JP7301686B2 - power conversion system - Google Patents

Description

Embodiments of the present invention relate to power conversion systems.

When an electric train passes through a no-power section in which power is not supplied to the overhead wire, the electric train is not supplied with power from the overhead wire. Also, when a power outage occurs, power supply from overhead lines is stopped.

In addition, for example, when an electric car moves in a garage, the efficiency of maintenance work can be improved by securing a power source and making it possible to move even when power is not available from overhead wires. There is expected.

JP 2017-225280 A

BACKGROUND ART Mounting a battery device on an electric car as a power supply when power is not supplied from an overhead line is under study.
However, if the battery device is not sufficiently charged at the timing when the user wants to use the battery device, there is a possibility that the electric vehicle cannot operate as expected.

In addition, if power can be supplied from the external power supply to the auxiliary equipment and various loads at the timing when power is not supplied from the overhead wire, it is possible to perform work without reducing the energy stored in the battery device. .

The embodiments of the present invention have been made in view of the above circumstances, and it is an object of the present invention to provide a power conversion system that can utilize power supplied from an external power source other than overhead wires.

A power conversion system according to an embodiment includes a transformer that steps down power from an overhead line, and an AC-DC power converter for running that converts and outputs AC power supplied via a secondary winding of the transformer. , a driving DC-AC power conversion unit for converting the DC power output from the driving AC-DC power conversion unit into driving power for a driving motor; A load AC-DC power converter that converts AC power supplied through a tertiary winding into DC power, and the DC power converted by the load AC-DC power converter is converted into AC power and output. and a DC load supplied with power output from the load DC-AC power conversion unit via a transformer and a rectifier; A power line connecting the load AC-DC power conversion unit and the load DC-AC power conversion unit, and a power line connecting the running AC-DC power conversion unit and the running DC-AC power conversion unit. and an auxiliary machine connected to a power line connecting the auxiliary power conversion device and the battery device and operable by power supplied from the battery device, wherein the auxiliary power supply The power conversion device for the load is obtained from an external power supply connection detection unit that detects that an external power supply is connected, and a power line that connects the AC-DC power conversion unit for the load and the DC-AC power conversion unit for the load. a chopper circuit that converts the voltage of DC power into a predetermined value and outputs the voltage to the battery device; and a load power control unit that operates the chopper circuit and controls the battery device to be charged by the power supplied from the external power supply.

FIG. 1 is a schematic side view of a railway vehicle equipped with a power conversion system according to an embodiment. Drawing 2 is a figure showing roughly one example of composition of a power conversion system of an embodiment. FIG. 3 is a diagram schematically showing another configuration example of the power conversion system of the embodiment.

A power conversion system according to an embodiment will be described below with reference to the drawings.
FIG. 1 is a schematic side view of a railway vehicle equipped with a power conversion system according to an embodiment.
A railway vehicle 1 of this embodiment includes a vehicle body 2, two bogies 3, and a power conversion system 10 that converts power from the outside.

The vehicle body 2 is formed in a rectangular parallelepiped shape elongated in the assumed running direction of the railroad vehicle 1 . A space capable of accommodating passengers is formed inside the vehicle body 2 . A current collector 400 projects upward from the ceiling of the vehicle body 2 . The current collector 400 is configured to be contactable with overhead wires.

The trucks 3 are attached to the underfloor of the vehicle body 2 via truck springs such as air springs. A pair of axles 11 extending in the width direction (the direction substantially orthogonal to the assumed traveling direction and the vertical direction) is rotatably supported by the truck 3 . Wheels 12 are attached to these axles 11 (one wheel 12 is not shown).

Each of the trucks 3 is equipped with a main electric motor M for rotating each axle 11 . That is, the railway vehicle 1 is equipped with four running motors M (running motors M1 to M4 shown in FIG. 2).
The power conversion system 10 is mounted, for example, in a portion located between the pair of trucks 3 under the floor of the vehicle body 2 .

Drawing 2 is a figure showing roughly one example of composition of a power conversion system of an embodiment.
The power conversion system 10 of the present embodiment utilizes high-voltage AC power supplied from overhead lines to provide a predetermined of power can be supplied.

In the embodiment, the running motors M1 to M4 are, for example, induction motors.
In the embodiment, the AC load LAC is a load of the railway vehicle 1 excluding the traction motors M1 to M4, and is, for example, an electronic device that operates with an AC voltage of 100 volts.
Further, in the embodiment, the DC load LDC is a load of the railway vehicle other than the running motors M1 to M4, and is, for example, an electronic device or a battery that operates on a DC voltage.

The power conversion system 10 of the present embodiment includes, for example, a power conversion device 100 for auxiliary power, a battery device 200, and a power conversion device 300 for traveling.

Power converter 300 for running is supplied with high-voltage AC power from overhead wires via current collector 400 and windings for running (primary winding 500 and secondary winding 302) of the main transformer.

Power converter 300 for traveling converts the high-voltage AC power stepped down by the transformer into AC power for traveling and supplies it to motors M1 to M4 for traveling. As a result, power converter 300 for running generates running torque in motors M1 to M4 for running, and runs the railway vehicle.

The power conversion device for running 300 includes, for example, a contactor 312, a resistor 314, an AC-DC power converter for running 320, a DC-AC power converter for running 330, capacitors C1 and C2, and running power. It includes a control unit 310, a first terminal T31, and a second terminal T32.

Contactor 312 is connected to the positive line and is connected in parallel with resistor 314 . Power conversion device 300 for running also includes a coil (not shown) for electromagnetically operating contactor 312 and the like.

The charging circuit for running switches the contactor 312 between the disconnected state and the conducting state under the control of the running power control unit 310 . When the supply of high voltage AC power is started, the contactor 312 is in a blocking state and then switched to a conducting state.

Traveling AC-DC power conversion unit 320 includes a switching circuit (not shown) including a plurality of switching elements connected between a high-potential power line and a low-potential power line to which high-voltage AC power is supplied. Running AC-DC power conversion unit 320 is also called a converter. Note that AC-DC power conversion unit 320 for running may be any one of a boost converter, a step-down converter, and a step-up/step-down converter. A switching element included in the switching circuit is, for example, an IGBT (insulated gate bipolar transistor), but is not limited to this, and other types of switching elements may be used.

Traveling AC-DC power conversion unit 320 can convert the supplied high-voltage AC power into DC power by switching the switching element between a conducting state and a blocking state in accordance with control by traveling power control unit 310. can.

Driving AC-DC power conversion unit 320 and driving DC-AC power conversion unit 330 are electrically connected by a high-potential power line and a low-potential power line. The power line on the high potential side is electrically connected to the first terminal T21 of the battery device 200 via the first terminal T31. The power line on the low potential side is electrically connected to the second terminal T22 of the battery device 200 via the second terminal T32.
In addition, traveling AC-DC power converting section 320 and traveling DC-AC power converting section 330 have a common ground line. The ground wire is grounded via the third terminal T33.

The capacitor C1 is connected between the power line on the high potential side and the ground line.
The capacitor C2 is connected between the ground line and the power line on the low potential side.
That is, capacitors C1 and C2 are connected to the DC input terminal of DC-AC power conversion section 330 for running.

Driving DC-AC power conversion unit 330 includes a switching circuit (not shown) including a plurality of switching elements bridge-connected between the high-potential power line and the low-potential power line. Note that running DC-AC power conversion unit 330 is also called an inverter. Traveling DC-AC power conversion section 330 includes three sets of switching elements on the upper bridge side and switching elements on the lower bridge side corresponding to the three phases of motors M1 to M4 for traveling. Each switching element is, for example, an IGBT, but is not limited to this, and other types of switching elements may be used.

Running DC-AC power conversion section 330 converts DC power to running AC power by switching the switching elements of each phase in running motor M between a conductive state and a cut-off state under the control of running power control section 310. Convert to electricity.

The running power control unit 310 is implemented by executing a program stored in a program memory by a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). Some or all of these functional units may be realized by hardware such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), or FPGA (Field-Programmable Gate Array). The running power control unit 310 can operate with, for example, the 100V operating power converted by the auxiliary power converter 100 .
Running power control unit 310 controls contactor 312 , running AC-DC power converting unit 320 , and running DC-AC power converting unit 330 .

Auxiliary power converter 100 is supplied with high-voltage AC power from overhead lines via current collector 400 and load windings (primary winding 500 and tertiary winding 102) of the main transformer. The AC power supplied from the load windings (primary winding 500 and tertiary winding 102) of the main transformer is the AC power supplied from the running windings (primary winding 500 and secondary winding 302) of the main transformer. The voltage is lower than the power.

The power converter 100 for auxiliary power supply converts the low-voltage AC power obtained by stepping down the high-voltage AC power with a transformer into AC power for load, and supplies the AC power to the AC load LAC. That is, the auxiliary power converter 100 drives the AC load LAC with the load AC power.

In addition, the auxiliary power conversion device 100 converts the low-voltage AC power obtained by stepping down the high-voltage AC power using a transformer into DC power for load, and supplies the DC power to the DC load LDC. That is, the auxiliary power converter 100 drives the DC load LDC with the load DC power.

Further, the auxiliary power conversion device 100 can convert high-voltage AC power into predetermined DC power and supply it to the battery device 200 . That is, the auxiliary power conversion device 100 can supply charging power for the battery device 200 .

The auxiliary power converter 100 includes, for example, a load AC-DC power converter 110, a load DC-AC power converter 120, an AC load DC-AC power converter 130, a chopper circuit 150, First terminal T11, second terminal T12, capacitor C3, load transformer (primary winding 122, secondary winding 124, and tertiary winding 140), external power supply connection detector 160, and load power and a control unit 170 .

The load AC-DC power converter 110 converts low-voltage AC power supplied from the current collector 400 through the load windings (the primary winding 500 and the tertiary winding 102) of the main transformer into DC power.

The load AC-DC power converter 110 includes, for example, a switching circuit (not shown) having a plurality of switching elements connected between a high-potential power line and a low-potential power line. The plurality of switching elements are, for example, IGBTs (insulated gate bipolar transistors) containing diodes connected in anti-parallel, but may be other types of switching elements.
Note that the load AC-DC power conversion unit 110 may include, for example, any one of a boost converter, a step-down converter, and a step-up/step-down converter.

Chopper circuit 150 is electrically connected to fifth terminal T25 and sixth terminal T26 of battery device 200 via first terminal T11 and second terminal T12, and output from AC-DC power converter 110 for load. The DC power is converted into a predetermined voltage and supplied to the battery device 200 . The chopper circuit 150 converts the DC power supplied from the battery device 200 into a predetermined voltage and supplies it to the DC side of the AC-DC power conversion section 110 for load.

The load DC-AC power conversion unit 120 includes a switching circuit (not shown) including a plurality of switching elements bridge-connected between the high-potential power line and the low-potential power line.

Note that the load DC-AC power conversion unit 120 is also called an inverter. Each switching element is, for example, an IGBT (insulated gate bipolar transistor). Note that other types of switching elements may be used as the switching elements. Load DC-AC power conversion section 120 converts DC power into load AC power by arbitrarily switching a switching element between a conductive state and a cut-off state under the control of load power control section 170 .

On the load AC-DC power conversion unit 110 side of the load DC-AC power conversion unit 120, a capacitor C3 is provided in parallel with the load AC-DC power conversion unit 110 and the load DC-AC power conversion unit 120. It is connected. That is, the capacitor C3 is connected to the DC input terminal of the load DC-AC power conversion section 120 .

Capacitor C3 is set to have a capacity capable of supplying stable power to AC load LAC and DC load LDC in load DC-AC power conversion section 120 . That is, the capacitance of the capacitor C3 is set to the value of the AC load LAC and the DC load LDC when the railway vehicle is running in a non-powered section (also referred to as a section) where the AC power supplied from the current collector 400 is stopped or during a power failure. It does not have to be of such a high capacity as to compensate for the supply of AC power for the load.

The load AC power converted by the load DC-AC power converter 120 is supplied to the DC load LDC via the primary winding 122, the tertiary winding 140 and the rectifier of the load transformer.
The load AC power converted by the load DC-AC power converter 120 passes through the load transformer primary winding 122, secondary winding 124, rectifier, and AC load DC-AC power converter 130. is supplied to the AC load LAC through the

The AC load DC-AC power conversion unit 130 includes a plurality of switching elements bridge-connected between the high-potential side power line and the low-potential side power line, similar to the above-described load DC-AC power conversion unit 120. A switching circuit (not shown) is provided. The AC load DC-AC power converter 130 converts DC power into AC power by switching the switching element between a conductive state and a disconnected state.

The external power supply 700 is, for example, a 440V AC power supply, and is electrically connected to the terminals T13 and T14 of the auxiliary power converter 100 to which the transformer is connected. Therefore, the AC power supplied from the external power supply 700 is supplied to the load AC-DC power conversion unit 110, and is supplied to the DC load LDC, the AC load LAC, and the battery device 200 in the same manner as the AC power from the transformer. can be supplied.

The external power supply connection detection unit 160 includes a coil through which a current flows when the external power supply 700 is connected, a switching element that closes a path (makes it conductive) by a magnetic force generated by the current flowing through the coil, and a relay circuit. a detector for detecting when the path is closed by the switching element of the relay circuit. Note that the detector may be included in the load power control section 170 .

The load power control unit 170 is implemented by executing a program stored in a program memory by a processor such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit). Some or all of these functional units may be realized by hardware such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), or FPGA (Field-Programmable Gate Array). The load power control unit 170 is configured to be operable by being supplied with, for example, the 100V operating power converted by the auxiliary power converter 100 .

Load power control unit 170 controls load AC-DC power conversion unit 110 , load DC-AC power conversion unit 120 , AC load DC-AC power conversion unit 130 , and chopper circuit 150 .

The battery device 200 has a first terminal T21 to a sixth terminal T26.
First terminal T21 and second terminal T22 are electrically connected to power conversion device 300 for running. Third terminal T23 and fourth terminal T24 are electrically connected to accessory group 600 . The fifth terminal T25 and the sixth terminal T26 are electrically connected to the auxiliary power conversion device 100 .

The battery device 200 is, for example, a low-voltage battery with an insulation section. The battery device 200 includes, for example, an assembled battery BT in which storage battery cells such as lithium ion batteries are connected in series or in parallel, a plurality of contactors BLB1, BLB2, BatDK1, BatDK2, BatCK1, BatCK2, and CHK, and a resistor CHRe. , and a battery control unit 210 that controls the operation of a plurality of contactors BLB1, BLB2, BatDK1, BatDK2, BatCK1, BatCK2, and CHK.

The contactor BLB1 switches electrical connection between the positive terminal of the assembled battery BT and the positive side main circuit. The contactor BLB2 switches electrical connection between the negative terminal of the assembled battery BT and the negative main circuit. That is, the contactor BLB1 and the contactor BLB2 are contactors (fourth contactor) that switch the electrical connection state between the assembled battery BT and the first power line (main circuit).

The contactor BatDK1 switches electrical connection between the positive side main circuit and the first terminal T21. The contactor BatDK2 switches electrical connection between the negative side main circuit and the second terminal T22. That is, the contactor BatDK1 and the contactor BatDK2 are contactors (second contactors) that switch the electrical connection state of the power line that supplies power from the assembled battery BT to the running DC-AC power converter 330 .

The contactor BatCK1 switches electrical connection between the positive side main circuit and the fifth terminal T25. The contactor BatCK2 switches electrical connection between the negative main circuit and the sixth terminal T26. That is, the contactor BatCK1 and the contactor BatCK2 are contactors (third contactors) that switch the electrical connection state of the power line that supplies power from the assembled battery BT to the DC-AC power conversion unit 120 for load.

Contactor CHK and resistor CHRe are connected in parallel. The contactor (first contactor) CHK connects the positive main circuit (positive side main circuit) extending between the positive terminal of the assembled battery BT, the first terminal T21, the third terminal T23, and the fifth terminal T25. 1 power line) is switched between a second power line connected through a resistor CHRe connected in parallel with the first power line and a path (first power line) connected without the resistor CHRe.

A power line that supplies power from the assembled battery BT to the auxiliary machine group 600 branches from the main circuit (power line) between the contactors BatCK1 (third contactor) and the contactors BLB1 and BLB2 (fourth contactor). are doing.

Note that the battery control unit 210 is implemented by executing a program stored in a program memory by a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). Some or all of these functional units may be realized by hardware such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), or FPGA (Field-Programmable Gate Array). The battery control unit 210 is configured to be operable by being supplied with operating power obtained by converting the discharged power from the assembled battery BT into a predetermined value, for example.

The battery control unit 210 periodically acquires and monitors the current flowing through the assembled battery BT, the voltage of the storage battery cells, and the temperature of the storage battery cells, and calculates, for example, the SOC (state of charge) of the assembled battery BT. It controls charging and discharging of the battery device 200 .

Auxiliary machine group 600 is electrically connected to third terminal T23 and fourth terminal T24 of battery device 200 .
Auxiliary machine group 600 is supplied with DC power from battery device 200 . Auxiliary equipment group 600 may be supplied with DC power discharged from assembled battery BT of battery device 200, but is not limited to this, and is supplied with DC power converted by load AC-DC power conversion unit 110. may be Further, auxiliary equipment group 600 may be supplied with electric power obtained by synthesizing the DC power discharged from assembled battery BT of battery device 200 and the DC power converted by load AC-DC power conversion section 110 .

The auxiliary machine group 600 includes, for example, a compressor 640 and blower motors 620 and 630 mounted on a railroad vehicle.
The blower motors 620 and 630 are blower motors for cooling the running motors M1 to M4 mounted on the bogie 3 of the railroad vehicle, and include an inverter and a capacitor (third capacitor) C4 connected to the DC input end of the inverter. C5 and. The inverter is, for example, a power conversion device for auxiliary equipment that converts power supplied from the battery device 200 into three-phase AC power and supplies the same to a load.

Compressor 640 is a brake compressor, and includes an inverter and a capacitor (third capacitor) C6 connected to the DC input terminal of the inverter. The inverter is, for example, a power conversion device for auxiliary equipment that converts power supplied from the battery device 200 into three-phase AC power and supplies the same to a load.

In the power conversion system described above, the battery device 200 can function as a power supply for the auxiliary machine group 600 .
For example, when the contactors BLB1, BLB2, and CHK are in a closed state (conducting state) and the contactors BatDK1, BatDK2, BatCK1, and BatCK2 are in an open state (interrupting state), the positive terminal of the assembled battery BT is connected to the third terminal. It is electrically connected to the terminal T23, and the negative terminal is electrically connected to the fourth terminal T24. Thereby, battery device 200 can supply DC power to auxiliary machine group 600 connected to third terminal T23 and fourth terminal T24.

Moreover, the battery device 200 can function as a power source for the DC load LDC and the AC load LAC.
For example, when the contactors BLB1, BLB2, BatCK1, BatCK2 and CHK are closed (conducting state) and the contactors BatDK1 and BatDK2 are open (interrupting state), the positive terminal of the assembled battery BT is connected to the fifth terminal. It is electrically connected to the terminal T25, and the negative terminal is electrically connected to the sixth terminal T26. That is, the battery device 200 can supply DC power to the chopper circuit 150 of the auxiliary power conversion device 100 via the fifth terminal T25 and the sixth terminal T26. Chopper circuit 150 converts the voltage of the DC power supplied from battery device 200 to a predetermined value, and supplies the DC power to load DC-AC power converter 120 . As a result, the DC power output from battery device 200 is converted, and power can be supplied to DC load LDC and AC load LAC.

In addition, battery device 200 can function as a power supply for driving motors M1 to M4.
For example, when the contactors BLB1, BLB2, BatDK1, BatDK2, and CHK are closed (conducting state) and the contactors BatCK1 and BatCK2 are open (interrupting state), the positive terminal of the assembled battery BT is connected to the first terminal. The terminal T21 is electrically connected to the first terminal T31 of the running power converter 300, and the negative terminal is electrically connected to the second terminal T32 of the running power converter 300 through the second terminal T22. be. That is, the battery device 200 can supply DC power to the driving DC-AC power conversion section 330 of the driving power conversion device 300 via the first terminal T21 and the second terminal T22. As a result, the DC power output from the battery device 200 is converted, and power can be supplied to the driving motors M1 to M4.

As described above, the battery device 200 operates in such a manner that the running DC-AC power conversion unit 330, the load DC-AC Power conversion unit 120 and auxiliary machine group 600 can be supplied with discharged power of assembled battery BT.

Next, an example of the operation when the external power supply 700 is connected in the power conversion system will be described.
When the external power supply 700 is electrically connected to the terminals T13 and T14 of the auxiliary power conversion device 100, the external power supply connection detection unit 160 detects that the external power supply 700 is connected.

For example, when charging the battery device 200 with power supplied from the external power supply 700, the battery control unit 210 of the battery device 200 closes the contactors BatCK1, BatCK2, BLB1, and BLB2, and closes the contactors BatDK1 and BatDK2. Leave it open.

In addition, the battery control unit 210 opens the contactor CHK when, for example, the voltage of the assembled battery BT becomes equal to or higher than a predetermined threshold value (or when a predetermined time has elapsed) after the start of charging, the contactor CHK is opened. Keep it closed. If the chopper circuit 150 can control the voltage of the charging power in accordance with the voltage of the assembled battery BT, the contactor CHK may be closed from the start of charging.

The load power control unit 170 of the auxiliary power converter 100 operates the load AC-DC power converter 110 and the chopper circuit 150 .
Load AC-DC power converter 110 converts AC power supplied from external power supply 700 into DC power, and outputs the DC power to chopper circuit 150 .
Chopper circuit 150 converts the voltage of the DC power output from load AC-DC power converter 110 into a predetermined value and outputs the voltage to battery device 200 .

At this time, if auxiliary machine group 600 is in a state of being connected to battery device 200 , the DC power output from chopper circuit 150 is supplied to both assembled battery BT and auxiliary machine group 600 . For example, when it is desired to shorten the time required for charging the assembled battery BT or when the capacity of the external power supply 700 is limited, the auxiliary machine group 600 is electrically disconnected from the battery device 200, and DC power is supplied only to the assembled battery BT. can be supplied.

Further, for example, when charging the DC load LDC with power supplied from the external power supply 700, the battery control unit 210 of the battery device 200 opens the contactors BatCK1 and BatCK2, and the battery device 200 and the power converter for the auxiliary power supply. It electrically disconnects from the device 100 .

The load power control unit 170 of the auxiliary power converter 100 operates the load AC-DC power conversion unit 110 and the load DC-AC power conversion unit 120 .
Load AC-DC power conversion section 110 converts AC power supplied from external power supply 700 into DC power, and outputs the DC power to load DC-AC power conversion section 120 .

The load DC-AC power conversion unit 120 converts the DC power output from the load AC-DC power conversion unit 110 into AC power, and the primary winding 122, the tertiary winding 140, and the rectifier of the load transformer. output to the DC load LDC.
At this time, since it is not necessary to supply power to the AC load LAC, the AC load LAC may be electrically disconnected from the auxiliary power converter 100 .

It is also possible to combine the above operations and charge both the battery device 200 and the DC load LDC with power supplied from the external power supply 700 .
For example, when the capacity of the external power supply 700 is limited or when it is desired to shorten the charging time, it may be possible to select to charge only the DC load LDC based on a command from the driver's cab, and only the battery device 200. may be selectable to charge the

Further, depending on the situation, the electric power supplied from the external power supply 700 may be supplied to the traveling power conversion device 300, the AC load LAC, and the auxiliary machine group 600. FIG.

As described above, according to the present embodiment, it is possible to provide a power conversion system that can use power supplied from an external power source other than an overhead wire.
FIG. 3 is a diagram schematically showing another configuration example of the power conversion system of the embodiment.
The power conversion system 10 shown in FIG. 3 differs from the configuration shown in FIG. 2 in the configuration of the battery device 200 .
In the battery device 200 shown in FIG. 3, the contactor CHK and the resistor CHRe are connected in series in the path connected in parallel with the contactor BLB1. That is, between the positive terminal of the assembled battery BT and the first terminal T21, between the positive terminal of the assembled battery BT and the third terminal T23, and between the positive terminal of the assembled battery BT and the fifth terminal T25 , are provided with a path (first power line) connected via the contactor BLB1 and a path (second power line) connected via the contactor CHK and the resistor CHRe. The contactor CHK and the contactor BLB1 can switch the power supply path between the first power line and the second power line.
Except for the configuration of the battery device 200, the power conversion system 10 shown in FIG. 3 has the same configuration as the power conversion system 10 shown in FIG.

In power conversion system 10 shown in FIG. 3 , battery device 200 can function as a power supply for auxiliary machine group 600 .
For example, when the contactors BLB1 and BLB2 are in a closed state (conducting state) and the contactors BatDK1, BatDK2, BatCK1, BatCK2 and CHK are in an open state (interrupting state), the positive terminal of the assembled battery BT is connected to the third terminal. It is electrically connected to the terminal T23, and the negative terminal is electrically connected to the fourth terminal T24. Thereby, battery device 200 can supply DC power to auxiliary machine group 600 connected to third terminal T23 and fourth terminal T24.

Moreover, the battery device 200 can function as a power source for the DC load LDC and the AC load LAC.
For example, when the contactors BLB1, BLB2, BatCK1, and BatCK2 are in a closed state (conduction state) and the contactors BatDK1, BatDK2, and CHK are in an open state (interruption state), the positive terminal of the assembled battery BT is connected to the fifth terminal. It is electrically connected to the terminal T25, and the negative terminal is electrically connected to the sixth terminal T26. That is, the battery device 200 can supply DC power to the chopper circuit 150 of the auxiliary power conversion device 100 via the fifth terminal T25 and the sixth terminal T26. Chopper circuit 150 converts the voltage of the DC power supplied from battery device 200 to a predetermined value, and supplies the DC power to load DC-AC power converter 120 . As a result, the DC power output from battery device 200 is converted, and power can be supplied to DC load LDC and AC load LAC.

In addition, battery device 200 can function as a power supply for driving motors M1 to M4.
For example, when the contactors BLB1, BLB2, BatDK1, and BatDK2 are in a closed state (conduction state) and the contactors BatCK1, BatCK2, and CHK are in an open state (interruption state), the positive terminal of the assembled battery BT is connected to the first terminal. The terminal T21 is electrically connected to the first terminal T31 of the running power converter 300, and the negative terminal is electrically connected to the second terminal T32 of the running power converter 300 through the second terminal T22. be. That is, the battery device 200 can supply DC power to the driving DC-AC power conversion section 330 of the driving power conversion device 300 via the first terminal T21 and the second terminal T22. As a result, the DC power output from the battery device 200 is converted, and power can be supplied to the driving motors M1 to M4.

As described above, the battery device 200 operates in such a manner that the running DC-AC power conversion unit 330, the load DC-AC Power conversion unit 120 and auxiliary machine group 600 can be supplied with discharged power of assembled battery BT.

Battery device 200 can function, for example, as a power supply for both driving motors M1-M4 and auxiliary machine group 600. FIG.
For example, when the railway vehicle is in emergency running due to a power outage or the like, the battery device 200 can supply electric power to the driving motors M1 to M4 and the auxiliary machine group 600 to move the railway vehicle to a safe place. can.

Next, an example of the operation when the external power supply 700 is connected in the power conversion system will be described.
When the external power supply 700 is electrically connected to the terminals T13 and T14 of the auxiliary power conversion device 100, the external power supply connection detection unit 160 detects that the external power supply 700 is connected.

For example, when charging the battery device 200 with power supplied from the external power supply 700, the battery control unit 210 of the battery device 200 closes the contactors BatCK1, BatCK2, BLB1, and BLB2, and closes the contactors BatDK1 and BatDK2. Leave it open.

Further, the battery control unit 210 closes the contactor CHK and opens the contactor BLB1, and for example, when the voltage of the assembled battery BT becomes equal to or higher than a predetermined threshold after the start of charging (or for a predetermined period of time). , the contactor BLB1 may be closed and the contactor CHK may be opened. If the chopper circuit 150 can control the voltage of the charging power in accordance with the voltage of the assembled battery BT, the contactor BLB1 may be closed from the start of charging.

The load power control unit 170 of the auxiliary power converter 100 operates the load AC-DC power converter 110 and the chopper circuit 150 .
Load AC-DC power converter 110 converts AC power supplied from external power supply 700 into DC power, and outputs the DC power to chopper circuit 150 .
Chopper circuit 150 converts the voltage of the DC power output from load AC-DC power converter 110 into a predetermined value and outputs the voltage to battery device 200 .

At this time, if auxiliary machine group 600 is in a state of being connected to battery device 200 , the DC power output from chopper circuit 150 is supplied to both assembled battery BT and auxiliary machine group 600 . For example, when it is desired to shorten the time required for charging the assembled battery BT or when the capacity of the external power supply 700 is limited, the auxiliary machine group 600 is electrically disconnected from the battery device 200, and DC power is supplied only to the assembled battery BT. can be supplied.

Further, for example, when charging the DC load LDC with power supplied from the external power supply 700, the battery control unit 210 of the battery device 200 opens the contactors BatCK1 and BatCK2, and the battery device 200 and the power converter for the auxiliary power supply. It electrically disconnects from the device 100 .

The load power control unit 170 of the auxiliary power converter 100 operates the load AC-DC power conversion unit 110 and the load DC-AC power conversion unit 120 .
Load AC-DC power conversion section 110 converts AC power supplied from external power supply 700 into DC power, and outputs the DC power to load DC-AC power conversion section 120 .

The load DC-AC power conversion unit 120 converts the DC power output from the load AC-DC power conversion unit 110 into AC power, and the primary winding 122, the tertiary winding 140, and the rectifier of the load transformer. output to the DC load LDC.
At this time, since it is not necessary to supply power to the AC load LAC, the AC load LAC may be electrically disconnected from the auxiliary power converter 100 .

It is also possible to combine the above operations and charge both the battery device 200 and the DC load LDC with power supplied from the external power supply 700 .
For example, when the capacity of the external power supply 700 is limited or when it is desired to shorten the charging time, it may be possible to select to charge only the DC load LDC based on a command from the driver's cab, and only the battery device 200. may be selectable to charge the

Further, depending on the situation, the electric power supplied from the external power supply 700 may be supplied to the traveling power conversion device 300, the AC load LAC, and the auxiliary machine group 600. FIG.

As described above, according to the present embodiment, it is possible to provide a power conversion system that can use power supplied from an external power source other than an overhead wire.

Further, by connecting the battery device 200 between the load AC-DC power conversion unit 110 and the AC load DC-AC power conversion unit 120, and connecting the auxiliary machine group 600 to the battery device 200, the battery device 200 can function as a power supply for the auxiliary machine group 600 . Therefore, according to the power conversion system 10, power is supplied from the battery device 200 to the auxiliary machine group 600 even if power is not supplied from the current collector 400 when the railway vehicle is running in a non-powered section or during a power failure. can continue to supply As a result, according to power conversion system 10, it is possible to suppress a decrease in power supplied to auxiliary machine group 600. FIG.

Furthermore, according to the power conversion system 10, by connecting the battery device 200 between the load AC-DC power conversion unit 110 and the load DC-AC power conversion unit 120, the load winding of the main transformer When the power supplied to the load AC-DC power conversion unit 110 decreases, the battery device 200 discharges the power corresponding to the power decrease from the battery device 200 to the load DC-AC power conversion unit 120. Discharge power can be supplied. As a result, according to the power conversion system 10, it is possible to suppress a decrease in power supplied to the AC load LAC and the DC load LDC of the railway vehicle.

Further, according to the power conversion system 10, since the load AC-DC power conversion unit 110 includes a switching circuit including a plurality of switching elements, the DC power output from the load AC-DC power conversion unit 110 is stabilized. can be made That is, according to the load AC-DC power conversion section 110, it is possible to convert the power into DC power with less change over time than a rectifier using diodes. As a result, according to the power conversion system 10, when the DC power from the load AC-DC power converter 110 to the load DC-AC power converter 120 decreases, the load DC-AC power from the battery device 200 is reduced. Discharge power can be quickly supplied to the conversion unit 120 .

Furthermore, according to the power conversion system 10, since the discharged power can be supplied from the battery device 200, the capacity of the capacitor C3 is supplied to the AC load LAC and the DC load LDC when the railway vehicle passes through the no-power section. There is no need to increase the capacity in consideration of the capacity for power compensation.

Furthermore, according to the power conversion system 10, the DC power output from the load AC-DC power conversion unit 110 is stabilized by being controlled by the chopper circuit 150, and is output from the load AC-DC power conversion unit 110. By supplying the increased power to the battery device 200 , the battery device 200 can be charged without imposing a large load on the charging resistor in the battery device 200 .

Furthermore, according to the power conversion system 10, in an emergency, the battery device 200 can be discharged and DC power can be supplied to the DC-AC power conversion unit 330 for running. As a result, according to the power conversion system 10, in an emergency, the electric power discharged from the battery device 200 is used to drive the running motors M1 to M4, thereby allowing the railway vehicle to run.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

M1 to M4... Running motor, C1-C6... Capacitor, CHK... First contactor, CHRe... Resistor, 100... Power conversion device for auxiliary power supply, 102, 302, 500... Main transformer, 110... AC for load - DC power converter 120 Load DC-AC power converter 130 AC load DC-AC power converter 150 Chopper circuit 160 External power supply connection detector 200 Battery device BT Assembled battery , 300... power conversion device for running, 320... AC-DC power conversion unit for running, 330... DC-AC power conversion unit for running, 400... power collector, 600... auxiliary machine group, 700... external power supply.

Claims (2)

a transformer for stepping down power from overhead lines;
an AC-DC power converter for running that converts and outputs AC power supplied through the secondary winding of the transformer; and a DC power for running that is output from the AC-DC power converter for running. a running power conversion device comprising a running DC-AC power converter that converts power to drive a motor;
A load AC-DC power converter for converting AC power supplied through the tertiary winding of the transformer into DC power, and a DC power converted by the load AC-DC power converter into AC power. Auxiliary power supply power converter comprising: a load DC-AC power conversion section for converting and outputting; and a DC load supplied with the power output from the load DC-AC power conversion section via a transformer and a rectifier. a device;
A power line connecting the load AC-DC power conversion unit and the load DC-AC power conversion unit, and a power line connecting the running AC-DC power conversion unit and the running DC-AC power conversion unit a battery device connected to a power line;
an auxiliary machine connected to a power line connecting the auxiliary power converter and the battery device and operable by power supplied from the battery device,
The power conversion device for auxiliary power supply includes an external power supply connection detection unit that detects that an external power supply is connected, and a power line that connects the AC-DC power conversion unit for load and the DC-AC power conversion unit for load. A chopper circuit that converts the voltage of DC power obtained from to a predetermined value and outputs it to the battery device, and when the connection of the external power supply is detected by the external power supply connection detection unit, the load AC-DC A power conversion system comprising: a power conversion section; and a load power control section that operates the chopper circuit and controls the battery device to be charged with power supplied from the external power supply. When the external power supply is connected, the load power control unit operates the load AC-DC power conversion unit and the load DC-AC power conversion unit to generate power supplied from the external power supply. 2. The power conversion system according to claim 1, wherein said DC load can be charged by said DC load.

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