KR101776997B1 - Direct current(dc) micro-grid system and control method thereof - Google Patents

Direct current(dc) micro-grid system and control method thereof Download PDF

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KR101776997B1
KR101776997B1 KR1020150069704A KR20150069704A KR101776997B1 KR 101776997 B1 KR101776997 B1 KR 101776997B1 KR 1020150069704 A KR1020150069704 A KR 1020150069704A KR 20150069704 A KR20150069704 A KR 20150069704A KR 101776997 B1 KR101776997 B1 KR 101776997B1
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converter module
power
amount
converter
converters
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KR1020150069704A
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Korean (ko)
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KR20160136040A (en
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이환희
김상협
류태형
신동훈
정회국
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주식회사 엘지씨엔에스
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J2001/002—

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A DC-DC converter module including one or more DC-DC converters for charging or discharging one or more batteries, a DC-DC converter module including one or more DC-AC converters for providing power supplied from an AC power grid to a DC- DC converter module, and a DC-DC converter module, and a power control device for controlling at least one of a DC-DC converter module and a DC-AC converter module by monitoring at least one of a power consumption of the DC-DC converter module and a power supply amount of the DC- To provide a DC microgrid system that includes the < RTI ID = 0.0 >

Description

Technical Field [0001] The present invention relates to a DC micro-grid system and a control method thereof,

The following embodiments relate to a DC micro-grid system, and more particularly, to a DC micro-grid system and a control method thereof that increase power efficiency by a power control device and stably supply power to a DC micro- ≪ / RTI >

In a typical direct current (DC) charge and discharge system, the DC-to-DC converters and DC-to-AC converters connected to the battery (s) must always be active, regardless of the capacity required to charge or discharge the battery . In this case, since the DC-DC converter and the DC-AC converter are connected in series, a DC-DC converter connected to the failed DC-AC converter can not be used if any DC-AC converter fails.

In addition, DC charging and discharging systems operate all the DC-AC converters irrespective of the power consumption required in the DC network, resulting in unnecessary consumption of standby power and shortening the life span of the equipment.

According to one embodiment, power consumption of the DC micro-grid network is minimized, and power can be supplied stably even when the DC-DC converter module uses instantaneous high-power.

According to one embodiment, the lifetime of the components included in the DC microgrid system can be increased.

According to one embodiment, failure repair, other maintenance, and capacity expansion can be easily performed without stopping the operation of the DC micro-grid system.

According to one embodiment, a DC microgrid system includes one or more batteries; A DC-DC converter module including at least one DC-DC converter for charging or discharging the battery; A DC-AC converter module including at least one DC-AC converter that provides power supplied from an AC power grid to the DC-DC converter module; And a power control device for controlling at least one of the DC-DC converter module and the DC-AC converter module by monitoring at least one of a power consumption amount of the DC-DC converter module and a power supply amount of the DC- .

The DC micro-grid system may further include a DC micro-grid network connected to the DC-DC converter module.

The power control device may control the operation of the DC-DC converter module so that a current corresponding to a required capacity is supplied to the DC-DC converter module or a DC micro-grid network connected to the DC-DC converter module.

The power control apparatus monitors at least one of a power consumption amount of the DC-DC converter module and a power supply amount of the DC-AC converter module, and based on the monitoring result, the DC-DC converter module and the DC- A DC network power controller for controlling at least one of the operations; And an energy storage system (ESS) for storing a current discharged by the DC-DC converter module.

The DC network power controller may monitor the amount of power used by the DC-DC converter module when the battery or load is powered from the DC-DC converter module.

The DC network power controller can control the operation of the DC-AC converter module to supply the power consumption required by the DC-DC converter module based on the monitoring result.

Wherein the DC network power controller determines a total planned use amount required for charging or discharging the battery based on the information received from the DC-DC converter module, The total supply power can be compared.

The information received from the DC-DC converter module includes at least one of a used power amount of the DC-DC converter for charging or discharging the battery and a used power estimation amount of the standby DC-DC converter for charging or discharging the battery .

The DC network power controller determines the number of the DC-AC converters to be further activated or to be stopped and the presence or absence of charging or discharging of the energy storage system based on the comparison result between the total planned use amount and the total supplied power amount The DC-AC converter module and the energy storage system.

Wherein the DC network power controller reduces the number of the DC-AC converters that are activated when the power capacity stored in the energy storage system is equal to or greater than a predetermined reference, and transmits the power stored in the energy storage system to the DC- Micro grid network can be supplied.

The energy storage system may stabilize the DC micro-grid network by charging or discharging the power stored in the energy storage system when instantaneous high power is used in the DC-DC converter module.

According to one embodiment, a power control apparatus including an energy storage system comprises a DC-DC converter module comprising at least one DC-DC converter connected to one or more batteries, a use of a DC-DC converter for charging or discharging the battery A receiving unit receiving information on at least one of a power amount and a used power estimation amount of a standby DC-DC converter for charging or discharging the battery; AC converter module according to the result of the comparison, and determines the number of DC-AC converters to be operated according to the result of the comparison and the presence or absence of charging or discharging of the energy storage system, ; And a transmitter for transmitting a signal controlling the DC-AC converter module and the energy storage system according to the determination.

The processor may determine the number of the DC-AC converters to be operated further if the total planned amount of use is larger than the total supplied power amount as a result of the comparison.

The processor may determine the number of DC-AC converters to stop the operation if the total planned amount of use is less than or equal to the total supplied power amount as a result of the comparison.

The processor determines the charging of the energy storage system when the total usage amount is smaller than a preset value and activates the waiting DC-DC converter to charge or discharge the battery when the energy storage system is charged .

According to one embodiment, a method of controlling a power control apparatus is based on information received from a DC-DC converter module that includes one or more DC-DC converters, ; AC converter module that includes the DC-DC converter module or one or more DC-AC converters that supply power to a DC micro-grid network connected to the DC-DC converter module and the total used power amount of the DC- step; Determining the number of DC-AC converters to be further activated or to be stopped, and the presence or absence of charging or discharging of the energy storage system based on the comparison result; And controlling operation of the DC-AC converter module and the energy storage system according to the determination.

Wherein the step of determining the total usage amount includes: receiving a usage amount of the DC-DC converter that charges or discharges the battery from the DC-DC converter module; Receiving a usage power estimate of a pending DC-DC converter to charge or discharge the battery from the DC-DC converter module; And determining the total usage amount by summing the usage power amount and the usage power estimation amount.

Wherein the step of determining the number of the DC-AC converters includes a step of determining the number of DC-AC converters to be further operated according to the unit capacity of the DC-AC converter when the total planned use amount is larger than the total supplied power amount And a step of determining the number

Wherein the step of determining the number of the DC-AC converters includes a step of determining the number of the DC-AC converters to be stopped according to the unit capacity of the DC-AC converter when the total planned use amount is less than or equal to the total supplied power amount And determining the number.

The determining whether to charge or discharge the energy storage system may further include determining charging of the energy storage system when the total planned amount of use is less than a predetermined value.

The control method of the power control apparatus may further include, after charging the energy storage system, activating a standby DC-DC converter to charge or discharge the battery.

According to one aspect of the present invention, the power consumption of the DC micro-grid network can be minimized by the power control device.

According to one aspect of the present invention, when an instantaneous high power is used in the DC-DC converter module, the DC power can be stably supplied to the DC micro-grid network by the energy storage system.

According to one aspect of the present invention, the operating time of the DC-AC converters included in the DC microgrid system can be adjusted to increase the lifetime.

According to one aspect of the present invention, failure repair, capacity expansion, and other maintenance can be easily performed without stopping the operation of the DC micro-grid system.

1 is a configuration diagram of a DC micro-grid system according to an embodiment;
2 is a configuration diagram and a control flowchart of a power control apparatus according to an embodiment.
3 is a block diagram of a power control apparatus according to one embodiment.
4 is a flowchart illustrating a method of controlling a power control apparatus according to an embodiment;
5 is a flowchart illustrating a control method of a power control apparatus according to another embodiment;

In the following, embodiments will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

Various modifications may be made to the embodiments described below. It is to be understood that the embodiments described below are not intended to limit the embodiments, but include all modifications, equivalents, and alternatives to them.

The terms used in the examples are used only to illustrate specific embodiments and are not intended to limit the embodiments. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this embodiment belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. In the following description of the embodiments, a detailed description of related arts will be omitted if it is determined that the gist of the embodiments may be unnecessarily blurred.

1 is a configuration diagram of a DC micro-grid system according to an embodiment.

1, a DC micro-grid system 100 according to one embodiment includes at least one battery 110, a DC-DC converter module 120, a DC micro-grid network 130, a DC-AC converter module 140 ), And a power control device 160.

One or more batteries 110 are connected to the DC-DC converter module 120. At this time, the battery 110 may be connected to the DC-DC converter included in the DC-DC converter module 120 in a one-to-one correspondence.

The DC-DC converter module 120 includes one or more DC-DC converters that charge or discharge the battery 110. If the DC-DC converter included in the DC-DC converter module 120 fails, the failed DC-DC converter can be separated and repaired.

The DC microgrid network 130 may be connected between the DC-DC converter module 120 and the DC-AC converter module 140.

The DC-AC converter module 140 is connected between the DC microgrid network 130 and the AC power grid 150. The DC-AC converter module 140 includes one or more DC-AC converters and provides the power supplied from the AC power grid 150 to the DC-DC converter module 120. The DC-AC converter module 140 may convert the AC current received from the AC power grid 150, for example, into a DC current and supply it to the DC-DC converter module 120.

1, the DC-AC converter module 140 converts the power supplied from the AC power grid 150 to DC micro-grid network 130, when the DC micro-grid network 130 is connected to the DC-DC converter module 120, (130). At this time, the DC-DC converter module 120 may be connected to various power networks other than the DC micro-grid network 130, and is not limited to the DC micro-grid network 130.

If the DC-AC converter included in the DC-AC converter module 140 fails, the failed DC-AC converter can be separated and repaired.

The power control unit 160 monitors at least one of the power consumption of the DC-DC converter module 120 and the power supply amount of the DC-AC converter module 140 to control the DC-DC converter module 120 and the DC- (140).

The power control unit 160 controls the amount of current required in the DC micro-grid network 130 connected to the DC-DC converter module 120 or the DC-DC converter module 120 when the battery 110 is charged or discharged. AC converter module 140 can be controlled so that the DC-AC converter module 140 is supplied.

2 is a configuration diagram and a control flowchart of a power control apparatus according to an embodiment.

Referring to FIG. 2, a power control apparatus 200 according to an embodiment includes a DC network power controller 210 and an energy storage system (ESS) 230.

The DC network power controller 210 is connected to the DC-DC converter module 120, the DC-AC converter module 140, and the energy storage system 230, for example, Ethernet communication, CAN communication, , And can be connected through wireless communication. The DC network shown in FIG. 2 refers to various power networks that can be connected to the DC-DC converter module 120, and is not limited to the DC micro-grid network.

The DC network power controller 210 may monitor at least one of the power consumption of the DC-DC converter module 120 and the power supply of the DC-AC converter module 140. The DC network power controller 210 may control the operation of at least one of the DC-DC converter module 120 and the DC-AC converter module 140 based on the monitoring result.

The DC network power controller 210 may monitor the amount of power used by the DC-DC converter module 120 when the battery 110 or the load is supplied with power from the DC-DC converter module 120 . More specifically, the DC network power controller 210 may monitor the amount of power used by each DC-DC converter included in the DC-DC converter module 120 for a predetermined time.

The DC network power controller 210 may control the operation of the DC-AC converter module 140 to supply the power consumption required by the DC-DC converter module 120 based on the monitoring result.

The DC network power controller 210 according to one embodiment controls the operation of the DC-DC converter module 120 and the DC-AC converter module 140 so that the life of the equipment (DC-DC converter and DC-AC converter) And improve power efficiency.

The energy storage system 230 may store the current that the DC-DC converter module 120 discharges.

When the energy storage system 230 is directly regenerated to the AC micro-grid network when the discharge current of the DC-DC converter belonging to the DC-DC converter module 120 is regenerated, power consumption and heat generation due to the efficiency of the DC- Lt; / RTI > In this case, if the discharge current of the DC-DC converter is stored in the energy storage system 230 without regenerating, the power can be regenerated without power consumption by the efficiency of the DC-AC converter. The energy storage system 230 may then supply the stored current back to the required DC-DC converter.

Overcharge or undershoot can occur in the DC micro-grid network when the DC-DC converter is momentarily charged or discharged with high power. In this case, in one embodiment, the DC micro-grid network can be stabilized through the charging or discharging function of the energy storage system 230 to protect the durability and power quality of each of the DC-DC converter and the DC-AC converter.

When the power capacity stored in the energy storage system 230 is equal to or greater than a predetermined reference level, the DC network power controller 210 reduces the number of currently operating DC-AC converters and supplies the power stored in the energy storage system 230 to the DC- DC converter module 120 or a DC microgrid network. Here, the predetermined criterion may vary depending on the allowable SOC (%) of the battery, and may be, for example, 90% to 95%.

The DC network power controller 210 controls the DC-DC converter module 120, the DC-AC converter module 140, and the energy storage system 230 as follows.

The DC network power controller 210 receives from the DC-DC converter module 120 the amount of power used by the DC-DC converter module 120 charging or discharging the battery 110 and the amount of power used by the DC- The DC-DC converter module 120 may receive information including the expected power usage of the DC-DC converter module 120 (S201).

The 'used power amount' of the DC-DC converter module 120 represents the total used power amount of the DC-DC converters that are charging or discharging the battery 110 among the DC-DC converters belonging to the DC-DC converter module 120.

The amount of electric power to be used can be obtained by the following Equation (1).

Figure 112015047868306-pat00001

DC-DC converter module 120 may use DC-DC converters waiting for charging or discharging the battery 110 among the DC-DC converters belonging to the DC-DC converter module 120 Indicates expected power usage.

DC network power controller 210 may determine a total planned amount of use required to charge or discharge battery 110 based on the information received from DC-DC converter module 120. [ The total planned use amount can be obtained by summing up the amount of power used and the estimated power usage.

The DC network power controller 210 determines the number of DC-AC converters to additionally operate or stop the operation by comparing the total planned amount of use and the total supplied power amount of the DC-AC converter module 140, AC converter module 140 and the energy storage system 230 by determining the presence or absence of charging or discharging of the battery 230 in step S203. At this time, the total amount of supplied power of the DC-AC converter module 140 can be understood as the total amount of power supplied from the DC-AC converter module 140 that is supplying power to the DC-DC converter module 120 or the DC micro- have.

For example, if the total planned amount of use is greater than the total supplied power amount, the DC network power controller 210 controls the DC-AC converter to be further operated in the DC-AC converter module 140 according to the unit capacity of the DC- The number can be determined. The DC network power controller 210 may perform charging or discharging of the energy storage system 230 by a predetermined parameter in the policy. At this time, the predetermined variable in the policy may be, for example, the discharge SOC% of the energy storage system 230, the discharge allowable power amount of the energy storage system 230, or the maximum SOC% of the energy storage system 230.

If the SOC% of the energy storage system 230 is greater than or equal to the SOC% of the discharge of the energy storage system 230, the DC network power controller 210 may determine that the energy storage system 230 is in an energy storage system 230 can be discharged. At this time, the DC network power controller 210 can secure the amount of power equivalent to the discharge allowable power amount without operating the DC-AC converter.

For example, assume that the unit capacity of a DC-AC converter is 500 KW, the total amount of DC-AC converter to be used is 700 KW, and one DC-AC converter is currently in operation.

Currently, one DC-AC converter supplies 500 KW to the DC micro-grid network, so an additional supply of 200 KW is needed considering the total planned amount of DC-AC converter. At this time, the DC network power controller 210 may control one DC-AC converter to operate additionally, but it may also allow the energy storage system 230 to supply 200 KW to the DC micro-grid network according to policy. In this case, the DC network power controller 210 does not need to further operate the DC-AC converter.

If the total planned use amount is smaller than or equal to the total supplied power amount, the DC network power controller 210 sets the number of DC-AC converters to be stopped in the DC-AC converter module 140 according to the unit capacity of the DC- You can decide. At this time, if the total planned use amount is smaller than a predetermined value (for example, 0), the DC network power controller 210 can execute charging of the energy storage system 230 by a predetermined parameter in the policy. Here, when the total planned use amount is smaller than 0, it indicates that the discharge electric power amount of the battery is larger than the charged electric power amount.

If the SOC% of the energy storage system 230 is less than the maximum SOC% of the energy storage system 230, then the DC network power controller 210 may control the energy storage system 230 by the amount of charge- Can be performed. At this time, the DC network power controller 210 can secure the amount of power equivalent to the charge allowable power amount without operating the DC / AC converter.

For example, suppose that the unit capacity of a DC-AC converter is 500 KW, the total planned amount is 400 KW, and the current is supplied to the DC micro-grid network by two DC-AC converters at 1000 KW.

In this case, since the total planned use amount is 400 KW, the DC network power controller 210 can supply power to the entire DC micro-grid network with only one 500 KW DC-AC converter, so that one of the two DC- Can be stopped. At this time, when charging 400 KW by the energy storage system 230 according to the policy, the DC network power controller 210 does not have to stop the operation of one DC-AC converter.

The DC network power controller 210 may control the operation of the DC-AC converter module 140 via wired or wireless communication according to the determination of S203 (S205). At this time, it can be understood that 'controlling the operation of the DC-AC converter module 140' determines the number of DC-AC converters to be operated in the DC-AC converter module 140.

In addition, the DC network power controller 210 may control charging or discharging of the energy storage system 230 through radio communication in accordance with the determination of S203 (S207).

The DC network power controller 210 may control the operation of the standby DC-DC converter to charge or discharge the battery 110 through wired or wireless communication (S209).

3 is a block diagram of a power control apparatus according to one embodiment.

3, a power control apparatus 300 according to an exemplary embodiment of the present invention may include a receiving unit 310, a processor 330, a transmitting unit 350, and an energy storing system 370.

The receiving unit 310 receives from the DC-DC converter module at least one of the used power amount of the DC-DC converter for charging or discharging the battery and the used power estimation amount of the waiting DC-DC converter for charging or discharging the battery do. The DC-DC converter module includes one or more DC-DC converters coupled to one or more batteries.

The processor 330 compares the total usage amount of the DC-AC converter module with the total usage amount based on at least one piece of information received from the receiver 310. [ The processor 330 determines the number of DC-AC converters to be further activated, or to stop the operation, depending on the comparison result, and whether the energy storage system is charged or discharged.

The processor 330 can obtain the total planned use amount required for charging or discharging the battery by summing up the used power amount and the expected power use amount.

The DC-AC converter module powers the DC micro-grid network connected to the DC-DC converter module or the DC-DC converter module.

As a result of the comparison, when the total planned amount of use is greater than the total supplied power amount, the processor 330 can determine the number of DC-AC converters to be further operated according to the unit capacity of the DC-AC converter. As a result of the comparison, if the total planned use amount is less than or equal to the total supplied power amount, the processor 330 can determine the number of DC-AC converters to be stopped.

The processor 330 may determine the charging of the energy storage system if the total planned amount of use is less than a predetermined value (e.g., 0). Once the energy storage system is charged, the processor 330 may activate a pending DC-DC converter to charge or discharge the battery.

Transmitter 350 transmits a signal to control DC-AC converter module and energy storage system 370 in accordance with the determination of processor 330. [

4 is a flowchart illustrating a method of controlling a power control apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 4, a power control apparatus according to an exemplary embodiment determines a total usage amount required to charge or discharge one or more batteries based on information received from the DC-DC converter module (410). The DC-DC converter module includes one or more DC-DC converters.

The power control unit compares the total power supply amount of the DC-AC converter module with the total planned use amount (420). At this time, the DC-AC converter module may include a DC-DC converter module or one or more DC-AC converters that supply power to the DC micro-grid network.

Based on the comparison result of step 420, the power control device determines 430 the number of DC-AC converters to be further activated, or to stop operation, and whether the energy storage system is charged or discharged.

The power control unit controls operation of the DC-AC converter module and the energy storage system according to the determination of step 430 (440).

5 is a flowchart illustrating a control method of a power control apparatus according to another embodiment.

Referring to FIG. 5, a power control apparatus according to an exemplary embodiment may receive a usage amount of a DC-DC converter that charges or discharges a battery from a DC-DC converter module (510).

The power control unit may receive a usage power estimate of the pending DC-DC converter to charge or discharge the battery from the DC-DC converter module (520).

The power control apparatus may determine the total planned amount of use by adding the used power amount received in step 510 and the estimated power amount received in step 520 in operation 530. [

The power control device may determine 540 whether the total amount of power supplied by the DC-AC converter module is greater than or equal to the total planned amount of the DC-DC converter module.

As a result of the determination in step 540, if the total amount of power supplied to the DC-AC converter module is less than the total amount of the DC-DC converter module to be used, the power control device can determine the number of additional DC- 550). The power control device may further actuate 590 DC-AC converters by the number determined in step 550. [

As a result of the determination in step 540, if the total amount of supplied power of the DC-AC converter module is equal to or greater than the total used amount of the DC-DC converter module, the power control device controls the DC- The number of converters may be determined (560).

The power control apparatus may determine whether the total planned use amount is less than a preset value (for example, 0) (570).

As a result of the determination in step 570, if the total planned use amount is less than 0, the power control apparatus may determine charging of the energy storage system (580). Here, when the total planned use amount is less than 0, it indicates that the discharge electric power amount of the battery is larger than the charged electric power amount.

The power control device may control (590) the operation of some of the DC-AC converter modules in the DC-AC converter module according to the determination of step 560 and step 580 to charge the energy storage system.

For example, a typical DC charging and discharging system in which 10 DC-DC converters correspond one-to-one to 10 DC-AC converters uses 10% of the required capacity of each DC-DC converter, All of the converters are activated and operating power is consumed to power each DC-AC converter.

According to one embodiment, powering the entire DC micro-grid network is possible by operating only one DC-AC converter. Accordingly, since it is not necessary to consume the operating power for operating each of the 10 DC-AC converters, higher power efficiency can be obtained, and the life of the equipment can be increased by reducing the equipment utilization rate.

For example, a DC-AC converter of 500 KW requires about 200 W (standby power at standby) to 2 KW (operating power when operating) for operating power.

In the case of a load with a required capacity of 500 KW, according to one embodiment, only one DC-AC converter of 500 KW class can provide the required power. At this time, the use rate of the DC-AC converter is 1/10 of that of the conventional (all of the 500 KW DC-AC converter is operated at 50 KW), so a maximum of 2 KW X 9 = 18 KW can be saved. Also, according to one embodiment, a reduction in the cooling cost for the heat corresponding to the saved power can also be expected.

According to one embodiment, the capacity of the DC-AC converter can be calculated in accordance with the actual power consumption of the DC mic load lead network, thereby reducing the price by constructing a system. When the amount of power used is less than the capacity of the DC-AC converter designed after the build, the DC-DC converter can be easily expanded or added without additional cost.

The power control apparatus according to an embodiment can monitor the power use of the DC-DC converter and, when exceeded, can schedule the operation of the DC-DC converter in a round-robin manner to operate the network without exceeding the limit of the power capacity. Accordingly, the power control apparatus can easily cope with a case where the amount of the DC-DC converter used later increases to exceed the capacity of the DC-AC converter.

In addition, when the capacity of the DC micro-grid network is not the maximum capacity of the DC-AC converter, the power control apparatus according to the embodiment checks the operation rate of each DC-AC converter and operates less than the current DC- DC-AC converters can be replaced to increase the service life of the equipment by distributing the use of the equipment.

The method according to an embodiment of the present invention can be implemented in the form of a program command which can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and configured for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: DC Micro Grid System
110: Battery
120: DC-DC converter module
130: DC micro-grid network
140: DC-AC Converter Module
150: AC power grid
160: Power control device

Claims (21)

A plurality of batteries;
A DC-DC converter module including a plurality of DC-DC converters for charging or discharging the plurality of batteries;
A DC-to-AC converter module including a plurality of DC-to-AC converters that provide power supplied from an AC power grid to the DC-DC converter module; And
DC converter module and at least one of the DC-DC converter module and the DC-AC converter module based on the monitoring result, wherein the monitoring module monitors at least one of a power consumption of the DC-DC converter module and a power supply amount of the DC- Lt; RTI ID = 0.0 >
Lt; / RTI >
The power consumption of the DC-DC converter module is
And a standby power amount of a DC-DC converter waiting for charging or discharging the plurality of batteries, the standby power amount of the DC-DC converter charging or discharging the plurality of batteries among the plurality of DC-DC converters,
The power control device
DC converter module is determined based on a result of a comparison between a total planned amount of use of the DC-DC converter module and a total supplied power amount of the DC-AC converter module by summing the used power amount and the standby power amount, AC converter to be operated further or stop the operation of the DC-AC converter module, and controls the operation of the plurality of DC-AC converters included in the DC-AC converter module according to the determined number of the DC-AC converters ,
The standby DC-DC converter
And is activated as the charge of the energy storage system is determined based on the total planned amount of use. The method according to claim 1,
A DC micro-grid network connected to the DC-DC converter module
The DC microgrid system further comprising: The method according to claim 1,
The power control device
AC converter module to control the operation of the DC-AC converter module such that a current of a required amount is supplied to the DC-DC converter module or a DC micro-grid network connected to the DC-DC converter module. The method of claim 3,
The power control device
DC converter module and at least one of the DC-DC converter module and the DC-AC converter module based on the monitoring result, wherein the monitoring module monitors at least one of a power consumption of the DC-DC converter module and a power supply amount of the DC- A DC network power controller for controlling the DC power network; And
An energy storage system (ESS) for storing a current discharged by the DC-DC converter module;
The DC microgrid system. 5. The method of claim 4,
The DC network power controller
DC converter module monitors the power usage used by the DC-DC converter module when the plurality of batteries or the load is supplied with electric power from the DC-DC converter module. 6. The method of claim 5,
The DC network power controller
And controls the operation of the DC-AC converter module to supply power required by the DC-DC converter module based on the monitoring result. delete delete 5. The method of claim 4,
The DC network power controller
AC converter module to determine the number of DC-AC converters to be further activated or to be stopped and the presence or absence of charging or discharging of the energy storage system based on the result of comparison between the total planned use amount and the total supplied power amount, And a DC microgrid system for controlling the energy storage system. 5. The method of claim 4,
The DC network power controller
Reducing the number of the DC-AC converters to be operated and supplying the power stored in the energy storage system to the DC-DC converter module or the DC micro-grid network when the power capacity stored in the energy storage system is equal to or greater than a preset reference , DC microgrid system. 5. The method of claim 4,
The energy storage system
Wherein when the instantaneous high power is used in the DC-DC converter module, the power stored in the energy storage system is charged or discharged to stabilize the DC micro-grid network. 1. A power control apparatus including an energy storage system,
The battery management system according to any one of claims 1 to 3, further comprising: a DC-DC converter module including a plurality of DC-DC converters connected to a plurality of batteries, An amount of standby power of a standby DC-DC converter for charging or discharging the DC-DC converter;
The total amount of use of the DC-DC converter module is determined by summing up the amount of used power and the amount of standby power, and based on a result of comparison between the total planned amount of use of the DC-DC converter module and the total amount of supplied power of the DC- A processor for determining the number of DC-AC converters to be further activated or deactivated and for determining whether the energy storage system is charged or discharged; And
And a transmission unit for transmitting a signal for controlling the DC-AC converter module and the energy storage system according to the determination.
Lt; / RTI >
The processor
Controls the operation of the plurality of DC-AC converters included in the DC-AC converter module by the determined number of the DC-AC converters,
The standby DC-DC converter
And is activated as the charging of the energy storage system is determined based on the total planned use amount. 13. The method of claim 12,
The processor
And determines the number of DC-AC converters to be further activated when the total usage amount is larger than the total supply power amount as a result of the comparison. 13. The method of claim 12,
The processor
And determines the number of DC-AC converters to stop the operation when the total usage amount is equal to or less than the total supply electric amount as a result of the comparison. 13. The method of claim 12,
The processor
Determining whether to charge the energy storage system when the total usage amount is smaller than a predetermined value and activating a standby DC-DC converter to charge or discharge the plurality of batteries when the energy storage system is charged; Power control device. The power consumption of the DC-DC converter module received from a DC-DC converter module including a plurality of DC-DC converters, wherein the power consumption of the DC-DC converter module is determined based on the power consumption of the plurality of batteries Wherein the charging and discharging of the plurality of batteries includes charging of the DC-DC converter for charging or discharging, and standby power of the DC-DC converter waiting for charging or discharging the plurality of batteries, Determining a required total amount of use of the DC-DC converter module
AC converter module including a DC-DC converter module or a plurality of DC-AC converters that supply power to a DC micro-grid network connected to the DC-DC converter module and a total power supply amount of the DC- Comparing the total planned use amount;
Determining the number of DC-AC converters to be further activated or to be stopped, and the presence or absence of charging or discharging of the energy storage system based on the comparison result; And
Controlling the operation of the plurality of DC-AC converters included in the DC-AC converter module and the operation of the energy storage system by the determined number of DC-AC converters
Lt; / RTI >
The standby DC-DC converter
Wherein the energy storage system is activated when charging of the energy storage system is determined based on the total planned use amount. delete 17. The method of claim 16,
The step of determining the number of DC-AC converters
Determining a number of DC-AC converters to be further operated according to a unit capacity of the DC-AC converter when the total planned amount of use is greater than the total supplied power amount as a result of the comparison;
The power control apparatus comprising: 17. The method of claim 16,
The step of determining the number of DC-AC converters
Determining a number of DC-AC converters to be stopped according to a unit capacity of the plurality of DC-AC converters when the total planned amount of use is smaller than or equal to the total supplied power amount as a result of the comparison;
The power control apparatus comprising: 17. The method of claim 16,
The step of determining whether the energy storage system is charged or discharged includes:
Determining the charge of the energy storage system if the total planned use amount is less than a predetermined value,
Further comprising the steps of: 21. The method of claim 20,
Operating the standby DC-DC converter to charge or discharge the plurality of batteries after charging the energy storage system
Further comprising the steps of:
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KR20230165978A (en) * 2022-05-27 2023-12-06 유림티에스 주식회사 Battery charge/discharge device including energy storage system and its charging method.

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