack by using a discharge rate of the battery rack according to an output of a set power conversion system (PCS). In addition, the output of the PCS can be set to accurately satisfy the required output of the Energy Storage System (ESS).

In addition, when the discharge rate of the battery rack is less than the allowable discharge rate, by determining the number of the battery rack and the output of the PCS as the specification of the ESS, the effect that can improve the life and safety of the battery rack provided in the ESS Has

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

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Here, the repeated description, well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention, and detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more completely describe the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise.

In addition, the term "... unit" described in the specification means a unit for processing one or more functions or operations, which may be implemented in hardware or software or a combination of hardware and software.

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

Referring to FIG. 3, the specification design apparatus 100 of the energy storage system includes a requirement specification setting unit 110, a number setting unit 120, an output setting unit 130, an available capacity calculation unit 140, and a discharge time calculation. The unit 150 may include a determination unit 160 and a specification determination unit 170. The specification design apparatus 100 of the energy storage system shown in FIG. 3 is according to an embodiment, and its components are not limited to the embodiment shown in FIG. 3, and may be added, changed or deleted as necessary. have.

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

To this end, the requirement specification setting unit 110 may serve to set a requirement specification required for the ESS.

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

In addition, the requirement specification setting unit 110 may calculate the required capacity of the ESS using the required output and power supply time of the ESS. More specifically, the requirement specification setting unit 110 may calculate the required capacity of the ESS using Equation 1 below.

<Equation 1>

Figure 112015111917426-pat00007

Where E c = required capacity of ESS

E p = required output of ESS

E t = power supply time of the ESS

The number setting unit 120 may serve to set the number of battery racks included in the ESS 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 battery rack to be connected in parallel between the battery racks.

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

In addition, the battery rack and PCS included in the ESS may 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 initial time of designing the specification of the ESS.

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

More specifically, the number setting unit 120 may calculate the number of battery racks set at the first time of designing the specification of the ESS using Equation 2 below.

<Equation 2>

Figure 112015111917426-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 may 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 changes the number of battery racks included in the ESS in response to the determination result of the determination unit 160 to be described later after initially setting the number of battery racks at the first time of designing the specification of the ESS. It can play a role.

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

The output setting unit 130 may serve to 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 by the number setting unit 120.

At this time, the specification design device 100 of the energy storage system according to an embodiment of the present invention design the specifications of the ESS consisting of the number ratio of the battery rack and PCS 1: 1, the number of battery rack from the setting unit 120 When the number of Ps is set, the same number of PCSs as the number of battery racks set may be included in the ESS.

Accordingly, the output setting unit 130 may calculate the output of each PCS so that the amount of power output from the same number of PCSs as the number of battery racks set by the number setting unit 120 satisfies the required output of the ESS. .

More specifically, the output setting unit 130 may calculate the output of the PCS by using Equation 3 below.

<Equation 3>

Figure 112015111917426-pat00009

Where 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 from the required output and the number setting unit 120 of the ESS is 1 MW and 10, respectively, the output setting unit 130 may calculate and set the output of the PCS to 100 kW.

The usable capacity calculating unit 140 may serve to calculate the usable 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 unit 140 calculates a ratio between the output of the PCS and the capacity of the battery rack as the discharge rate of the battery rack, and uses the capacity correction constant mapped to the discharge rate of the battery rack. The available capacity of can be calculated.

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

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

The usable capacity calculation unit 140 may calculate the discharge rate of the battery rack and the usable capacity of the battery rack using Equation 4 below.

<Equation 4>

Figure 112015111917426-pat00010

Where C = discharge rate of the battery rack

P p = output of PCS

B c = capacity of the battery rack

B ac = usable capacity of the battery rack

R ac = usable capacity ratio

F life = life factor

F loss = loss factor

Meanwhile, the capacity correction constant may be mapped for each discharge rate in a table form as shown in Table 1 below.

Discharge rate (C) Usable Capacity Ratio (R ac ) F life F loss factor 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 capacity of the PCS is set to 100 kW and the capacity of the battery rack is 92 kWH, the usable capacity calculating unit 140 calculates the discharge rate of the battery rack as 1.08 and the usable capacity ratio mapped to the discharge rate of 1.08 of the battery rack. The usable capacity of the battery rack can be calculated as 75.7 kWh by multiplying 0.945, life factor 0.873 and loss factor 0.997 by the capacity of the battery rack.

When the discharge time calculator 150 discharges the battery rack by the output of the PCS set from the above-described output setting unit 130, the discharge time calculator 150 may serve to calculate the discharge time of the battery rack as a discharge time of the battery rack. .

In this case, the discharge time calculator 150 may calculate the discharge time of the battery rack using Equation 5 below.

<Equation 5>

Figure 112015111917426-pat00011

Where B t = discharge time of the battery rack

B ac = usable capacity of the battery rack

P p = output of PCS

For example, when the output time of the PCS is set to 100 kW and the usable capacity of the battery rack calculated from the usable capacity calculation unit 140 is 75.7 kWh, the discharge time calculation unit 150 sets the discharge time of the battery rack to 0.757 h. It can be calculated as

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

In addition, the determination unit 160 may serve to determine whether the discharge rate of the battery rack calculated from the available capacity calculation unit 140 is less than or equal to the allowable discharge rate of the battery rack.

At this time, the specification determining unit 170 determines the number of battery racks set by the number setting unit 120 and the output of the PCS set by the output setting unit 130 as the specification of the ESS in response to the result of the determination unit 160. It can play a role.

More specifically, the specification determiner 170 determines that the discharge time of the battery rack calculated from the output and discharge time calculation unit 150 of the PCS set by the output setting unit 130 is determined by the determination unit 160. If the required output and the power supply time of the satisfactory, and the discharge rate of the battery rack calculated from the available capacity calculation unit 140 is less than the allowable discharge rate of the battery rack, the number and output setting unit of the battery rack set from the number setting unit 120 The output of the PCS set up from 130 may be determined as a specification of the ESS.

Through this, the specification design device 100 of the energy storage system according to the present invention in the design of the ESS, the number of battery racks and PCS included in the ESS 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, as a result of the determination of the determination unit 160, the discharge time of the battery rack calculated from the output and discharge time calculation unit 150 of the PCS set by the output setting unit 130, each of the required output and power supply time of the ESS If one does not satisfy or the discharge rate of the battery rack calculated from the usable capacity calculation unit 140 exceeds the allowable discharge rate of the battery rack, the number setting unit 120 may reset the number of battery racks.

Subsequently, the output setting unit 130, the available capacity calculating unit 140, and the discharge time calculating unit 150 reflect the number of battery racks reset from the number setting unit 120 to output the PCS and the battery racks. Available capacity, discharge rate and discharge time can be recalculated.

Subsequently, the determination unit 160 may determine again whether the recalculated and reset values satisfy the requirements of the ESS and whether the discharge rate of the battery rack is less than or equal to the allowable discharge rate.

Through this, the number setting unit 120 may add or subtract the number of battery racks until all the conditions are satisfied in the determination unit 160.

4 is a flowchart illustrating a procedure of performing 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 parallel battery racks, the requirement specification setting unit sets a requirement required for the ESS (S401).

Here, the required specification of the ESS may include a required output and power supply time of the ESS. More specifically, the required output of the ESS may be the amount of power output from the ESS, and the power supply time may be a time for continuously supplying the power of the required output of the ESS described above.

At the first time of designing the specification of the ESS, the number setting unit initially sets the number of battery racks using the maximum output of the PCS so as to satisfy the output of the ESS among the required specifications of the ESS (S402).

Here, the maximum output of the PCS may be the maximum amount of power that can be supplied to the outside from the PCS 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 set PCS and the capacity of the battery rack set by the available capacity calculator 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 from the manufacturer of the battery rack.

Subsequently, the available capacity calculator 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 changed according to the discharge rate of the battery rack, it may be a predetermined constant through the charge and discharge experiment of the battery rack. In addition, the capacity correction constant may include an available capacity ratio, a lifetime factor, and a loss factor.

When the discharge time calculating unit discharges the battery rack with the output of the set PCS, the discharge time of the battery rack is calculated and calculated as the discharge time of the battery rack (S405).

 Subsequently, the determination unit determines whether the output power of the PCS and the discharge time of the battery rack satisfy the required output and power supply time of the ESS, which are required specifications of the ESS, respectively, and whether the discharge rate of the battery rack is less than the allowable discharge rate (S406). When 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 the discharge rate of the battery rack is less than or equal to the allowable discharge rate of the battery rack, the specification determination unit determines the number setting unit. The number of battery racks set and the output of the PCS set from the output setting unit are determined as the specification of the ESS (S407).

On the contrary, if the determination result of the determination unit indicates that the output time of the PCS and the discharge time of the battery rack do not satisfy any one of the required output and 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 resets by adding or subtracting the number of battery racks (S408).

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

Meanwhile, in one embodiment, the above-described number setting unit resets the number of battery racks by adding "1" to the number of battery racks initially set, but in another embodiment, the number setting unit discharges the output of the PCS and the discharge of the battery rack. The number of battery racks designed for the ESS may be reset by calculating the number of battery racks for each time satisfying the required output and power supply time of the ESS.

That is, in another embodiment, the number setting unit may reset the number of battery racks beyond "1".

Subsequently, the output setting unit resets the output of the PCS corresponding to the reset number of battery racks (S409), and returns to step S403, and re-executes from step S403 using the reset and recalculated values.

On the other hand, the specification design method of the energy storage system using the specification design device of the energy storage system according to an embodiment of the present invention is implemented in the form of program instructions that can be executed by various computer means can be recorded on a computer readable medium have. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and any type of hardware device specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions may include high-level language code that can be executed by a computer using an interpreter as well as machine code such as produced by a compiler. Such hardware devices 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 present principles can be implemented as a combination of hardware and software. In addition, the software may be implemented as an application program that is actually implemented on the program storage unit. The application can be uploaded to and executed by a machine that includes any suitable architecture. Preferably, the machine may be implemented on a computer platform having hardware such as one or more central processing units (CPU), computer processor, random access memory (RAM), and input / output (I / O) interfaces. . In addition, the computer platform may include an operating system and micro instruction code. The various processes and functions described herein may be part of micro instruction code or part 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.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

100: design device of the specification of the energy storage system
110: requirements specification section
120: number setting unit
130: output setting unit
140: usable capacity calculation unit
150: discharge time calculation unit
160: judgment unit
170: specification determination unit

Claims (22)

In the specification design device of the energy storage system (ESS) provided with a power conversion system (PCS) separately in each of the parallel battery rack (Battery Rack),
A number setting unit for setting the number of battery racks;
An output setting unit configured to set the output of the PCS such that the output of the PCS satisfies the required output of the ESS according to the number of battery racks;
An available capacity calculator configured to calculate an available capacity of the battery rack by using a discharge rate of the battery rack according to the output of the PCS;
A discharge time calculator configured to calculate a discharge time of the battery rack;
A determination 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
And a specification determiner configured to determine the number of the battery racks and the output of the PCS as a specification of the ESS corresponding to the result of the determiner.
Specification design device for energy storage systems.
The method of claim 1,
Characterized in that it further comprises; a requirements specification setting unit for setting the requirements of the ESS;
Specification design device for energy storage systems.
The method of claim 2,
The required specification of the ESS is characterized in that it comprises the required output and power supply time of the ESS,
Specification design device for energy storage systems.
The method of claim 1,
The output setting unit,
To calculate the output of the PCS using the following equation,
Specification design device for energy storage systems.
Equation
Figure 112015111917426-pat00012

Where P p = output of PCS
E p = required output of ESS
P n = number of PCS = B n = number of battery racks
The method of claim 1,
The available capacity calculation unit,
The ratio between the output of the PCS and the capacity of the battery rack is calculated as the discharge rate of the battery rack, and the available capacity of the battery rack is calculated using a capacity correction constant mapped to the discharge rate of the battery rack. Made,
Specification design device for energy storage systems.
The method of claim 5,
The capacity correction constant is characterized in that it comprises an available capacity ratio, life factor and loss factor,
Specification design device for energy storage systems.
The method of claim 6,
The available capacity calculation unit,
A discharge rate of the battery rack and an available capacity of the battery rack are calculated using the following equation,
Specification design device for energy storage systems.
Equation
Figure 112015111917426-pat00013

Where C = discharge rate of the battery rack
P p = output of PCS
B c = capacity of the battery rack
B ac = usable capacity of the battery rack
R ac = usable capacity ratio
F life = life factor
F loss = loss factor
The method of claim 1,
The discharge time calculation unit,
To calculate the discharge time of the battery rack using the following equation,
Specification design device for energy storage systems.
Equation
Figure 112015111917426-pat00014

Where B t = discharge time of the battery rack
B ac = usable capacity of the battery rack
P p = output of PCS
The method of claim 1,
The determination unit,
Determining whether the discharge rate of the battery rack is equal to or less than an allowable discharge rate.
Specification design device for energy storage systems.
The method of claim 9,
The number setting unit,
When the determination result of the determination unit, the output of the PCS and the discharge time of the battery rack does not satisfy any one of the required output and power supply time of the ESS, respectively, or if the discharge rate of the battery rack exceeds the allowable discharge rate, Resetting by adding or subtracting the number of battery racks,
Specification design device for energy storage systems.
The method of claim 9,
The specification determination unit,
If the output of the PCS and the discharge time of the battery rack satisfies the required output and power supply time of the ESS, respectively, and the discharge rate of the battery rack is less than the allowable discharge rate, the number of the battery rack and the determination Characterized in that the output of the PCS to the specification of the ESS,
Specification design device for energy storage systems.
In the specification design method of the ESS that each PCS is provided in each of the parallel connected battery rack,
Setting a number of battery racks by a number setting unit;
Setting, by an output setting unit, an output of the PCS such that the output of the PCS satisfies a required output of the ESS according to the number of battery racks;
Calculating a usable capacity of the battery rack by using an available capacity calculation unit using a 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 calculator;
Determining, by the determiner, 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 determining, by the specification determiner, the number of battery racks and the output of the PCS as the specification of the ESS, in response to a result of the determiner.
How to design specifications for energy storage systems.
The method of claim 12,
Characterized in that the requirements specification setting step for setting the requirements of the ESS;
How to design specifications for energy storage systems.
The method of claim 13,
The required specification of the ESS is characterized in that it comprises the required output and power supply time of the ESS,
How to design specifications for energy storage systems.
The method of claim 12,
And calculating, by the output setting unit, an output of the PCS using the following equation.
How to design specifications for energy storage systems.
Equation
Figure 112015111917426-pat00015

Where P p = output of PCS
E p = required output of ESS
P n = number of PCS = B n = number of battery racks
The method of claim 12,
The available capacity calculator 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 the discharge rate of the battery rack. Characterized in that it further comprises;
How to design specifications for energy storage systems.
The method of claim 16,
The capacity correction constant is characterized in that it comprises an available capacity ratio, life factor and loss factor,
How to design specifications for energy storage systems.
The method of claim 17,
And calculating the available capacity of the battery rack by the available capacity calculator using the following equation.
How to design specifications for energy storage systems.
Equation
Figure 112015111917426-pat00016

Where C = discharge rate of the battery rack
P p = output of PCS
B c = capacity of the battery rack
B ac = usable capacity of the battery rack
R ac = usable capacity ratio
F life = life factor
F loss = loss factor
The method of claim 12,
And a step of calculating the discharge time of the battery rack by the discharge time calculating unit using the following equation.
How to design specifications for energy storage systems.
Equation
Figure 112015111917426-pat00017

Where B t = discharge time of the battery rack
B ac = usable capacity of the battery rack
P p = output of PCS
The method of claim 12,
And determining, by the determiner, whether a discharge rate of the battery rack is less than an allowable discharge rate.
How to design specifications for energy storage systems.
The method of claim 20,
The number setting unit determines that the output of the PCS and the discharge time of the battery rack do not satisfy any one of the required output and power supply time of the ESS, respectively, or the discharge rate of the battery rack exceeds an allowable discharge rate. If so, the step of resetting by adding or subtracting the number of the battery rack; characterized in that it further comprises,
How to design specifications for energy storage systems.
The method of claim 20,
When the specification determiner 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, respectively, and the discharge rate of the battery rack is less than an allowable discharge rate, the battery rack is determined. Determining the number of and the output of the PCS as the specification of the ESS; characterized in that it further comprises,
How to design specifications for energy storage systems.
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