KR20180091692A - Unified management system for ess, and management and power control method thereof - Google Patents

Abstract

The present invention relates to an integrated management system for an ESS, a management method thereof, and a power supply control method thereof. The power supply control method includes the steps of: receiving an external input requesting the participation of a demand reaction (DR); calculating a total dischargeable capacity of a plurality of ESSs based on information received from the plurality of ESSs; comparing the calculated total dischargeable capacity with a participation contract capacity for the DR; and transmitting a grid discharge command to the plurality of ESSs included in a DR participation target based on a comparison result. Accordingly, in the integrated management system for an ESS, profits can be generated by the DR participation. While stable power required in the DR can be secured, a benefit of a customer side with a high power saving effect using the ESS can be maintained.

Description

TECHNICAL FIELD [0001] The present invention relates to an ESS integrated management system, a management method thereof, and a power supply control method,

The present invention relates to an ESS integrated management system, a management method thereof, and a power supply control method, and more particularly, to an ESS integrated management system that integrally manages an ESS and controls power supply using charging and discharging of the ESS, A management method thereof, and a power supply control method.

Energy Storage System (ESS) refers to a storage device that stores excess power generated at a power plant and temporarily delivers power when power is insufficient. The ESS includes a battery that stores electricity, and related configurations such as a Power Conditioning System (PCS), an Energy Management System (EMS), and a Battery Management System (BMS) to efficiently manage the battery.

As the demand for electricity from industrial development increases year by year, the amount of electricity used in the consumer is also increasing. However, there is a real limit to increasing power production facilities. Thus, as part of the energy policy at the national level, policies are being continuously promoted to encourage and support the installation of ESSs to various cus- tomers, such as individual houses, apartment houses, office spaces, and factory facilities.

However, it takes a lot of cost to construct an ESS, and there are various complicated problems such as battery, PCS, EMS, BMS, etc., and it is burdensome to install the ESS in the customer's standpoint.

In addition, since the power consumption and usage patterns are different depending on the characteristics of the installation sites such as houses and factory facilities, efficient management and power supply control to maximize the energy saving effect by the entire system after the establishment of ESS There is a demand for.

It is an object of the present invention to provide an ESS integrated management system, a management method, and a power supply control method that enable a customer to receive a power charge reduction benefit using an ESS without burdening the customer to construct an ESS to provide.

In addition, it provides ESS integrated management system that can provide optimized management service according to customer's power consumption and usage patterns, enables efficient control of power supply using charge / discharge of ESS, A management method thereof, and a power supply control method.

A method for integrally managing an ESS (Energy Storage System) according to an embodiment of the present invention is a method for managing an ESS by using a cost for building a predetermined ESS, Determining a payback period and a payback ratio to be maintained by the manager; The target amount corresponding to the target return rate using the ESS and the step of determining the ratio of the profit distribution of the ESS between the manager and the customer after the recovery period has elapsed by using the expected electric power saving amount of the customer in the interval after the recovery period has elapsed .

을 만족하는 가장 작은 값을 가지는 정수 n으로 결정될 수 있으며, C는 관리자가 ESS를 구축하는데 소요된 비용을 나타내고, S₁ 내지 S_n 은 각각 첫번째 년도부터 n번째 년도까지 예상되는 고객의 전력요금 절감액을 나타내고, R은 기설정된 회수비율을 나타낸다. Here, in the step of determining the payback period and the payout ratio, the payout ratio indicates a rate at which the customer's power cost savings is distributed to the administrator during the payback period, and is set based on at least one of the building capacity of the ESS and the customer's power use pattern . In addition,

, C represents the cost required for the administrator to construct the ESS, and S ₁ to S _n Represents the anticipated customer's electricity cost savings from the first year to the n-th year, and R represents the predetermined number of times of recovery.

In addition, in the step of determining the profit distribution ratio of the ESS, the target amount is estimated by estimating the estimated profit of the customer and the incidental expenses according to the use of the ESS by year, and subtracting the incidental expenses from the estimated estimated return, Can be determined as the minimum amount to be achieved.

In addition, the electricity cost reduction is the sum of the basic charge saving and the electric power charge saving, and the basic charge saving is calculated by multiplying the annual peak peak capacity by the predetermined standard charge rate, and the electric power charge reduction can correspond to the charge difference have.

Meanwhile, a power supply control method using charging / discharging of an ESS according to an embodiment of the present invention includes receiving an external input requesting participation of a demand reaction (DR); Calculating a total dischargeable capacity of a plurality of ESSs based on information received from the plurality of ESSs; Comparing the calculated total dischargeable capacity with participation contract capacity for DR; And transmitting a grid discharge command to a plurality of ESSs included in the DR participation target based on the comparison result.

Determining a power cost saving benefit for each of the plurality of ESSs when the total dischargeable capacity is equal to or greater than the DR participation contract capacity; Arranging a plurality of ESSs according to a first sorting order corresponding to a lower order of power charge saving benefits; Summing the dischargeable capacities of each of the plurality of ESSs to correspond to the DR participation contract capacity according to the first sorting order; And transmitting a grid discharge command to each ESS included in the summing.

Calculating an additional required capacity excluding the total dischargeable capacity from the DR participation contract capacity when the total dischargeable capacity is less than the DR participation contract capacity as a result of the comparison; Aligning the plurality of ESSs according to a second sort order determined based on at least one of a charge rate and a battery charge of each of the plurality of ESSs; Summing the chargeable capacities of each of the plurality of ESSs in accordance with the second sort order so as to correspond to the additional required capacity; Transmitting a charge command to each ESS included in the sum; And transmitting the system discharge command to the ESS included in the total dischargeable capacity and the ESS corresponding to the charge command. Here, the step of aligning the plurality of ESSs according to the second sorting order may align the plurality of ESSs according to the charge rates, and the two or more ESSs having the same sorting charge rates may be sorted according to the battery capacity.

을 만족하는 가장 작은 값을 가지는 정수 n을 회수기간으로 결정할 수 있으며, C는 관리자가 ESS를 구축하는데 소요된 비용을 나타내고, S₁ 내지 S_n 은 각각 첫번째 년도부터 n번째 년도까지 예상되는 고객의 전력요금 절감액을 나타내고, R은 기설정된 회수비율을 나타낸다.Meanwhile, a system for integrally managing an ESS according to an embodiment of the present invention includes a plurality of ESSs; A communication unit that communicates with a plurality of ESSs, a payback period and a number of times to maintain the cost of constructing the ESS to an administrator by using a cost required for establishing a predetermined ESS and a cost reduction amount of a customer estimated based on utilization of the ESS The target amount corresponding to the target return rate using the ESS, and the amount of the electric power cost reduction of the customer expected in the period after the recovery period has elapsed, so that the profit distribution of the ESS between the manager and the customer after the recovery period has elapsed And a control unit for controlling the communication unit to integrally manage the plurality of ESSs based on the determination result. Here, the recovery ratio is set based on at least one of the building capacity of the ESS and the power usage pattern of the customer, which represents the rate at which the customer's electricity cost savings is distributed to the manager during the collection period,

, C denotes a cost required for the administrator to construct the ESS, and S ₁ to S _n Represents the anticipated customer's electricity cost savings from the first year to the n-th year, and R represents the predetermined number of times of recovery.

In addition, the control unit can determine the target amount by estimating the estimated profit of the customer according to the ESS utilization and the required incidental expenses by year, and by minimizing the supplementary cost from the estimated estimated return rate to achieve the predetermined target rate of return have.

According to another aspect of the present invention, there is provided a system for integrally managing an ESS, comprising: a plurality of ESSs; a communication unit for communicating with a plurality of ESSs; Calculating a total dischargeable capacity of a plurality of ESSs based on information received from the plurality of ESSs through the communication unit, comparing the calculated total dischargeable capacity with a participation contract capacity for DR, It is possible to control the communication unit to transmit the systematic discharge command to a plurality of ESSs included in the ESS.

Here, if the total dischargeable capacity as a result of the comparison is equal to or greater than the DR participation contract capacity, the control unit determines power rate reduction benefits for each of the plurality of ESSs, The ESS of the plurality of ESSs may be summed to correspond to the DR participation contract capacity in accordance with the first sort order and the communication unit may be controlled to transmit the system discharge command to each ESS included in the sum .

When the total dischargeable capacity is less than the DR participation contract capacity as a result of the comparison, the controller calculates an additional required capacity excluding the entire dischargeable capacity from the DR participation contract capacity, and calculates at least one of the charging charge and the battery capacity of each of the plurality of ESSs And the chargeable capacity of each of the plurality of ESSs is summed so as to correspond to the additional required capacity in accordance with the second sort order, And to control the communication unit to transmit the system discharge command to the ESS included in the total dischargeable capacity and to the ESS corresponding to the charge command.

According to the embodiment of the present invention as described above, the customer does not need to construct the ESS itself, and can provide the installation place only without the initial cost and use the ESS related facilities and related services built by the administrator.

In addition, the administrator can reliably recover the cost of constructing the ESS and secure a long-term revenue source by utilizing the ESS.

Also, according to the embodiment of the present invention as described above, the integrated management system of the ESS enables profit generation by participating in the DR, secures the stable power required for the DR, .

According to the embodiment of the present invention as described above, the ESS integrated management system performs DR participation using an ESS having a relatively low charge rate or an ESS having a large build capacity, thereby assuring stable power, It is possible to reduce the required cost and to expect an efficient charging / discharging effect.

1 is a block diagram illustrating a configuration of an ESS integrated management system according to an embodiment of the present invention.
2 is a block diagram illustrating the configuration of a server of an ESS integrated management system according to an embodiment of the present invention.
FIG. 3 and FIG. 4 are diagrams for explaining a control procedure for allocating the investment amount and the profit of the ESS by the server of the integrated ESS integrated management system according to the embodiment of the present invention.
5 and 6 are flowcharts illustrating a power supply control method of an ESS integrated management system by a server according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains.

1 is a block diagram showing a configuration of an ESS integrated management system 1 according to an embodiment of the present invention.

1, the ESS integrated management system 1 according to an embodiment of the present invention includes a server 100, a plurality of ESSs (Energy Storage System) 100 connected to the server 100 through a communication network 300, (210, 220, 230).

Each ESS 210, 220 and 230 includes a PCS (Power Conditioning System) 211, a BMS (Battery Management System) 212, a battery 213 and an EMS (Energy Management System) Although FIG. 1 illustrates the configuration of the ESS 210 as an example, the ESSs 220 and 230 also include PCS, BMS, battery, and EMS as components.

In FIG. 1, three ESSs 210, 220 and 230 are included in the system 1, but the ESS integration management system 1 according to the embodiment of the present invention includes a plurality of ESSs 210, The number of managed ESSs is not limited.

The PCS 211 supplies energy to the power load or the battery 213, discharges the battery 213, and supplies the stored energy to the power unit or the power grid to perform power management.

The electric power load is a target facility that receives commercial power supplied from a power plant through a power grid, and includes facilities such as a general building, an apartment, and a factory. In one embodiment, the PCS 211 may be configured to charge a commercial power source with a battery 213 and discharge it to a corresponding target facility if necessary.

The BMS 212 is for managing the battery 213. The BMS 212 senses the voltage, current, and temperature of the battery to control the charge / discharge amount of the battery 213 to an appropriate level, Balancing is performed and the remaining amount of the battery 213 is grasped. In addition, the BMS 212 protects the battery 213 through an emergency operation when a danger is detected.

The battery 213 functions as an energy storage for storing the energy supplied by charging the power supplied through the power network and an energy source for supplying the stored energy through the discharge to the power network. In one embodiment, the battery 213 may be a rechargeable secondary battery, and may be made of lithium ion, sodium sulfide, or the like as a main material.

The EMS 215 controls the PCS 211 to manage power management in the power system of each ESS 210, 220, 230. The EMS 215 predicts the power consumption of the ESS 210 installed in each ESS 210, 220 and 230 by controlling the PCS 211, To operate the electric power. In one embodiment, the EMS 215 may receive commands from the server 100 and control charging / discharging of the battery 213 via the PCS 211.

The EMS 215 includes a wired / wireless communication module (not shown) that enables communication with the server 100. The communication module can support at least one of various communication methods such as a LAN (Local Area Network), a wireless LAN, a WiFi, a Bluetooth, and a Wifi Direct. In the embodiment of the present invention, the communication method between the server 100 and the ESSs 210, 220, and 230 is not limited.

In one embodiment, the server 100 may be communicatively coupled to each ESS 210, 220, 230 via a dedicated communication network 300 for security purposes.

The ESS integrated management system 1 according to the embodiment of the present invention is constructed and managed by an ESS provider (hereinafter, also referred to as a service provider, an administrator, or an operator).

The server 100 is operated by the manager and builds / installs and integrally manages each ESS 210, 220 and 230 according to a request from a customer (e.g., a corporation, an apartment, a public institution, etc.). The installation cost for the ESSs 210, 220, and 230 is borne by the administrator, and installation space is provided by the customer.

For example, when a request for establishing an ESS 210 from a company A is received by the manager, the manager sends an ESS 210 facility including the PCS 211, the BMS 212, the battery 213 and the EMS 215 (Factory, building, etc.) provided by Company A. The administrator manages the ESS 210 installed through the server 100.

Similarly, the administrator can install and manage the ESS equipment 220, 230 at a predetermined place according to a request from the customer.

The server 100 of the ESS integrated management system 1 according to the embodiment of the present invention integrally manages the ESSs 210, 220 and 230 constructed by the administrators to provide a solution for energy saving for each customer, The administrator receives at least a portion of the energy savings (electricity cost savings) generated by utilizing the ESS in the management process as an investment cost corresponding to the ESS establishment cost.

In one embodiment, the server 100 may be implemented as an ESS Total Monitoring Server (ETMS) that integrally manages all the ESSs 210, 220, and 230.

2 is a block diagram showing the configuration of the server 100 of the integrated ESS integrated management system 1 according to an embodiment of the present invention.

As shown in FIG. 2, the server 100 includes a communication unit 110, an input unit 120, a display unit 130, a storage unit 140, and a control unit 150.

The communication unit 110 performs data communication with the ESSs 210, 220, and 230 through the communication network 300 and transmits and receives information to and from the ESSs 210, 220, and 230. In one embodiment, the communication unit 110 may further perform communication with another external device (e.g., a manager's terminal device (smart phone, PC, etc.), a power company server, etc.).

The input unit 120 may include various input devices such as a keyboard, a mouse, and the like, which are provided to be capable of receiving input from an administrator and can be operated by a user. In one embodiment, the input unit 120 may include a graphical user interface (GUI) including menu items displayed on the display unit 130.

The display unit 130 displays an image including the GUI. The display unit 130 may display an image enabling the integrated monitoring of each ESS 210, 220, and 230. In one embodiment, the display unit 130 includes a touch screen that senses a touch input to the GUI.

The method of implementing the display unit 130 is not limited and may be implemented by various display methods such as liquid crystal, plasma, light emitting diode, and organic light emitting diode .

The storage unit 140 stores unlimited data under the control of the controller 150. [ The storage unit 140 may include a nonvolatile memory, a volatile memory, a flash memory, a hard disk drive (HDD), or a solid state drive (SSD). The storage unit 140 is accessed by the control unit 150, and the control unit 150 reads / writes / modifies / deletes / updates the data.

The data stored in the storage unit 150 includes, for example, an operating system for driving the server 100, various applications executable on the operating system, image data, additional data, and the like. The storage unit 140 stores data / information acquired from each of the ESSs 210, 220, and 230 through the communication unit 110.

In the storage unit 140 of the server 100 according to the embodiment of the present invention, at least one program (software) for providing a customer-specific energy saving solution in which integrated monitoring and ESS of the plurality of ESSs 210, 220, ) Can be installed and stored.

The control unit 150 performs control operations for various configurations of the server 100. FIG. Specifically, the control unit 150 controls the overall operation of the server 100 and the signal flow between the internal components 110 to 140, and performs a function of processing data.

The control unit 150 receives status information including the charge / discharge amount of the battery 213 from each ESS 210, 220 and 230 through the communication unit 110 and displays it on the display unit 130 for integrated monitoring Or to an external device (for example, an administrator terminal device) via the communication unit 110. [

The control unit 150 receives various commands for controlling the ESSs 210, 220 and 230 through the communication unit 110 according to the operation of the program for the customer-specific energy saving solution. To the EMS 215. The commands transmitted to the ESSs 210, 220, and 230 include a grid discharge command for DR participation, which will be described later.

In one embodiment, the controller 150 is implemented as at least one processor such as a CPU (Central Processing Unit), an AP (Application Processor), a microcomputer (MICOM) (RAM), which is a volatile memory, and executes the program corresponding to the predetermined algorithm stored in the RAM 100 to perform various operations of the server 100. [

The controller 150 of the server 100 according to an exemplary embodiment of the present invention determines a payback period and a payback ratio for the ESS 210 included in the ESS integrated management system 1 do. The manager receives the amount corresponding to the recovery rate during the determined recovery period from the reduction in the electric power cost of the customer (company A) due to the use of the corresponding ESS 210. [

Then, the control unit 150 further determines the profit distribution ratio after the payback period of the ESS establishment cost has elapsed. Accordingly, after the payback period has elapsed, the administrator receives an amount corresponding to the determined allocation ratio from the cost savings of the customer (company A) based on the use of the ESS 210.

FIG. 3 and FIG. 4 are diagrams for explaining a control procedure for allocating the investment amount and profit of the ESS by the server 100 of the integrated ESS integrated management system 1 according to an embodiment of the present invention.

3, in the ESS integrated management system 1 according to the embodiment of the present invention, when building of the ESS 210 is completed at a predetermined place by the manager according to the request of the customer, The controller 150 determines a payback period (n) and a payback ratio (R) for maintaining the establishment cost (investment amount) for the corresponding ESS 210 to the administrator during a subsequent operation period (S410). Here, the payback period is a predetermined period (for example, several years) of the project initial year.

In addition, the recovery ratio R may be set to, for example, 0.8, corresponding to the utilization effect of the ESS 210 in question. Here, 0.8 is determined as the most common allocation rate for the collection rate, and can be changed depending on the characteristics of the customer who installed the ESS.

The recovery ratio R may be set based on at least one of the building capacity of the ESS and the customer's power usage pattern.

The predetermined number of ratios may be matched and stored in the storage unit 140 of the server 100 based on the ESS building capacity and the power usage pattern of the customer. It is possible to load the corresponding value and determine it as the recovery ratio (R).

For example, the storage unit 140 may store and set a recovery ratio corresponding to the capacity of the ESS as shown in Table 1 below.

Build Capacity Less than 00 Building capacity
00 or more and less than 00 Building capacity
00 or more and less than 00 Building capacity
00 or more and less than 00 Building capacity
00 or more manager 50 60 70 80 90 customer 50 40 30 20 10 Recovery rate (R) 0.5 0.6 0.7 0.8 0.9

A recovery ratio (R) of 0.8 indicates that 80% of the customer's electric power savings due to use of the ESS 210 is distributed to the administrator and 20% to the customer. In one embodiment, the burden ratio of the administrator can be set to be higher as the ESS establishment capacity is higher as shown in Table 1.

In another embodiment, the recovery ratio may be set and stored in the storage unit 140 according to the power usage pattern of the customer.

For example, customers' power usage patterns can be classified as follows.

Pattern 1: Industrial facilities such as factories

Pattern 2: Office (financial institution, government agency, etc.)

Pattern 3: Apartment-like housing

Here, the classification of the power usage pattern is not limited to the patterns 1 to 3 described above, and various other patterns may be added / modified. In addition, even the same pattern can be subdivided by industry. For example, in the case of the plant of pattern 1, it can be variously classified according to the characteristics of electric power use of the industry such as electronics, automobile, textile, chemical, shipbuilding,

An example of the recovery ratio (R) set corresponding to the customer's power usage pattern is shown in Table 2 below.

Factory 1 Factory 2 office Apartment manager 90 80 70 60 customer 10 20 30 40 Recovery rate (R) 0.9 0.8 0.7 0.6

In one embodiment, as shown in Table 2, the burden ratio of the manager can be set high for a customer who is expected to have a high ESS utilization effect, that is, a factory.

Here, in the case of a residence such as an apartment, the recovery ratio R can be set by a policy consideration. In other words, it is also possible to implement the method in which the burden ratio of the customer is intentionally lowered, for example, by setting the recovery ratio (R) to 0.9, so that the ESS construction of the apartment is activated by the system to induce electricity saving of the household Do.

As shown in FIG. 4, the operating period (Y) of the ESS 210 from Y ₁ to Y _n When the charge power savings of up to as S ₁ to S _n, number of periods (n) is determined by the following equation (1).

Here, C represents the total business cost, i.e., the total cost, required for the administrator to construct the ESS 210, and R may be set to 0.8 as a predetermined number of times, for example. The controller 150 determines an integer having the smallest value satisfying the expression (1) as n.

In one embodiment, the power cost savings S ₁ through S _n Is the sum of the basic charge savings and the electricity charge savings. The base rate reduction is calculated by multiplying the base peak rate by the maximum peak capacity (kW) per year, and by using the ESS 210, the base peak rate can be reduced by lowering the peak peak capacity. Reducing the amount of electricity will save you money by the amount of the difference according to the rate plan. Table 3 below shows an example of the basic rate unit price and the rate-based payment plan (industrial high-pressure A selection II standard).

Basic charge Fee per revelation summer spring fall winter Light load 56.1 56.1 63.1 8320 Intermediate load 109 78.6 109.2 Maximum load 191.1 109.3 166.7

In another embodiment, the power cost savings S ₁ through S _n May be determined by further considering an ESS exclusive tariff according to the consultation between the customer or the manager and the utilities.

Generally, electric power companies set the price of electric power charges higher during the week when the electric power consumption is high, and lower the electric power charge price at the nighttime when the electric power consumption is low (night electricity).

Therefore, in a method of charging the battery 213 provided in the ESS 210 at a light load time with a low electric power unit price and discharging the electric power stored in the battery 213 instead of the commercial power at a maximum load time when the electric power unit price is high It is possible to reduce electric power charges. That is, since the amount of power supplied from the commercial power source can be reduced by the amount of power supplied from the ESS 210, a reduced amount of power charges can be saved.

Here, the electric power charge system imposed by the utility company is composed of the sum of the basic charge and the usage charge (electric charge charge). That is, in addition to the usage fee corresponding to the amount of electricity actually used by the target facility, the base charge multiplied by the contract classification standard unit price is applied based on the maximum peak capacity per year.

Accordingly, it is necessary to reduce the standard charge based on the maximum peak capacity in addition to the charge based on the power consumption.

In the integrated management system 1 according to the embodiment of the present invention, the server 100 performs optimized operation control for each ESS 210, 220, and 230, thereby simultaneously achieving power usage control and maximum peak capacity control, Reduce the electricity consumption and reduce the electricity consumption.

Accordingly, the estimated electric power cost savings S1 to Sn for the predetermined ESS 210 are calculated, and the calculated value is used to calculate the recovery period (n) of the equation (1).

The control unit 150 determines the payout ratio (R) according to the use of the ESS 210 after the determined payback period (n) has elapsed P) (S420). Here, the determined distribution ratio P is calculated as Y _n Is applied from the (Y _{n + 1)} -th interval since the elapsed time is determined by the following equation (2).

G is the amount for achieving the target business performance after the completion of investment recovery and is calculated by analyzing the internal rate of return (IRR) and net present value (NPV). That is, the ESS 210 is operated through the server 100 to estimate the future expected profit for the customer by year, estimates and deducts the cost (incidental cost) expected to occur in the process by year, (For example, 4%, 8%, etc.) can be achieved.

M is determined as the sum of the rates Y _n power savings is the intervals after the lapse that is, estimated from Y _{n + 1} intervals.

In one embodiment, the storage unit 140 of the server 100 may store algorithms (e.g., mathematical expressions) for calculating G and M in accordance with the characteristics of the customer, The distribution ratio P can be determined by applying the calculated G and M to Equation (2). Here, the controller 150 calculates G and M for a period from Y _{n + 1} to a predefined interval, and the predetermined interval (for example, Y ₁₄ ) is a normal ESS usage period, The contract period, and the like. In one embodiment, the distribution ratio P may be determined to be 20%.

When the collection period (n), the collection ratio R and the distribution ratio P are determined as described above, the control unit 150 of the server 100 determines, based on the determination result of steps S410 and S420, (S430). ≪ / RTI >

In this process, the amount corresponding to the recovery rate R (for example, 80%) is allocated to the manager from the electricity price reduction amount S generated by using the ESS 210 every year from Y ₁ to Y _n , So that the manager can retrieve all the money from the customer for the construction of the ESS 210 during the payback period (n).

In addition, the amount corresponding to the allocation ratio P (for example, 20%) is allocated to the manager from the electricity cost saving amount S generated by utilizing the ESS 210 every year from the period of Y _{n + 1} . Accordingly, after the payback period (n) has elapsed, the administrator can receive a portion of the proceeds from the utilization of the ESS 210 from the customer, thereby securing a long-term revenue source.

Table 4 below shows an example of a criterion for distributing electric power charge savings to a predetermined customer (company A) according to the above embodiment.

division Years 1-5 Years 6-14 manager 80% 20% Company A 20% 80%

Referring to Table 4, it can be seen that the collection period (n) for the company A is 5 years, the collection ratio (R) is 80%, and the distribution ratio (P) is 20%.

Table 5 below shows an example of the estimated electricity cost savings (savings) by company A based on the criteria shown in Table 4 by year.

In millions of Korean won Company A's ESS introduction effect (based on 2MWh, operation for 14 years, reflected in battery efficiency degradation) division Sum Electricity cost savings
(customer) Year 1 350.69 70.14 Year 2 348.96 69.79 Year 3 167.04 33.41 4th year 166.20 33.24 5th year 165.37 33.07 6th year 164.54 131.64 7th year 163.72 130.98 8 years 162.90 130.32 9th year 162.09 129.67 10 years 100.84 80.67 11th year 100.33 80.27 12 years 99.83 79.86 13 years 99.33 79.47 14 years 98.84 79.07

According to the embodiment of the present invention described above, the customer does not need to construct the ESS 210 itself, and only provides the installation place without the initial cost and saves electric power charges by using the ESS related facilities and related services built by the manager Effect can be obtained. In addition, the administrator can reliably recover the cost required for constructing the ESS 210 and secure a long-term revenue source by utilizing the ESS 210.

Meanwhile, according to an embodiment of the present invention, the server 100 monitors a plurality of ESSs 210, 220, and 230 during the operation of the ESS integrated management system 1 in step S430, The efficiency of power-saving can be increased.

In recent years, electric power companies are preparing systems such as Demand Response (DR), in which customers participate in the demand and resource trading market, in order to manage electricity demand so as not to exceed supply. That is, when the total power demand is high, the DR participation request is invoked to supply the electric power charged in the battery 213 of the ESS 210, 220, 230 to supplement the insufficient electric power supply amount of the electric power company, Of the cost of the power company. Therefore, it is also possible to reduce the electric power charge by using the ESS (210, 220, 230) in addition to the method of reducing the electric power consumption such as the basic charge and the usage charge, .

The amount of electric energy stored in each of the ESSs 210, 220 and 230 and the charging and discharging speed can be kept constant by the PCS 211, the BMS 212 and the EMS 215, The efficiency of saving electric power can be changed according to a method of distributing the electric energy stored in each ESS 210, 220,

Here, the server 100 according to an embodiment of the present invention can efficiently perform the entire system 1 including the ESSs 210, 220, and 230 to perform optimal ESS capacity allocation. In the present invention, an embodiment in which the system 1 is operated in such a manner that the charging and discharging of the ESS is controlled by participating in the DR to control the power supply will be referred to as an ESS DR power plant.

Hereinafter, a power supply control method according to the operation of the ESS integrated management system 1 by the server 100 will be described in detail with reference to the drawings.

5 and 6 are flowcharts showing a power supply control method of the ESS integrated management system 1 by the server 100 according to an embodiment of the present invention.

As shown in FIG. 5, the server 100 may receive an external input requesting a demand response, that is, a DR participation (S431). Here, the external input is generated in response to a request from a power company, and may be an operation on the input unit 120 of the server 100 or may be received from the external unit including the power company server through the communication unit 110.

In one embodiment, the DR participation request, that is, the power supply instruction command, may be received a predetermined time (e.g., one hour) before power is supplied from the corresponding ESS in response to a systematic discharge command described below.

In response to the external input reception in step S431, the control unit 150 calculates total TRE (Total Remain Elements) of the plurality of ESSs 210, 220, and 230 included in the system 1 (S432 ). Here, TRE is calculated by summing the dischargeable capacitances of the respective ESSs 210, 220, and 230. For example, if there are i ESSs in the system 1, the dischargeable capacity of the first ESS is A ₁ , the dischargeable capacity of the second ESS is A ₂ , the dischargeable capacity of the third ESS is A ₃ , If the dischargeable capacity is A _i , TRE is calculated by the following equation (3).

In one embodiment, the dischargeable capacity A _i of the i-th ESS may be the total amount of energy currently charged in the battery of the corresponding ESS. It can discharge in the i-th ESS In another embodiment capacity A _i is now the minimum reference capacitance preset in the total amount of charged energy to the battery of the ESS (for example, a few kW to a few% of the total amount), remaining number of days capacity except have.

The controller 150 compares the TRE calculated in step S432 with the DR participation contract capacity (S433). Here, the DR participation contract capacity can be determined by a contract between the manager of the system 1 and the utility company.

According to the comparison result of step S433, if the calculated TRE is equal to or greater than the DR participation contract capacity, the control unit 150 determines the electric power saving benefit for each of the plurality of ESSs 210, 220, 230 in the system 1 ( S434). Here, the electric power saving benefit for each of the plurality of ESSs 210, 220, and 230 can be estimated using the above-described peak capacity reduction and rate-based charging, and the respective ESSs 210, 220, and 230 The resulting savings can be a profit. For example, the ESS 210 having a high power-saving benefit has a large charge / discharge effect of the ESS.

The control unit 150 sorts or sorts a plurality of ESSs 210, 220 and 230 in the order of decreasing power tariff reduction profit determined in step S434 (S435). Here, the plurality of ESSs 210, 220, and 230 may be arranged according to the first sort order corresponding to the order in which the electric power saving benefit is low.

The control unit 150 sums the dischargeable capacities of the ESSs 210, 220, and 230 to correspond to the DR participation contract capacity in accordance with the sort order (first sort order) in step S435 (S436). That is, the controller 150 sequentially sums up the dischargeable capacities from the ESSs 210, 220 and 230 starting from the ESS having the lowest electric power saving benefit, and stops the summation when the summed capacity reaches the DR participation contract capacity . Here, a plurality of ESSs included in the summation become DR participation targets.

Then, the controller 150 controls the communication unit 110 to transmit the systematic discharge command to each ESS involved in the DR participation included in the sum in step S436 (S437). The ESSs receive a systematic discharge command from the server 100 via the EMS 215 and discharge electric power corresponding to the dischargeable capacity from each battery 213. The discharged electric power is supplied to the power exchange, To each load that needs it. Here, since the discharged electric power can be sold to the electric power market through the power exchange, it is possible to generate a profit of the customer accordingly.

According to the embodiment of the present invention as described above, the ESS integrated management system 1 can secure the stable power due to the DR participation and maintain the benefit of the customer with high power saving effect using the ESS.

6, if the TRE calculated according to the comparison result of step S433 is less than the DR participation contract capacity, the controller 150 calculates an additional required capacity EXTRA excluding the TRE from the DR participation contract capacity (S444) .

The control unit 150 aligns the plurality of ESSs 210, 220, and 230 according to the charging charge or battery capacity of each of the plurality of ESSs 210, 220, and 230 in the system 1 (S445). Here, the plurality of ESSs (210, 220, 230) may be arranged according to a second sort order determined based on at least one of respective charge rates and battery capacity.

In one embodiment, the controller 150 may arrange a plurality of ESSs 210, 220, 230 in order of charge (set) charging rates. Here, the charging fee may be different according to the time zone, and the controller 150 may sort the ESSs 210, 220, and 230 sequentially from the ESS having the lowest charging fee based on the current time when the DR participation request is received .

In another embodiment, the control unit 150 can arrange a plurality of ESSs 210, 220, and 230 in descending order of battery capacity (capacity).

In another embodiment, the controller 150 may align the plurality of ESSs 210, 220, and 230 in consideration of both the charge rate and the battery capacity.

For example, the control unit 150 may arrange the plurality of ESSs 210, 220, and 230 according to the charging charge, and sort the two or more ESSs having the same sorting charge rate according to the battery capacity.

As another example, the control unit 150 may sort the ESSs in the order of the lowest charge rate (for example, 20% of the total ESS) among all the ESSs, can do.

As another example, a second list in which the ESSs 210, 220, 230 are sorted according to the battery capacity and a first list in which the ESSs 210, 220, 230 are sorted in a charge- 220, 230 in a manner that weights each ESS to correspond to the rankings in the first list and the second list to generate a final ordered list.

The control unit 150 sums the chargeable capacities of the plurality of ESSs 210, 220, and 230 to correspond to the additional required capacity according to the sorting order (second sort order) in step S445 (S446). That is, the control unit 150 sums up the capacities that can be recharged to the current battery sequentially from the ESS having the highest priority in the sort list among the ESSs 210, 220, and 230, When the required capacity is reached, the summation can be stopped.

Then, the controller 150 transmits a charging command to the additional ESSs included in the sum of the step S446 (S447). The ESSs receive the charging command from the server 100 through the EMS 215 and charge the respective batteries 213. The status information of each ESS upon charging is transmitted to the server 100 through the ENS 215. [ Lt; / RTI > The server 100 can integrally monitor the charging status of each ESS based on the received status information.

When charging of the ESSs that have transmitted the command is completed in step S447, the controller 150 controls the communication unit (not shown) to transmit the system discharge command to the ESS included in the sum of the ESS included in the TRE calculated in step S4320 and the additional charging target ESS included in the sum of step S446 110 (S448). The ESSs receive a systematic discharge command from the server 100 via the EMS 215 and discharge electric power corresponding to the dischargeable capacity from each battery 213. The discharged electric power is supplied to the power exchange, To each load that needs it.

According to the embodiment of the present invention as described above, in the ESS integrated management system 1, since the charging fee relatively participates in the DR using the ESS or the ESS having the large building capacity, It is possible to reduce the required cost and to expect an efficient charging / discharging effect.

On the other hand, various embodiments of the present invention as described above can be implemented by a computer-readable recording medium or a program stored in a recording medium. The recording medium includes a storage medium for storing data readable by a computer. The program is code that can be read and executed by the processor, and includes code for causing the controller 150 to perform operations such as the steps shown in Figs. 3, 5 and 6. The program may be embodied in software that includes an operating system or a program / application provided in the server 100 and / or software that interfaces with an external device.

Various embodiments of the present invention may be implemented by a combination of hardware and software. As hardware, a processor may include a non-volatile memory in which a computer program, which is software, is stored, a RAM into which a computer program stored in a non-volatile memory is loaded, and a CPU that executes a computer program loaded in the RAM. Non-volatile memory includes, but is not limited to, a hard disk drive, flash memory, ROM, CD-ROMs, magnetic tapes, floppy disks, optical storage, The non-volatile memory is an example of a computer-readable recording medium on which a computer-readable program of the present invention is recorded.

1: ESS Integrated Management System 100: Server
110: communication unit 120: input unit
130: display unit 140:
150: control unit 210, 220, 230: ESS
211: PCS 212: BMS
213: Battery 215: EMS
300: Network

Claims (7)

A power supply control method using charge / discharge of an ESS (Energy Storage System)
Receiving an external input requesting participation of a demand reaction (DR);
Calculating a total dischargeable capacity of the plurality of ESSs based on information received from the plurality of ESSs;
Comparing the calculated total dischargeable capacity with the participation contract capacity for the DR;
And transmitting a grid discharge command to a plurality of ESSs included in a DR participation target based on the comparison result. The method according to claim 1,
Determining a power charge saving benefit for each of the plurality of ESSs when the total dischargeable capacity is equal to or greater than the DR participation contract capacity;
Arranging the plurality of ESSs according to a first sorting order corresponding to a lower order of the power charge saving benefits;
Summing the dischargeable capacity of each of the plurality of ESSs to correspond to the DR participation contract capacity according to the first sorting order;
Further comprising transmitting a system discharge command to each ESS included in the summation. The method according to claim 1,
Calculating an additional required capacity excluding the total dischargeable capacity from the DR participation contract capacity when the total dischargeable capacity is less than the DR participation contract capacity as a result of the comparison;
Arranging the plurality of ESSs according to a second sort order determined based on at least one of a charge rate and a battery charge of each of the plurality of ESSs;
Summing a chargeable capacity of each of the plurality of ESSs to correspond to the additional required capacity according to the second sort order;
Transmitting a charge command to each ESS included in the summation;
Further comprising transmitting a system discharge command to an ESS included in the total dischargeable capacity and to an ESS corresponding to the charge command. The method of claim 3,
Wherein the aligning the plurality of ESSs according to the second sort order comprises:
Wherein the plurality of ESSs are sorted according to the charge rate, and the two or more ESSs having the same sorting charge rate are sorted according to the battery capacity. In a system for integrated management of an ESS (Energy Storage System)
A plurality of ESSs;
A communication unit for performing communication with the plurality of ESSs,
In response to receipt of an external input requesting participation of a demand reaction (DR), calculating a total dischargeable capacity of the plurality of ESSs based on information received from the plurality of ESSs via the communication unit, And a controller for comparing the available capacity with the participation contract capacity for the DR and controlling the communication unit to transmit the grid discharge command to a plurality of ESSs included in the DR participation target based on the comparison result Features integrated ESS management system. 6. The method of claim 5,
Wherein the controller determines a power charge reduction profit for each of the plurality of ESSs when the total dischargeable capacity is equal to or greater than the DR participation contract capacity as a result of the comparison, Arranging the plurality of ESSs according to the order and summing the dischargeable capacities of each of the plurality of ESSs to correspond to the DR participation contract capacity according to the first sorting order, And the control unit controls the communication unit to transmit the ESS. 6. The method of claim 5,
Wherein the control unit calculates an additional required capacity excluding the entire dischargeable capacity from the DR participation contract capacity when the total dischargeable capacity is less than the DR participation contract capacity as a result of the comparison, Battery capacity; summing the chargeable capacity of each of the plurality of ESSs to correspond to the additional required capacity in accordance with the second sort order; Wherein the control unit controls the communication unit to transmit a charge command to each ESS included in the sum and to transmit a system discharge command to an ESS included in the total dischargeable capacity and an ESS corresponding to the charge command. system.

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