KR20190093034A - ESS Output Distribution Method and Apparatus thereof - Google Patents

Abstract

The present invention relates to an energy storage system (ESS) output distribution method, which determines discharge division of each of a plurality of unit ESSs in a structure of connecting the plurality of unit ESSs to a system, comprising the steps of: calculating a maximum discharge maintaining time of each of the unit ESSs based on charge state information of each of the unit ESSs; determining first discharge division in accordance with the maximum discharge maintaining time; confirming final discharge division as the maximum power which can be supplied to the unit ESS for which discharge power in accordance with the determined first discharge division exceeds the maximum power which can be supplied; and determining second discharge division in accordance with the maximum discharge maintaining time for the residual unit ESS except the corresponding unit ESS when the unit ESS of which the final discharge division is confirmed exists.

Description

ESS Output Distribution Method and Apparatus

The present invention relates to a method and apparatus for operating an ESS, and more particularly, to a method and apparatus for distributing power with optimum efficiency in a large-scale ESS having two or more unit ESSs.

Smart grid technology that combines IT technology with the existing power grid is emerging to form a smart power grid through efficient power management of electric power facilities, industrial facilities, and private facilities.

The smart grid environment is a hybrid network that combines various devices and combines wired and wireless. For example, the smart grid communication network construction method uses broadband wireless communication (Wimax) for trunk lines and high-speed power line communication (PLC) for subscriber networks. Management, electric vehicles, solar equipment monitoring, etc.) is being improved.

The smart grid system aims to save power, and generally uses a method of turning on / off a specific device as shown in Korean Patent Laid-Open No. 2012-0097551 for power saving. However, existing smart grid systems do not provide an appropriate way of distributing energy to efficiently use the supplied energy.

Energy storage system (ESS) can play a key role in linking smart grid after converting renewable energy sources, which are being actively developed, into high quality power. In particular, it is necessary to link wind power generation and solar power generation systems with high output variability to the grid.

The principle of energy storage is to receive electrical energy from the power system, store it as ionization, kinetic energy, physical compression and chemical energy, convert it into electrical energy when needed, and supply it to the power system. Medium and large energy storage devices can be classified into various types. Lithium ion battery is a representative secondary battery, there is a separator and an electrolyte between the positive electrode and the negative electrode to store and discharge energy as lithium ions move. Although it is still economically disadvantageous, its output characteristics and efficiency are good, and its range of application has recently been widened. In particular, a plurality of unit BESSs having a battery pack composed of lithium ion batteries are provided for a single target site. In this way, the disadvantages of economics and the lifespan of lithium ion battery life are compensated for.

However, the charge / discharge power distribution of the entire ESS including a plurality of unit BESS requires a different method from the ESS having a single battery pack.

For example, in case of frequency regulation (FR) operation, operation continues below the rated frequency as the frequency rises or falls, but the power is output at the maximum output at the moment of an accident (for example, in the case of one nuclear power plant failure). Discharge should contribute to system limitation.

However, when a plurality of different MWh batteries and different MW ESS PCSs are connected to each other, the operation of the ESS PCS with high efficiency but low battery capacity is exhausted first. Then, when it is necessary to send power to the maximum output in the event of an accident, there is a problem that the maximum output cannot be satisfied due to SOC exhaustion of the ESS system.

Republic of Korea Patent Publication No. 2012-0097551

An object of the present invention is to provide an efficient ESS output distribution method and apparatus when a plurality of unit ESSs are provided.

An object of the present invention is to provide a method and apparatus for distributing an ESS output capable of maximally maintaining a maximum output duration for a plurality of ESSs having different discharge rates and output limits.

An ESS output distribution method according to an aspect of the present invention includes calculating a maximum discharge holding time of each unit ESS based on state of charge information of each unit ESS; Determining a first discharge sharing in accordance with the maximum discharge holding time; Determining a final discharge share as the maximum power that can be supplied for a unit ESS whose discharge power according to the determined first discharge sharing exceeds a maximum power that can be supplied; And when the unit ESS in which the final discharge sharing is determined exists, determining the second discharge sharing according to the maximum discharge holding time with respect to the remaining portions other than the corresponding unit ESS.

Here, the method may further include determining a power demand of the grid or a load connected to the grid.

In the determining of the second discharge sharing, the second discharge sharing may be determined with respect to the power obtained by subtracting the sharing power of the unit ESSs in which the final discharge sharing is determined from the power demand.

Here, in the step of calculating the maximum discharge holding time of each unit ESS, the current remaining charge is calculated by applying the current SOC to the battery maximum capacity of each unit ESS, and the maximum power available for supplying each unit ESS to the current remaining charge is calculated. The maximum discharge holding time can be calculated by applying.

Here, after the step of determining the second discharge sharing, the step of determining the final discharge sharing as the maximum power available for the unit ESSs that are the determination target of the second discharge sharing, and as a result, the If there is a unit ESS in which the final discharge sharing is determined to be the maximum power that can be supplied, the third discharge sharing may be determined according to the maximum discharge holding time with respect to the rest other than the corresponding unit ESS.

An ESS output distribution device according to another aspect of the present invention, in the ESS output distribution device for determining the discharge sharing of each unit ESS in a structure in which a plurality of unit ESS is connected to the system, for the power demand of the system and the unit ESS An information obtaining unit obtaining the charging state information; A storage unit in which charge state information and maximum supply power of the unit ESSs are recorded; Based on the charging state information of each unit ESS, the maximum discharge holding time of each unit ESS is calculated, the discharge sharing for determining the discharge power of the respective unit ESS, based on the calculated maximum discharge holding time of each unit ESS Decision unit; And a controller for instructing output to the determined discharge powers for each unit ESS and scheduling a next output distribution.

Here, the process of determining respective discharge powers may include: determining a first discharge share according to the maximum discharge sustain time; Determining a final discharge sharing as the maximum power that can be supplied, when the discharge power according to the determined first discharge sharing exceeds the maximum power that can be supplied; And determining a second discharge sharing in accordance with the maximum discharge holding time for the remaining devices except for the device for which the discharge power is determined as the maximum power that can be supplied.

By implementing the ESS output distribution method and apparatus of the present invention as described above, there is an advantage that can maintain the maximum possible duration of the maximum output for a plurality of ESS having different discharge rate and output limit value.

By using the output distribution method and apparatus according to the spirit of the present invention, the maximum power maintainable time of N batteries can be maintained equally, thereby increasing the overall utilization of the battery, and consequently, the overall utilization of the ESS from the perspective of the ESS user. There is an advantage to increase.

The ESS output distribution method and apparatus of the present invention have the advantage that the entire ESS can be operated all at once with the maximum output in case of emergency while faithfully following the low load operation command value at all times, which is advantageous in terms of responsiveness. .

1 is a block diagram showing the overall structure of a large-scale ESS in which the ESS output distribution method according to the spirit of the present invention can be performed.
FIG. 2 is a block diagram illustrating an ESS output distribution apparatus for performing an ESS output distribution method according to the inventive concept in the large-scale ESS of FIG. 1.
3 is a flowchart illustrating a method of distributing ESS output according to an embodiment of the present invention.
4 is a conceptual diagram illustrating a process of distributing an output based on SOC and maximum charging capacity of each unit ESS according to the spirit of the present invention, that is, a method of operating the ESS maximum duration according to the spirit of the present invention.

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

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. The terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When a component is referred to as being connected or connected to another component, it may be understood that the component may be directly connected to or connected to the other component, but there may be other components in between. .

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

In this specification, the terms including or including are intended to designate that there exists a feature, a number, a step, an operation, a component, a part, or a combination thereof described in the specification, and one or more other features or numbers, It can be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

In addition, the shape and size of the elements in the drawings may be exaggerated for more clear description.

First, before describing the ESS output distribution method according to the spirit of the present invention, the definition of the large-scale ESS, unit ESS and ESS output distribution device.

The idea of the present invention is to distribute two or more individual ESSs for the optimal charging power for the power system. The two or more individual ESSs are called a large-scale ESS, and each individual ESS is called a unit ESS. I'll call it. Here, it is suitable for each unit ESS to have its own PCS in the application of the idea of the present invention.

The large-scale ESS is not called a large-scale because the absolute scale is above a certain limit, but means that the large-scale ESS is larger than each unit ESS. For convenience of description, the large-scale ESS may simply be referred to simply as the ESS.

The ESS output distribution device is a strategy (algorithm) according to the spirit of the present invention, and is a device (server, etc.) for controlling the output of each PCS of each unit ESS.

For example, the ESS output distribution device is an output control server for the large-scale ESS, and may transmit an output command for discharge to the PCS of each unit ESS included in the large-scale ESS.

For example, the ESS output distribution device may be integrated with the PCS of the master unit ESS of the large-scale ESS, and may transmit an output command for discharge to the PCS of the slave unit ESS of the large-scale ESS.

1 shows the overall structure of a large-scale ESS in which the ESS output distribution method according to the spirit of the present invention can be performed.

In a large-scale energy storage system (ESS) according to an exemplary embodiment, a real-time output distribution calculation of N parallel connected power conversion systems (PCSs) is performed by a power management system (PMS) of a large-scale ESS instead of a master PCS. Has That is, the illustrated PMS is an ESS output distribution device that is different from the spirit of the present invention.

Referring to FIG. 1, the illustrated large-scale ESS is composed of a plurality of unit ESSs 100 connected in parallel, and each unit ESS 110 is a PCS 110 and a battery management system (BMS) connected to the PCS 110. 120 and the battery 140 may be implemented. In addition, each PCS 110 may be controlled using a PMS 150.

The BMS 120 may be included in the battery module. The BMS 120 may control the operation of the battery by acquiring basic data for checking the state of the battery 140. In order to secure the safety of the battery 140, the voltage, current, and temperature of the battery 140 may be sensed to transmit information to an upper device through communication. These functions are the information needed to safely operate the energy storage device. The host device PCS 110 or PMS 150 can use this information to check the operating state and malfunction of the battery, and protect the battery module from abnormal conditions through a circuit that protects overvoltage, overcurrent and overtemperature. have.

The PCS 110 may be implemented to perform power supply to a load using a commercial power source. In addition, when power is generated and generated from a generator (not shown) such as solar power or wind power at the same time, power is stored (charged) in a lithium-polymer (lithium-ion) battery storage device through a bidirectional power converter. can do.

The battery module may be a concept including the BMS 120 and the battery 140. The battery module is constructed using a lithium-polymer (lithium-ion) battery that has high efficiency, long life, and instant charging and discharging characteristics. The energy storage system has been remarkably developed due to the improvement of instantaneous charge and discharge characteristics of lithium-polymer batteries and the large capacity of the batteries.

In powering the load connected to the large-scale ESS, the PMS 150 can increase the overall utilization of the battery by equally maintaining the maximum output maintainable time of the N batteries by using the output distribution method, and consequently, the ESS user's viewpoint. Can increase the overall utilization of the ESS.

The PMS 150 may be implemented to communicate information necessary for energy charge and discharge control to the PCS 110 through communication with the PCS 110. The PMS 150 receives various information about the energy state of the PCS 110 and the BMS 120, battery cell voltage, current, and temperature, and determines a protection function for overvoltage, overcurrent, and overtemperature. Can be protected from abnormal conditions. In addition, the charging or discharging on / off signal of the battery module may be transmitted to the PCS 110 to command the charging or discharging of the battery module.

When the PMS 150 normally distributes the output command, the PMS 150 distributes the output command in a direction that maximizes the time at which the large-scale ESS can perform the maximum output operation in consideration of the output of the current SOC and PCS of each unit ESS.

In another implementation, not shown, a PMS for a large ESS is not provided, and the master PCS can perform real-time output distribution calculations of PCSs (ie those for each unit ESS) connected in parallel to the system of the large ESS. . Here, the master PCS is a PCS provided in one of the unit ESSs provided in the large-scale ESS.

FIG. 2 illustrates an example of a detailed structure of an ESS output distribution apparatus, that is, a PMS 150 that performs an ESS output distribution method according to the inventive concept in the large-scale ESS of FIG. 1.

The illustrated ESS output distribution device 150 includes: an information acquisition unit 152 for acquiring power demand (consumption state information) of the system to which power is supplied and charging state information for unit ESSs (100 of FIG. 1); A storage unit 154 in which charge state information (SOC and maximum charge capacity) and maximum supply power of the unit ESSs 100 are recorded; Based on the state of charge information of each of the unit ESS 100, calculate the maximum discharge holding time of each unit ESS 100, based on the calculated maximum discharge holding time of each unit ESS (100) A discharge sharing determiner 156 that determines discharge powers of the unit ESSs 100; And a controller 158 for instructing each of the unit ESSs 100 to output the determined discharge powers and scheduling a next output distribution.

The information acquisition unit 152 monitors the electrical characteristics (voltage / current, etc.) of the PCS 110 input / output terminals of the unit ESS 100 to calculate charging state information of the unit ESSs, or the units Charge status information may be received from the BMS 120 of the ESS 100. The charge state information may include a state of charge (SOC) and a maximum charge capacity, and may further include a state of health (SoH).

The information acquisition unit 152 calculates electrical characteristics (voltage, current, etc.) detected at points on a power supply line to a grid or a load, and thus information on power demand of a load connected to the grid, that is, power consumption. Information about the state can be calculated.

The storage unit 154 may store SOCs and maximum charging capacities of each unit ESS 100 measured at predetermined cycles (monitoring time intervals) as the charging state information.

The controller 158 may maintain a previous output instruction according to the monitoring time interval (that is, hold the change to the next time) or change the output instruction to output the discharge powers determined by the discharge sharing determiner 156. . According to an implementation, the controller 158 may not only output distribution between the unit ESSs 100 according to the spirit of the present invention, but also power input / output of each unit ESS 100 according to power demand / supply expectation of a system or a load. You can schedule the output.

The discharge sharing determiner 156 may determine a power demand of a grid or loads connected to the grid at the next monitoring time interval.

The discharge sharing determiner 156 may determine the discharge powers (final discharge sharing) of each unit ESS 100 according to the flowchart of FIG. 3 described later according to the monitoring time interval. At this time, the final discharge share of each unit ESS 100 is determined for the determined power demand in the monitoring time interval.

3 is a flowchart illustrating a method of distributing ESS output according to an embodiment of the present invention.

The illustrated ESS output distribution method may include determining a power demand of a grid or a load connected to the grid (S10); Calculating maximum discharge holding times of each unit ESS based on the state of charge information of each unit ESS (S110); Determining a first discharge sharing in accordance with the maximum discharge holding time (S120); Determining a final discharge share as the maximum power that can be supplied to the unit ESS whose discharge power according to the determined first discharge burden exceeds the maximum power that can be supplied (S130); If there is a unit ESS in which the final discharge share is determined (the discharge power is determined by the maximum power that can be supplied) (S190), determining the second discharge share according to the maximum discharge holding time for the remaining units except for the unit ESS ( S200) may be included.

4 is a conceptual diagram illustrating a process of distributing an output based on SOC and maximum charging capacity of each unit ESS according to the spirit of the present invention, that is, a method of operating the ESS maximum duration according to the spirit of the present invention.

In the conceptual diagram shown, the maximum operating time (MW) of each ESS converter and the SOC (MWh) of the battery are used to calculate the time that can be operated at the current maximum output, respectively, and the output using the reciprocal of this time as the priority. Allocate Next, if this allocation exceeds the maximum output of the ESS PCS (inverter or converter), the maximum output is determined as the limit discharge as the final discharge share of the ESS, and redistributed using the remaining allocation minus the final discharge share. If the above distribution is continued, it is always possible to maintain a state in which the maximum number of times that a plurality of ESSs can operate at the maximum output.

Hereinafter, detailed steps of FIG. 3 will be described, but will be described with reference to FIG. 4.

In the step S10 of determining the illustrated power demand, the power demand of the grid or loads connected to the grid may be determined at the above-described predetermined monitoring time interval.

For example, from the values of detecting electrical characteristics (voltage and / or current) at each point of the grid or load, calculate an expected value or slope (rate of increase or decrease) of the electrical characteristic at an upcoming monitoring time interval, and again. This can be used to calculate power demand.

For example, from the accumulated data on the previous power consumption activity of each load connected to the grid, the power consumption pattern of each load is derived, and the derived power consumption pattern is applied to the upcoming monitoring time interval, so as to adjust the power demand of the load. Forecast and accumulate the power demand forecasts for all loads to yield the system's power demand (expected).

For example, the power demand in an upcoming monitoring time interval may be determined from a separate external server that plans the power demand of the system or predicts the power demand of the system.

In the calculating of the maximum discharge holding times based on the state of charge information of each unit ESS shown (S110), first, a current amount of charge is applied by applying a current SOC to a battery maximum capacity of each unit ESS, and the current remaining amount is calculated. The maximum discharge holding time can be calculated by applying the maximum output of the PCS (ie, inverter) of each unit ESS to the amount of charge.

As shown in FIG. 4, the current remaining charge is calculated by multiplying the maximum capacity of the battery of each unit ESS by the current SOC (%), and the current remaining charge is the maximum of the PCS of the unit ESS (that is, the interversor). The time for discharging to the output (that is, the maximum discharge holding time) is calculated. For example, in the case of the first unit ESS (INV # 1) of FIG. 4, the maximum capacity of 5 MWh of the battery is multiplied by 50% as the current SOC, and 2.5 MWh is calculated from the remaining charge, and 2.5 MWh is 1 MW, the maximum output of the inverter. 2.5 hours (that is, 150 minutes), which is the discharge time, can be calculated as the maximum discharge holding time (the discharge time at the current maximum output).

In the determining of the first share of the discharge (S120), a synthesized output target value for determining the power demand of the grid or the loads connected to the grid determined in the step S10 is determined, and the combined output target value is determined solely for each unit ESS. By distributing at the ratio of the maximum discharge holding times, the first discharge share can be determined.

As shown in Fig. 4, the combined output target value of 8MW is distributed according to the ratio of the maximum discharge holding time (currently dischargeable time at the maximum output) of all the unit ESSs, and {4.597701, 1.83908, 0.91954, 0.45977, 0.183908}. The discharge share of was determined.

Next, for each unit ESS, check whether the discharge power according to the determined first discharge share exceeds the maximum power that can be supplied (S130), and when the maximum power is exceeded, discharge power for the corresponding unit ESS as the maximum power that can be supplied. Determine (S140).

In addition to performing the step S140, the corresponding unit ESS is excluded from the next discharge sharing determination procedure (S145). Here, the next discharge sharing determination procedure means the second discharge sharing determination step (S200).

 When the maximum power is not exceeded in step S130, the unit ESS is not taken for the corresponding unit ESS, and the process proceeds to the next unit ESS (S148).

In the drawing, the order of each unit ESS is represented by n, and the total number of unit ESSs is represented by N (that is, N is 5 in FIG. 4).

In FIG. 4, the first discharge sharing for the first unit ESS is 4.597701MW, which is greater than the inverter output of 1MW for the first unit ESS, and according to steps S140 and S145, the final discharge sharing for the first unit ESS is the maximum output of 1MW. Confirmed.

When the process of checking whether the discharge power according to the first discharge sharing exceeds the maximum power that can be supplied to all the unit ESSs (S130) and the follow-up actions (S140, S145, S148) according to the check is completed (S128), It is determined whether the discharge power according to the first discharge sharing among the ESSs exceeds the maximum power that can be supplied, and that there is a target (unit ESS) excluded from the next discharge sharing calculation target (S190).

In the determining of the second discharge sharing (S200), the second discharge sharing is determined only for the remaining unit ESSs except for the unit ESSs in which the final discharge sharing is determined. Here, the second discharge sharing is determined for the power obtained by subtracting the sharing power of the unit ESSs whose final discharge sharing is determined from the power demand.

In FIG. 4, the second discharge sharing is determined for 7MW minus the final discharge sharing 1MW of the first unit ESS (INV # 1) where the final discharge sharing is determined from 8MW of power demand (synthetic output target value), but the first unit ESS (INV) is determined. The second discharge share of {3.783784, 1.891892, 0.945946, 0.378378} was determined by determining the ratio of the maximum discharge holding times of units 2 to 5 except for # 1) {60: 30: 15: 6}.

Although the contents are not duplicated, with respect to the step S200 of determining the second discharge sharing (that is, after performing the step S200), for the unit ESSs for which the discharge sharing is determined, S128 shown in FIG. 3. , S130, S140, S145, S148, and S190 may be repeated.

That is, even after determining the second discharge sharing, for the unit ESS in which the determined second discharge sharing power is larger than the maximum supplyable power of the unit ESS PCS, the final maximum supplyable power of the unit ESS PCS is determined for the unit ESS. It is decided by discharge sharing.

In FIG. 4, the final discharge sharing of the second unit ESS (INV # 2) among the four unit ESSs in which the second discharge sharing is determined is determined to be 2MW of the maximum power that can be supplied by the corresponding ESS PCS (inverter).

Although not shown in FIG. 3, if unit ESSs for which final discharge sharing is not determined remain after performing the step of determining the second discharge sharing, the step of determining the third discharge sharing in the same process is performed on the remaining unit ESSs. Can be. Determining this next discharge share is performed until there are no unit ESSs whose final discharge share has not been determined.

In FIG. 4, since the third discharge sharing determined in the step of determining the third discharge sharing does not exceed the maximum available power of each unit ESS, the procedure is terminated, so that the third and fifth unit ESSs (INVs # 3 to 5) are terminated. The third discharge share is determined as the final discharge share.

By implementing the ESS output distribution method and apparatus of the present invention as described above, it is possible to maintain the maximum possible duration of maximum output for a large number of ESSs having different discharge rates and output limit values, and to maintain the constant low load operation command value. While faithfully following the emergency, the entire ESS can have the maximum time to operate all at once with the maximum output.

It should be noted that the above embodiment is for the purpose of illustration and not for the purpose of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

100: unit ESS 150: ESS output distribution device
152: information acquisition unit 154: storage unit
156: discharge sharing determining unit 158: control unit

Claims (7)

In the ESS output distribution method for determining the discharge sharing of each unit ESS in a structure in which a plurality of unit ESS is connected to the system,
Calculating a maximum discharge holding time of each unit ESS based on the state of charge information of each unit ESS;
Determining a first discharge sharing in accordance with the maximum discharge holding time;
Determining a final discharge share as the maximum power that can be supplied for a unit ESS whose discharge power according to the determined first discharge sharing exceeds a maximum power that can be supplied; And
If there is a unit ESS in which the final discharge sharing is determined, determining a second discharge sharing according to the maximum discharge holding time for the remaining units except for the corresponding unit ESS.
ESS output distribution method comprising a.
The method of claim 1,
Determining the power demand of the grid or loads connected to the grid
ESS output distribution method further comprising.
The method of claim 2,
In the determining of the second discharge sharing,
And a second discharge sharing is determined for the power obtained by subtracting the sharing power of the unit ESSs whose final discharge sharing is determined from the power demand.
The method of claim 1,
In the calculating of the maximum discharge holding time of each unit ESS,
ESS output distribution method for calculating the current remaining charge amount by applying the current SOC to the maximum capacity of the battery of each unit ESS, and calculating the maximum discharge holding time by applying the maximum power available to each unit ESS to the current remaining charge amount.
The method of claim 1,
After determining the second share of discharge,
Determining the final discharge sharing as the maximum power that can be supplied to the unit ESSs to be determined as the second discharge sharing,
As a result, if there is a unit ESS in which the final discharge share is determined to be the maximum power that can be supplied, determining the third discharge share according to the maximum discharge holding time for the remainder except for the unit ESS.
ESS output distribution method.
In the ESS output distribution device for determining the discharge sharing of each unit ESS in a structure in which a plurality of unit ESS is connected to the system,
An information obtaining unit obtaining power demand of the system and charging state information of the unit ESSs;
A storage unit in which charge state information and maximum supply power of the unit ESSs are recorded;
Based on the charging state information of each unit ESS, the maximum discharge holding time of each unit ESS is calculated, the discharge sharing for determining the discharge power of the respective unit ESS, based on the calculated maximum discharge holding time of each unit ESS Decision unit; And
A control unit for instructing output to the determined discharge powers for each unit ESS and scheduling a next output distribution
ESS output distribution device comprising a.
The method of claim 6,
The process of determining the respective discharge powers,
Determining a first discharge sharing in accordance with the maximum discharge holding time;
Determining a final discharge share as the maximum power that can be supplied for a discharge power according to the determined first discharge burden that exceeds the maximum power that can be supplied; And
Determining a second discharge share in accordance with the maximum discharge holding time for the remaining devices except for the device for which the discharge power is determined as the maximum supplyable power;
ESS output distribution device comprising a.

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