KR20090130532A - Restoration-electric power storage apparatus of electric railway with function of balancing multi storage module current - Google Patents

Abstract

PURPOSE: A regenerative power storage unit of an electric line having the current balancing control function of a multiple store module is provided to be compatibly applied to all storage devices regardless of the maker and property of the storage devices, thereby facilitating maintenance and remarkably reducing management expenses. CONSTITUTION: A regenerative power storage module part(100) is configured by the multiple combination of regenerative power storage modules(100a~100n). After storing electricity created in the braking of an electro locomotive, the regenerative power storage modules supply the electricity to wiring. According to the capacity property of the storage unit of each regenerative power storage module, a current balancing controller(200) controls the charge and discharge current of each regenerative power storage module. The current balancing controller outputs a control signal to the controller of each regenerative power storage module. A filter unit is electrically connected to the wiring to remove high frequency component. The storage unit(50) is comprised of a double-layer capacitor storing electric energy.

Description

RESTORATION-ELECTRIC POWER STORAGE APPARATUS OF ELECTRIC RAILWAY WITH FUNCTION OF BALANCING MULTI STORAGE MODULE CURRENT}

The present invention has a current balancing control function of a multi-storage module that allows the use of capacitors of different characteristics as a storage device at the same time regardless of the manufacturer and capacity through the current balancing control in the regenerative power storage system of the conventional electric line. The present invention relates to a regenerative power storage device for an electric line.

Recently, in order to save energy, a regenerative braking method, that is, a method of recovering kinetic energy of an electric vehicle back to electric energy when the accelerated electric vehicle decelerates for stopping is adopted. The regenerative braking method not only reduces the power consumption of the entire system, but also has the advantage of preventing noise problems caused by mechanical braking and wear of the brake shoes.

In accordance with this technological change, the applicant of the present invention provides a regenerative power storage system (hereinafter referred to as 'regenerative power storage system of the related art') using an electric double layer capacitor to stably store and supply regenerative power when the electric vehicle is powered. Korean Patent Application No. 10-2007-36733.

1 is a view showing the above-described regenerative power storage system of the prior art.

As shown in FIG. 1. The regenerative power storage system according to the related art includes a charging unit 10, a filter unit 20, a bidirectional DC / DC converter 30, a DC / DC filter 40, a storage unit 50, a control unit 60, and a current. The detector 70 and the voltage detector 80 are configured.

The regenerative power storage system of the related art having the above-described configuration is switched to the charging mode when the electric vehicle is braked to store electric energy generated during braking of the electric vehicle in the storage unit 50, and to the electric power supply mode of the electric vehicle. It is operated to supply the electric energy stored in the storage unit 50 to the household wire (1), so that it is possible to significantly reduce the power consumption in the electric power line.

However, in the regenerative power storage system of the prior art as described above, since a bidirectional DC / DC converter unit and a storage medium determined to have a predetermined set value with a fixed capacity have to be used, DC / DC is required when capacity increase or variation is required. There has been a problem in that the converter unit and the storage medium have to be redesigned. For example, when the DC / DC converter unit and the storage medium apply 750V and 10MJ and the capacity increases to 750V and 15MJ, the regenerative power storage system cannot be used by changing the existing regenerative power storage system and is set to 750V and 15MJ. The storage system had to be redesigned and used.

In the prior art, when a storage medium is to be connected in parallel and used, the capacitors (or supercapacitors) having small capacities (or supercapacitors) having different capacities are charged first. The capacitor having a large capacity remains in the charging mode while operating in the discharge mode, so that the source of the wire power source and the capacitor having the large capacity are used simultaneously. In this case, the charging is completed first and the discharge is performed. Small-capacity capacitors operating in mode have a higher amount of power than a power supply with only a motor load.

Therefore, in the case of the prior art, if a storage medium of another company is used, a difference in capacity and charge / discharge time may occur, which causes problems as described above. Thus, a specific storage medium having the same characteristics as a capacitor of a predesigned storage medium may be used. Since only the use of a storage medium of one company has to be used, maintenance problems may occur, and a monopoly of a storage medium supplier may occur, resulting in a problem of rising maintenance costs.

Accordingly, the present invention is to solve the problems of the prior art as described above, by making it possible to apply and use the storage medium having different characteristics at the same time to facilitate the capacity change of the regenerative power storage device, The objective is to provide a regenerative power storage site on a single track with current balancing control of multiple storage modules that enable the use of storage media from different vendors at the same time.

The regenerative power storage device for an electric power line having a current balancing control function of the multi-storage module of the present invention for achieving the above object is a regenerative power storage module for storing the power generated during braking of the electric vehicle and supplying the electric power to the wire. A regenerative power storage module unit configured to be multi-coupled; And a current balancing controller configured to control the input / output current for each regenerative power storage module to maintain the input / output power at a predetermined value according to the capacity characteristics of each of the storage units of the regenerative power storage module.

The current balancing controller receives the capacity, input / output current, and power of the storage unit of each regenerative power storage module from the capacitor monitoring unit of each regenerative power storage module, and then stores the capacity of the capacitor constituting the storage unit of each regenerative power storage module. Control signals for controlling charge / discharge currents for the storage unit of each regenerative power storage module so that the total input / output power of the regenerative power storage module unit remains the same in proportion to the capacity of each capacitor, regardless of the characteristics and the manufacturer. It is configured to output to the control unit of the regenerative power storage module.

The regenerative power storage module is configured to store and supply regenerative power by controlling a current for charging and discharging according to the current control signal of the current balancing control unit as described above. A filter unit; A storage unit comprising an electric double layer capacitor for storing electrical energy; A bidirectional DC / DC converter electrically connected between the filter unit and the storage unit and controlled by opening and closing the first transistor and the second transistor according to a control signal; A DC / DC filter electrically connected between the bidirectional DC / DC converter and the storage unit to remove high frequency noise; A voltage detector electrically connected to the filter unit to detect a voltage of the wire; And a controller configured to determine the voltage of the wire detected by the voltage detector and output an open / close control signal to each of the first transistor and the second transistor of the bidirectional DC / DC converter.

In addition, the regenerative power storage module includes: a current detector for detecting an amount of current flowing into the filter unit and outputting the current amount to the controller; A capacitor monitoring unit for monitoring the capacity, input / output current, and power of the storage unit and outputting the measured power to the controller; And a charging unit electrically connected between the wire and the filter unit to prevent an overcurrent during charging of the capacitor of the filter unit, and a charging unit including a cutoff switch for opening and closing the electrical connection between the charging unit and the wire.

The control unit of each regenerative power storage module having the above-described configuration opens the cutoff switch of the charging unit when an overcurrent is detected from the current detection unit, and turns off the first transistor when the storage unit is fully charged in the charging mode. Outputs a signal to control, and in the power supply mode, outputs a signal for controlling the second transistor to an off state when the voltage input from the capacitor monitoring unit is equal to or less than a reference voltage. In this case, the charge / discharge is controlled, and the on / off control of the charge / discharge is controlled so that a current corresponding to the current control value input from the current balancing controller flows.

In the present invention as described above, the current balancing control method of the current balancing control unit and the control unit for charge and discharge current control may be performed by PWM control.

In the regenerative power storage device of an electric line having the current balancing function of the multiple storage module of the present invention having the above-described configuration, the regenerative power of each regenerative power is maintained by the current balancing control unit so that the input / output power of the entire regenerative power module unit can be maintained the same. By controlling the input and output current to the storage unit of the storage module, the regenerative power storage module can be used in various combinations according to the capacity regardless of the manufacturer, characteristics, capacity differences of the storage device.

The regenerative power storage device of an electric line having the current balancing function of the multi-storage module of the present invention having the configuration features as described above can be easily added to the regenerative power storage device by allowing the regenerative power storage module to be easily added. It provides an effect that can easily change the capacity of the storage device without a change.

In addition, regardless of the manufacturer, characteristics, etc. of the storage device is applied to all the storage devices are compatible to facilitate the maintenance, as well as to provide an effect that can significantly reduce the cost.

Hereinafter, with reference to the accompanying drawings showing an embodiment of the present invention in more detail, the present invention with reference to the accompanying drawings according to an embodiment of the present invention performs the same function as the prior art of Figure 1 The configuration to use the same reference numerals.

2 is a block diagram of a regenerative power storage device (hereinafter referred to as "regenerative power storage device A") of an electric power line having a current balancing function of a multiple storage module according to an embodiment of the present invention.

As shown in Figure 2, the regenerative power storage device (A) according to an embodiment of the present invention, the regenerative power storage module (100a ~ 100n) having a separate storage unit 50 is connected to the regenerative power storage in parallel A module unit 100; After measuring the characteristic values such as capacity, power, temperature, voltage, etc. of each storage unit of the regenerative power storage module unit 100, the characteristics of the storage unit 50 of each regenerative power storage module 100a to 100n are thereby measured. The current balancing controller 200 outputs a PWM control signal for controlling the input / output current of each storage unit 50 to the control unit 60 of the regenerative power storage modules 100a to 100n after calculating the appropriate input / output current by determining the appropriate input / output current. It is configured to include, according to the capacity characteristics of each regenerative power storage module (100a ~ 100b) that the current balancing control unit 200 makes up the regenerative power storage module unit 100 of each of the regenerative power storage module (100a ~ 100b) By controlling the charging and discharging current, it is possible to store and supply the regenerative power generated by the electric vehicle in the electric line by using capacitors of different characteristics and different manufacturers at the same time.

First, the configuration of each of the above-described regenerative power storage modules 100a to 100n will be described in more detail.

Each of the regenerative power storage modules 100a to 100n for storing and supplying the regenerative power as described above includes a charging unit 10, a filter unit 20, a bidirectional DC / DC converter 30, and a DC / DC filter 40. And a storage unit 50, a control unit 60, a current detector 70, and a voltage detector 80.

The charging unit 10 is connected to the charging switch 13 for the on / off control of the charge and the resistor 15 for overcurrent protection connected in parallel with the charging switch, the parallel with the charging switch 13 and the resistor 15 In addition to the impedance 11 and the high-speed circuit breaker 5 is composed of a disconnect switch 12 for cutting off the power inside the regenerative power storage module (100a ~ 100n).

Since the charging unit 10 having the above-described configuration has a high capacity when the capacitor provided in the filter unit 20 has a large capacity, the charging unit 10 may be short-circuited until the amount of current decreases and the amount of current decreases. It acts as a protection circuit to protect the peripheral system by this overcurrent.

When the charging unit is described in more detail, when the charging switch 13 is turned off, the overcurrent is prevented from flowing by the resistor 15 of the charging unit 10. After the capacitor 22 is sufficiently charged, the charging switch 13 is turned on.

Impedance 11 of the charging unit is for impedance matching of the circuit and can be selected as necessary.

Next, the filter unit 20 inputs high frequency noise generated by a transistor or a FET in a DC-DC converter, which is a device that oscillates at a high frequency (several kHz to several hundred kHZ) to step up and step down. And prevents exiting through the output power line. In FIG. 2, the filter unit 20 is composed of a capacitor 22 connected in parallel with the inductor 21 connected in series, but the filter unit 20 is to remove high frequency noise and may be replaced with another equivalent circuit.

Next, the bidirectional DC / DC converter 30 includes a first transistor 31 and a second transistor 32 that are controlled by a pulse width modulation (PWM) control signal output from the controller 60. According to the control signal of 60, the first transistor 31 and the second transistor 32 are switched, and the DC voltage is converted into a specific DC voltage in both directions and then output. At this time, when the second transistor is turned off by the control signal of the controller 60 and the first transistor 31 is switched to the on state, the second transistor is operated as a buck converter and the first transistor is turned off. When the second transistor 32 is switched on, it can be set to operate as a boost converter, in which case the first transistor and the second transistor are rotated 180 degrees to control the bidirectional power flow. It is desirable to control the phase difference. In the case where the DC / DC converter 30 has the above-described configuration, the main switching role may be the second transistor. However, the present invention is not limited to the above-described configuration, and the DC / DC converter 30 performs the function of the DC / DC converter 30 of the present invention. Various circuit configurations are possible.

Next, as described in the filter unit 20, the DC / DC filter 40 is to prevent high frequency noise from flowing into surrounding devices to cause various problems. In this embodiment, the inductor 41 is used. ), But it can be replaced by several circuits having the same function.

Next, the storage unit 50 is configured by connecting a plurality of electric double layer capacitors (EDLC) 53 in parallel to store the regenerative power transmitted through the bidirectional DC / DC converter 30. At this time, the storage time is determined according to the capacity of the capacitor. In addition, a switch 51 and a resistor 52 are further provided to artificially consume power stored in the capacitor.

Next, the description of each detection unit, the current detection unit 70 measures the current flowing into the filter unit 20 and outputs it to the control unit 60 to be described later, the voltage detection unit 80 is the filter unit 20 The voltage across the capacitor 22, that is, the voltage of the temporary wire 1, is detected and output to the controller 60. In addition, the capacitor monitoring unit 90 measures the voltage, current, temperature, and charge amount of the electric double layer capacitor (EDLC) 53 of the storage unit 50 and outputs the same to the controller 60 and the current balancing controller 200.

Next, the control unit 60 receives a control signal for the input and output current to the storage unit 50 for each regenerative power storage module (100a ~ 100n) from the current balancing control unit 200, at the same time the voltage detector 80 When the line 1 voltage is greater than the regenerative power storage reference voltage when the line voltage is input from the first line, the first transistor (for the set time to flow the current applied from the current balancing controller 200 to switch to the charging mode). 31) outputs a control signal for switching the state (On). The bidirectional DC / DC converter then acts as a buck converter.

In addition, when the line voltage falls below the regenerative power supply reference voltage, the controller 60 turns off the first transistor for a time set to flow the current applied from the current balancing controller 200, and the second transistor is turned off. Outputs a signal that controls the transistor on. At this time, the bidirectional DC / DC converter operates as a boost converter.

By the operation of the control unit 60 described above, the charge / discharge current is controlled so that the regenerative power storage modules 100a to 100n having the storage units 50 having different characteristics have the same value.

In the present embodiment, the control unit outputs a control signal to the first transistor 31 and the second transistor 32 by pulse width modulation (PWM). Since PWM control is a well-known method, detailed description is abbreviate | omitted.

On the other hand, when the capacitor monitoring unit 90 outputs that the storage unit 50 is in a buffered state, the storage measured by the capacitor monitoring unit 90 is not switched to the charging mode even when the wire voltage becomes higher than the regenerative power storage reference voltage. If the voltage of the unit 50 is less than the regenerative power supply reference voltage, the controller does not switch to the power supply mode. In this case, the controller 60 balances the current so that the output of the entire regenerative power storage module unit 100 always has a constant value. The control signal according to the charge / discharge current control of the controller 200 is first applied to control the charge / discharge current.

Referring to the specific setting example of the control unit 60, the reference voltage provided to the vehicle in the domestic urban railway, subway and light rail is most often 1500V or 750V, so the regenerative power storage reference voltage for storing the regenerative power May be set larger than the applied voltage, and the regenerative power supply reference voltage for supplying the regenerative power back to the wire may be set smaller than the applied voltage. That is, the applied voltage 1500V, the regenerative power storage reference voltage may be set to 1800V greater than the applied voltage, and the regenerative power supply reference voltage is set to 1000V smaller than the applied voltage.

The control unit 60 performing the functions as described above may be implemented as a microprocessor or a general computer system.

Next, the current balancing control unit 200 will be described.

As shown in FIG. 2, the current balancing control unit 200 includes a capacitor (or supercapacitor) provided in each storage unit 50 from the capacitor monitoring unit 90 of each regenerative power storage module 100a to 100n. After receiving characteristic values such as voltage, current, temperature, and capacity of each capacitor, the respective capacitor characteristics are detected, and the output power of the entire regenerative power storage module unit 100 is proportional to each capacitor capacity so as to have a constant value. It is configured to output a current balancing control signal for controlling the charge and discharge current of each regenerative power storage module (100a ~ 100n) to the control unit 60 of each regenerative power storage module (100a ~ 100b).

In this case, the above-described current balancing control signal may be applied to a method such that the charge / discharge may be performed in proportion to the capacity by calculating the charge / discharge current of the capacitors having different capacities according to Equation 1 below. have. And the current balancing method for the control unit 60 of each regenerative power storage module (100a ~ 100b) in the current balancing control unit 200 and also the control unit 60 to adjust the charge and discharge time of the bidirectional DC / DC converter (30) PWM control method may be applied.

Next, the operation of the regenerative power storage device A of FIG. 2 having the above-described configuration will be described.

Conventional consisting of a regenerative power storage device (A) and a single regenerative power storage module consisting of the regenerative power storage module (100a ~ 100b) of the present invention having a storage unit 50 is coupled capacitors having different types The difference from the regenerative power storage system of the technology is that when the regenerative power storage device A of the present invention gives a current reference, a capacitor (or super) that forms the storage unit 50 of each of the two types of regenerative power storage modules. The difference in the charging time resulting from the difference between the capacitor's capacity and the internal resistance is controlled by the current balancing control.

The reason for performing the current balancing control is that if the current balancing control is not performed, the capacitor having the smaller capacity is charged first and the capacitor having the larger capacity remains in the charging mode while operating in the discharge mode. When the load side and the capacitor having a large capacity are used at the same time, the small capacity capacitor which is operated in the discharge mode after the charging is completed first has to bear a larger amount of power than the power supply when the motor load is the only one. This is because the phenomenon occurs.

That is, in order to avoid such a phenomenon, the current balancing controller 200 of FIG. 2 uses the current reference values inputted and outputted according to the characteristics of the capacitors constituting the storage unit 50 of each regenerative power storage module 100a to 100b. After classification, the current balancing control signal calculated for each regenerative power storage module is transmitted to the controller 60 of the regenerative power storage module so that the input / output of the current having the corresponding reference value is performed, and the controller 60 controls the current balancing control unit. Charging of each regenerative power storage module 100a to 100n having different charge and discharge characteristics by controlling the switching time for charging and discharging of the bidirectional DC / DC converter 30 according to the current input / output reference value output from 200. Control to match the discharge time is performed.

By the current balancing control, the regenerative power storage device A of FIG. 2 has regenerative power storage modules 100a to 100b having capacitors having different characteristics when a change in capacity of the entire regenerative power storage device A is required. ), But also to obtain a stable output power.

Experimental Example

Experimental examples of the current and voltage output characteristics during charging and discharging in the regenerative power storage device A of the present invention having the operating characteristics as described above are shown in FIGS. 3 to 7, and each experimental example will be described below. .

3 shows an experimental apparatus for performance experiments of the present invention.

The experimental apparatus of FIG. 3 includes two first and first capacitors having the capacitors sc1 and sc2 of different manufacturers (company A and company B) each having two types of capacitors having different characteristics such as capacitance and internal resistance. Apparatus for the characteristic experiment of the regenerative power storage device (A) of the present invention consisting of two regenerative power storage modules (100a, 100b), each of which is applied to the capacitor (sc1, sc2) having different charge and discharge characteristics, capacity and internal resistance Two different types of first and second regenerative power storage module (100a, 100b), the current balancing control unit for performing the current balancing control for the first and second regenerative power storage module (100a, 100b) and And an induction motor controller 300 and an induction motor 400, and the wire voltage is set to 750V.

In the experiment with the experimental apparatus of FIG. 3, the regenerative power storage module 100a to which the capacitor A sc1 of the company A was applied was used in series of 12 modules. The capacity Csc1 of the entire storage unit was 13.75F. The maximum charging voltage at 583.2V, the internal resistance was used as the condition of 103.2mΩ, and the other regenerative power storage module 100b using the capacitor B (sc2) is the storage capacity (Csc2) 9F, the maximum charging voltage 450V, internal The resistance was set at 170mΩ and the simulation was conducted with the charging current at 200A.

[Charge Mode 1]

In the experimental apparatus having the configuration of FIG. 3, the value of the charging current by the constant current control is calculated by Equation 1 below.

Here, Isc1ref and Isc2ref refer to respective reference currents of the first and second regenerative power storage modules 100a and 100b, and Csc1 and Csc2 represent the capacity of each of the first and second regenerative power storage modules 100a and 100b. Indicates.

As a result of the calculation, the reference current Isc1ref of the regenerative rack storage module 100a was 120.88A, and the reference current Isc2ref of the regenerative rack storage module b was 79.12A.

4 illustrates waveforms of charging currents and voltages of the respective regenerative power storage modules 100a and 100b in the case of the charging mode 1. Referring to FIG. 4, two regenerative power storages are performed by the current balancing control of the present invention. It can be seen that the module classifies a current suitable for a capacitor constituting each storage unit to perform constant current charging, and each charging voltage is charged the same regardless of the capacity.

 In FIG. 4, Isc1ref and Isc2ref represent charging reference currents of the first and second regenerative power storage modules 100a and 100b, and Isc1 and Isc2 represent charging currents of the first and second regenerative power storage modules 100a and 100b, respectively. Vsc1ref and Vsc2ref represent charging reference voltages of the first and second regenerative power storage modules 100a and 100b, and Vsc1ref and Vsc2ref represent charging voltages of each of the first and second regenerative power storage modules 100a and 100b. Indicates.

Next, the experiment for confirming the performance of the regenerative power storage device of the present invention in the sudden change of load through the resistance load and the motor load in the regenerative power storage device (A) having a multi-regenerative power storage module in the experimental apparatus of FIG. Was done.

(A) Resistance load

5 is a graph showing a voltage and current waveform after connecting a load resistor instead of the induction motor control unit 300 and the induction motor 400 in the configuration of FIG. 3 to test the resistance load.

As can be seen in the graph of FIG. 5, the voltage of the DC terminal to which the regenerative power storage modules 100a and 100b are connected can maintain a constant 750V voltage even when the environment of the wire is changed. In addition, the current supplied to the wire during charging and discharging of each of the regenerative power storage modules 100a and 100b by current balancing control is supplied differently according to the difference in capacity of the modules of the two types of capacitors sc1 and sc2. can confirm.

(B) Motor resistance

6 and 7 are graphs showing voltage current output characteristics of the induction motor controller 300 and the induction motor 400 (hereinafter referred to as the motor load) in the experimental apparatus of FIG. 3.

In order to obtain the results of FIGS. 6 and 7, the overhead environment was used as a model DC750V as a light rail system.

As a test condition, as in the case of using a single regenerative power storage module, the retrograde was maintained for 4 seconds, the other line was maintained for 6 seconds, and the braking was performed for 10 seconds to control the power consumption and the regenerative power.

As a result, FIG. 6 shows the determined value when the regenerative power storage modules 100a and 100b are not connected in parallel, and FIG. 7 shows the regenerative power storage modules 100a and 100b in parallel. This is a graph showing the result of using the regenerative power storage device connected with.

When using the regenerative power storage device connected to the regenerative power storage module (100a, 100b) in parallel with respect to the change in load conditions, it can be seen that the voltage of the household wire is kept constant as shown in FIG. It was confirmed that the degree of power supply is different due to the difference in capacity of each of the supercapacitors constituting the regenerative power storage modules 100a and 100b. Through this result, two supercapacitors having different capacities are maintained at the same level by balancing control. It can be seen that charging and discharging are being performed.

1 is a block diagram of a conventional regenerative power regeneration device;

2 is a block diagram of a regenerative power storage device of an electric power line having a current balancing function of a multiple storage module according to an embodiment of the present invention;

3 is a block diagram of an experimental apparatus for performance testing of the present invention;

4 is a graph showing waveforms of charging currents and voltages of the respective regenerative power storage modules 100a and 100b in the case of charging mode 1;

5 is a graph showing a voltage and current waveform after connecting a load resistor instead of the induction motor control unit 300 and the induction motor 400 in the configuration of FIG.

6 and 7 are graphs showing voltage current output characteristics of the induction motor controller 300 and the induction motor 400 (hereinafter referred to as the motor load) in the experimental apparatus of FIG. 3.

Description of the main symbols in the drawings

10: charging part 20: filter part

30: bidirectional DC / DC converter 50: storage

60: control unit 70: current detection unit

80: voltage detection unit 90: capacitor monitoring unit

100: regenerative power storage module unit

A: Regenerative Power Storage

100a ~ 100n: regenerative power storage module

200: current balancing control unit

300: induction motor control unit 400: induction motor

Claims (5)

A regenerative power storage module unit configured to multiplely configure a regenerative power storage module for storing power generated when braking the electric vehicle and then supplying it to the wire; And a current balancing control unit configured to control charge and discharge current of each regenerative power storage module according to the capacity characteristics of the storage unit of each regenerative power storage module. Regenerative power storage device for the power line. The method according to claim 1, wherein the regenerative power storage module unit, Regenerative power storage device characterized in that the regenerative power storage module is connected in parallel. The method of claim 1, wherein the current balancing control unit, And a control signal for controlling charging and discharging current for the storage unit of each regenerative power storage module in proportion to the capacity of the storage unit of each regenerative power storage module. Regenerative power storage device for electric line with current balancing control function of multiple storage modules. The method of claim 3, wherein the control unit, After the current control signal of the current balancing control unit receives the charge and discharge of the regenerative power storage module to perform the charging and discharging switching control of the regenerative power storage module so that the current flows according to the current control signal. Regenerative power storage device for electric line with current balancing control function of module. The method according to any one of claims 1 to 4, The regenerative power storage module, A filter unit electrically connected to the wire to remove high frequency components; A storage unit comprising an electric double layer capacitor for storing electrical energy; A bidirectional DC / DC converter electrically connected between the filter unit and the storage unit and controlled by opening and closing the first transistor and the second transistor according to a control signal; A DC / DC filter electrically connected between the bidirectional DC / DC converter and the storage unit to remove high frequency noise; A voltage detector electrically connected to the filter unit to detect a voltage of the wire; A current detector for detecting an amount of current flowing into the filter unit and outputting the current amount to a control unit; A capacitor monitoring unit for monitoring the capacity, input / output current, and power of the storage unit and outputting the measured power to the controller; The first and second transistors of the bidirectional DC / DC converter are determined according to the voltage of the wire detected by the voltage detector and the capacitor monitoring unit, and the charging voltage of the storage unit. A control unit for outputting an open / close control signal to each of the regenerative power storage device of the electric line with a current balancing control function of the multiple storage module, characterized in that consisting of.

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