KR102332937B1 - System for controlling energy storage system by regional group and method for managing energy using the same - Google Patents

Abstract

The present invention discloses a control system for an energy storage device. More particularly, the present invention relates to a control system for a region-based energy storage device that controls the amount of charging and discharging in real time in response to a peak hourly, and an energy management method using the same.
According to an embodiment of the present invention, when the actual measured load value among the customers in the same premises in each region deviates from the threshold of the load prediction value, the deviation value is calculated through comparison for each customer, and the discharge amount is adjusted based on this. There is an effect of improving the efficiency between energy storage devices.

Description

A control system for an area-based energy storage device and an energy management method using the same

The present invention relates to a control system for an energy storage device, and more particularly, to a control system for a region-based energy storage device that controls the amount of charging and discharging in real time in response to a peak hourly, and an energy management method using the same.

Recently, interest in an energy storage system (ESS) has increased in relation to the field of new and renewable energy. Energy storage device refers to a system that efficiently uses energy by storing electricity remaining in the power system to meet the power demand of consumers, which is continuously increasing every year according to the current industrial development, and then using it when necessary.

In general, the energy storage device stores idle power when a light load occurs, such as at night, and uses the stored idle power when a heavy load occurs, thereby contributing to optimization of power quality through load leveling and frequency control. can

Such an energy storage device is expected to play a key role in connecting to the power grid after converting a renewable energy source that is currently being actively developed into high-quality power.

Accordingly, various methods for efficiently using power through the energy storage device have been proposed. As an example, there is a method of determining an operation mode of an energy storage device based on a power relation between a system, a battery, and a load according to a battery charging or discharging control signal and operating the energy storage device accordingly. According to this method, a charging/discharging time point of the battery is set based on a peak cut, and the battery is charged or discharged according to a control signal.

However, the peak cut that determines the charging/discharging timing of the battery is determined according to the peak power calculated based on the load prediction value calculated based on the data of the previous year, and the basic charge is determined.

In addition, as the energy storage device is discharged with a fixed discharge amount according to the designed peak cut value regardless of the real-time load situation, it cannot properly lower the power peak for the load use, while lowering the utilization rate of the energy storage device. There is a limit that cannot be maximized.

Laid-Open Patent Publication No. 10-2016-0082641 (published on July 8, 2016)

The present invention has been devised to achieve the above object, and the present invention measures a real-time load rather than a load predicted value, and variably applies the discharge amount and charging time of the energy storage device based on the measured value derived therefrom. There is a problem to provide a control system of a device and an energy management method using the same.

In addition, the present invention has a problem in maximizing the efficiency by flexibly controlling the discharge amount of the battery according to the power use characteristics of the ward in each region with respect to peak power having regional variations.

In order to solve the above problems, a control system for an energy storage device according to a preferred embodiment of the present invention is a control system for an energy storage device installed in two or more consumers included in the same premises, and a load value for every hour is calculated in real time. A measuring unit that actually measures, a prediction unit that generates a load prediction value based on past data, generates a load profile according to the load prediction value, sets a peak cut using the load profile, and energy according to the current load value compared to the peak cut A power calculator for calculating the amount of charge or discharge for each hour of the storage device, a control signal generator for generating a control signal for charging or discharging the energy storage device according to the calculated amount of charge or discharge, one or more other consumers in the same premises A communication unit connected to and receiving the discharge amount of the other consumer, a comparison unit generating a deviation value by comparing the discharge amount between the consumer and another consumer, and a discharge amount adjusting unit adjusting the amount of charge or discharge calculated according to the deviation value may include.

The other consumers are connected to the consumer through a common connection point to the upper or lower layer, and the discharge amount adjusting unit may perform discharge driving in response to the deviation value when the discharge amount of other consumers in the lower layer compared to the consumer is large. .

The power calculator is configured to increase the peak cut when the current load value relative to the load predicted value is higher than a preset threshold, and downwardly adjust the peak cut when the current load value to the load predicted value is lower than the preset threshold, and At the request of the discharge amount adjusting unit, the calculated amount of charge or discharge may be increased or decreased according to the deviation value.

The discharge amount adjusting unit may upwardly adjust the discharge amount according to the number of consumers in the same premises, in which the energy storage device is not installed.

As a result of analyzing the load pattern by the power calculation unit, the control signal generator is a control signal for charging and driving the energy storage device during a period between a plurality of power peaks when the M-type peak concentration type pattern in which a plurality of power peaks exist , and the discharge amount adjusting unit may adjust the charge amount or the discharge amount at any one time point among the plurality of power peaks in response to the deviation value.

In addition, as an energy management method using a control system of an energy storage device according to an embodiment of another aspect of the present invention for solving the above-described problems, generating a load prediction value based on past data, a load according to the load prediction value Creating a profile, setting a peak cut using the load profile, measuring the load value in real time, and comparing the current load value with the peak cut when the load predicted value and the current load value are within a preset threshold discharging and driving the energy storage device when the current load value exceeds the peak value, otherwise charging and driving the energy storage device, connected to one or more other consumers in the same premises to receive the discharge amount of the other consumers and generating a deviation value by comparing the discharge amount between the customer and other consumers, and adjusting the calculated amount of charge or discharge according to the deviation value.

The step of adjusting the calculated amount of charge or the amount of discharge according to the deviation value further includes the step of upwardly adjusting the discharge amount in response to the deviation value if the discharge amount of another consumer in a lower layer is greater than that of the consumer can do.

When the discharge amount of other consumers in the lower tier is greater than the discharge amount of the consumer, the step of adjusting the discharge amount upward in response to the deviation value corresponds to the number of consumers who are not equipped with an energy storage device among the consumers in the same premises to increase the discharge amount.

According to an embodiment of the present invention, the power grid measures the load value in real time, calculates and discharges the discharge amount of the battery of the energy storage device based on the measured load value, and controls to drive the discharge, and stores energy by varying the charging and discharging times. It has the effect of maximizing the utilization rate of the device and reducing the electricity usage fee.

In addition, according to the embodiment of the present invention, when any one of the customers in the same premises in each region sharply increases the actual measured load value by more than a certain level, the deviation value is calculated through comparison for each customer, and based on this, the discharge amount of other customers is calculated. It has the effect of improving the efficiency between a plurality of energy storage devices in the region by adjusting

1 is a diagram schematically showing the overall structure of a power grid to which a control system according to an embodiment of the present invention is applied.
2 is a diagram schematically showing the structure of one consumer to which a control system according to an embodiment of the present invention is applied.
3 is a diagram schematically illustrating a connection structure of a control system of an energy storage device according to an embodiment of the present invention.
4 is a diagram specifically illustrating the structure of a control system for an energy storage device according to an embodiment of the present invention.
5 is a diagram illustrating a structure of an energy storage device according to an embodiment of the present invention.
6 is a diagram illustrating an energy management method using a control system of an energy storage device according to an embodiment of the present invention.
7 is a diagram illustrating an example of a graph of a time load value of a power grid to which a control system of an energy storage device according to an embodiment of the present invention is applied.
8 is a diagram illustrating another example of a graph of a load value for each time of a power grid to which a control system of an energy storage device according to an embodiment of the present invention is applied.
9 is a diagram illustrating an example of a graph of a load value for each time of a power grid to which a control system of an energy storage device according to another embodiment of the present invention is applied.

Prior to the description, when a part in the entire specification "includes" or "includes" a certain component, it does not exclude other components, but may further include other components unless otherwise stated. means there is In addition, terms such as "...unit", "...device", "...system", etc. described in the specification mean a unit that processes at least one function or operation, , which may be implemented in hardware, software, or a combination of hardware and software.

In addition, the term "embodiment" herein means serving as an illustration, example, or illustration, but the subject matter of the invention is not limited by such examples. Also, "comprising", "comprising", "having" and other similar terms are used, but when used in the claims, " as an open-ended transition word that does not exclude any additional or other elements. It is used generically in a manner analogous to the term "comprising".

The various techniques described herein may be implemented in conjunction with hardware or software, or a combination of both, where appropriate. As used herein, terms such as "...part", "...device" and "...system" likewise refer to computer-related entities, i.e. hardware, a combination of hardware and software, software or It can be treated as equivalent to software at the time of execution. In addition, in the present invention, each function executed in the server or terminal may be configured in module units, and may be recorded in one physical memory, or may be recorded in a distributed manner between two or more memories and recording media.

Hereinafter, a control system for an energy storage device and an energy management method using the same according to an embodiment of the present invention will be described with reference to the drawings.

1 is a diagram schematically showing the overall structure of a power grid to which a control system according to an embodiment of the present invention is applied, and FIG. 2 is a diagram schematically showing a structure for one customer to which a control system according to an embodiment of the present invention is applied. It is a drawing.

1 and 2, according to an embodiment of the present invention, there are a plurality of local power grids connected to the national power grid centered on the power plant (system), and each local power grid is the same or different from each other. Disclosed is a control system for an energy storage device installed in each nth order consumer in a power grid system having as main components consumers connected to the nth order (n is a natural number) power grid layer.

That is, the control system 100 of the present invention may be applied to a local power grid including the grid 10 , the energy storage device 20 , and the load 30 . Here, the consumer belonging to the local power grid is a node of the local power grid, and multiple loads may be layered and connected through a common connection point. As an example, consumers in the same premises may be connected to one transformer in the same premises, and n-1 consumers may be connected to an upper layer, and n-order consumers may be connected to a lower layer of n-1 consumers.

And, each consumer may include an energy storage system (ESS, 20), but not all consumers include it.

In addition, the grid 10 may be a power plant operated by Korea Electric Power Corporation, and the power grid considered in the embodiment of the present invention provides energy from the grid 10 to the load 30 according to the flow of energy in a general situation in a timely manner. It is supplied (s1), and the energy storage device 20 may charge (S2) energy from the system 10 or discharge energy to the load 30 (S3) according to a peak cut set based on the load predicted value.

The energy storage device 20 may store energy supplied from the system 10 or discharge the charged energy to the load 30 according to a policy. In particular, during discharge driving, the energy storage device 20 may minimize the occurrence of excess amount by performing discharge driving according to the optimal discharge amount calculated by the control system.

The control system 100 generates a load prediction value using past data for the load 30 and may set a peak cut based on this, and controls the charge and discharge driving of the energy storage device 20 in response to the peak cut. However, in particular, it is possible to adjust the discharge amount in response to the current load value actually measured in the section after the peak cut is exceeded by being connected to the power grid and measuring the current load value for each consumer in real time.

That is, according to the embodiment of the present invention, the control system 100 of the energy storage device induces charge reduction with a limited capacity by varying the discharge amount when the energy storage device 20 is discharged in each consumer. do.

In particular, the energy control system 100 according to the embodiment of the present invention stores energy of the consumers in the same premises when it is estimated that some of the consumers connected to the same local power grid deviates from the load predicted value and the power consumption is significant. By flexibly adjusting the operation of the device, the electricity supply and demand in each region will be stabilized.

Hereinafter, a control system for each consumer's energy storage device according to an embodiment of the present invention will be described with reference to the drawings.

3 is a diagram schematically illustrating a connection structure of a control system of an energy storage device according to an embodiment of the present invention.

3, the control system 100 of the energy storage device according to the embodiment of the present invention may be installed in some or all of a plurality of n-th consumers (node n) in the same premises connected to the local power grid, Each installed control system 100 may be connected to each other through a separate communication network.

All the customers in the same premises (node 1 to node n) can be connected to one transformer in the premises through a premises power line through a common connection point, and even if the customers in the same premises (node 1 to node n) are any one customer, for example 2 As no energy storage device is installed in the car consumer (node 2), the control system 100 may not exist.

In addition, each of the consumers (node 1 ~ node n) may be connected to the same or a layer. As an example, the primary acceptor (node 1) may be connected to the upper layer, the secondary acceptor (node 2) may be connected to the lower layer, the secondary acceptor (node 2) is the upper layer, and the nth acceptor (node n) is the lower layer. can be connected to each other. Such a hierarchical structure may be applied in order to stably build an electric power grid and operate electric power for the premises according to conditions such as the distance between customers in the region, the number of loads, and the like.

3 illustrates a configuration in which a primary customer (node 1) and an n-th customer (node n), except for the secondary customer (node 2), are connected to the upper and lower layers through the premises power line, respectively.

In this structure, the current load value of the lower layer n-th consumer (node n) increases significantly, so that the control system 100 is discharged and continues for a certain period of time in a chain to other consumers (node 1, node 2) As a result, if the current load value rises, there may be a disruption in the power supply in the region, and in extreme cases, a blackout may occur.

In order to minimize this problem, in the embodiment of the present invention, when the current load value of a specific n-th consumer (node n) increases exceptionally significantly, the current load value of the primary consumer (node 1) of the associated upper layer and It is characterized in that the deviation value is calculated by comparison, and the charge amount or discharge amount of the energy storage device of the primary consumer (node 1) is adjusted.

That is, among the consumers (node 1 ~ node n) connected through the same power line, the control system 100 of the consumers (node 1, node n) in which the energy storage device is installed is connected to each other, and any one of them is more than usual When the measured load value rises sharply, not only the raised n-th consumer drives the discharge, but also the primary consumer connected to it switches from the charge-driven state to the discharge-drive state or increases the amount of discharge during the discharge operation, thereby increasing the amount of discharge in the local network. This prevents the increase in the amount of power supplied to the system from exceeding a certain level.

In addition, if there is one or more secondary consumers (node 2) included in the same premises but not installed with the control system 100, the amount of discharge may be adjusted upward in accordance with the number of the consumers. This configuration is to adaptively respond to a sudden increase in power consumption that may occur when there are a large number of consumers whose current load value cannot be predicted because the energy control system 100 does not exist in the consumers in the same premises. .

4 is a diagram specifically illustrating the structure of a control system for an energy storage device according to an embodiment of the present invention.

Referring to FIGS. 3 and 4 , the control system 100 for an energy storage device of the present invention is a control system for an energy storage device installed in two or more consumers included in the same premises, and it measures the load value for each hour in real time. measuring unit 110, a prediction unit 120 that generates a load prediction value based on past data, generates a load profile according to the load prediction value, sets a peak cut using the load profile, and sets the peak cut compared to the current load value A power calculation unit 140 for calculating the amount of charge or discharge for each hour of the energy storage device according to the 160), a communication unit 210 that is connected to one or more other consumers in the same premises and receives the discharge amount of the other consumers, a comparison unit 220 that compares the discharge amount between the customer and other consumers to generate a deviation value, the deviation value It may include a discharge amount adjusting unit 230 that adjusts the calculated amount of charge or discharge according to .

The measurement unit 110 may measure the load value of the current load generated in the power grid in real time. Here, the measured load value may be different from the load predicted value. In fact, when looking at the actual amount of power demanded by one consumer over time, there may be a tendency to demand more or less power than the predicted value in an unspecified pattern.

The prediction unit 120 may generate a load prediction value by predicting a load generated according to a load value trend based on past data. This load estimate may be used to generate a load profile.

Here, the load prediction value may be used to derive a function representing the hourly wattage value. For this purpose, the past data may be data recording past use of the load, and an average value of the power usage over time for the last 1 day, 3 days, or 10 days may be utilized. Electricity consumption is greatly affected by seasons and weather, and thus the demand varies. For example, if the summer heat continues, there is a situation in which electricity consumption is affected by a sharp increase in power consumption due to cooling. Therefore, in order to derive a more general result, it is possible to utilize past data having a similar temperature from a specific time point to a target time point.

The power calculator 140 may generate a load profile by using the load predicted value by the predictor 120 , and may set a peak cut serving as a driving standard of the energy storage device 20 in response thereto.

In particular, the power calculation unit 140 may calculate the amount of discharge for each hour of the energy storage device according to the current load value for each hour measured by the measurement unit 110 , and convert the calculated amount of discharge to the control signal generator 160 . ) to set a variable discharge amount according to the current load value, thereby inducing charge reduction.

In addition, the power calculator 140 increases the peak cut when the current load value compared to the load predicted value is higher than the preset threshold, and when the current load value compared to the predicted load value is lower than the preset threshold, the peak cut is lower. can be adjusted downward.

This function can minimize the problem that the peak cut for cost reduction is not normally performed because the difference between the predicted value and the actual value is unexpectedly significant.

The control signal generating unit 160 may generate a control signal for controlling the driving of the energy storage device 20 in response to the amount of discharge provided from the power calculating unit 140 .

Meanwhile, the control system 100 of the energy storage device of the present invention may further include a DB 180 that stores past data referenced by the above-described prediction unit 120 to generate a load prediction value.

The communication unit 210 may be connected to one or more other consumers in the same premises through a communication line to transmit/receive the charge amount or discharge amount of the energy control device 20 calculated by the control system 100 of the other consumers to each other.

The comparison unit 220 compares the charge or discharge amount of the energy storage device 20 currently set by the control systems 100 of each consumer and the charge or discharge amount of the energy storage device of another consumer, and the difference A deviation value can be generated according to

The adjusting unit 230 may adjust the calculated amount of charge or discharge according to the deviation value. In other words, there is no specificity in each consumer's own load value, but if a sudden change occurs in the load value of other consumers in the same premises, the charge or discharge amount of his or her energy storage device is determined according to the deviation value so that it can be shared among the consumers. will adjust

This configuration is to prevent a supply shortage due to a short-term surge in power consumption in the area due to a sudden and remarkably high current load value of only some consumers, rather than a change in the current load value of all consumers in the same premises. , the current load value of the consumer has not increased, but in order to stabilize the power supply in the region as a whole, the charging driving is switched to the discharging driving or the discharging amount is increased.

In particular, a sudden change in the load value of only a specific customer in the same premises can be viewed as a special situation that is difficult to predict, not a factor commonly applied in the region such as weather and temperature, and the energy storage device 20 installed in the premises By operating flexibly, it has the effect of maintaining a stable power supply to a specific area.

Separate electricity costs may apply to consumers participating in these operations.

Hereinafter, a structure of an energy storage device to which a control system according to an embodiment of the present invention is applied will be described with reference to the drawings.

5 is a diagram illustrating a structure of an energy storage device according to an embodiment of the present invention.

Referring to FIG. 5 , the energy storage device 20 to which the control system of the present invention is applied includes a battery 27 which is a plurality of energy storage means capable of charging or discharging, and stores energy in the battery 27 or , the stored energy may be discharged to the load 400 .

In addition, in order to implement the above-described function, the energy storage device 20 includes an EMS (Energy Management System) 21 for monitoring and controlling each component, and a Power Conditioning System (PCS) 22 for power supply and management; A Battery Management System (BMS) 23 for managing charging or discharging of the battery 27 may be included.

The energy storage device 20 may be implemented to enable efficient battery management as a battery charge and discharge plan is adaptively established according to the type and characteristics of the battery 27 . In particular, the energy storage device 20 serves as an energy storage for storing power supplied through a renewable energy generation facility or system through charging and driving, and as an energy source for supplying stored energy to a power load through discharging. can do.

In detail, the EMS 21 is an energy management device, and may monitor the state of the battery 27 and monitor and control the state of the PCS 22 .

The PCS 22 is a power conversion device, and may serve to complement each other due to the fact that the characteristics at the time of charging and discharging the power are different. Specifically, the PCS 22 serves to convert between AC and DC and to convert voltage, current, and frequency. Energy supplied from the power plant through the system can be supplied to a power load or charged to the battery 27 . . Alternatively, power management may be performed by discharging the battery 27 and supplying the stored energy to the power load. In this case, the charging and discharging of the battery 27 is operated in consideration of the type and characteristic information of the battery, and the timing may be determined based on a control signal transmitted from the control system. In addition, the PCS 22 may monitor the power consumed by the load and store it as information.

The BMS 23 is a battery management device, and by sensing the voltage, current, temperature, etc. of the battery 27, can control the amount of charge and discharge of the battery to an appropriate level, perform cell balancing, and capacity can be found.

In addition, the BMS 23 can protect the battery 27 through an emergency operation when a danger is detected, can store the type and characteristic information of the battery 27 , and charge and Discharge operation can be managed.

In addition, the battery 27 may store electrical energy in the energy storage device 20 . In particular, power converted into a predetermined form through the PCS 22 may be charged and stored in the battery 27 , and may be driven by discharging when necessary. The battery 27 may be implemented with a plurality of cells, and the plurality of cells may be charged and discharged simultaneously or independently of each other.

In the above structure, the EMS 21 can control the charging and discharging driving of the battery 27 by the control signal of the associated control system, and determining the charging and discharging time in response to the control signal, the amount of charge or the amount of charge. The quantity can be adjusted.

Hereinafter, an energy management method using a control system of an energy storage device according to an embodiment of the present invention will be described with reference to the drawings.

6 is a diagram illustrating an energy management method using a control system of an energy storage device according to an embodiment of the present invention. In the following description, even if there is no separate description, the execution entity of each step becomes the control system of the above-described energy storage device and a component constituting the same.

Referring to FIG. 6 , the energy management method of the present invention includes generating a load prediction value based on past data (S100), generating a load profile according to the load prediction value, and setting a peak cut using the load profile. Step (S110), the step of measuring the load value in real time (S120), the step of determining whether the load predicted value and the current load value are within a preset threshold (S130), and if within the threshold value, the current load value and the peak cut are compared (S140) ), when the current load value exceeds the peak value, calculating an optimal discharge amount (S150) and discharging driving the energy storage device (S160).

In detail, in the energy management method of the present invention, the prediction unit of the control system of the energy storage device generates a load prediction value based on past data with reference to a database or the like in the step of generating the load prediction value ( S100 ).

Next, in the step of setting the peak cut ( S110 ), the power calculator generates a load profile using the generated load prediction value, and sets the peak cut as a reference for battery charging and discharging time by using the load profile. Information on the set peak cut may be provided to the EMS of the energy storage device. And, in the step (S120) of measuring the load value in real time, the measuring unit actually measures the current load value by the load of the consumer in real time.

Next, in the step (S130) of determining whether the predicted load value and the current load value are within the preset threshold, the power calculator compares the load predicted value and the current load value at the current time to determine whether or not it deviates from the preset threshold. If it is determined, the peak cut is reset for cost saving (S110).

If it is within the threshold, as a step of comparing the current load value with the peak cut ( S140 ), the procedure is performed by dividing the case where the current load value exceeds the peak value and the case below the peak value. When the current load value exceeds the peak value, the step of calculating the optimal discharge amount (S150) and the step of discharging and driving the battery (S160) are performed.

Further, according to the determination result of step S140, when the current load value is converted to less than or equal to the peak value, in the step of charging and driving the energy storage device (S190), the energy storage device is controlled to store power from the system.

Thereafter, according to the energy management cycle (S200), if it is not terminated, step S120 may be continuously performed.

On the other hand, although not shown, according to an embodiment of the present invention, the steps of connecting to one or more other consumers in the same premises and receiving the discharge amount of the other consumers, comparing the discharge amount between the consumer and the other consumers to generate a deviation value and adjusting the calculated amount of charge or discharge according to the deviation value.

In detail, the control system of the energy storage device according to the embodiment of the present invention may be installed in a plurality of consumers connected to a local power grid, and the control systems of the consumers belonging to the same premises are connected to each other through a communication line to transmit and receive data. can do. Accordingly, in the embodiment of the present invention, the current load is transmitted/received between the control systems installed in two or more customers in the same premises.

Next, in the step of generating a deviation value by comparing the discharge amount between the consumer and other consumers, the lower-tier consumers are discharged by comparing their current load value actually measured by the upper-tier consumer among the connected consumers with the load value of the lower-tier consumer In the case of driving and the load value is higher than a certain level, the deviation between the two load values is calculated.

Thereafter, in the step of adjusting the amount of discharge calculated according to the deviation value, the amount of charge or discharge generated to control the energy storage device for the consumer is adjusted by using the deviation value calculated by the control system.

Hereinafter, the technical idea of the present invention will be described through a graph of a load value for each hour of the power grid to which the control system of the energy storage device according to the embodiment of the present invention is applied.

7 is a diagram illustrating an example of a graph of a time load value of a power grid to which a control system of an energy storage device according to an embodiment of the present invention is applied.

7, as a graph showing a peak cut value (L1) set in the daily energy storage device for an arbitrary consumer and a load value (L2) measured by time (L2), the peak cut is used for statistical analysis of the control system. It is calculated based on the load predicted value by the user, and may be calculated and set a day or several days in advance.

Here, the peak cut value L1 represents a reference value for supplying power to the load by discharging the energy storage device when the actual load exceeds the peak cut value L1.

As shown, it can be seen that the illustrated consumer gradually increases the measured load value between 7:00 am and 9:00 am, reaches the power peak p1 around noon, and has a gradually decreasing trend thereafter.

Accordingly, when the energy storage device is dischargingly driven from the point in time when the actual load value L2 exceeds the peak cut value L1, the energy storage device is driven in an on or off form, so that the load An excess amount (oc) other than the actual power demand by

In order to solve this problem, the control system according to the embodiment of the present invention calculates an appropriate discharge amount using the load value L2 measured in real time, and adjusts the discharge amount of the energy storage device in real time in response thereto. characterized in that

That is, according to the embodiment of the present invention, the discharge amount is gradually increased to the power peak (p1) point in response to the measured load value (L2) (d1 → d2), and then gradually decreased from the power peak (p1) point By doing (d2→d3), the excess amount (oc) is minimized.

As a method of adjusting the amount of discharge of the energy storage device for this purpose, an output frequency conversion or adjustment of an output current of the energy storage device may be applied.

As a method of adjusting the amount of discharge of the energy storage device for this purpose, an output frequency conversion or adjustment of an output current of the energy storage device may be applied.

8 is a diagram illustrating another example of a graph of a load value for each time of a power grid to which a control system of an energy storage device according to an embodiment of the present invention is applied.

8 is a graph showing a peak cut value (L1) set in the daily energy storage device for an arbitrary consumer and a load value (L2) measured by time, as shown, the illustrated consumer is The load value (L2) is an 'M-type peak concentration pattern' in which the first power peak p1 occurs between 11 am and 12 o'clock, and then the second power peak p2 occurs between 13:00 and 14:00. .

Accordingly, in order to minimize the excess amount (oc) generated when the energy storage device is discharged from the point in time when the actual load value (L2) exceeds the peak cut value (L1), as described above, the load value ( L2) may be used to calculate an appropriate discharge amount, and in response, the discharge amount of the energy storage device may be adjusted in real time.

That is, in response to the measured load value (L2), the amount of discharge is gradually increased to the point of the first power peak (p1) (d1 → d2), and the amount of discharge is increased at the point between the first power peak (p1) and the subsequent power peak (p2). decreases (d2→d3) and increases (d3→d4), and then decreases again from the power peak (p2) (d4→d5).

This is advantageous in that the energy storage device does not need to secure an unnecessarily large-capacity energy storage device by charging and driving the energy storage device between power peak periods.

9 is a diagram illustrating an example of a graph of a load value for each time of a power grid to which a control system of an energy storage device according to another embodiment of the present invention is applied.

Referring to FIG. 9 , assuming that the peak cut value L1 set in the daily energy storage device for an arbitrary consumer and the load value L2 measured by time are the same as in FIG. 7 , the measured load value In response to (L2), the amount of discharge is gradually increased to the power peak (p1) point (d1 → d2), and then gradually decreased from the power peak (p1) point (d2 → d3) to minimize the excess amount (oc). will do

In addition, when it is said that the energy storage device is driven by discharge because the current load value rises differently from the predicted value in the consumers of the lower layer of the consumers driven in this form, the discharge amount is further adjusted upward (c1, c2) unlike in FIG. 8 ), it is possible to minimize the sudden increase in the total power supply of customers in the same premises.

Although many matters are specifically described in the above description, these should be construed as examples of preferred embodiments rather than limiting the scope of the invention. Accordingly, the invention should not be defined by the described embodiments, but should be defined by the claims and equivalents to the claims.

10: system 20: energy storage device (ESS)
30: load 50: transformer
100: energy control system 110: measurement unit
120: prediction unit 140: power calculation unit
160: control signal generator 180: DB
210: communication unit 220: comparison unit
230: discharge amount adjustment unit

Claims (8)

As a control system of at least two energy storage devices included in the same premises by region, installed in a part of a plurality of consumers connected to the grid through the same premises power line, and connected to each other through a communication line between consumers,
a measurement unit that measures the load value for each hour in real time;
a prediction unit for generating a load prediction value indicating an hourly wattage value based on past data stored in a database;
a power calculator for generating a load profile according to the load prediction value, setting a peak cut using the load profile, and calculating an hourly charge or discharge amount of each energy storage device according to a current load value compared to the peak cut;
a control signal generator for generating a control signal for charging or discharging the energy storage device according to the calculated amount of charge or discharge;
a communication unit connected to an energy control system of an energy storage device of one or more other consumers in the same premises to receive a charge amount and a discharge amount of the other consumers;
a comparator for generating a deviation value by comparing the amount of charging and discharging between the consumer and the other consumer; and
When a sudden change occurs in the load value of one or more other consumers in the same premises, it includes a discharge amount adjusting unit that adjusts the amount of charge or discharge calculated according to the deviation value to be shared by each consumer,
The other consumer is connected to the consumer through a common connection point to the upper or lower layer,
The discharge amount adjusting unit,
When the discharge amount of other consumers in the lower tier compared to the consumer is large, the electric discharge is driven in response to the deviation value, and the number of consumers who are not equipped with an energy storage device among the consumers in the same premises and whose current load value cannot be predicted. increase the discharge amount,
The power calculator,
When the current load value compared to the load predicted value is higher than the preset threshold, the peak cut is adjusted upward, and when the current load value compared to the predicted load value is lower than the preset threshold, the peak cut is lowered, and the discharge amount adjustment unit requests Increase or decrease the amount of charge or discharge calculated according to the deviation value,
The control signal generator,
In the case of an M-type peak concentration type pattern having a plurality of power peaks according to the analysis result of the load pattern by the power calculator, a control signal for charging and driving the energy storage device during a period between a plurality of power peaks is generated,
The discharge amount adjusting unit,
Adjusting the amount of charging or discharging at any one time point among the plurality of power peaks in response to the deviation value,
The energy storage device,
PCS for converting between AC and DC and converting voltage, current, and frequency for supplying and managing the energy supplied from the power plant through the system to the power load or charging power to the battery;
EMS for monitoring the state of the battery, monitoring and controlling the state of the PCS, determining the time of charging and discharging the battery in response to the control signal, and adjusting the amount of charge or discharge; and
BMS that detects the voltage, current, and temperature of the battery to control the amount of charge and discharge of the battery to an appropriate level, performs cell balancing, and identifies the remaining capacity of the battery
A control system for an area-based energy storage device comprising a. delete delete delete delete delete delete delete

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