JP2013018464A - Feeding system of electric railroad including electric storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problems: a power converter not only becomes a noise source but also is expensive, though a feeding system of an electric railroad including an electric storage device is often equipped with the power converter for controlling the charge and discharge of the electric storage device; and the electric storage device undergoes overcharge or overdischarge when the power converter is not provided.SOLUTION: A current control circuit comprising a diode and a switch is provided in series with the electric storage device between a feeding wire with positive electric potential and a return wire with negative electric potential in the feeding system. When the electric storage device undergoes the overcharge or the overdischarge, the switch is opened to prevent the overcharge or the overdischarge. Thereby, the problem of the overcharge or overdischarge of the electric storage device, which is an issue of concern and which is caused by fluctuations in the voltage of the feeding wire, is solved while the superiority of a feeding wire direct-connection system of the electric storage device is maintained.

Description

  The present invention relates to a feeding system that supplies DC power to an overhead line of an electric railway, and more particularly to control of a power storage facility in the electric railway.

  Generally, an electric railway substation converts AC power supplied from an electric power company into DC power and supplies it to electric wires. The DC power supplied to the feeder is supplied to the electric vehicle through the pantograph via the aerial overhead line. Or direct-current power is supplied to an electric vehicle from a feeder via a 3rd rail. The electric vehicle converts the supplied DC power into predetermined AC power via a power control device mounted on the electric vehicle, and supplies the AC power to a traveling motor, where the electric energy is converted into traveling energy and travels. To do.

  The amount of energy consumed by the electric vehicle varies depending on the traveling state of the vehicle and the state of the traveling route. Specifically, during acceleration, a large current flows through the electric vehicle in a short time, and as a result, the overhead wire voltage or the third rail voltage, and the feeder voltage drop temporarily. On the other hand, when the traveling electric vehicle decelerates, the regenerative brake is activated, and the traveling motor acts as a generator to send regenerative electric power to other electric vehicles on the track via an overhead line or the like. At this time, if there is an electric vehicle that requires electric power on the track, the electric vehicle consumes regenerative power. However, when there is no electric vehicle that requires electric power on the track, regenerative power is not consumed, and the voltage of the overhead line or the feeder line temporarily rises.

  In order to cope with such a temporary voltage drop and rise, in recent years, a power storage device using a storage battery or a capacitor is connected to the feeder circuit, and the regenerative power surplus in the feeder circuit is absorbed into the power storage device. On the other hand, a technique for effectively using regenerative power energy and stabilizing the voltage of the power feeding circuit by discharging the power storage device when power is insufficient in the power feeding circuit has been put into practical use.

  Patent Document 1 relates to a power supply system for electric railways that does not require a large area, is excellent in rapid charge / discharge characteristics, and can be manufactured at low cost, and a rectifier connected to a transformer and a transformer that receives power from an AC power line. An electric railway substation having an apparatus and a feeder connected to a rectifier has a technique in which a nickel-metal hydride battery is provided as a DC power facility and the nickel-metal hydride battery is directly connected to the feeder.

  In Patent Document 2, as an energy storage device, simply regenerating and regenerating regenerative power from an electric vehicle in a battery results in inferior utilization efficiency and facility efficiency of the device. Controls the charging current from the feeder to the DC power storage device when the feeder voltage is above the charging control set voltage, and from the DC power storage device to the feeder when the feeder voltage is below the discharge control set voltage In order to control the discharge current, the voltage component that does not contribute to charging / discharging of the feeder line is reduced in the voltage of the DC power storage device to obtain a high step-up / step-down ratio that obtains the desired charging / discharging voltage. The stopper switch prevents natural discharge from the DC power storage device to the feeder side through the step-up / down chopper. The filter capacitor and the reactor suppress harmonics flowing from the buck-boost chopper to the feeder line side. The current detector discloses a technique for performing current detection for controlling the charge / discharge current of the step-up / down chopper.

International Publication No. 2009/107715 JP 2001-260719 A

  In power supply for electric railways, there are roughly the following two methods for connecting a power storage device to feeders. The first method is a method shown in the schematic configuration diagram of FIG. 1, in which the power storage device 105 is connected to the feeder 106 via a power converter 109 including a step-up / step-down chopper or the like (for example, Patent Document 2). The second method is a method shown in the schematic configuration diagram of FIG. 2, in which the power storage device 105 is directly connected to the feeder 106 without going through the power conversion device (for example, Patent Document 1).

  The electric vehicle 101 travels by receiving power supplied from the feeder line 106 via the overhead line 102, and when the regenerative brake is activated, the traveling motor 104 serves as a generator to generate the substation via the regenerated power feeder line 106. 1, the power storage device 105 is directly charged via the power conversion device 109 in the case of FIG. 1 and directly in the case of FIG. 2.

 In the first method (FIG. 1), the power converter 109 has a function of freely adjusting its input / output voltage. For example, even when the voltage of the feeder 106 greatly fluctuates and greatly deviates from the voltage of the power storage device 105, the power converter 109 can control the voltage of the power storage device 105 to match the voltage of the feeder 106. That is, the charging current / discharging current of the power storage device 105 can be freely adjusted.

  On the other hand, since a control time delay occurs in the power conversion device 109, it is difficult to accurately follow and control the constantly changing voltage of the feeder 106, and it is difficult to fully demonstrate the performance of the power storage device 105. . Moreover, there is a risk of causing electromagnetic interference in the signal equipment, the vehicle control device, and the like due to harmonic noise generated from the step-up / step-down chopper of the power converter 109. Furthermore, the first method (FIG. 1) is more expensive than the second method (FIG. 2), and the power conversion device 109 is expensive and the system becomes complicated.

  On the other hand, the second method (FIG. 2) is concerned with the first method (FIG. 1) because the feeder 106 and the power storage device 105 are directly connected and there is no power converter such as a step-up / down chopper. There is no problem, and the charge / discharge performance of the power storage device 105 can be maximized.

  On the other hand, since the feeder 106 and the power storage device 105 are in a directly connected state, when the voltage of the feeder 106 greatly fluctuates and the voltage between the two greatly deviates, the storage battery of the power storage device 105 is overdischarged or overcharged. There is a possibility of falling.

  Although this overcharge and overdischarge may have a significant impact on the life of the storage battery and must be avoided, in the prior art, the high-speed circuit breaker 108 (HSCB) is operated to connect the power storage device 105 to the feeder 106. It was separated from. That is, there was no other method other than stopping the function of the power storage device 105.

  The present invention has been made in view of the above problems, and does not use an expensive power conversion device that is a harmonic noise source, and there is no risk of overcharging and overdischarging of a storage battery constituting the power storage device. Providing feeding systems for electric railways.

  In order to achieve the above-described object, an electric railway power feeding system provided with a power storage device according to the present invention is an electric railway power feeding system having a power storage device. And a current control circuit in which a diode and a switch are arranged in series with the power storage device between a feeder having a positive potential of the feeding system and a return having a negative potential. Characteristic (CL1).

  The feeder system includes feeders, power storage devices, high-speed circuit breakers, current control circuits, and battery monitoring devices as main components. Note that a power receiving transformer, a rectifier, and a charging device for charging the power storage device may be included.

  According to this configuration, the power conversion device for adjusting the voltage difference between the feeder and the power storage device is not provided in the power storage device. The power conversion device adjusts the terminal voltage (output voltage) of the power storage device to match the voltage of the feeder line. The current control circuit includes a diode and a switch as main components. The current control circuit may be connected to the positive potential side or the negative potential side of the power storage device. The power storage device may be an assembly of secondary batteries or an electric double layer capacitor.

  In the electric railway feeding system including the power storage device according to the present invention, it is preferable that the current control circuit conducts / cuts off the current flowing through the power storage device (CL2).

  According to this configuration, the current control circuit cuts off or passes the current. If the current is cut off, no current flows through the power storage device connected in series with the current control circuit. If current flows, current flows through the power storage device. Here, the interruption of the current can be performed by a switch, but can also be performed by a diode. The diode cuts off the current when it is in reverse bias. In addition, when the forward bias state is entered, current flows.

  In the electric railway feeding system including the power storage device according to the present invention, the current control circuit is configured by a parallel circuit of the diode and the switch (CL3).

  According to this configuration, if the switch is closed, the current is allowed to flow regardless of the connection direction of the diode. If the switch is open, the current is interrupted or flows depending on the bias condition of the diode.

  In the electric railway feeding system including the power storage device according to the present invention, in the current control circuit, the diode is connected in a direction to cut off the current flowing from the return line to the feeder line (CL4).

  According to this configuration, the anode of the diode is connected to the negative potential side of the power storage device and the cathode is connected to the return line, or the anode of the diode is connected to the feeder, and the cathode is connected to the positive potential side of the power storage device. It is connected. If the switch is closed, current is passed regardless of the presence of the diode. On the other hand, if the switch is open, a current flows only in the direction of charging the power storage device, and the current in the discharging direction is interrupted.

  In the electric railway feeding system including the power storage device according to the present invention, in the current control circuit, the diode is connected in a direction to cut off the current flowing from the feeder to the return line (CL5).

  According to this configuration, the cathode of the diode is connected to the negative potential side of the power storage device and the anode is connected to the return line, or the cathode of the diode is connected to the feeder and the anode is connected to the positive potential side of the power storage device. It is connected. If the switch is closed, current is passed regardless of the presence of the diode. On the other hand, if the switch is open, a current flows only in the direction in which the power storage device is discharged, and the current in the charging direction is cut off.

  In the electric railway feeding system including the power storage device according to the present invention, the switch is preferably a power semiconductor element (CL6).

  According to this configuration, since a semiconductor element is used for the switch, it does not have a mechanical contact, so that maintenance work is simplified.

  In the electric railway feeding system including the power storage device according to the present invention, the current control circuit includes a first circuit in which a first diode and a first switch are connected in series, a second diode and a second switch connected in series. The first diode is connected in a direction to cut off the current flowing from the return line to the feeder line, and the second diode is connected from the feeder line to the return line. It is connected in a direction to cut off the flowing current (CL7).

  According to this configuration, a circuit in which a switch and a diode are connected in series is connected in parallel, and the bias directions of one diode and the other diode are opposite.

  In the electric railway feeding system including the power storage device according to the present invention, the current control circuit is constituted by a parallel connection of two thyristors (CL8). According to this configuration, the bias directions of one thyristor and the other thyristor connected in parallel are opposite to each other.

  In the current control circuit according to the present invention, a switch and a diode connected in a direction to cut off the current flowing from the return line to the feeder line are connected in parallel (CL9).

  Without using an expensive power converter such as a step-up / step-down chopper as shown in FIG. 1, there is a problem in the prior art while maintaining the advantage of directly connecting the power storage device to the feeder as shown in FIG. The problem that the power storage device is overdischarged and overcharged when the voltage of the feeder line fluctuates greatly can be solved.

It is a schematic block diagram of the feeder system of a prior art with which an electrical storage apparatus is connected to a feeder line via a power converter device. It is a schematic block diagram of the feeder system of the prior art in which an electrical storage apparatus is connected to a feeder line without going through a power converter device. 1 is a diagram showing a schematic configuration of a feeding system according to a first embodiment of the present invention. It is drawing which shows an example of the voltage-SOC characteristic of the storage battery used for the electrical storage apparatus. It is drawing which shows schematic structure of the feeding system which concerns on the 2nd Embodiment of this invention. It is drawing which shows schematic structure of the feeding system which concerns on the 3rd Embodiment of this invention. It is drawing which shows schematic structure of the feeding system which concerns on the 4th Embodiment of this invention.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments.

(First embodiment)
A first embodiment according to the present invention will be described with reference to a schematic configuration diagram shown in FIG.
The feeder system 9 shown in FIG. 3 has a feeder 6, a power storage device 5, a high-speed circuit breaker 8, a current control circuit 11, and a battery monitoring device 10 as main components. That is,

  Instead of the power converter for adjusting the voltage of the power storage device 5, the current control circuit 11 is connected between the feeder 6 having a positive potential of the feeder system and the return line 7 having a negative potential. Connected in series. The DC power from the power storage device 5 can be supplied to the electric vehicle 1 via the feeder 6 according to the state of the current control circuit 11, and the regenerative power can be absorbed by the power storage device 5. It is configured.

  The power storage device 5 is configured by connecting a plurality of unit storage batteries (cells) in series. In the present embodiment, the number of unit storage batteries in series is selected so that the power storage device 5 is not overcharged even when the voltage of the feeder 6 is maintained at the maximum voltage.

  The current control circuit 11 is provided with a diode 12 that blocks a current in the discharge direction in series with the power storage device 5, and a switch 13 in parallel with the diode 12. Specifically, the anode of the diode 12 is connected to the negative potential side of the power storage device 5, and the cathode of the diode 12 is connected to the return line 7 of the feeding system 9 via the high speed circuit breaker 8.

  The battery monitoring device 10 reads signals from various measuring instruments (not shown) attached to the power storage device 5 into the battery monitoring device 10 via the wiring 16 and monitors the state of the power storage device 5. The state quantities read by the battery monitoring device 10 include the voltage (cell voltage) of the unit storage battery, the temperature, pressure, and current of the power storage device 5. In the state monitoring, if an abnormality of the power storage device 5 is detected, an alarm is output. Further, if the abnormality progresses, the high-speed circuit breaker 8 is opened via the wiring 18 and the power storage device 5 is urgently stopped.

  In addition, the battery monitoring device 10 performs opening / closing control of the switch 13 that is a component of the high-speed circuit breaker 8 and the current control circuit 11, and also determines the SOC (State Of Charge) of the power storage device 5 from the state quantity such as the current value. Perform the calculation. The switch 13 may be a circuit breaker or a semiconductor element such as a thyristor or IGBT.

Next, the operation of the first embodiment shown in FIG. 3 will be described.
In this embodiment, the rated voltage of the feeding system is 600V, and the assumed maximum voltage is 660V.

  FIG. 4 shows the SOC characteristics of the storage battery of the power storage device 5 used in this embodiment. The SOC is an amount indicating the state of charge of the storage battery, where 100% indicates a fully charged state and 0% indicates a fully discharged state. That is, 100% or more means overcharge, and 0% or less means overdischarge.

  From FIG. 4, when the cell voltage at which the power storage device 5 is not overcharged / overdischarged is read, the maximum allowable voltage at which overcharge does not occur is about 1.45 V / cell at SOC 100%, and the minimum allowable voltage at which overdischarge does not occur is SOC 0%. It turns out that it is about 1.25V / cell.

  Here, when the number of series cells of the power storage device 5 that is not overcharged even when the assumed maximum voltage of 660 V is sustained, it can be seen from Equation 1 that 455.2 cells or more are necessary. From this result, in this embodiment of FIG. 3, the serial number of the unit storage batteries of the power storage device 5 is 456 cells.

  Next, when the voltage of the feeder line 6 at which the storage battery has the lowest allowable voltage is obtained, it becomes 570 V from Equation 2. That is, in this embodiment of FIG. 3, when the voltage of the feeder 6 is continuously below 570 V, the power storage device 5 falls into overdischarge.

  In the embodiment of FIG. 3, when the switch 13 is turned on, the circuit configuration is the same as that of FIG. 2, which is the prior art. That is,

  The electric current from the power storage device 5 is supplied from the feeder 6 to the electric vehicle 1 via the overhead line 2 and the electric vehicle 1 travels. When the regenerative brake is activated, the traveling motor 4 serves as a generator, and the generated regenerative electric power is sent to the feeder system 9 via the feeder 6 to charge the power storage device 5.

  Here, when the voltage of the feeder 6 continues to be lower than 570 V obtained in Equation 2, and the battery monitoring device 10 detects overdischarge of the power storage device 5, that is, SOC 0%, the battery monitoring device 10 is connected to the wiring 17. The switch 13 is opened via Even when the switch 13 is open, regenerative power and the like flowing from the feeder 6 is absorbed by the power storage device 5 through the diode 12. However, since the current in the discharge direction is blocked by the diode 12, it is not discharged. That is, since the power storage device 5 is only charged, overdischarge of the power storage device 5 is prevented.

  Thereafter, when the power storage device 5 is charged and, for example, it is determined that the SOC of the storage battery has recovered to 10% or more and there is no risk of overdischarge, the switch 13 is turned on again. When the switch 13 is turned on again, a circuit equivalent to that shown in FIG. 2 is obtained.

  In addition, it is good also considering the voltage drop of the feeder 6 or the electrical storage apparatus 5 as conditions as an open condition of the switch 13 besides the SOC conditions of a storage battery. Similarly, as a condition for turning on the switch 13 again, a voltage increase of the feeder 6 or the power storage device 5 may be used as a condition in addition to the SOC condition.

  In the case of the present embodiment in FIG. 3, since the charging from the feeder 6 to the power storage device 5 is continuously performed while the switch 13 is open, the main purpose is to absorb surplus regenerative power. The power storage device 5 operates effectively. Moreover, since it is also possible to arbitrarily set the SOC value used for switching control of the switch 13, the power storage device 5 can be maintained at an arbitrary SOC or higher, that is, to the feeder 6 at the time of a substation blackout It is also effective as a power storage device 5 for the purpose of emergency power feeding. For example, if control is performed to open the switch 13 when SOC 70% or less is detected, the SOC of the power storage device 5 can be maintained at 70% or more at all times. Then, it becomes possible to supply electric power for 70% of SOC to the feeder 6 from the power storage device 5, and the electric vehicle on the track can be run using the electric power.

(Second Embodiment)
Next, a second embodiment of the present invention is shown in FIG.
In the power storage device 5, the number of unit storage batteries in series is selected so that overdischarge does not occur even when the voltage of the feeder 6 is maintained at the minimum voltage.

  The current control circuit 21 includes a diode 22 that blocks current in the charging direction in series with the power storage device 5, and a switch 23 in parallel with the diode 22. Specifically, the cathode of the diode 22 is connected to the negative potential side of the power storage device 5, and the anode of the diode 22 is connected to the return line 7 of the feeding system 9 via the high speed circuit breaker 8.

  The battery monitoring device 10 is the same as that of the first embodiment of the present invention shown in FIG. As in the first embodiment of the present invention, a circuit breaker or a semiconductor element such as a thyristor or IGBT may be used instead of the switch 23.

  The operation of the second embodiment of the present invention shown in FIG. 5 will be described. In this embodiment, the rated voltage of the voltage of the feeder 6 is 600V, and the assumed minimum voltage is 560V.

  Further, as in the first embodiment, it can be seen from FIG. 4 that the maximum allowable voltage at which the unit storage battery used is not overcharged is 1.45 V / cell, and the minimum allowable voltage at which overdischarge is not performed is 1.25 V / cell. .

  Here, when the number of series cells in which the power storage device 5 is not over-discharged even when the minimum voltage of 560 V is maintained, it is found that it is necessary to set the number to 448 cells or less from Equation 3. From this result, in this embodiment, the serial number of the unit storage batteries of the power storage device 5 is 448 cells.

  Next, when the voltage of the feeder line 6 at which the storage battery has the maximum allowable voltage is obtained, it becomes 649.6 V from Equation 4. That is, in this embodiment, when the voltage of the feeder 6 continuously exceeds 649.6 V, the power storage device 5 falls into overcharge.

  In this embodiment, when the switch 23 is turned on, the circuit configuration is the same as that in FIG. 2 which is the prior art, and the power storage device 5 is repeatedly charged and discharged by voltage fluctuations of the feeder 6. That is,

  The electric current from the power storage device 5 is supplied from the feeder 6 to the electric vehicle 1 via the overhead line 2 and the electric vehicle 1 travels. When the regenerative brake is activated, the traveling motor 4 serves as a generator, and the generated regenerative electric power is sent to the feeder system 9 via the feeder 6 to charge the power storage device 5.

  Here, when the state where the voltage of the feeder line 6 exceeds 649.6 V obtained in Equation 4 continues and the battery monitoring device 10 detects overcharge of the power storage device 5, that is, SOC 100%, the battery monitoring device 10 opens and closes. The vessel 23 is opened. Even when the switch 23 is open, power continues to be supplied from the power storage device 5 to the feeder 6, but the current in the charging direction is blocked by the diode 22, so regenerative power is not absorbed. That is, since the power storage device 5 is only discharged, overcharging of the power storage device 5 is suppressed.

  Thereafter, when it is determined that the SOC of the storage battery has dropped to 90% or less due to the discharge from the power storage device 5 and there is no risk of overcharging, the switch 23 is turned on again. When the switch 23 is turned on again, a circuit equivalent to that shown in FIG. 2 is obtained.

  Note that, as an open condition of the switch 23, in addition to the SOC condition of the power storage device 5, a voltage increase of the feeder 6 or the power storage device 5 may be used as a condition. Similarly, as a condition for turning on the switch 23 again, a voltage drop of the feeder 6 or the power storage device 5 may be used as a condition in addition to the SOC condition.

  In the case of the present embodiment, since the power supply from the power storage device 5 to the feeder 6 is continuously performed while the switch 23 is open, the ground power storage device for electric railways mainly for the purpose of suppressing the reduction of the feeder voltage. It is effective for.

(Third embodiment)
Next, FIG. 6 shows a third embodiment having the characteristics of both the first and second embodiments shown in FIG. 3 and FIG.

  A current control circuit 31 is connected in series with the power storage device 5. In the current control circuit 31, a circuit in which the first diode 32 and the first switch 33 are connected in series and a circuit in which the second diode 34 and the second switch 35 are connected in series are connected in parallel. Has been configured. The first diode is connected in a direction that prevents a current in the discharging direction of the power storage device 5, and the second diode 34 is connected in a direction that prevents a current in the charging direction of the power storage device 5.

  In FIG. 6, when both the first switch 33 and the second switch 35 are turned on, the circuit is the same as that in FIG. 2, which is the prior art, and the power storage device 5 is freely charged by voltage fluctuations of the feeder 6. Repeat the discharge.

  If the battery monitoring device 10 detects the SOC 0% of the power storage device 5 due to the voltage drop of the feeder 6, the feeder 6 can be maintained by opening the second switch 35 while keeping the first switch 33 closed. Although the regenerative power from is absorbed by the power storage device 5 through the first diode 32, the current in the discharge direction is blocked by the first diode 32, so that no discharge is performed and the SOC of the power storage device 5 rises. That is, the operation is the same as that of the first embodiment shown in FIG.

  Conversely, when the battery monitoring device 10 detects the SOC 100% of the power storage device 5 due to the voltage rise of the feeder 6, if the first switch 33 is opened and the second switch 35 is kept on, Although power supply from the device 5 to the feeder 6 is performed through the second diode 34, the current in the charging direction is blocked by the second diode 34, so regenerative power is not absorbed and the SOC of the power storage device 5 decreases. That is, the operation is the same as that of the second embodiment shown in FIG. In addition, the recharging conditions after opening the first and second switches 33 and 35 are the same as those in the first and second embodiments.

  Also in the present embodiment of FIG. 6, as in the first and second embodiments, the conditions for opening / re-opening the first and second switches 33 and 35 are not limited to the SOC condition of the power storage device 5, but the feeder 6 As a matter of course, the voltage of the power storage device 5 or the voltage increase / decrease of the power storage device 5 may be used as a condition.

  In the present embodiment of FIG. 6, a semiconductor element such as a circuit breaker or a thyristor may be employed instead of the first and second switches 33 and 35. When the semiconductor element is employed, the first and second diodes 32 and 34 can be omitted because the semiconductor element itself has a rectifying action.

(Fourth embodiment)
According to the fourth embodiment of the present invention shown in FIG. 7, a thyristor can be employed instead of the switch. A current control circuit 41 is configured by connecting the first thyristor 43 and the second thyristor 44 in parallel so that the polarities are opposite to each other. If a thyristor is used, the diode can be omitted.

  In FIG. 7, when both the first thyristor 43 and the second thyristor 44 are in a conductive state, the circuit is equivalent to that of FIG. 2, which is the prior art, and the power storage device 5 repeats charging and discharging freely due to voltage fluctuations of the feeder 6. .

  If the battery monitoring device 10 detects the SOC 0% of the power storage device 5 due to the voltage drop of the feeder 6, the feeder will be maintained if the second thyristor 44 is cut off while holding the first thyristor 43 in the conducting state. Although the regenerative power from 6 is absorbed by the power storage device 5 through the first thyristor 43, the current in the discharge direction is blocked by the second thyristor 44, so that no discharge is performed and the SOC of the power storage device 5 rises. That is, the operation is the same as that of the first embodiment shown in FIG.

  Conversely, if the battery monitoring device 10 detects the SOC 100% of the power storage device 5 due to the voltage rise of the feeder 6, if the second thyristor 44 is held in the conductive state while the first thyristor 43 is shut off, the battery can be charged. Although power is supplied from the device 5 to the feeder 6 through the second thyristor 44, the current in the charging direction is blocked by the first thyristor 43, so regenerative power is not absorbed and the SOC of the power storage device 5 is lowered. That is, the operation is the same as that of the second embodiment shown in FIG. The re-conduction conditions after the first thyristor 43 and the second thyristor 44 are shut off are the same as those in the first and second embodiments.

  As described above, according to the present invention, without using the power converter such as the expensive step-up / step-down chopper shown in FIG. 1, while maintaining the advantage of directly connecting the power storage device to the feeder as shown in FIG. It is possible to solve the problem that the power storage device overdischarges or overcharges when the voltage of the feeder 6 greatly fluctuates.

  In this embodiment, by adding means having a rectifying action such as a diode in series with the power storage device and means for interrupting current such as a switch, the concern is maintained while maintaining the superiority of the direct connection method in FIG. This is an invention for solving the overcharge / overdischarge of the power storage device due to the voltage fluctuation of the feeder 6.

  The control device for the electric railway power storage device according to the present invention can be suitably used as a control device for an electric railway feeding system.

DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Overhead wire 4 Driving motor 5 Power storage device 6 Feeding wire 7 Return wire 8 High speed circuit breaker 9 Feeding system 10 Battery monitoring device 11 Current control circuit 12 Diode 13 Switch 16 Wiring 17 Wiring 18 Wiring 21 Current control circuit 22 diode 23 switch 31 current control circuit 32 first diode 33 first switch 34 second diode 35 second switch 41 current control circuit 43 first thyristor 44 second thyristor 101 electric vehicle 102 overhead wire 104 motor 105 for running Device 106 Wire 108 High-speed circuit breaker 109 Power converter

Claims (9)

An electric railway feeding system having a power storage device,
The power storage device is not provided with a power converter for adjusting the voltage,
An electric railway comprising a power storage device in which a current control circuit having a diode and a switch is connected in series with the power storage device between a feeder having a positive potential and a return having a negative potential of the feeder system Nokiden system.   The electric railway feeding system comprising the power storage device according to claim 1, wherein the current control circuit conducts / cuts off a current flowing through the power storage device.   The feeding system of the electric railway provided with the electrical storage apparatus as described in any one of Claim 1 or 2 with which the said current control circuit is comprised with the parallel circuit of the said diode and the said switch. In the current control circuit,
The feeding system of the electric railway provided with the electrical storage apparatus as described in any one of Claims 1-3 to which the said diode is connected in the direction which interrupts | blocks the electric current which flows into the said feeder from the said return line. In the current control circuit,
The electric power feeding system of the electric railway provided with the electrical storage apparatus as described in any one of Claims 1-3 to which the said diode is connected in the direction which interrupts | blocks the electric current which flows into the said return line from the said feeder.   The electric switch for an electric railway provided with the power storage device according to claim 1, wherein the switch is a power semiconductor element. The current control circuit is a circuit in which a first circuit in which a first diode and a first switch are connected in series and a second circuit in which a second diode and a second switch are connected in series are connected in parallel,
2. The first diode is connected in a direction to cut off current flowing from the return line to the feeder line, and the second diode is connected in a direction to cut off current flowing from the feeder line to the return line. An electric railway feeding system comprising the power storage device according to claim 1.   The electric power feeding system of the electric railway provided with the electrical storage apparatus as described in any one of Claim 1 or 2 with which the said current control circuit is comprised from the parallel connection of two thyristors. The current control circuit according to any one of claims 1 and 2,
A current control circuit in which a switch and a diode connected in a direction to cut off a current flowing from the return line to the feeder line are connected in parallel.

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