KR101493246B1 - Charge/discharge control apparatus and method - Google Patents

Abstract

The present invention relates to an apparatus for controlling charging of an automobile including a battery in a micro grid including a renewable energy generator. The apparatus includes a storage unit for storing power unit price information for each tolerance value, A charging unit for outputting charging power to the first vehicle and outputting a power lower than the set allowable value of the output fluctuation of the renewable energy generator to the first vehicle; And a control unit for calculating a charging charge according to a power unit price corresponding to the allowable value.

Description

{CHARGE / DISCHARGE CONTROL APPARATUS AND METHOD}

The present invention relates to a charge / discharge control device and a control method in a microgrid.

Additional energy management devices are being installed in collective power consumers such as buildings that collectively consume power to stabilize the grid. For example, a building energy system (BEMS), called a building energy management system (BEMS), controls the load or distributed power connected to the grid in a building, .

One of the most important of these additional energy management devices is a large capacity battery. In order to solve the imbalance in power supply and demand at the point of time when the production and consumption of electricity are different from each other, a device that temporarily stores the electric power and outputs the stored electric power again is needed.

A large-capacity battery means a device capable of storing a large amount of electric power in a place where the electric power collectively collects like a building. However, such a large-capacity battery can store a large amount of electric power in terms of the amount of electric power, but in many cases, it can not cope with a rapid change in current in terms of the current flowing in and out (charge / discharge current). More specifically, a large-capacity battery has been developed for storing a large amount of electric power through a stable current having a small change amount, and has an unstable aspect for an instantaneous rapidly varying current.

Also, the life of the battery is affected by the number of times of charging and discharging and the amount of charge and discharge current. It is important to reduce the flow of current with a large amount of change in order to keep the lifetime of the expensive large capacity battery long.

The above-described large currents occur frequently in the microgrid. Specifically, the load or renewable energy generator connected to the micro grid has characteristics of rapid power consumption or rapid power generation that are difficult to predict. For example, in the case of a heating / cooling load in a building, if the heating / unloading operation starts suddenly after being in an unoperated state for a long time, a sudden increase in output is caused due to a large difference between the room temperature and the set temperature. This sudden increase in output results in a sudden increase in the current flowing into the cooling / heating system. A similar situation can arise in terms of power generation, for example, when a small wind or photovoltaic generator is connected to a micro grid, such a renewable energy generator can cause a dramatic power increase depending on weather conditions . This rapid increase in output results in a drastic increase in the current flowing from the renewable energy generator to the micro grid.

Although the load or the renewable energy generator connected to the micro grid has a characteristic of rapidly changing power consumption or power generation, as described above, the large capacity battery for stabilizing the micro grid is unstable in terms of instantaneous rapidly varying current It is difficult to take all of these characteristics.

Meanwhile, as interest in the environment has increased, many vehicles including electric vehicles and batteries have been developed. These vehicles include regenerative braking devices that can reuse the energy consumed for braking. The regenerative braking system is a technology that converts energy generated by the braking of an automobile into electric energy and stores it in a battery. It can improve fuel efficiency in a vehicle that consumes a lot of energy by braking It is a breakthrough technology.

BACKGROUND ART [0002] Vehicles such as electric vehicles include a battery capable of receiving a sudden current generated in braking in order to include such a regenerative braking device.
On the other hand, the technology to be a background of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0092714.

In this context, in one aspect, an object of the present invention is to provide a technique capable of absorbing instantaneous rapidly changing current fluctuations in a microgrid.

In another aspect, an object of the present invention is to provide a technique of absorbing a rapidly varying amount of current fluctuation into an automobile battery.

In another aspect, an object of the present invention is to provide a technique for improving the lifetime of a large-capacity battery connected to a micro-grid.

In order to achieve the above object, in one aspect, the present invention provides an apparatus for controlling charging of a vehicle including a battery in a micro grid including a renewable energy generator, A storage unit for storing power unit price information by tolerance having unit price; An automobile charging unit that outputs charging power to the first vehicle and outputs power less than a set allowable value among output fluctuations of the renewable energy generator to absorb sudden output fluctuations of the renewable energy generator to the first vehicle; And a control unit for calculating a charging charge according to the power unit price corresponding to the set allowable value in the power unit price information per the allowable value with respect to the power amount output to the first vehicle.

According to another aspect of the present invention, there is provided a method of controlling charging of an automobile including a battery in a micro grid including a renewable energy generator and a large capacity battery, the method comprising the steps of: Storing power unit price information; Outputting the charging power to the first vehicle; Outputting the charging power to the second vehicle; Outputting a power less than a first allowable value of the output fluctuation of the renewable energy generator to the first vehicle to absorb a sudden output fluctuation of the renewable energy generator; Outputting power of the second renewable energy generator to the second automobile; Controlling the output of the renewable energy generator such that the charge current fluctuation amount of which is equal to or greater than a third allowable value is not output to the large capacity battery; And calculating a charge rate in accordance with the power unit price corresponding to the first tolerance value from the power unit price information per the allowable value with respect to the power amount output to the first automobile, And calculating a charging charge according to the power unit price.

According to another aspect of the present invention, there is provided an apparatus for controlling charging or discharging of an automobile including a battery in a microgrid, the apparatus comprising: a first filter for outputting or receiving a power equal to or less than a first allowable value A first output unit for outputting a first output signal; A second output section including a second filter for outputting or receiving a power equal to or lower than a second tolerance value greater than the first tolerance; And a control unit controlling the unit price of power output or input through the first output unit to be higher than a unit price of power output or input through the second output unit.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, there is an effect that instantaneous rapidly changing current fluctuations can be absorbed by the microgrid. In addition, according to the present invention, it is possible to absorb a rapidly varying amount of current fluctuation by an automobile battery and to improve the life of a large-capacity battery connected to the micro-grid.

1 is a connection diagram of components connected to a power grid in a building.
2 is an internal block diagram of a control apparatus according to an embodiment.
3 is a view for explaining factors affecting the life of a large-capacity battery.
4 is an exemplary view of an interface screen for selecting a charge current variation amount.
5 is a view for explaining a filter block of a first vehicle charging unit.
6 is an internal block diagram of a control apparatus further including a large-capacity battery charging unit.
7 is a flowchart of a control method of a control apparatus according to an embodiment.
8 is an internal block diagram of a control apparatus according to another embodiment.
9 is a view for explaining the connection relationship between the first filter, the second filter, and the large capacity battery.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected,""coupled," or "connected."

The microgrid means a small power grid and can include a distributed power source. A typical example of a micro grid is a building grid. In the following, the micro grid will be described by taking an example of a power grid in a building as an example. However, the present invention is not limited thereto. For example, the technical idea of the present invention can be applied to a micro grid, which may be operated independently of a grid (commercial power grid) like a field unit, or may be operated in combination.

1 is a connection diagram of components connected to a power grid in a building.

Referring to FIG. 1, a power grid 120 (hereinafter referred to as a building power grid) is connected to a grid 130 and receives power from the grid 130. The building power grid 120 may also supply power to the system 130.

The building power grid 120 may be connected to loads 140 consuming power and a renewable energy generator 150 generating power. In addition, a distributed power source using another energy source such as diesel may be further connected to the building power grid 120. A representative example of the loads 140 connected to the building grid 120 is a building heating / cooling system. Also, a representative example of the renewable energy generator 150 may be a small wind turbine generator or a solar generator.

The building power grid 120 may be connected to a large capacity battery 170 for eliminating power supply imbalance in time. Although the large-capacity battery 170 is sometimes referred to as an energy storage system (ESS), it is not limited to a specific type of ESS, and the form of the battery capable of storing a large amount of power is not limited to the large capacity And may correspond to the battery 170.

The large capacity battery 170 may be directly connected to the building power network 120, but may also be connected through the control unit 110 as shown in FIG. The control device 110 can control the amount of power flowing into and out of the large capacity battery 170 while being positioned between the building power network 120 and the large capacity battery 170.

Referring to FIG. 1, automobiles 160a and 160b are further connected to the building power network 120. FIG. These cars 160a and 160b are connected to the building power network 120 via the control device 110. [ The automobiles 160a and 160b include a battery therein so that the battery is substantially connected to the building power grid 120. [ The battery included in the automobiles 160a and 160b has a relatively small capacity as compared with the large capacity battery 170. [ As a result, the building power network 120 is connected to the large capacity battery 170 and one or more small capacity batteries (batteries included in the cars 160a and 160b).

2 is an internal block diagram of the controller 110 according to an embodiment.

2 (a), the controller 110 may include a storage unit 210, a car charging unit 220, a calculation unit 230, and the like. Referring to FIG. 2B, the car charging unit 220 may output power to two or more vehicles including the first car charging unit 221 and the second car charging unit 222. Of course, as an example, the car charging unit 220 may output power to N vehicles while having N subblocks (N is a natural number of 1 or more).

The storage unit 210 is a block that may internally include a memory, and may store various kinds of information necessary for the execution of the process of the controller 110. [ In particular, the storage unit 210 may store power unit price information by tolerance having different power unit prices for the allowable values of the variation of the charging current.

Charge current fluctuation tolerance Power unit price 5A / s 200 won / kwh 10 A / s 190 won / kwh 100 A / s 180 won / kwh

Table 1 is an example of power unit price information by tolerance. Referring to Table 1, information is stored that the power unit price is set at 200 won per kWh when the variation of the charging current allows a current corresponding to 5A per second. Table 1 also shows that information is set at 190 won / kwh for 10A / s and 180 won / kwh for 100A / s. The storage unit 210 may store such information in the form of a table, and may also store the information in a predetermined form.

The car charging unit 220 supplies charging currents to the connected vehicles 160a and 160b. 1, the car charging unit 220 may include two or more output units (the first car charging unit 221 and the second car charging unit 221) as shown in FIG. 2 (b) , A second car charging unit 222).

The car charging unit 220 can control the electric power delivered to the vehicle. Control of power delivered to the vehicle may vary depending on the embodiment. First, when an on-board charger is attached to a car, the car charging unit 220 can control the amount of power supplied to the car by controlling the output voltage. If there is no onboard charger in the vehicle, the vehicle charging unit 220 may control the amount of power supplied to the vehicle through current control. Of course, these configurations are merely examples and other embodiments may be derived depending on the characteristics of the car charging unit 220 and the car (battery control device characteristics inside the car).

An example in which the car charging unit 220 controls the amount of electric power for an automobile without on-board charger will be described in more detail. If the car is not equipped with an onboard charger and the battery of the car is configured to be directly connected to the outside through the connector, the car charging unit 220 must supply DC current to the battery of such car. Since the battery voltage of the vehicle is maintained at a constant level, the car charging unit 220 controls the amount of electric power by controlling the amount of electric current.

An example in which the vehicle charging unit 220 controls the amount of electric power for a vehicle having an on-board charger will also be described. When an automobile is equipped with an onboard charger, the onboard charger has the function of converting the voltage of the power input to the car to match the characteristics of the car battery. Therefore, at this time, the car charging unit 220 can control the power output to the vehicle while changing the voltage regardless of the voltage of the automobile battery.

The control unit 230 performs all the control functions necessary for executing the process of the control device 110. [ In particular, the control unit 230 performs a function of calculating the charging charge for the car that has performed the charging. The power unit price used in the calculation of the charge rate may be based on the power unit price information per tolerance stored in the storage unit 210. [

3 is a view for explaining factors affecting the life of a large-capacity battery.

3 (a) is a graph showing a state of charge (SOC) of the large capacity battery 170. As shown in FIG. Referring to FIG. 3 (a), the large capacity battery 170 maintains the SOC between 50% and 90%. The large capacity battery is in an appropriate state (for example, SOC 50% to 90%) when charging / discharging is performed in an overcharged state (for example, SOC 90% or more) or an overdischarged state (for example, SOC 50% May lead to a longer life time than when charge / discharge is performed. For this reason, when the state of charge of the large capacity battery 170 is equal to or higher than a predetermined value, it may be advantageous to increase the life of the large capacity battery 170 by not supplying the charging current to the large capacity battery 170.

3 (b) is a graph showing the current supplied to the large-capacity battery. Referring to FIG. 3 (b), the current rises sharply (a portion indicated by a slope 1) in a certain section, but falls sharply (a portion indicated by a slope 2). The lifetime of the large capacity battery 170 can be reduced in such a period that the charge current is abruptly changed.

The lifetime reduction factors of the large capacity battery 170 described with reference to FIG. 3 may be analogous to the electrochemical characteristics of the large capacity battery 170. In the case of the large capacity battery 170, in order to increase the storage capacity, the distance between the electrodes can be decreased. At this time, when the charge current is rapidly changed, A charge current is supplied to the reactor, and a side reaction is generated instead of a normal reaction. This side reaction shortens the lifetime of the large capacity battery 170 by producing precipitate materials that do not return to the original state by charging and discharging. It can be understood that the reaction in the overdischarge state or the overcharge state shortens the lifetime of the large capacity battery 170 in a similar manner.

The load 140 or the renewable energy generator 150 connected to the building power grid 120 may have an unpredictable sudden current fluctuation power consumption or behavior of power generation. Embodiments of the present invention provide a technique for preventing sudden current fluctuations in the resulting building power grid 120 from being delivered to the large capacity battery 170. [ For this, the controller 110 controls the car charging unit 220 so that abrupt current fluctuation is transmitted to the car battery rather than the large capacity battery 170.

The car battery is designed for a different purpose than the large capacity battery 170, and its characteristics are different from the large capacity battery 170. [ Automotive batteries are designed to absorb or supply rapidly varying currents. Electric vehicles, hybrid vehicles, and fuel cell vehicles have a regenerative braking function. The regenerative braking function is a function of converting the inertia energy of an automobile, which is emitted while the vehicle is stopped, into electric energy and storing it as a battery. At this time, the automobile is designed so as to sufficiently absorb the current generated in situations such as emergency brakes. For this purpose, the automobile is provided with a battery capable of appropriately absorbing a rapidly fluctuating current.

Such an automotive battery also has the ability to supply rapidly varying currents, which is the capability required when the electric motor fully compensates for rapid acceleration in a stationary state or when the electric motor functions as a torque assistance to be.

Embodiments of the present invention provide a technique for delivering abrupt current fluctuations in the building power network 120 to an automotive battery that is suitably capable of absorbing such currents.

However, unlike the large capacity battery 170, the automobile battery is not a device that is always attached to the building power network 120, nor is it a device that can provide a rapidly varying current to the building manager. For this reason, the building manager needs to be informed that the car connected to the building grid 120 may receive a current variation tolerance acceptable to the car user, or that the car user may be supplied with a current variation below a certain limit. In addition, there is a need to provide incentives for automobiles that are allowed to supply such abrupt current fluctuations.

4 is an exemplary view of an interface screen for selecting a charge current variation amount.

The control device 110 can confirm or set the allowable charge current variation amount to the automobile connected to the vehicle charging part 220 through the interface screen as shown in FIG.

Referring to FIG. 4, the interface screen may display a selection button for the amount of charge current variation and a power unit price for each charge current variation tolerance value. For example, next to the charge current variation tolerance button for 5A / s, you can display 200 won / kwh. In the same way, you can display 190 won / kwh next to the 10A / s button and 180 won / kwh next to the 100A / s button.

The control device 110 may configure the interface screen according to the power unit price information by the tolerance value stored in the storage unit 210. [ The interface screen shown in FIG. 4 is configured based on the contents shown in Table 1.

The control device 110 can calculate the charge rate at a lower power cost for the vehicle that allows a larger amount of current fluctuation. As shown in FIG. 4, the charge rate can be calculated at a power unit price of 180 won / kwh which is 10% lower than that of 5A / s at 100A / s.

In the above-described example, the amount of current variation is expressed through the slope of the current, but the amount of current variation can be expressed in the form of frequency. For example, a current having a fluctuation of 1 Hz is larger than a current having a fluctuation of 0.1 Hz.

Charge current fluctuation tolerance Power unit price 100Hz 200 won / kwh 1KHz 190 won / kwh 10KHz 180 won / kwh

Accordingly, the storage unit 210 stores power unit price information for each tolerance value, the power unit price of which is determined differently according to the tolerance expressed in the form of frequency as shown in Table 2, and the controller 230 uses the power unit price information So that the charge rate can be calculated.

The variation of the charging current in the building power network 120 may be caused by the renewable energy generator 150. The vehicle charging unit 220 can output power less than the set allowable value of the output fluctuation of the renewable energy generator 150 to the automobile in order to absorb abrupt output fluctuation of the renewable energy generator 150. [ The control unit 230 can calculate the charge rate according to the power unit price corresponding to the set allowable value, based on the power unit price information per the allowable value stored in the storage unit 210 with respect to the electric power output from the vehicle.

The car charging unit 220 outputs power less than or equal to another tolerance among output fluctuations of the renewable energy generator 150 according to the setting change. The control unit 230 changes the power unit price information The charge rate can be calculated according to the power unit price.

At this time, the car charging unit 220 may include two or more filters having different filtering bands, and may output power through one of the filters according to the set tolerance. 2 (b), when the vehicle charging unit 220 includes a plurality of lower charging units, each of the lower charging units (the first charging unit 221 and the second charging unit 221 in FIG. 2 (b) 2 car charging unit 222) may include two or more filters having filtering bands of different frequencies.

5 is a view for explaining a filter block of the first automobile charging part 221. As shown in FIG.

Referring to FIG. 5, the first vehicle charging unit 221 receives power from the building power network 120 and delivers the power to the first vehicle 160a. At this time, the first car charging unit 221 may include a filter block in which three filters are connected in parallel. In this case, the first filter 510 may be a filter that passes the lowest permissible power, and the third filter 530 may be a filter that passes the highest permissible power. And, the second filter 520 may have an intermediate value thereof.

The selection for each filter may be determined by the user's choice. The user can determine the tolerance value on the interface screen as shown in FIG. 4, and the first car charging section 221 can select the corresponding filter according to the determined tolerance value.

The car charging unit 220 may include a filter for which the filtering band is changed according to a setting as another example. The car charging unit 220 including such a filter can control the filters to have different filtering bands according to the set allowable values.

The car charging unit 220 may output power in proportion to the output of the renewable energy generator 150 within the set tolerance. For example, when the renewable energy generator 150 outputs power at 11 A / s and the first car 160a is set at a tolerance of 10 A / s, the car charging unit 220 is connected to the renewable energy generator 150 can be output to the first vehicle 160a within a range of 10A / s. In this case, only the power of 1A / s of the output of the renewable energy generator 150 affects other devices. If this value is a small value less than the limit, it becomes negligible.

6 is an internal block diagram of a control apparatus further including a large-capacity battery charging unit.

Referring to FIG. 6, the controller 110 further includes a large capacity battery charging unit 610. The large capacity battery charging unit 610 may prevent the sudden current fluctuation generated in the building power network 120 from being transmitted to the large capacity battery 170 or may cause the large capacity battery 170 Or more can be controlled so that the charging current is not supplied.

The large capacity battery charging unit 610 may be configured such that the amount of charge current variation during the output variation of the renewable energy generator 150 is equal to or greater than a predetermined value The battery 170 can be controlled so as not to be output to the large capacity battery 170. [ The electric power corresponding to the predetermined value or more can be supplied to the car battery by the car charging unit 220.

When the state of charge of the large capacity battery 170 is equal to or greater than a predetermined value, the large capacity battery charging unit 610 controls the output of the large capacity battery 170 so that the output fluctuation of the renewable energy generator 150 is not output to the large capacity battery 170 It is possible.

7 is a flowchart of a control method of a control apparatus according to an embodiment.

The control method described with reference to Fig. 7 is a method that can be all performed by the above-described control device 110, and includes the control method described with reference to Figs. 1 to 6 and the embodiments of the control method described below, May be combined with one another to form another embodiment.

Referring to FIG. 7, the controller 110 stores power unit price information for each tolerance value having a different power unit price for each allowable value of the charge current variation amount (S710).

Then, the control device 110 outputs the charging power to the first vehicle 160a (S720) and outputs the charging power to the second vehicle 160b (S730).

1, the controller 110 is connected to a building power network 120, and a renewable energy generator 150 is connected to the building power network 120. [ The renewable energy generator 150 can output power having a sudden current fluctuation to the building power network 120.

The control device 110 controls the output of the renewable energy generator 150 so that the amount of charge current fluctuation that is equal to or greater than the third allowable value is not output to the large capacity battery 170 in step S740. The third allowable value is determined according to the characteristics of the large capacity battery 170, and may be transmitted to the controller 110 according to a user input.

The controller 110 controls the power of the renewable energy generator 150 to be less than the first allowable value of the output fluctuation of the renewable energy generator 150 to absorb the abrupt output fluctuation of the renewable energy generator 150 connected to the building power grid 120 (S750), and outputs a power equal to or less than a second allowable value of the output fluctuation of the renewable energy generator 150 to the second vehicle 160b (S760). At this time, the first tolerance value and the second tolerance value may be transmitted to the control device 110 according to the usage input. For example, before step S750, the control device 110 may receive tolerance information on the amount of charge current variation from the first car 160a.

The control device 110 calculates the charge rate according to the power unit price corresponding to the first allowable value in the power unit price information per the allowable value with respect to the electric power output to the first car 160a, The charging fee is calculated according to the power unit price corresponding to the second allowable value (S770).

Meanwhile, the controller 110 outputs power using the filter in step S750 and further includes a step (not shown) of adjusting the filtering band of the filter to a frequency corresponding to the first allowable value before step S750 .

8 is an internal block diagram of a control apparatus according to another embodiment.

8, the control device 800 includes a first output unit 810, a second output unit 820, and a control unit 830. [ The control device 800 may have the same connection relationship as the control device 110 shown in FIG. 1 in connection with the building power network 120 and its peripheral devices. Further, the embodiments of the control device 110 described with reference to Figs. 1 to 7 can be applied to the control device 800 according to another embodiment, so long as they do not collide with each other between the embodiments.

The first output unit 810 may include a first filter that outputs or receives power below the first tolerance for the amount of current variation, and the second output unit 820 may include a second filter having a value greater than the first tolerance, And may include a second filter that outputs or receives power below a tolerance level.

The control unit 830 may control the unit price of the power output or input through the first output unit 810 to be higher than the unit price of the power output or input through the second output unit 820.

Accordingly, the second vehicle 160b connected to the second output unit 820 and supplied with the charging current is connected to the first output unit 810, and compared with the first vehicle 160a supplied with the charging current, Can be supplied with a large charging current. Instead, the second car 160b can charge at a cheaper charge rate than the first car 160a.

The first tolerance value at the first output unit 810 or the second tolerance value at the second output unit 820 may be changed but may not be a value set according to the user's selection. For example, the control device 800 can fix the tolerance of the first output unit 810 and output the power with the allowable value.

The controller 800 controls the capacity of the large capacity battery 170 connected to the building power network 120 such that power corresponding to a sudden load variation in the building is not supplied from the large capacity battery 170, Capacity battery control unit (930 in FIG. 9) for controlling the output of the large-capacity battery 170 so as not to be output from the large-capacity battery 170.

9 is a view for explaining the connection relationship between the first filter, the second filter, and the large capacity battery.

9, a second output unit 820 including a second filter 920 and a second output socket 925 is first connected to the building power network 120 and a second output socket 925 The second vehicle 160b is connected.

A first filter 910 is connected in series to an output terminal of the second filter 920. The first output 810 including the first filter 910 and the first output socket 915 is then connected to the building power network 120 after the second output 820. Also, the first car 160a is connected to the first output socket 915.

A large capacity battery controller 930 is connected to an output terminal of the first filter 910 and a large capacity battery 170 is connected in series to an output terminal of the large capacity battery controller 930.

The power exceeding the first tolerance and below the second tolerance is transmitted to the second automobile 160b and the power below the first tolerance is transmitted to the first automobile 160a and the second automobile 160b, .

The large capacity battery 170 receives only the electric power that has passed through the second filter 920 and the first filter 910 and is controlled by the large capacity battery controller 930.

In the micro grid according to the above-described embodiments, a rapidly varying current is absorbed by an automobile battery, and a large capacity battery is charged and discharged for a long period of time. As a result, the large capacity battery has a short life span because the number of charge / discharge cycles is reduced and the battery does not accept a sudden current change.

In addition, the above-described embodiment provides an environment in which a car battery can be connected to a micro grid by providing an incentive depending on a charging price to a vehicle that absorbs a sudden current change.

As a result, automobile operators can charge at a low cost, and the micro grid has a stable operation of the power grid.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (14)

An apparatus for controlling charging of a vehicle including a battery for regenerative braking in a micro grid including a renewable energy generator and a large capacity battery,
A storage unit for storing power unit price information for each tolerance value having a different power unit price for each tolerance of the charge current variation per unit time;
An automobile charging unit that outputs charging power to a first automobile and absorbs some or all of output fluctuations of the renewable energy generator. The charging power output to the first automobile is greater than a first tolerable value and less than or equal to a second permitted value Controlled to have power fluctuations;
A large capacity battery charging unit that outputs charging power to the large capacity battery and absorbs some or all of output fluctuations of the renewable energy generator that are not absorbed by the first vehicle; And
A controller for calculating a charge rate according to a power unit price corresponding to the second allowable value from the power unit price information per the allowable value with respect to the electric power outputted to the first vehicle,
.
The method according to claim 1,
The vehicle-
And outputs a power that is less than or equal to another permissible value among output fluctuations of the renewable energy generator according to the setting change,
Wherein the control unit calculates the charge rate according to the power unit price corresponding to the different allowable value from the power unit price information per the allowable value according to the setting change.
3. The method of claim 2,
The vehicle-
And controls the filter to have filtering bands of different frequencies according to the set tolerance value.
3. The method of claim 2,
The vehicle-
Wherein the at least one filter includes at least two filters having different filtering bands and outputs the filtered signals through one of the filters according to a set tolerance.
The method according to claim 1,
The vehicle-
And outputs power in proportion to an output of the renewable energy generator within a range of the second allowable value.
The method according to claim 1,
The large capacity battery charging unit includes:
Wherein the control unit controls the output of the renewable energy generator so that the power whose fluctuation amount of the charge current per hour is equal to or more than a predetermined value is not output to the large capacity battery.
The method according to claim 1,
The large capacity battery charging unit includes:
Wherein the control unit controls the output of the renewable energy generator to prevent the output fluctuation of the large capacity battery from being output to the large capacity battery when the state of charge of the large capacity battery is equal to or greater than a predetermined value.
CLAIMS 1. A method for controlling charging of an automobile including a regenerative braking battery in a micro grid including a renewable energy generator and a large capacity battery,
Storing power unit price information for each tolerance value having different power unit prices for each tolerance of charging current variation per unit time;
Outputting a charge power having a power variation less than or equal to a first allowable value among output variations of the renewable energy generator to the first vehicle so as to absorb abrupt output fluctuation of the renewable energy generator;
Outputting a charging power having a power variation greater than a first allowable value and less than or equal to a second permissible value among output variations of the renewable energy generator to a second automobile;
Controlling the output of the renewable energy generator such that the charge current fluctuation amount of which is equal to or greater than a third allowable value is not output to the large capacity battery; And
Calculating a charge rate according to a power unit price corresponding to the first allowable value from the power unit price information per the allowable value with respect to the amount of power output to the first vehicle, Calculating charge rate according to power unit price
≪ / RTI >
9. The method of claim 8,
Before the step of outputting power below the first tolerance to the first vehicle,
Further comprising the step of receiving tolerance information on a charge current variation amount from the first vehicle.
9. The method of claim 8,
In the step of outputting the power below the first allowable value to the first vehicle,
A filter is used to output power,
Before the step of outputting power below the first tolerance to the first vehicle,
And adjusting the filtering band of the filter to a frequency corresponding to the first allowable value.
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