KR101695526B1 - Voltage stabilizing device and voltage stabilizing method for battery discharging circuit, and battery discharging system including the voltage stabilizing device - Google Patents

Abstract

A voltage comparator for comparing the difference between the voltage of the DC microgrid and the discharge voltage of the battery, at least one additional DC-DC converter connected between the DC microgrid and the battery, at least one additional DC- DC converter according to the control signal, and at least one additional DC-DC converter is connected or bypassed between the DC-DC converter and the AC-DC converter included in the DC micro-grid according to the control signal bypassing the voltage stabilization device of the battery discharge circuit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage stabilizing device and method for a battery discharge circuit, and a battery discharge system including a voltage stabilizing device. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

A battery discharge system including a voltage stabilization device and method of a battery discharge circuit, and a voltage stabilization device is disclosed.

In the DC (Direct Current) micro-grid circuit, a number of micro-grid networks are used rather than one micro-grid network. At this time, a change in DC voltage occurring in a plurality of micro grid networks may cause malfunction of the device.

That is, although a certain voltage should be applied to the micro grid network, in the case of a DC micro grid system using a plurality of micro grid networks, the electric power demand also increases as the discharge amount of the battery increases. Therefore, in the case of a DC micro-grid system, voltage may become unstable or an overshoot phenomenon may occur.

Techniques that constitute the background of the present invention are disclosed in the following two patent documents.

(1) Korean Patent Laid-Open No. 2011-0140923 (2011-12-23)

(2) Korean Laid-Open Patent Publication No. 2013-0011073 (2013-01-31)

According to one embodiment, on the basis of the difference between the discharge voltage of the battery and the load voltage, the discharge voltage of the battery is boosted through the additional DC-DC converter or bypassed directly through the switch to minimize energy loss, Discharge time and efficiency can be maximized.

According to one embodiment, a voltage stabilization device of a battery discharge circuit includes: a voltage comparison unit comparing a difference between a load voltage and a discharge voltage of the battery; At least one additional DC-DC converter (Direct Current-Direct Current Converter) connected between the DC microgrid and the battery; A control unit for generating, based on the difference between the voltages, a control signal for controlling connection of the at least one additional DC-DC converter; And connecting or bypassing the at least one additional DC-DC converter according to the control signal between an AC-DC converter (Alternating Current-Direct Current Converter) included in the DC micro-grid and a DC-DC converter And at least one switch.

The load voltage may be an input voltage of the AC-DC converter.

The control unit may generate a control signal for bypassing the at least one additional DC-DC converter when the difference between the voltages is equal to or greater than a predetermined value.

The control unit may generate a control signal for connecting the at least one additional DC-DC converter when the difference between the voltages is less than a predetermined value.

Wherein the DC microgrid includes an AC-DC converter and a DC-DC converter, the output of the DC-DC converter being applied as an input to the additional DC-DC converter, DC converter.

The number of the at least one additional DC-DC converter may be determined based on the discharge voltage efficiency of the battery.

According to one embodiment, a battery discharge system includes a DC microgrid comprising an AC-DC converter and a DC-DC converter; Voltage stabilization devices for loads; And a battery for outputting a discharge voltage to the load through the voltage stabilizer, wherein the voltage stabilizer includes: a voltage comparator for comparing a difference between a voltage of the load and a discharge voltage of the battery; At least one additional DC-DC converter connected to the battery; A control unit for generating, based on the difference between the voltages, a control signal for controlling connection of the at least one additional DC-DC converter; And at least one switch for connecting or bypassing the at least one additional DC-DC converter in accordance with the control signal between the AC-DC converter and the DC-DC converter included in the DC micro-grid.

The voltage comparator may compare the difference between the voltage of the load and the discharge voltage of the battery.

The control unit may generate a control signal for bypassing the at least one additional DC-DC converter when the difference between the voltages is equal to or greater than a predetermined value.

The control unit may generate a control signal for connecting the at least one additional DC-DC converter when the difference between the voltages is less than a predetermined value.

In the DC microgrid, the output of the DC-DC converter is applied to the input of the additional DC-DC converter, and the output of the additional DC-DC converter is applied to the input of the AC-DC converter.

The number of the at least one additional DC-DC converter may be determined based on the discharge voltage efficiency of the battery.

According to one embodiment, a battery discharge system includes a DC microgrid comprising an AC-DC converter and a first DC-DC converter; A second DC-DC converter connected between the AC-DC converter and the first DC-DC converter; A first voltage comparator comparing a first difference between a discharge voltage of the battery and a voltage of the load; A first control unit for generating a first control signal for controlling the connection of the second DC-DC converter based on a first difference between the voltages; A first switch for connecting or bypassing the second DC-DC converter to the first DC-DC converter in accordance with the first control signal; A third DC-DC converter connected between the second DC-DC converter and the AC-DC converter; A second voltage comparator comparing a second difference between an output voltage of the second DC-DC converter and a discharge voltage of the battery; A second control unit for generating a second control signal for controlling the connection of the third DC-DC converter based on a second difference between the voltages; And a second switch for connecting or bypassing the third DC-DC converter between the second DC-DC converter and the AC-DC converter in accordance with the second control signal, DC converter, the DC-DC converter, the second DC-DC converter, and the third DC-DC converter.

The first control unit generates a control signal for connecting the second DC-DC converter when the first difference between the voltages is equal to or greater than a predetermined value, and when the first difference between the voltages is less than a predetermined value , It may generate a control signal to bypass the second DC-DC converter.

The second controller generates a control signal for connecting the third DC-DC converter when the second difference between the voltages is equal to or greater than a preset value, and when the second difference between the voltages is less than a predetermined value , It may generate a control signal that bypasses the third DC-DC converter.

According to one embodiment, a method for stabilizing the voltage of a battery discharge circuit includes comparing a difference between a load voltage and a discharge voltage of the battery; Generating a control signal to control connection of at least one additional DC-DC converter connected between the DC microgrid and the battery based on the difference between the voltages; And connecting or bypassing the at least one additional DC-DC converter in accordance with the control signal between an AC-DC converter and a DC-DC converter included in the DC micro-grid.

The load voltage may be an input voltage of the AC-DC converter.

Wherein the generating of the control signal comprises generating a control signal to connect the at least one additional DC-DC converter if the difference between the voltages is greater than or equal to a preset value, And if so, generating a control signal to bypass the at least one additional DC-DC converter.

The number of the at least one additional DC-DC converter may be determined based on the discharge voltage efficiency of the battery.

According to one aspect of the present invention, it is possible to minimize the energy loss by boosting the discharge voltage of the battery through the additional DC-DC converter, or bypassing it directly through the switch, based on the difference between the discharge voltage of the battery and the load voltage, The discharge time and efficiency of the battery can be improved.

According to one aspect of the present invention, the signal quality can be improved by attenuating the voltage difference by connecting multiple additional DC-DC converters.

1 is a view for explaining a battery discharge system including a voltage stabilizing device and a voltage stabilizing device of a battery discharge circuit according to an embodiment.
2 is a block diagram of a battery discharge system including a voltage stabilization device and a voltage stabilization device of a battery discharge circuit according to another embodiment.
3 is a block diagram of a battery discharge system including a voltage stabilizing device and a voltage stabilizing device of a battery discharge circuit according to another embodiment.
4 is a flowchart showing a voltage stabilization method of a battery discharge circuit according to an embodiment.
5 is a flowchart showing a voltage stabilization method of a battery discharge circuit 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 view for explaining a battery discharge system including a voltage stabilizing device and a voltage stabilizing device of a battery discharge circuit according to an embodiment.

1, a battery discharge system 100 according to an embodiment includes a DC micro-grid 110, a voltage stabilization device (hereinafter, referred to as 'voltage stabilization device') 130, and a battery 150 .

DC microgrid 110 includes a three-phase AC power source 111, an AC-DC converter 113, and a DC-DC converter (Direct Current-Direct Current Converter) 115).

The three-phase AC power source 111 may include three different AC power sources. Three different AC power sources may be connected in parallel to each other to apply AC power to the AC-DC converter 113.

The AC-DC converter 113 can convert the AC power to the DC power.

The DC-DC converter 115 may be connected to the AC-DC converter 113 via the voltage stabilizer 130.

The output of the DC-DC converter 115 may be applied to the input of the additional DC-DC converter 139 of the voltage stabilizer 130. The output of the additional DC-DC converter 139 may be applied to a load, that is, to the three-phase AC power supply 111 side.

In one embodiment, the AC-DC converter 113 and the DC-DC converter 115 may be bidirectional converters. Phase AC power source 111 or the input side of the AC-DC converter 113 becomes a load because the energy of the battery 150 is consumed in the three-phase AC power source 111 . The arrows shown in Fig. 1 indicate the direction in which energy is supplied. Since the energy is supplied from the battery 150 in the direction of the load on the input side of the AC-DC converter 113 of the DC micro-grid 110 during the discharge according to the embodiment, The direction in which energy is applied (battery) is expressed as 'input' and the direction in which energy is output (load) is expressed as 'output'.

The voltage stabilizer 130 includes a voltage comparator 131, a controller 133, switches 135 and 137, and an additional DC-DC converter 139.

The voltage comparator 131 compares the difference between the load voltage on the input side of the AC-DC converter 113 of the DC micro-grid 110 and the discharge voltage of the battery 150.

The control unit 133 generates a control signal for controlling the connection of at least one additional DC-DC converter 139 based on the difference between the load voltage and the discharge voltage of the battery 150. [

The control unit 133 may generate a control signal that connects at least one additional DC-DC converter 139 when the difference between the load voltage and the discharge voltage of the battery 150 is equal to or greater than a predetermined value. At this time, the preset value can be appropriately adjusted as needed.

In one embodiment, when the difference between the voltages is large, the at least one additional DC-DC converter 139 may be used to boost the discharge voltage of the battery 150 to provide a voltage required by the load at a fast time.

The control unit 133 generates a control signal for bypassing at least one additional DC-DC converter 139 when the difference between the voltage of the DC micro-grid 110 and the discharge voltage of the battery 150 is smaller than a predetermined value .

In one embodiment, when the difference between the voltages is small, the energy loss can be minimized by directly connecting the discharged DC voltage from the battery 150 to the load side.

The switches 135 and 137 switch at least one additional DC-DC converter 139 between the DC micro-grid 110 and the battery 150 (more specifically, the AC-DC converter 139) according to the control signal of the controller 133 113) and the DC-DC converter 115).

The switches 135 and 137 may be insulated gate bipolar transistors (IGBTs) or MOSFET (MOS field-effect transistors). The switches 135 and 137 may be connected in parallel between the voltages across the at least one additional DC-DC converter 139, respectively.

At least one additional DC-DC converter 139 may be coupled between the DC microgrid 110 and the battery 150.

The number of at least one additional DC-DC converter 139 may be one or more. The number of at least one additional DC-DC converter 139 may be determined based on the discharge voltage efficiency of the battery 150. [ If there are a plurality of additional DC-DC converters 139, the additional DC-DC converters 139 may be connected in series with each other. At least one additional DC-DC converter 139 may be coupled in series with the battery 150.

The battery 150 may be a lithium ion battery. The battery 150 may be a battery cell composed of a plurality of battery modules.

2 is a block diagram of a battery discharge system including a voltage stabilization device and a voltage stabilization device of a battery discharge circuit according to another embodiment.

Referring to FIG. 2, a voltage comparator 231 and a voltage regulator 232 for controlling the switches 233, 234, 236, 237 and two additional DC-DC converters 235, A battery discharge system 200 including a battery charger 230 and a voltage stabilizer 230 is shown.

The battery discharge system 200 according to one embodiment includes a DC micro-grid 210, a voltage stabilization device 230 for a load, and a battery 250.

The DC micro-grid 210 includes a three-phase AC power source 211, an AC-DC converter 213, and a DC-DC converter 215.

Here, the description of each component of the DC microgrid 210 is the same as that of the DC microgrid 110, and therefore, the description of the relevant portion will be referred to.

The voltage stabilizer 230 includes a voltage comparator 231, a controller 232, switches 233, 234. 236 and 237, a first additional DC-DC converter 235 and a second additional DC- (238).

The voltage comparator 231 compares the difference between the discharge voltage of the battery 250 and the output voltage of the first additional DC-DC converter 235 and the input voltage of the AC-DC converter 213 .

The controller 232 controls the difference between the discharge voltage of the battery 250 and the output voltage of the first additional DC-DC converter 235 and the difference between the discharge voltage of the battery 250 and the input voltage of the AC- The first additional DC-DC converter 235 and the second additional DC-DC converter 238, respectively, based on the difference between the first additional DC-DC converter 238 and the second additional DC-DC converter 238. [

For example, when the difference between the discharge voltage of the battery 250 and the output voltage of the first additional DC-DC converter 235 is equal to or greater than a preset value, the controller 232 controls the first additional DC-DC converter 235 of the control signal line.

The discharge voltage of the battery 250 via the DC-DC converter 215 can be boosted through the first additional DC-DC converter 235 by the control signal.

The control unit 232 may bypass the first additional DC-DC converter 235 when the difference between the discharge voltage of the battery 250 and the output voltage of the first additional DC-DC converter 235 is smaller than a preset value A control signal can be generated.

The discharge voltage of the battery 250 via the DC-DC converter 215 is controlled by the control signal directly through the switches 233 and 234 without passing through the first additional DC-DC converter 235, Lt; RTI ID = 0.0 > 238 < / RTI >

When the difference between the discharge voltage of the battery 250 and the input voltage of the AC-DC converter 213 is equal to or greater than a predetermined value, the controller 232 connects the second additional DC-DC converter 238 A control signal can be generated.

The second additional DC-DC converter 238 may be connected in series with the first additional DC-DC converter 235 by a control signal. The discharge voltage of the battery 250 via the first additional DC-DC converter 235 may be boosted again through the second additional DC-DC converter 238. [

The control unit 232 outputs a control signal for bypassing the second additional DC-DC converter 238 when the difference between the discharge voltage of the battery 250 and the input voltage of the AC-DC converter 213 is smaller than a preset value . The discharge voltage of the battery 250 by the control signal can be supplied directly to the load through the switches 236 and 237 without passing through the second additional DC-DC converter 238. [

The switches 233 and 234 switch the first additional DC-DC converter 235 to the DC-DC converter 215 and the AC-DC converter 215 included in the DC micro-grid 210 according to the control signal of the controller 232 213). ≪ / RTI > The switches 233 and 234 may be connected in parallel between the voltages across the two ends of the first additional DC-DC converter 235, respectively.

The switches 236 and 237 connect the second additional DC-DC converter 238 to the first additional DC-DC converter 235 and the AC-DC converter 213 in accordance with the control signal of the controller 232 Or bypassed. The switches 236 and 237 may be connected in parallel between the voltages across the two ends of the second additional DC-DC converter 238, respectively.

The switches 233, 234, 236, 237 may be an IGBT or a MOSFET.

The first additional DC-DC converter 235 is connected between the DC-DC converter 215 of the DC micro-grid 210 and the AC-DC converter 213 to boost the discharge voltage of the battery 250, .

The second additional DC-DC converter 238 is connected between the first additional DC-DC converter 235 and the AC-DC converter 213 to boost the discharge voltage of the battery 250 if necessary.

The battery 250 outputs the discharge voltage to the load through the voltage stabilizer 230. [

For example, let assume that the discharge voltage of the battery 250 is 5V and the required voltage of the load is 20V.

At this time, if the difference between the discharge voltage of the battery 250 and the required voltage of the load is 15 V and the preset value is 5 V, the controller 232 outputs a control signal for connecting the first additional DC-DC converter 235 . The switches 233 and 234 may connect the first additional DC-DC converter 235 to the DC-DC converter 215 in accordance with the control signal. At this time, the discharge voltage of the battery 250 may be boosted to 10V through the first additional DC-DC converter 235. [

The control unit 232 can compare the output voltage 10V of the first additional DC-DC converter 235 with the discharge voltage 5V of the battery 250. [ As a result of the comparison, the control unit 232 may generate a control signal for connecting the second additional DC-DC converter 238. According to the control signal, the switches 236 and 237 can connect the second additional DC-DC converter 238 to the first additional DC-DC converter 235. The discharge voltage of the battery 250 can be boosted to 20V through the second additional DC-DC converter 235. [

For example, assume that the discharge voltage of the battery 250 is 7.5 V and the required voltage of the load is 3.5 V.

At this time, when the difference between the discharge voltage of the battery 250 and the required voltage of the load is 4 V and the predetermined value is 5 V, the control unit 232 outputs a control signal for bypassing the first additional DC-DC converter 235 Can be generated.

The switches 233 and 234 can bypass the first additional DC-DC converter 235 and apply the discharge voltage of the battery 250 to the second additional DC-DC converter 238 side. At this time, the discharge voltage of the battery applied to the first additional DC-DC converter 235 may be partially reduced by the DC-DC converter 215.

The control unit 232 can compare the difference between the output voltage of the first additional DC-DC converter 235 (voltage at a constant partial reduced at 7.5V) and the discharge voltage (7.5V) of the battery 250. [ As a result of the comparison, since the difference between the voltages is smaller than the predetermined value (5 V), the control unit 232 can generate the control signal for bypassing the second additional DC-DC converter 238.

The switches 236 and 237 can bypass the second additional DC-DC converter 238 and regenerate the discharge voltage of the battery 250 through the DC-DC converter 215 according to the control signal.

The number of additional DC-DC converters 235 and 238 may then be determined by the trade-off between the discharge voltage efficiency of the battery 250 and the size (volume), signal quality and cost increase due to circuit increase have.

3 is a block diagram of a battery discharge system including a voltage stabilizing device and a voltage stabilizing device of a battery discharge circuit according to another embodiment.

Referring to FIG. 3, a battery discharge system 300 including a voltage stabilization device for each channel is shown.

The battery discharge system 300 according to one embodiment includes a DC micro-grid 310, a first voltage stabilization device 330, a second voltage stabilization device 350, and a battery 370.

The DC micro-grid 310 includes a three-phase AC power supply 311, an AC-DC converter 313, and a first DC-DC converter 315. Here, the description of each component of the DC microgrid 310 is the same as that of the DC microgrid 110 of FIG. 1, and therefore, a description of the relevant portion will be referred to.

The first voltage stabilization device 330 includes a first voltage comparator 331, a first control unit 333, switches 335 and 337 and a second DC-DC converter 339.

The first voltage comparator 331 compares the first difference between the discharge voltage of the battery 370 and the voltage of the load.

The first control unit 333 generates a first control signal for controlling the connection of the second DC-DC converter 339 based on the first difference between the voltages.

The first control unit 333 generates a control signal for connecting the second DC-DC converter 339 when the first difference between the voltages is equal to or greater than a predetermined value, and when the first difference between the voltages is greater than a preset value If so, a control signal can be generated that bypasses the second DC-DC converter 339.

The first switches 335 and 337 connect the second DC-DC converter 339 to the first DC-DC converter 315 and the AC-DC converter 313 of the DC micro-grid 310 in accordance with the first control signal Or bypass. The first switches 335 and 337 may be connected in parallel between the two terminals of the second DC-DC converter 339, respectively. The first switches 335 and 337 may be IGBTs or MOSFETs.

The second DC-DC converter 339 may be connected between the AC-DC converter 313 and the first DC-DC converter 315 and may be connected in series with the first DC-DC converter 315.

The second voltage stabilization device 350 includes a second voltage comparator 351, a second control unit 353, switches 355 and 357, and a third DC-DC converter 359.

The second voltage comparator 351 compares the second difference between the output voltage of the second DC-DC converter 339 and the discharge voltage of the battery 370.

The second control unit 353 generates a second control signal for controlling the connection of the third DC-DC converter 359 based on the second difference between the voltages.

DC converter 339 and the AC-DC converter 313 when the second difference between the voltages is equal to or greater than a predetermined value, the second control unit 353 controls the third DC- And to generate a control signal to bypass the third DC-DC converter 359 when the second difference between the voltages is less than a preset value.

The second switches 355 and 357 connect or bypass the third DC-DC converter 359 between the second DC-DC converter 339 and the AC-DC converter 313 in accordance with the second control signal.

The second switches 355 and 357 may be connected in parallel between the two terminals of the third DC-DC converter 359, respectively. The second switches 355 and 357 may be IGBTs or MOSFETs.

The third DC-DC converter 359 may be connected in series to the output of the second DC-DC converter 339.

The battery 370 outputs the discharge voltage through at least one of the first DC-DC converter 315, the second DC-DC converter 339 and the third DC-DC converter 359.

4 is a flowchart showing a voltage stabilization method of a battery discharge circuit according to an embodiment.

Referring to FIG. 4, a voltage stabilization apparatus according to an embodiment compares the difference between a load voltage and a discharge voltage of a battery (410).

The voltage stabilizer generates 420 a control signal that controls the connection of at least one additional DC-DC converter coupled between the DC microgrid and the battery, based on the difference between the voltages compared at step 410.

The voltage stabilizer connects or bypasses (430) at least one additional DC-DC converter between the DC micro-grid and the battery, according to the control signal generated in step 420. At this time, the number of at least one additional DC-DC converter connected between the DC microgrid and the battery may be determined based on the discharge voltage efficiency of the battery.

5 is a flowchart showing a voltage stabilization method of a battery discharge circuit according to another embodiment.

Referring to FIG. 5, a voltage stabilization apparatus according to an embodiment compares a difference between a load voltage and a discharge voltage of a battery (510). At this time, the voltage stabilizer can compare the difference between the load voltage at the input (or three-phase AC power) side of the AC-DC converter included in the DC microgrid and the discharge voltage of the battery.

The voltage stabilizer may determine 520 whether the difference between the voltages compared in step 510 is greater than or equal to a preset value.

If it is determined in step 520 that the difference between the compared voltages is greater than or equal to a preset value, the voltage stabilizer may generate a control signal to connect at least one additional DC-DC converter.

The voltage stabilizer may connect at least one additional DC-DC converter according to the control signal generated in step 530 (540).

If it is determined in step 520 that the difference between the compared voltages is less than the preset value, the voltage stabilizer may generate a control signal to bypass at least one additional DC-DC converter (550).

The voltage stabilizer may bypass (560) at least one additional DC-DC converter between the DC microgrid and the battery in accordance with the control signal generated in step 550.

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 constructed 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: Battery discharge system
110: DC microgrid
111: Three phase AC power source
113: Alternating Current-Direct Current Converter (AC-DC)
115: DC-DC Converter (Direct Current-Direct Current Converter)
130: Voltage stabilization device
131:
135:
135, 137: switch
139: Additional DC-DC Converter
150: Battery

Claims (20)

A voltage comparator comparing a difference between a load voltage and a discharge voltage of the battery;
At least one additional DC-DC converter (Direct Current-Direct Current Converter) connected between the DC microgrid and the battery;
A control unit for generating, based on the difference between the voltages, a control signal for controlling connection of the at least one additional DC-DC converter; And
And connecting the at least one additional DC-DC converter in accordance with the control signal between an AC-DC converter (Alternating Current-Direct Current Converter) included in the DC micro-grid and a DC-DC converter included in the DC micro- At least one switch for bypassing
And the voltage stabilization device of the battery discharge circuit.
The method according to claim 1,
The load voltage
And the input voltage of the AC-DC converter.
The method according to claim 1,
Wherein,
And generates a control signal to connect the at least one additional DC-DC converter when the difference between the voltages is equal to or greater than a preset value.
The method according to claim 1,
Wherein,
And generates a control signal to bypass the at least one additional DC-DC converter when the difference between the voltages is less than a preset value.
The method according to claim 1,
The DC microgrid
An AC-DC converter and a DC-DC converter,
The output of the DC-DC converter is applied to the input of the additional DC-DC converter,
And an output of the additional DC-DC converter is applied to an input of the AC-DC converter.
The method according to claim 1,
Wherein the number of the at least one additional DC-
And the discharge voltage of the battery is determined based on the discharge voltage efficiency of the battery.
An AC-DC converter, and a DC-DC converter;
Voltage stabilization devices for loads; And
A voltage regulator for regulating the voltage of the battery,
Lt; / RTI >
The voltage stabilizing device includes:
A voltage comparator comparing a difference between the voltage of the load and the discharge voltage of the battery;
At least one additional DC-DC converter connected between the DC-DC converter and the AC-DC converter and connected to the battery via the DC-DC converter;
A control unit for generating, based on the difference between the voltages, a control signal for controlling connection of the at least one additional DC-DC converter; And
And at least one switch for connecting or bypassing the at least one additional DC-DC converter in accordance with the control signal between the AC-DC converter and the DC-DC converter included in the DC micro-grid.
And a battery.
delete 8. The method of claim 7,
Wherein,
And to generate a control signal connecting the at least one additional DC-DC converter if the difference between the voltages is greater than or equal to a preset value.
8. The method of claim 7,
Wherein,
And to generate a control signal to bypass the at least one additional DC-DC converter if the difference between the voltages is less than a predetermined value.
8. The method of claim 7,
In the DC microgrid
The output of the DC-DC converter is applied to the input of the additional DC-DC converter,
And an output of the additional DC-DC converter is applied to an input of the AC-DC converter.
8. The method of claim 7,
Wherein the number of the at least one additional DC-
Wherein the battery voltage is determined based on a discharge voltage efficiency of the battery.
A DC microgrid comprising an AC-DC converter and a first DC-DC converter;
A second DC-DC converter connected between the AC-DC converter and the first DC-DC converter;
A first voltage comparing unit comparing a first difference between a discharge voltage of the battery and a voltage of the load;
A first control unit for generating a first control signal for controlling the connection of the second DC-DC converter based on a first difference between the voltages;
A first switch for connecting or bypassing the second DC-DC converter to the first DC-DC converter in accordance with the first control signal;
A third DC-DC converter connected between the second DC-DC converter and the AC-DC converter;
A second voltage comparator comparing a second difference between an output voltage of the second DC-DC converter and a discharge voltage of the battery;
A second control unit for generating a second control signal for controlling the connection of the third DC-DC converter based on a second difference between the voltages; And
And a second switch for connecting or bypassing the third DC-DC converter between the second DC-DC converter and the AC-DC converter in accordance with the second control signal.
Lt; / RTI >
The battery includes:
And the discharge voltage is output through at least one of the first DC-DC converter, the second DC-DC converter, and the third DC-DC converter.
14. The method of claim 13,
Wherein the first control unit includes:
Generating a control signal to connect the second DC-DC converter when the first difference between the voltages is equal to or greater than a predetermined value,
And to generate a control signal to bypass the second DC-DC converter when the first difference between the voltages is less than a predetermined value.
14. The method of claim 13,
Wherein the second control unit comprises:
And generates a control signal for connecting the third DC-DC converter when the second difference between the voltages is equal to or greater than a predetermined value,
And to generate a control signal to bypass the third DC-DC converter if the second difference between the voltages is less than a preset value.
Comparing a difference between a load voltage and a discharge voltage of the battery;
Generating a control signal to control connection of at least one additional DC-DC converter connected between the DC microgrid and the battery, based on the difference between the voltages; And
Connecting or bypassing the at least one additional DC-DC converter according to the control signal between an AC-DC converter included in the DC micro-grid and a DC-DC converter included in the DC micro-grid
Wherein the voltage stabilization method comprises:
17. The method of claim 16,
The load voltage
Wherein the input voltage is the input voltage of the AC-DC converter.
17. The method of claim 16,
Wherein generating the control signal comprises:
Generating a control signal to connect the at least one additional DC-DC converter if the difference between the voltages is equal to or greater than a predetermined value,
Generating a control signal to bypass the at least one additional DC-DC converter if the difference between the voltages is less than a predetermined value
Wherein the voltage stabilization method comprises:
17. The method of claim 16,
Wherein the number of the at least one additional DC-
And determining the discharge voltage efficiency of the battery based on the discharge voltage efficiency of the battery.
A computer-readable recording medium having recorded thereon a program for performing the method according to any one of claims 16 to 19.

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