JP5265276B2 - Main circuit system, power supply method - Google Patents

Description

  The present invention relates to a main circuit system and a power supply method in which a battery device is mounted on a vehicle for a railway vehicle, and the battery device is charged and discharged.

  The power supply of conventional railway vehicles (electric vehicles) is supplied from overhead lines. FIG. 5 is a schematic configuration diagram showing a configuration of a conventional railway vehicle for an electric vehicle. The pantograph 100, the circuit breaker 110, and the filter 120 are connected in series and connected to the inverter 130. The other terminal of the inverter 130 is connected to the grounding terminal 150 via the power line, so that power supplied from the outside is supplied to the inverter 130. The electric power converted by the inverter 130 is supplied from the motor 140-1 to the motor 140-n. By supplying electric power to the motors 140-1 to 140-n, the railway vehicle travels.

In general, such a railway vehicle cannot receive a supply from an overhead line and cannot run when a power failure or the like occurs. There has also been proposed one in which an energy storage device is mounted on such a railway vehicle (see, for example, Patent Document 1). This energy storage device is premised on the use of capacitors.
Here, in recent years, even if the supply of electric power from the overhead line is stopped, it is considered to install a battery as an energy storage device other than a capacitor in the railway vehicle in order to run the railway vehicle of the electric vehicle, for example. Has been.
In addition, there is an emergency power supply for turning on the emergency light in the vehicle when power supply cannot be received, but this is only enough to turn on the emergency light, and it is assumed that the vehicle is running. It is not a thing.
JP 2007-151392 A

  However, when a battery is mounted on a railway vehicle, many main circuit systems of an electric railway vehicle are compatible with the DC1500V system (an electric vehicle having a reference voltage of DC1500V ensures its vehicle performance). From the viewpoint of protecting the ground equipment, the voltage fluctuation range is set to 1850 to 900 V). Currently, the battery that can be mounted on a vehicle has a maximum voltage of about 800 V. In order to use this as a power source, there is a problem that a large-capacity step-up / step-down chopper device is required and the size of the device increases, and the battery supply capacity cannot be increased. There is a problem that the battery capacity is quickly lost. Therefore, mounting of such a backup battery device that assumes a power failure of a railway vehicle of an electric vehicle has not been put into practical use.

  The present invention has been made in view of such circumstances, and an object of the present invention is to make it possible to run a railway vehicle of an electric vehicle with electric power supplied from a battery while suppressing an increase in size of the apparatus. It is to provide a power supply method.

In order to solve the above-described problems, the present invention is a main circuit system used in a railway vehicle that travels by receiving power supplied from an overhead line and driving a motor, the battery storing power, An inverter that receives power of a first drive voltage that is a voltage corresponding to power supplied from an overhead line or a second drive voltage that is lower than the first drive voltage, and supplies power to the motor A circuit, a voltage determination unit for determining whether or not a voltage of power supplied to the inverter circuit is equal to or higher than a first reference value determined in advance, and stores the power supplied from the overhead wire in the battery Based on the determination result of the charging circuit and the voltage determination unit, when the voltage of power supplied to the inverter circuit is equal to or higher than a first reference value, the charging circuit supplies the overhead line The inverter circuit is driven by the first drive voltage and the voltage of the power supplied to the inverter circuit does not reach the first reference value. A control circuit for switching the voltage to the second drive voltage to drive the inverter circuit, an auxiliary power source for stepping down the voltage of power supplied from the overhead wire, and one terminal connected to the battery Includes a diode connected to a connection point between a filter connected to the inverter and a circuit breaker connected to a pandagraph, and the charging circuit is configured to use the power output from the auxiliary power source during charging. to charge the battery, at the time of discharge is supplied to the inverter through the diode power from the battery, the inverter When the voltage of the power supplied to the road does not reach the first reference value, and performs supply of power to the inverter circuit and the air motor brake from the battery.

  Further, the present invention is the above main circuit system, wherein the charging circuit energizes a traveling current capable of driving the motor when the battery is discharged, and is more than the traveling current when the battery is charged. The battery is charged with a small current.

The present invention is also a power supply method in a main circuit system used in a railway vehicle that travels by receiving power supplied from an overhead line and driving the motor, wherein the voltage determination unit drives the motor of the vehicle. Determining whether the voltage of the power supplied to the inverter circuit that supplies the power is equal to or higher than a predetermined first reference value, the control unit based on the determination result of the voltage determination unit, When the voltage of the electric power supplied to the inverter circuit is equal to or higher than the first reference value, the electric power supplied from the overhead line is charged to the battery by a charging circuit that receives the battery device, and the first driving voltage When the inverter circuit is driven and the voltage of the power supplied to the inverter circuit does not reach the first reference value, the inverter drive voltage is Switching to the second drive voltage, the power supplied from the battery is supplied to the inverter circuit and driven, and the inverter circuit is a first drive voltage that is a voltage corresponding to the power supplied from the overhead line or , Receiving a power of a second driving voltage that is a driving voltage lower than the first driving voltage, supplying power to the motor, and the main circuit system supplies a power voltage supplied to the inverter circuit to the first voltage. When the reference value of 1 is not reached, power is supplied from the battery to the inverter circuit and the brake air motor, and an auxiliary power source steps down the voltage of the power supplied from the overhead line, and the charging circuit When charging, the battery is charged with the power output from the auxiliary power supply, and when discharging, the power from the battery is connected to one terminal connected to the battery. Via the diode terminal is connected to a connection point between the connected circuit breakers connected filters and pantograph to the inverter and supplied to the inverter, the voltage of the power supplied to the inverter circuit is first When the reference value of 1 is not reached, electric power is supplied from the battery to the inverter circuit and the brake air motor.

  As described above, the present invention is selectively required for traveling by making the battery device, the battery charging / discharging device, the inverter device for the brake air motor, and the main power conversion device compatible with two voltages (DC 1500 V system and DC 600 system). It becomes possible to provide a main circuit system for a railway vehicle of an electric vehicle that can cope with a power failure that is supplied from a battery with only a small amount of electric power.

  Further, in the present invention, the battery charging is performed with a small current during normal charging, and the battery charging / discharging device can be reduced in size and weight because the battery discharging is performed via the current limiting element. In addition, when the battery is discharged, it is possible to supply power only to inverters and brake air motors that correspond to the battery voltage, so it is possible to reliably supply power when it is necessary to move during a power failure. Become.

  As described above, according to the present invention, it is determined whether or not the voltage of the power supplied to the inverter circuit is equal to or higher than the first reference value determined in advance. Based on the determination result, the inverter circuit When the voltage of the supplied power is equal to or higher than the first reference value, the battery is charged with the power supplied from the overhead line by the charging circuit, and the inverter circuit is driven by the first driving voltage and supplied to the inverter circuit. When the voltage of the power to be reached does not reach the first reference value, the inverter drive voltage is switched to the second drive voltage to drive the inverter circuit. Thus, the motor can be driven by driving the inverter with a drive voltage lower than the first drive voltage when the motor is driven by the power supplied from the overhead line and the power is not supplied from the overhead line. The motor can be driven by the battery, and the vehicle can be driven even when electric power cannot be received from the overhead wire.

Hereinafter, a railway electric vehicle main circuit system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing a configuration of a railway electric vehicle main circuit system 1 according to an embodiment of the present invention.
The pantograph 10 receives power supplied from an overhead line. The circuit breaker 11 is connected to the pantograph 10 and interrupts the circuit when electric power exceeding a predetermined level is supplied. The filter 12 is connected to the circuit breaker 11 and removes noise components.

The inverter 13 receives power (direct current) supplied via the filter 12, converts this power into power voltage (three-phase alternating current) that can be driven by the motors 140-1 to 140-n, and outputs the voltage. . The other terminal of the inverter 13 is connected to a grounding terminal 15.
Further, the inverter 13 is a first drive voltage (for example, DC 1500V system) that is a voltage corresponding to the power supplied from the overhead line via the pantograph 10 or a second drive voltage that is lower than the first drive voltage. Is supplied to the motors 14-1 to 14-n. Thus, the inverter 13 can be driven by any voltage of the DC1500V system and the DC600V system.

  The motors 140-1 to 140-n are connected to the inverter 13 and are driven by AC power output from the inverter 13. The output of the motors 140-1 to 140-n is transmitted to the wheels, so that the railway vehicle travels.

  The charging device 16 receives the power supplied from the overhead wire via the pantograph 10 and accumulates it in the battery device 17. This charging device 16 is connected to the pantograph 10 and the terminal 15, and is connected in parallel to the inverter 130. Specifically, a terminal between the pantograph 10 and the circuit breaker 11 is connected to one terminal of the charging device 16, and this terminal is connected to an anode terminal of a switching element 161 provided in the charging device 16. The The cathode terminal of the switching element 161 is connected to the battery device 17 to charge the battery device 17, and a control signal output from the control circuit 18 is input to the gate signal of the switching element 161. As the switching element 161, a semiconductor switching element is used, and examples thereof include an IGBT (Insulated Gate Bipolar Transistor) and a thyristor.

  The charging device 16 is provided with a diode 162. The cathode terminal of the diode 162 is connected between the circuit breaker 11 and the filter 12, the cathode terminal is connected to the battery device 17, and the motors 14-1 to 14-n can be driven when the battery device 17 is discharged. A current for running is supplied, and electric power output from the battery device 17 is supplied to the inverter 13 via the filter 12.

The charging device 16 is charged by being supplied to the battery device 17 via the switching element 161 in a normal time (when power is received from an overhead line and charging is performed). At the time of this charging, a current limiting element (for example, a resistor) is provided, and charging is performed by limiting the charging current supplied to the battery device 17 so that the current becomes smaller than the current of the power supplied from the overhead wire. Also good.
Further, the charging device 16 supplies power to the inverter 13 via the diode 162 at the time of discharging (when power from the overhead wire is not supplied). In this embodiment, the charging device 16 may output the voltage supplied from the battery device 17 to the inverter 13 without particularly raising or lowering the voltage.
Further, the charging device 16 determines whether or not SOC (state of charge), which is a ratio of the remaining charge to the charge capacity of the battery, is equal to or greater than a predetermined value (for example, whether it is equal to or greater than 100). If it is equal to or greater than a predetermined value, the charging is stopped.

The battery device 17 performs charging by receiving the charging current supplied from the charging device 16 during charging, and supplies power to the inverter 13 during discharging. As the battery device 17, for example, a secondary battery such as a lithium ion battery, a nickel cadmium battery, or a nickel metal hydride battery is used.
In the control circuit 18, the voltage of the power supplied to the inverter 13 is equal to or higher than a predetermined first reference value (here, any voltage between the first drive voltage and the second drive voltage). It has a voltage determination function for determining whether or not.
In addition, based on the determination result by the voltage determination function, the control circuit 18 supplies the power supplied from the overhead line by the charging device 16 to the battery device 17 when the voltage of the power supplied to the inverter 13 is equal to or higher than the first reference value. When the inverter circuit is driven by the first drive voltage and the voltage of the power supplied to the inverter 13 does not reach the first reference value, the drive voltage of the inverter 13 is changed to the second drive voltage. Switch to drive the inverter circuit. As described above, the control circuit 18 detects the voltage of the power supplied to the inverter 13 via the filter 12, and is driven by the DC1500V system as a driving method of power that can drive the inverter 13 according to the detected voltage. Or whether to drive with a DC 600V system.
In addition, the control circuit 18 supplies a gate current to the switching element 161 of the charging device 16 and instructs to start charging.

Next, the operation of the main circuit system in the above configuration will be described with reference to the flowchart of FIG.
First, when the power supplied from the overhead line is supplied to the inverter 13 via the circuit breaker 11 and the filter 12, the control circuit 18 detects the voltage of this power and supplies the power to the inverter 13. It is determined whether or not the voltage is equal to or higher than a first reference value (step S10).
When it is determined that the voltage to the inverter 13 is low, that is, not higher than the first reference value, the control circuit 18 instructs the circuit breaker to release, and determines whether or not the circuit breaker 11 has been released. (Step S11). If the circuit breaker has not been released, the control circuit 18 waits until release is detected, and if it is detected that the circuit breaker 11 has been released, the control circuit 18 instructs the charging device 16 to discharge (step S12). ). Thereby, electric power is supplied from the battery device 17 to the inverter 13. Then, the control circuit 18 determines whether or not to end the process. When it is determined that the process is to be ended, the control circuit 18 ends the process, and when it is determined that the process is not to be ended, the process proceeds to step S10.

  On the other hand, when it is determined in step S10 that the voltage to the inverter 13 is not a low voltage, that is, is equal to or higher than the first reference value, the control circuit 18 outputs a gate signal to the charging device 16 to thereby charge the battery. Is instructed (step S14). Thereby, the battery device 17 is charged by the charging device 16.

Next, the operation of the charging device 16 after receiving the charging instruction from the control circuit 18 will be described with reference to the flowchart of FIG.
First, the charging device 16 determines whether or not the voltage of the battery device 17 is equal to or higher than a predetermined upper limit value (step S20). If it is equal to or greater than the upper limit value, the charging device 16 stops charging the battery (step S21), determines whether or not to end the process, and if it is determined to end, ends the process and does not end. When it determines, it transfers to step S20.
In step S20, when the battery voltage is not equal to or higher than the upper limit value, the charging device 16 determines whether or not the battery SOC is 100 or higher (step S23). If the SOC of the battery is 100 or more, the charging device 16 proceeds to step S21. If the SOC of the battery is not 100 or more, the charging device 16 charges the battery (step S24), and proceeds to step S22.

FIG. 4 is a schematic block diagram showing a configuration in another embodiment of the main circuit system 1. In this figure, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.
In this figure, the charging device 16 </ b> A is supplied with power from the auxiliary power source and charges the battery device 17. The auxiliary power supply device converts DC power supplied from an overhead wire into AC power and transforms it into a voltage of 440V, 200V, 100V, etc., and mainly outputs air conditioning in a vehicle. Supply power to lighting and emergency lights.
Since the charging device 16A performs charging using the power supplied from the auxiliary power supply device, the current after the power supplied from the overhead line is reduced to be smaller than the current for traveling. Is charged with the charging current. As this auxiliary power source, for example, a static inverter (SIV) is used.

Details of the charging device 16A will be further described.
In the charging device 16 </ b> A, a diode 167 is connected in series between one terminal of the battery device 17 and a connection point between the circuit breaker 11 and the filter 12, and the other terminal of the battery device 17. The switch 163 is connected to the terminal 15. When the battery device 17 is discharged, the charging device 16 </ b> A turns on this switch 163 and supplies power from the battery device 17 to the inverter 13.

  In the charging device 16 </ b> A, the battery device 17 is between a connection point between the diode 167 and one terminal of the battery device 17 and a connection point between the switch 163 and the other terminal of the battery device 17. In parallel, a circuit in which a diode 164, a diode 165, and a resistor 166 are connected in series is configured. Here, three sets of circuits in which diodes 164 and 165 are connected in series are connected in parallel. In each set, electric power from the auxiliary power source is supplied between the diode 164 and the diode 165, and the battery device 17 is charged during charging.

  In this figure, when charging the battery device 17, the charging device 16 </ b> A charges the battery device 17 with the power output from the auxiliary power source. As a result, the voltage of the power supplied from the overhead wire is stepped down by the auxiliary power supply device, and the battery device 17 is charged by the charging device 16A by receiving the stepped down power. 16A can be reduced in size.

  Further, the program for realizing the functions of the charging device 16 and the control circuit 18 in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. Thus, the battery device 17 may be charged and discharged. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

1 is a schematic block diagram showing a configuration of a railway electric vehicle main circuit system 1 according to an embodiment of the present invention. It is a flowchart explaining operation | movement of a main circuit system. 4 is a flowchart illustrating an operation of charging device 16 after receiving a charging instruction from control circuit 18; It is a schematic block diagram which shows the structure in other embodiment of the main circuit system 1. It is a schematic block diagram which shows the structure of the conventional railway vehicle of an electric vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main circuit system 10 Pantograph 11 Circuit breaker 12 Filter 13 Inverter 14-1 to 14-n Motor 16, 16A Charging device 17 Battery device 18 Control circuit

Claims (3)

A main circuit system used for a railway vehicle that travels by receiving power supplied from an overhead line and driving a motor,
A battery for storing power;
The first drive voltage, which is a voltage corresponding to the power supplied from the overhead wire, or the second drive voltage, which is a drive voltage lower than the first drive voltage, is received, and the power is supplied to the motor. An inverter circuit;
A voltage determination unit that determines whether or not a voltage of power supplied to the inverter circuit is equal to or higher than a predetermined first reference value;
A charging circuit for accumulating electric power supplied from the overhead wire in the battery;
Based on the determination result of the voltage determination unit, when the voltage of the power supplied to the inverter circuit is equal to or higher than a first reference value, the battery supplies the power supplied from the overhead line by the charging circuit, and When the inverter circuit is driven by the first driving voltage and the voltage of the power supplied to the inverter circuit does not reach the first reference value, the driving voltage of the inverter is switched to the second driving voltage. A control circuit for driving the inverter circuit;
An auxiliary power source for stepping down the voltage of the power supplied from the overhead line;
A diode connected to a connection point between a filter connected to the battery and a circuit breaker connected to a pandagraph, one terminal connected to the battery and the other terminal connected to the inverter;
The charging circuit charges the battery with power output from the auxiliary power source during charging, supplies power from the battery to the inverter via the diode during discharging,
When the voltage of the electric power supplied to the inverter circuit does not reach the first reference value, electric power is supplied from the battery to the inverter circuit and the brake air motor. The charging circuit energizes a traveling current capable of driving the motor when the battery is discharged, and charges the battery with a current smaller than the traveling current when the battery is charged. The main circuit system according to claim 1. A power supply method in a main circuit system used for a railway vehicle that travels by receiving power supplied from an overhead line and driving a motor,
The voltage determination unit determines whether or not the voltage of the power supplied to the inverter circuit that supplies power for driving the motor of the vehicle is equal to or higher than a predetermined first reference value,
The control unit
Based on the determination result of the voltage determination unit, when the voltage of the power supplied to the inverter circuit is equal to or higher than a first reference value, the power supplied from the overhead line to the battery by the charging circuit that receives the battery device is supplied to the battery. When the inverter circuit is driven by the first drive voltage and the voltage of the power supplied to the inverter circuit does not reach the first reference value, the drive voltage of the inverter is set to the second voltage. Switch to the drive voltage, supply the electric power supplied from the battery to the inverter circuit and drive it,
The inverter circuit receives power of a first drive voltage that is a voltage corresponding to the power supplied from the overhead wire or a second drive voltage that is a drive voltage lower than the first drive voltage, and receives the power from the motor Supply power,
When the voltage of the power supplied to the inverter circuit does not reach the first reference value, the main circuit system supplies power from the battery to the inverter circuit and the brake air motor ,
The auxiliary power supply steps down the voltage of the power supplied from the overhead line,
The charging circuit charges the battery with power output from the auxiliary power source during charging, and from the battery during discharging, one terminal is connected to the battery and the other terminal is connected to the inverter. Supply to the inverter through a diode connected to the connection point between the filter and the circuit breaker connected to the pandagraph,
When the voltage of the electric power supplied to the inverter circuit does not reach the first reference value, the electric power is supplied from the battery to the inverter circuit and the brake air motor.

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