KR20200129554A - System and method for smoothing output of the renewable energy - Google Patents

Abstract

The present invention relates to an energy storage system and a method for controlling the same, and more particularly, to an energy storage system and a method for controlling the same, which enables a stabilized electric power to be supplied by smoothing the unstable output of renewable energy. According to the present invention, the energy storage system comprises: an energy management unit configured to control charging or discharging of a battery corresponding to a charging area or a discharging area when the output amount of a renewable energy source is included in the charging area or the discharging area; a battery unit for charging or discharging electric power in response to the output amount of the renewable energy source; and a power conversion unit for controlling charging or discharging of the battery unit.

Description

Energy storage system for smoothing renewable energy output and control method thereof {SYSTEM AND METHOD FOR SMOOTHING OUTPUT OF THE RENEWABLE ENERGY}

The present invention relates to an energy storage system and a control method thereof, and more particularly, to an energy storage system and a control method thereof for supplying stabilized electric power by smoothing the unstable output of renewable energy.

Renewable energy refers to the energy used by recycling existing fossil fuels or converting renewable energy, and is proposed as an alternative in response to the increasing demand for fossil fuels as the population increases and the development of industry. will be. Wind energy, solar energy, bio energy, algae energy, geothermal energy, etc. are present in the types of renewable energy. Unlike fossil fuels, these renewable energy are renewable, so there is no fear of depletion. However, it has advantages in that it is eco-friendly due to low carbon dioxide emissions, but it is highly influenced by the natural environment when installing structures (power plants) to produce new and renewable energy. There are also disadvantages such as points.

On the other hand, in addition to the interest in technology related to the production of renewable energy as an energy source, technological interest is constantly increasing in facilities that provide generated power. In particular, the demand for electricity is continuously increasing with the development of the industry. On the other hand, in the reality that resources for generating electricity are gradually reaching their limits, systems for efficiently managing the supply and demand of electricity are being studied in various ways. The Energy Storage System was proposed as part of an effort to solve the above problems.In particular, energy is used to reduce energy waste and consumer inconvenience due to an imbalance between the supply and demand of power within the system. In order to provide an environment that can be produced and consumed intentionally, research on energy storage systems has been actively conducted in recent years.

An energy storage system basically refers to a system that stores power generated from an energy source and then utilizes it when necessary.In particular, supply fluctuations, instability, and imbalance are inevitable at the time when energy source conversion to renewable energy is inevitable. Interest in energy storage systems is increasing in order to efficiently utilize new and renewable energies having characteristics.

In particular, among the disadvantages of renewable energy sources, instability may cause great damage to the entire system.In the present invention, to propose an energy storage system capable of smoothing the unstable supply of such renewable energy sources, and a control method thereof. do.

Unexamined Patent Publication No. 10-2018-0114272A (published on October 18, 2018)

An object of the present invention is to provide an energy storage system capable of smoothing a supply from a renewable energy source and a control method thereof.

In particular, the present invention provides batteries having different charge/discharge cycles in the energy storage system, so that even if supply from a renewable energy source is unstable, different batteries respond to the unstable range, thereby enabling smoothing. The purpose.

In addition, another object of the present invention is to increase the safety and stability of an energy storage system by mixing batteries of different charge/discharge cycles, and to maximize the life of the batteries.

Another object of the present invention is to provide a stable power supply according to the charging/discharging characteristics of each battery even in a power unstable supply situation in various cases by mixing batteries of different charging/discharging cycles.

In order to solve the above problems, the energy storage system according to the present invention sets a reference line REF for an output amount of a renewable energy source, and a charging area or a battery charge area for an output amount in a preset range around the reference line. Energy that defines at least one of the discharge regions of the battery, and controls charging or discharging of the battery corresponding to the charging region or the discharge region when the output amount of the renewable energy source is included in the charging region or the discharge region Lee Management Department; A battery unit charging or discharging electric power in response to an output amount of the renewable energy source; And a power conversion unit controlling charging or discharging of the battery unit. Includes.

In addition, in the energy storage system, the battery unit may include at least two or more batteries having different charge/discharge cycles. In this case, the battery may include a short cycle battery having a relatively short charge/discharge cycle and a long cycle battery having a relatively long charge/discharge cycle.

In addition, in the energy storage system, the energy management unit defines an output amount up to a preset range existing above the reference line as a charging area of a long-cycle battery, and an output amount of a higher range than the charging area of the long-cycle battery. For can be characterized in that it is defined as a charging area of a short-cycle battery. In this case, the energy management unit defines a discharge area of a long-period battery for an output amount up to a preset range existing below the reference line, and a short-period for an output amount lower than the discharge area of the long-period battery. It may be characterized as being defined as a discharge area of a battery.

In addition, in the energy storage system, the energy management unit resets a preset reference line to a new reference line based on the amount of output from the renewable energy source, and redefines the charging area or the discharge area of the battery based on the reset reference line. It can be characterized by that.

In addition, in the energy storage system, the short-cycle battery and the long-cycle battery may supply power to each other.

On the other hand, in the control method of an energy storage system according to another embodiment of the present invention, the energy management unit sets a reference line REF with respect to the output amount of the renewable energy source, and the output amount in a preset range is set around the reference line. Defining at least one of a charging area of a battery or a discharge area of a battery for the battery; An energy management unit monitoring an output amount of the renewable energy source; Controlling, by an energy management unit, to charge or discharge a battery corresponding to the charging area or the discharging area when the output amount of the renewable energy source is included in the charging area or the discharging area; Performing charging or discharging according to the control of the energy management unit by a battery unit and a power conversion unit; Includes.

In addition, in the control method of the energy storage system, the battery unit may include at least two or more batteries having different charge/discharge cycles. Further, the battery may include a short-cycle battery having a relatively short charge/discharge period and a long-cycle battery having a relatively long charge/discharge cycle.

In addition, in the controlling method of the energy storage system, the step of defining at least one of the charging area or the discharging area by the energy management unit may include: the energy management unit, up to a preset range existing above the reference line. The output amount may be defined as a charging area of a long-period battery, and an output amount higher than the charging area of the long-period battery may be defined as a charging area of a short-cycle battery.

In addition, in the method of controlling the energy storage system, the step of defining at least one of the charging area or the discharging area by the energy management unit may include: the energy management unit, up to a preset range existing below the reference line. The output amount may be defined as a discharge area of a long-period battery, and an output amount lower than the discharge area of the long-period battery may be defined as a discharge area of a short-cycle battery.

In addition, in the control method of the energy storage system, the energy management unit resets a preset reference line to a new reference line based on the amount of output from the renewable energy source, and a charging area or discharge of the battery around the reset reference line. It may be characterized in that it further comprises the step of redefining the region.

In addition, in the control method of the energy storage system, the short-cycle battery and the long-cycle battery may supply power to each other.

According to the present invention, there is an effect of stabilizing the supply from a renewable energy source.

In addition, according to the present invention, it is possible to increase the safety and stability of the entire energy storage system by mixing batteries having different charge/discharge cycles.

In addition, according to the present invention, since the functional burden of the batteries in the energy storage system can be reduced, the lifespan of these batteries can be maximized.

In addition, according to the present invention, it is possible to quickly respond to unstable power supply situations in various cases, thereby improving supply stability.

1 shows a schematic configuration of an energy storage system proposed by the present invention and configurations around the energy storage system.
FIG. 2 shows the amount of power per hour of power supplied to the energy storage system by a renewable energy source.
3 shows an area in which internal batteries of the energy storage system according to the present invention are operated in response to unstable power supply from a renewable energy source.
4 is a diagram illustrating an operation of the energy storage system according to the present invention in another example of supplying power to a renewable energy source.
5 is a sequence diagram illustrating a method of controlling an energy storage system according to the present invention.

Details of the object and the technical configuration of the present invention and the effects of the operation thereof will be more clearly understood by the following detailed description based on the accompanying drawings in the specification of the present invention. An embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

The embodiments disclosed herein should not be construed or used as limiting the scope of the present invention. It is natural to those skilled in the art that the description including the embodiments of the present specification has various applications. Accordingly, any of the embodiments described in the detailed description of the present invention are illustrative for better describing the present invention, and it is not intended that the scope of the present invention be limited to the embodiments.

The functional blocks shown in the drawings and described below are only examples of possible implementations. In other implementations, other functional blocks may be used without departing from the spirit and scope of the detailed description. Further, while one or more functional blocks of the present invention are represented as individual blocks, one or more of the functional blocks of the present invention may be a combination of various hardware and software configurations that perform the same function.

In addition, the expression to include certain elements is an expression of “open type” and simply refers to the existence of the corresponding elements, and should not be understood as excluding additional elements.

Furthermore, when a component is referred to as being “connected” or “connected” to another component, it should be understood that it may be directly connected or connected to the other component, but other components may exist in the middle. do.

FIG. 1 is a diagram for schematically illustrating an energy storage system 100 proposed in the present invention and configurations around the energy storage system 100.

Referring to FIG. 1, the energy storage system 100 according to the present invention is connected to a renewable energy source 200 and a grid 300 at the same time, and basically, the energy storage system 100 is a renewable energy source ( It serves to receive and store the power generated from 200) or to supply it back to the grid 300 side.

The term renewable energy source referred to in this detailed description may be understood to mean facilities capable of producing energy, that is, power using renewable energy more specifically, including wind power plants, geothermal power plants, May include solar power plants, bioenergy power plants, tidal power plants, etc. For reference, in this detailed description, a solar power plant is used as a representative example of a renewable energy source to aid understanding of the invention.

On the other hand, the grid 300 refers to a power grid that delivers electricity generated in a power plant to a consumer, and this may include components necessary for supplying power to individual loads, such as a transmission line and a substation.

The energy storage system 100 may include an energy management unit 110, a battery unit 120, and a power conversion unit 130 as a basic configuration as shown in FIG. 1, and additionally, the battery management unit 140 May be further included.

First, the energy management unit 110 (Energy Management System) analyzes the energy use pattern within the system and allows the supply of energy to be adjusted based on the analyzed use pattern.It collects and loads information on the entire power supply system at all times. It means a configuration that optimally controls the operation of power generation facilities connected to the system through frequency monitoring, and performs economic power supply through efficient management of the power system. The energy management unit 110 collects information such as power consumption demand and current power situation of users in the system, and analyzes the power consumption pattern from the past to the latest, as one main function, and also uses the analyzed power consumption pattern. Another function is to predict future power consumption based on the future, and adjust the charge/discharge schedule in the energy storage system 100 accordingly.

In addition, the energy management unit 110 in the present invention can monitor the amount of power supplied from the renewable energy source 200 at all times, and accordingly, as in the embodiment in the drawings to be described later, the battery unit 120 and the power Charging and discharging of the batteries may be controlled by controlling the conversion unit 130.

Next, the power conversion unit 130 (Power Conditioning System) is an intermediate-stage system that basically connects the power produced from an energy source with the power system, and performs conversion between AC and DC, voltage/current/frequency conversion, etc. Perform. For example, energy supplied from the renewable energy source 200 may be charged in the battery unit 120 through a power conversion system, or the energy discharged from the battery unit 120 may be charged through the power conversion unit 130. Can be supplied to the system. In addition, the power conversion unit 130 in the present invention may be driven under the control of the energy management unit 110, and in particular, the terminal provided in the battery unit 120 with reference to the data received from the energy management unit 110 Charging and discharging of periodic batteries and long periodic batteries can be controlled. In this case, data that can be referred to by the power converter 130 may include a real-time amount of power of the power supplied from the renewable energy source 200, a real-time variation value of the supplied power frequency, and the like.

Next, the battery unit 120 basically includes batteries capable of charging or discharging in order to smooth the unstable power supplied from the aforementioned renewable energy source 200. At this time, the battery unit 120 The provided batteries may be two or more batteries having different charge/discharge cycles. Preferably, the two or more batteries may include a short-period battery and a long-period battery, that is, a charge/discharge period different from each other, one of which is relatively short, and the other of which is relatively long. In addition, the batteries mentioned in this detailed description may include various things such as a flow battery and a secondary battery, and for example, a flywheel, a NAS, an all-solid-state battery, and the like may be included. For reference, in this detailed description, a lithium ion battery will be referred to as a representative example of a short-cycle battery and a vanadium redox flow battery as a representative example of a long-cycle battery, but short-cycle batteries and long-cycle batteries are It is not limited to the embodiment, and the type is not limited as long as it can be defined by a relative difference in charge/discharge cycles.

Finally, the energy storage system 100 according to the present invention may further include a battery management unit 140 (Battery Management System). The battery management unit 140 senses the voltage, current, temperature, etc. of the battery and controls the charge/discharge amount of the battery to an appropriate level. It also performs cell balancing of the battery and monitors the remaining capacity of the battery. In addition, the battery management unit protects the battery by performing an emergency operation when a dangerous situation occurs. The battery management unit performs a separate function from the power conversion unit 130 described above, but has a common point in that each has control rights for the battery, and the power conversion unit 130 and the battery management unit 140 are according to design. Can also be implemented as a single server.

The main components of the energy storage system 100 according to the present invention have been described above.

Hereinafter, a method of smoothing the unstable power supplied from the renewable energy source 200 by the energy storage system 100 according to the present invention will be described with reference to FIGS. 2 and 3.

First, FIG. 2 shows a real-time output amount of power supplied from a renewable energy source 200, more specifically, to the energy storage system 100 seen from a solar power plant. The graph of FIG. 2 shows the amount of output from 9:00 am to 11:00 am, and it can be seen that the power from the solar power plant is supplied very unstable. This is due to the fact that the solar panel does not properly receive light from the sun due to clouds, etc., and the technology so far is insufficient to maintain the unstable supply of the solar power plant at the source.

On the other hand, FIG. 3 is a simplified illustration of a method of solving the shortcomings of a solar power plant that produces such an unstable output. In particular, the present invention is characterized in that two types of batteries are interlocked with the output of the solar power plant to be driven. To do.

Referring to FIG. 3, the amount of real-time power supplied to the energy storage system 100, that is, the amount of energy output from a solar power plant, can be divided into a total of four areas as shown in FIG. 3, specifically a The area is defined as the area where the charge is made by the short-cycle battery, the area b is the area where the long-cycle battery is charged, the area c is the area where the long-cycle battery is discharged, and the d area is the area where the short-cycle battery is discharged. Can be. That is, these areas are defined by dividing the output from the photovoltaic power plant based on the center line (REF) and defining the upper side as a charge by the battery unit 120 and the lower side as a discharge area. Among the regions, output fluctuations within a preset range are controlled by charging and discharging the long-period battery, and output fluctuations exceeding the preset range by controlling the charging and discharging of short-cycle batteries to smooth the solar power plant output. will be.

For example, area a can be understood as a state in which the solar panel can supply more than the amount of power required by the system in an environment in which sufficient sunlight can be received. In this case, the energy storage system 100 is The amount of power can be controlled to charge a short-cycle battery, that is, a high-output, low-capacity single-cycle battery. Conversely, the d area can be understood as being in an environment where the solar panel cannot receive sufficient sunlight. In this case, the energy storage system 100 compensates for the insufficient amount of power from the solar power plant by discharging the short-cycle battery. You can do it. On the other hand, the area b is in an environment in which the solar panel can receive less sunlight than the area a, and the energy storage system 100 can be controlled to charge a low-power, high-capacity long-period battery, and c In the region, on the contrary, the long-period battery can be controlled to discharge.

On the other hand, the energy storage system 100 according to the present invention can control charging and discharging of only one of a short-cycle battery or a long-cycle battery for the predetermined output section as described above, as well as charging and discharging both types of batteries. You can also control it to happen.

In other words, when looking at the solar power plant output between about 9:10 minutes and about 9:20 minutes, in the above-described embodiment, only the long-cycle battery is charged in the area b, and in the area a, only a short period is performed. It has been described that the energy storage system 100 is controlled so that only the battery is charged, but in the modified embodiment, the long-cycle battery is charged according to the output fluctuation of the solar power plant from about 9:10 minutes to about 9:20 minutes. However, it may be controlled to simultaneously charge a long-cycle battery and a short-cycle battery for an output exceeding a certain reference point. That is, in the modified embodiment, when the output from the photovoltaic power plant is high around the reference line and excess power is generated, the long-period battery is charged according to the corresponding surplus power, and at the same time, when surplus power exceeding a certain value occurs, By charging the short-period battery each time, ultimately, the two types of batteries are simultaneously charged or only the long-period battery is charged can exist within a corresponding period.

On the other hand, in another modified embodiment, the energy storage system 100 according to the present invention continuously maintains the charge/discharge state regardless of the output fluctuation of the solar power plant for the charge/discharge region of the long-period battery. For a range exceeding the value of, it may be controlled so that charging and discharging of the short-period battery can be further performed while the charging/discharging state of the long-period battery is maintained. Again, taking a section between about 9:10 minutes and 9:20 minutes as an example, there is a fluctuation in the output of the solar power plant in the area b in the corresponding section, but the energy storage system 100 continuously operates the long-cycle battery regardless of this. By leaving the battery in a rechargeable state, that is, once the control is made to the state of charge of the long-cycle battery, by leaving it without any further control, it is possible to continuously charge the corresponding long-cycle battery. The short-cycle battery can be charged only for a range.

For reference, in the above-described embodiments, only the charging control process in a specific section has been described to aid understanding of the invention, but it will be understood that charging or discharging may be performed in the same manner in other sections.

On the other hand, FIG. 4 is a diagram for explaining another embodiment of the present invention. In FIG. 3, the reference line is continuously maintained at a constant value. In FIG. 4, the reference line changes with time. It is for explaining the embodiment.

As described above, since power supply from the renewable energy source 200 is highly unstable, it is difficult to predict how the supply amount will change over time. In the case of the output of the photovoltaic power plant shown in FIG. 2 or 3, in order to aid understanding of the invention, it is assumed that the surplus power and underpower for a certain period of time will be approximately the same amount, that is, the surplus power and underpower by the reference line. Although it is assumed that this amount will be similar, it is necessary to consider such an environment in order to actually proceed with smoothing because the output from the actual solar power plant does not necessarily conform to the above premise.

4 is a premise of the above situation, the energy storage system 100 according to the present invention, more precisely, the energy management unit 110 resets the reference line according to the passage of time, and according to the reset reference line The charging/discharging area and the charging/discharging area of the short-period battery are also redefined.

In FIG. 4, for example, it is assumed that the output from the solar power plant is cumulatively increasing, and in this case, it can be seen that the baseline gradually increases compared to the initial time point. Such a baseline reset may be performed based on the accumulated output amount of the solar power plant up to the point in time by the energy management unit 110 with reference to the capacity of the battery unit 120 at a certain period, or based on the amount of output increase in the solar power plant. Also, it may be performed based on environmental information such as weather collected from the outside. In the case of resetting the baseline in this way, the capacity of the battery unit 120, that is, the capacity of the long-cycle battery and the capacity of the short-cycle battery can be considered as the energy storage system 100, so that battery operation is possible according to the specifications of each battery. Has the effect of being.

When looking back to FIG. 4, the reference line shown in FIG. 4 is illustrated as being continuously increased without interruption of the slope, but the reference line may not necessarily be continuous, and may have a shape of a discontinuous line over time. will be. Meanwhile, whenever the reference line is reset, charging/discharging areas of the short-cycle battery and the long-cycle battery may also be redefined. Areas e, f, g, and h of FIG. 4 represent a charging area of a short-cycle battery, a charging area of a long-cycle battery, a discharge area of a long-cycle battery, and a discharge area of a short-cycle battery, respectively.

As described above, the energy storage system 100 according to the present invention, more precisely, the energy management unit 110 may set a baseline and define battery charging/discharging areas based on unstable power supplied from the renewable energy source 200.

For reference, the short-cycle battery and the long-cycle battery included in the battery unit 120 may be implemented to supply power to each other. In other words, short-cycle batteries and long-cycle batteries have different charging and discharging times and different charging and discharging amounts, so that the amount of electric energy stored in either side can be greatly reduced. By implementing mutual exchange of electric energy, the amount of electric energy stored between the two types of batteries You can try to balance it.

On the other hand, in the previous description, only an embodiment in which batteries are charged and discharged according to the output from the renewable energy source 200 that fluctuates in real time has been described, but the present energy storage system 100 includes the renewable energy source ( Even based on data predicting the output amount of 200) in advance, charging and discharging of the short-cycle battery and the long-cycle battery can be controlled. This can be expected to have a great effect in controlling the long-period battery. In the case of charging and discharging a long-period battery that requires a relatively long period of time for charging and discharging in light of past output data, the output of the renewable energy source 200 is smoothed. Can be more effective. Furthermore, even for a short-period battery, the efficiency of smoothing can be improved by controlling the charging and discharging in light of the output amount of the renewable energy source 200 in the past.

Meanwhile, FIG. 5 schematically shows a method of controlling the energy storage system 100 according to the present invention in order.

According to FIG. 5, the control method may first start from the step S101 of monitoring the output amount of the renewable energy source 200. In order to smooth the output of the renewable energy source 200, it is first necessary to determine how much the output amount of the renewable energy source 200 that is currently being output is fluctuating. The energy management unit 110 in the present energy control system Can perform such a monitoring step.

Next, the energy management unit 110 may define a reference line and charge/discharge areas of each battery based on the output amount of the renewable energy source 200 (S102). Since the reference line and the charge/discharge areas have already been described above, detailed descriptions will be omitted here.

After step S102, the energy management unit 110 may control the battery unit 120 according to the output amount of the renewable energy source 200 that is currently being monitored. (S103) At this time, the meaning of controlling the battery unit 120 means controlling the charging and discharging of the short-period battery and the long-period battery for each charge/discharge region as in the embodiment of FIGS. 3 and 4 above. it means.

On the other hand, after step S103, the energy management unit 110 according to the present invention returns to step S101 again to monitor the output amount of the renewable energy source 200, and then redefine the baseline and charge/discharge areas, etc. By repeating, the output of the renewable energy source 200 can be smoothed.

Above, an energy storage system for smoothing a renewable energy source and a control method thereof were examined. The present invention is not limited to the specific embodiments and application examples described above, and various modifications can be implemented by those of ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, these modified implementations should not be understood as being distinguished from the technical idea or perspective of the present invention.

100 energy storage systems
110 Energy Management Department
120 battery part
130 power converter
140 Battery Management Department
200 renewable energy sources
300 grid

Claims (14)

In the energy storage system,
A reference line REF is set for an output amount of a renewable energy source, and at least one of a charging area or a discharge area of a battery is defined for an output amount of a preset range around the reference line, and the renewable energy source An energy management unit configured to control charging or discharging of a battery corresponding to the charging area or discharging area when the output amount of is included in the charging area or the discharging area;
A battery unit charging or discharging electric power in response to an output amount of the renewable energy source; And
A power conversion unit controlling charging or discharging of the battery unit;
Characterized in that it comprises a,
Energy storage system.
The method of claim 1,
The battery unit is characterized in that it comprises at least two or more batteries having different charge/discharge cycles,
Energy storage system.
The method of claim 2,
The battery, characterized in that it includes a short-cycle battery having a relatively short charge/discharge cycle and a long cycle battery having a relatively long charge/discharge cycle,
Energy storage system.
The method of claim 3,
The energy management unit,
It is defined as a charging area of a long-cycle battery for an output amount up to a preset range existing above the reference line, and a charging area for a short-cycle battery for an output amount higher than the charging area of the long-period battery. Characterized by,
Energy storage system.
The method of claim 4,
The energy management unit,
A discharge area of a long-cycle battery is defined for an output amount up to a preset range present below the reference line, and a discharge area of a short-cycle battery is defined for an output amount lower than the discharge area of the long-cycle battery. Characterized by,
Energy storage system.
The method of claim 1,
The energy management unit,
Based on the amount of output from the renewable energy source, reset a preset reference line to a new reference line,
Characterized in that redefining the charging area or the discharging area of the battery based on the reset reference line,
Energy storage system.
The method of claim 3,
The short-cycle battery and the long-cycle battery are characterized in that power can be supplied to each other,
Energy storage system.
In the control method of the energy storage system,
Setting, by an energy management unit, a reference line REF with respect to an output amount of a renewable energy source, and defining at least one of a charging area of a battery or a discharge area of a battery for an output amount of a preset range around the reference line;
An energy management unit monitoring an output amount of the renewable energy source;
Controlling, by an energy management unit, to charge or discharge a battery corresponding to the charging area or the discharging area when the output amount of the renewable energy source is included in the charging area or the discharging area;
Performing charging or discharging by the battery unit and the power conversion unit under control of the energy management unit;
Containing,
Control method of energy storage system.
The method of claim 8,
The battery unit is characterized in that it comprises at least two or more batteries having different charge/discharge cycles,
Control method of energy storage system.
The method of claim 9,
The battery, characterized in that it includes a short-cycle battery having a relatively short charge/discharge cycle and a long cycle battery having a relatively long charge/discharge cycle,
Control method of energy storage system.
The method of claim 10,
The step of defining at least one of the charging area and the discharging area by the energy management unit,
The energy management unit defines a charging area of a long-cycle battery for an output amount up to a preset range existing above the reference line, and charging a short-cycle battery for an output amount higher than the charging area of the long-cycle battery. Characterized in that it comprises the step of defining as a region,
Control method of energy storage system.
The method of claim 11,
The step of defining at least one of the charging area and the discharging area by the energy management unit,
The energy management unit defines a discharge area of a long-period battery for an output amount up to a preset range existing below the reference line, and a discharge of a short-period battery for an output amount lower than the discharge area of the long-period battery. Characterized in that it comprises the step of defining as a region,
Control method of energy storage system.
The method of claim 8,
The energy management unit,
Resetting a preset reference line to a new reference line based on the amount of output from the renewable energy source, and redefining a charging area or a discharging area of the battery based on the reset reference line, further comprising,
Control method of energy storage system.
The method of claim 10,
The short-cycle battery and the long-cycle battery are characterized in that it is possible to supply power to each other,
Control method of energy storage system.

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