WO2017104204A1

WO2017104204A1 - Vehicle

Info

Publication number: WO2017104204A1
Application number: PCT/JP2016/077747
Authority: WO
Inventors: 梨瑛子桑原; 敦美近藤; 加藤　仁; 真木　康臣; 宮崎　玲
Original assignee: 株式会社東芝
Priority date: 2015-12-18
Filing date: 2016-09-20
Publication date: 2017-06-22
Also published as: JP2017112795A

Abstract

A vehicle according to an embodiment is equipped with a converter, an inverter, a pair of DC links, multiple storage cell modules, a step-down chopper, and a switching circuit unit. The converter is configured so as to be capable of converting single-phase AC power to DC power. The inverter is configured so as to be capable of converting DC power to three-phase AC power. The pair of DC links connect the converter and the inverter. The multiple storage cell modules are electrically connected to the pair of DC links. The step-down chopper is configured so as to be capable of stepping down DC power output from the positive-side DC link to the positive side of the multiple storage cell modules. The switching circuit unit switches the electrical connection relationship of the multiple storage cell modules between a series connection and a parallel connection, and switches the electrical connection relationship of the pair of DC links, the multiple storage cell modules, and the step-down chopper, for an AC power supply section, a DC power supply section, and a non-power-supply section.

Description

vehicle

Embodiments of the present invention relate to a vehicle.

Conventionally, a vehicle including a main circuit system including an inverter and a converter for driving a main motor and the like and a storage battery system on which a storage battery module is mounted is known.

JP 2001-69672 A

Generally, the main circuit system and the storage battery system are installed in a limited equipment space located on or under the floor of the vehicle. Conventionally, it has been desired to increase the number of storage battery modules installed in a limited outfitting space as much as possible to increase the capacity.

The vehicle according to the embodiment includes a converter, an inverter, a pair of DC links, a plurality of storage battery modules, a step-down chopper, and a switching circuit unit. The converter is configured to convert single-phase AC power into DC power. The inverter is configured to be able to convert DC power into three-phase AC power. The pair of DC links connect the DC input / output side of the converter and the DC input / output side of the inverter. The plurality of storage battery modules are electrically connected to a pair of DC links. The step-down chopper is provided between the positive DC link of the pair of DC links and the positive side of the plurality of storage battery modules, and generates DC power output from the positive DC link to the positive side of the plurality of storage battery modules. It is configured to be able to step down. The switching circuit section includes a plurality of AC power supply sections that receive supply of single-phase AC power from the AC system, DC power supply sections that receive DC power supply from the DC system, and no power supply sections that do not receive power supply from the outside. The electrical connection relationship of the storage battery modules is switched in series or in parallel, and the electrical connection relationship between the pair of DC links, the plurality of storage battery modules, and the step-down chopper is switched.

FIG. 1 is an exemplary diagram illustrating a schematic configuration of a vehicle according to an embodiment. FIG. 2 is an exemplary diagram illustrating an internal configuration of the storage battery box according to the embodiment. FIG. 3 is an exemplary diagram showing an electrical connection relationship of each part of the vehicle when the vehicle according to the embodiment travels in the AC power feeding section. FIG. 4 is an exemplary diagram illustrating an electrical connection relationship of each part of the vehicle when the vehicle according to the embodiment travels in the DC power feeding section. FIG. 5 is an exemplary diagram showing an electrical connection relationship of each part of the vehicle when the vehicle according to the embodiment travels in a non-powered section.

Hereinafter, embodiments will be described with reference to the drawings. The technology of the embodiment travels in an AC power supply section that receives supply of single-phase AC power from an AC system, a DC power supply section that receives supply of DC power from a DC system, and a non-powered section that does not receive power supply from the outside. Applies to possible vehicles. Such a vehicle includes a storage battery system equipped with a storage battery module that is charged while traveling in an AC power feeding section and a DC power feeding section and discharged while traveling in a non-powered section, and single-phase AC power from the AC system, DC system And a main circuit system for driving a main motor or the like based on DC power from the battery or DC power generated by discharging the storage battery module. The main circuit system and the storage battery system are each installed as a box-shaped structure in a limited equipment space located on or under the floor of the vehicle.

In a conventional vehicle having the above-described configuration, in order to normally charge and discharge the storage battery module, a voltage adjustment between the main circuit system and the storage battery system, such as a step-up chopper and a step-down chopper, is performed. It was necessary to provide a circuit. For example, in a DC power supply section, a step-down chopper for stepping down relatively large DC power supplied from a DC system is required for charging the storage battery module. In a non-power supply section, a DC voltage due to discharge of the storage battery module is mainly used. A step-up chopper for boosting the operation of the circuit system is required. However, since the step-up chopper and the step-down chopper are relatively large structures, if both the step-up chopper and the step-down chopper are installed in the outfitting space, it is difficult to increase the number of storage battery modules installed in the outfitting space.

Therefore, in the embodiment, with the configuration described below, it is possible to omit the step-up chopper and install a large number of storage battery modules in a limited equipment space.

FIG. 1 is an exemplary diagram showing a schematic configuration of a vehicle 100 according to the embodiment. As shown in FIG. 1, the vehicle 100 includes a main circuit system 10 and a storage battery system 20. The main circuit system 10 operates by receiving supply of AC power or DC power. The storage battery system 20 is electrically connected to the main circuit system 10. The main circuit system 10 and the storage battery system 20 are installed in an outfitting space located on or under the floor of the vehicle 100.

The main circuit system 10 includes an AC power supply device 11, a circuit breaker 12, a main transformer 13, a converter 14, an inverter 15, a p-side link 16 a, an n-side link 16 b, and a DC power supply device 17. . The p-side link 16a and the n-side link 16b are examples of “DC link”.

AC power supply device 11 is configured to be connectable to AC overhead line 200 as an example of an AC system. The circuit breaker 12 is provided between the AC power supply device 11 and the main transformer 13. The circuit breaker 12 connects the AC overhead line 200 and the main circuit system 10 in order to prevent the overcurrent from flowing into the main circuit system 10 when an abnormality such as an accident that causes the overcurrent occurs. Cut off.

The main transformer 13 transforms (steps down) the AC power supplied from the AC overhead line 200 for the vehicle 100 and outputs the AC power after the transformation to the converter 14. The negative potential point of the main transformer 13 is grounded to the rail 400 via the wheel 30.

When the AC power (single phase) is input from the main transformer 13, the converter 14 converts the AC power into DC power, and outputs the converted DC power to the p-side link 16a and the n-side link 16b. . The p-side link 16 a and the n-side link 16 b are provided so as to connect the output side of the converter 14 and the input side of the inverter 15. When DC power is input via the p-side link 16a and the n-side link 16b, the inverter 15 converts the DC power into AC power (three-phase) and outputs the converted AC power to the main motor 18. To do.

The DC power supply device 17 is configured to be connectable to a DC overhead line 300 as an example of a DC system. The DC power supply device 17 is connected to a contact P1 on the p-side link 16a and a contact p2 on the n-side link 16b. When connected to the DC overhead line 300, the DC power supply device 17 rectifies the DC power from the DC overhead line 300, and outputs the rectified DC power to the p-side link 16a and the n-side link 16b.

The storage battery system 20 includes a plurality of storage battery boxes 21. Although FIG. 1 illustrates a configuration in which the number of storage battery boxes 21 is two, the number of storage battery boxes 21 may be three or more. Each of the plurality of storage battery boxes 21 includes a storage battery module 22 that can be charged and discharged.

Incidentally, in the configuration as described above, it is necessary to adjust the voltage between the main circuit system 10 and the storage battery system 20 in order to drive the vehicle 100 normally. More specifically, in order to normally charge and discharge the storage battery module 22, (1) when the main circuit system 10 operates based on AC power from the AC overhead line 200 (that is, the vehicle 100 travels in the AC power feeding section). (2) when the main circuit system 10 operates based on the DC power from the DC overhead line 300 (that is, when the vehicle 100 travels in the DC power feeding section), and (3) when the main circuit system 10 is a storage battery. In either case of operating based on DC power from the module 22 (that is, when the vehicle 100 travels in a non-powered section), the SOC (State Of Charge) of the storage battery module 22, or voltage, current, etc. It is necessary to adjust the potential difference between the p-side link 16a and the n-side link 16b according to the information indicating charging / discharging.

In order to realize such voltage adjustment, conventionally, it has been necessary to install relatively large structures such as the above-described step-up chopper and step-down chopper in a limited equipment space. On the other hand, conventionally, there has been a demand for increasing the number of storage battery modules 22 installed in the outfitting space as much as possible to increase the capacity.

Therefore, in the embodiment, as shown in FIG. 1, the step-up chopper is omitted and only the step-down chopper 40 is provided in the vehicle 100 so that a large number of storage battery modules 22 can be installed in a limited equipment space. Further, in the embodiment, by providing a plurality of relay switches 50a to 50f in the vehicle 100, any of the cases (1) to (3) described above using only the step-down chopper 40 without providing the step-up chopper. The voltage adjustment between the main circuit system 10 and the storage battery system 20 can be performed.

Here, the configuration of the step-down chopper 40 and the relay switches 50a to 50f will be described. The relay switches 50a to 50f are examples of the “switching circuit unit”.

The step-down chopper 40 is provided between the p-side link 16 a and the storage battery module 22. The step-down chopper 40 steps down the DC voltage input via the input wiring 40a connected to the contact P1 on the p-side link 16a for the storage battery module 22, and supplies the stepped-down DC voltage through the output wiring 40b. It is comprised so that output to the storage battery module 22 is possible. The output wiring 40b is connected to the p-side wiring 21a of the storage battery module 22.

The relay switch 50 a is provided on the p-side wiring 21 a of the storage battery module 22. The relay switch 50 b is provided on the n-side wiring 21 b of the storage battery module 22. The relay switch 50c is provided on the connection wiring 21c that connects the p-side wiring 21a and the n-side wiring 21b. These three relay switches 50 a to 50 c are configured to be able to switch the series-parallel of the two storage battery modules 22. Specifically, when the relay switches 50a and 50b are in the on state and the relay switch 50c is in the off state, the two storage battery modules 22 are connected in parallel. Conversely, when the relay switches 50a and 50b are in the off state and the relay switch 50c is in the on state, the two storage battery modules 22 are connected in series.

Further, the relay switch 50 d is provided on the input wiring 40 a of the step-down chopper 40. The relay switch 50e is provided on the connection wiring 40c that connects the input wiring 40a and the output wiring 40b of the step-down chopper 40. The two

relay switches

50d and 50e are configured to be switchable between connecting the p-side link 16a and the storage battery module 22 via the step-down chopper 40 or not using the step-down chopper 40. . Specifically, when the relay switch 50 d is on and the relay switch 50 e is off, the p-side link 16 a and the storage battery module 22 are connected via the step-down chopper 40. Conversely, when the relay switch 50d is in the off state and the relay switch 50e is in the on state, the p-side link 16a and the storage battery module 22 are connected without the step-down chopper 40.

The relay switch 50f is provided between the storage battery module 22 and the n-side link 16b. Specifically, the relay switch 50f is provided on the connection wiring 21d that connects the n-side wiring 21b of the storage battery module 22 and the contact P2 on the n-side link 16b. When the relay switch 50f is on, the storage battery module 22 and the n-side link 16b are electrically connected. When the relay switch 50f is off, the storage battery module 22 and the n-side link 16b are connected. The electrical connection is interrupted.

Next, the internal configuration of the storage battery box 21 will be described with reference to FIG. FIG. 2 is an exemplary diagram showing an internal configuration of the storage battery box 21. As shown in FIG. 2, the storage battery box 21 includes a storage battery module 22, a BMS (Battery Management System) 23, and a contactor 24. The BMS 23 is an example of a “monitoring unit”.

The storage battery module 22 includes a plurality of storage batteries 22a and a plurality of CMUs (Cell Monitoring Units) 22b provided to correspond to the plurality of storage batteries 22a on a one-to-one basis. The plurality of storage batteries 22a are connected in series with each other. Each of the plurality of CMUs 22b is configured to be able to detect the voltage value, temperature, and the like of the storage battery 22a corresponding to itself.

The BMS 23 acquires information detected by the plurality of CMUs 22b, monitors the voltage value of the storage battery module 22 based on the acquired information, and calculates the SOC and the like. Then, the BMS 23 notifies the calculated SOC and the like to the main circuit system 10 via the communication interface 23a.

One contactor 24 is provided for each of the p-side wiring 21 a and the n-side wiring 21 b of the storage battery module 22. The two contactors 24 are opened when an abnormality such as a failure occurs in the storage battery module 22, thereby suppressing the influence of the abnormality from reaching the main circuit system 10 side.

2 illustrates the configuration in which one storage battery module 22 is provided in one storage battery box 21, but a plurality of storage battery modules 22 may be provided in one storage battery box 21.

Next, the operation of the relay switches 50a to 50f according to the embodiment will be described with reference to FIGS. As described above, the relay switches 50a to 50f are configured so that (1) the vehicle 100 travels in the AC power feeding section, (2) the vehicle 100 travels in the DC power feeding section, and (3) the vehicle 100 does not feed power. In each case of traveling in a section, the electrical connection relationship among the p-side link 16a and the n-side link 16b, the storage battery module 22, and the step-down chopper 40 is switched.

Embodiment (1) When Vehicle 100 Travels in an AC Power Supply Section First, the operation of relay switches 50a to 50f when (1) the vehicle 100 travels in an AC power supply section will be described with reference to FIG. FIG. 3 is an exemplary diagram showing an electrical connection relationship of each part of the vehicle 100 in the case of (1). In the case of (1), the main circuit system 10 operates by receiving the supply of the AC voltage from the AC overhead line 200, and the storage battery module 22 of the storage battery system 20 is charged by receiving the voltage supply from the main circuit system 10. .

As shown in FIG. 3, in the case of (1), the relay switches 50a to 50f according to the embodiment connect two storage battery modules 22 in series, the two storage battery modules 22 connected in series, and p The side link 16a and the n-side link 16b are directly connected without using the step-down chopper 40.

More specifically, in the case of (1), the two storage battery modules 22 are connected in series when the relay switches 50a and 50b are turned off and the relay switch 50c is turned on. In the case of (1), when the relay switch 50d is turned off and the relay switch 50e is turned on, the two storage battery modules 22 connected in series and the p-side link 16a are stepped down. It is directly connected without going through the chopper 40. Furthermore, in the case of (1), the two storage battery modules 22 and the n-side link 16b are connected by turning on the relay switch 50f.

Here, in the case of (1), the converter 14 of the main circuit system 10 matches the voltage of the two storage battery modules 22 connected in series on the basis of the monitoring result of the BMS 23 (see FIG. 2). DC power is output to the side link 16a and the n-side link 16b. As a result, the DC power output from the converter 14 is adjusted to a magnitude corresponding to the voltage and current of the two storage battery modules 22 connected in series, so that the two storage battery modules 22 are normally charged. be able to. In the case of (1), when charging of the storage battery module 22 is completed, the relay switch 50f is turned off.

Example (2) When Vehicle 100 Runs in DC Power Supply Section Next, the operation of relay switches 50a to 50f when (2) the vehicle 100 travels in a DC power supply section will be described with reference to FIG. FIG. 4 is an exemplary diagram showing an electrical connection relationship of each part of the vehicle 100 in the case of (2). In the case of (2), the main circuit system 10 operates by receiving a DC voltage supplied from the DC overhead line 300, and the storage battery module 22 of the storage battery system 20 is charged by receiving a voltage supply from the main circuit system 10. .

As shown in FIG. 4, in the case of (2), the relay switches 50a to 50f according to the embodiment connect two storage battery modules 22 in parallel, the two storage battery modules 22 connected in parallel, and p The side link 16 a and the n side link 16 b are connected via the step-down chopper 40.

More specifically, in the case of (2), when the relay switches 50a and 50b are turned on and the relay switch 50c is turned off, the two storage battery modules 22 are connected in parallel. Furthermore, in the case of (2), when the relay switch 50d is turned on and the relay switch 50e is turned off, the two storage battery modules 22 connected in parallel and the p-side link 16a are stepped down. It is connected via the chopper 40. Furthermore, in the case of (2), the two storage battery modules 22 and the n-side link 16b are connected by turning on the relay switch 50f.

Here, in the case of (2), the converter 14 of the main circuit system 10 outputs to the two storage battery modules 22 from the p-side link 16a and the n-side link 16b based on the monitoring result of the BMS 23 (see FIG. 2). The direct current voltage is stepped down. As a result, the large voltage supplied from the DC overhead line 300 to the p-side link 16a and the n-side link 16b is stepped down by the step-down chopper 40 and has a magnitude corresponding to the voltage and current of the two storage battery modules 22 connected in parallel. Therefore, the two storage battery modules 22 can be charged normally. As in the case of (1) described above, also in the case of (2), when charging of the storage battery module 22 is completed, the relay switch 50f is turned off.

Example (3) When Vehicle 100 Travels in a Non-Powered Section Next, with reference to FIG. 5, the operation of relay switches 50a to 50f when (3) the vehicle 100 travels in a non-powered section will be described. FIG. 5 is an exemplary diagram showing an electrical connection relationship of each part of the vehicle 100 in the case of (3). In the case of (3), the storage battery module 22 of the storage battery system 20 is discharged toward the main circuit system 10, and the main circuit system 10 operates by receiving supply of a DC voltage from the storage battery module 22.

As shown in FIG. 5, in the case of (3), the relay switches 50a to 50f according to the embodiment connect two storage battery modules 22 in series, the two storage battery modules 22 connected in series, and p The side link 16a and the n-side link 16b are directly connected without using the step-down chopper 40.

More specifically, in the case of (3), the two storage battery modules 22 are connected in series when the relay switches 50a and 50b are turned off and the relay switch 50c is turned on. In the case of (3), when the relay switch 50d is turned off and the relay switch 50e is turned on, the two storage battery modules 22 connected in series and the p-side link 16a are stepped down. It is directly connected without going through the chopper 40. Furthermore, in the case of (3), the two storage battery modules 22 and the n-side link 16b are connected by turning on the relay switch 50f. As a result, since the two storage battery modules 22 are connected in series to increase the voltage on the storage battery system 20 side, the voltage on the storage battery system 20 side can be set to the operation of the main circuit system 10 without providing a boost chopper. The size can be adjusted to correspond to the voltage.

As described above, the vehicle 100 according to the embodiment includes the case where the vehicle 100 travels in the AC power feeding section (in the case of FIG. 3), the case where the vehicle 100 travels in the DC power feeding section (see FIG. 4), and the vehicle 100. When the vehicle travels in a non-powered section (see FIG. 5), the series-parallel connection relationship of the storage battery modules 22 is switched, and the p-side link 16a and the n-side link 16b Relay switches 50a to 50f for switching various connection relationships. Thereby, voltage adjustment between the main circuit system 10 and the storage battery system 20 can be performed according to the situation by the step-down chopper 40 and the relay switches 50a to 50f without providing the step-up chopper. As a result, many storage battery modules 22 can be installed in the surplus space generated by omitting the boost chopper. That is, according to the embodiment, a large number of storage battery modules 22 can be installed in a limited outfitting space.

The technology of the above-described embodiment is applicable to various vehicles such as a railway vehicle, a trolley bus, and an LRV (Light Rail Vehicle) as long as the vehicle can travel in an AC feeding section, a DC feeding section, and a non-feeding section. . Moreover, in embodiment mentioned above, the example in which an overhead wire (AC overhead wire and DC overhead wire) was used as an electric power system (AC system and DC system) was shown. However, in the embodiment, for example, a power system other than the overhead line such as a power feeding rail (so-called third rail) provided separately from the traveling rail may be used.

As mentioned above, although embodiment of this invention was described, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiment can be implemented in various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The above-described embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Claims

A converter capable of converting single-phase AC power into DC power;
An inverter capable of converting DC power into three-phase AC power;
A pair of DC links connecting the DC input / output side of the converter and the DC input / output side of the inverter;
A plurality of storage battery modules electrically connected to the pair of DC links;
DC power that is provided between the positive DC link of the pair of DC links and the positive side of the plurality of storage battery modules, and that outputs DC power from the positive DC link to the positive side of the storage battery modules. A step-down chopper capable of stepping down,
An AC power feeding section that receives single-phase AC power from the AC system, a DC power feeding section that receives DC power from the DC system, and a non-powered section that does not receive power from the outside, A vehicle comprising: a switching circuit unit that switches an electrical connection relationship between the pair of DC links, the plurality of storage battery modules, and the step-down chopper while switching an electrical connection relationship in series or in parallel.
An AC power supply device provided on the AC input / output side of the converter, and connected to the AC system when the vehicle travels in the AC power supply section;
When the AC power supply device is connected to the AC system and a plurality of storage battery modules are charged based on single-phase AC power from the AC system, the switching circuit unit connects the plurality of storage battery modules in series, The positive side of the plurality of storage battery modules connected in series and the DC link on the positive side are directly connected without going through the step-down chopper, the negative side of the plurality of storage battery modules connected in series and the pair of The vehicle according to claim 1, wherein the vehicle is connected to a negative DC link among the DC links.
A monitoring unit for monitoring the voltage of the storage battery module;
The converter converts single-phase AC power from the AC system into DC power in accordance with voltages of the plurality of storage battery modules connected in series based on a monitoring result of the monitoring unit. The vehicle described.
A DC power supply device connected to the pair of DC links and connected to the DC system when the vehicle travels in a DC power supply section;
When the AC power supply device is connected to the DC system and a plurality of storage battery modules are charged based on DC power from the DC system, the switching circuit unit connects the plurality of storage battery modules in parallel. The positive side of the plurality of storage battery modules connected and the DC link on the positive side are connected via the step-down chopper, and the negative side of the plurality of storage battery modules connected in parallel and the pair of DC links The vehicle according to claim 1, wherein the vehicle is connected to a negative side DC link.
A monitoring unit for monitoring the voltage of the storage battery module;
The step-down chopper is a DC power output from the positive DC link to the positive side of the storage battery module according to the voltage of the plurality of storage battery modules connected in parallel based on the monitoring result of the monitoring unit. The vehicle according to claim 4, wherein the vehicle pressure is reduced.
The vehicle according to claim 2, wherein when the charging of the plurality of storage battery modules is completed, the switching circuit unit cuts off an electrical connection between the negative side of the plurality of storage battery modules and the DC link on the negative side. .
When the vehicle travels in the non-powered section, the switching circuit unit connects the plurality of storage battery modules in series, and the positive side and the positive side DC link of the plurality of storage battery modules connected in series. The vehicle according to claim 1, wherein the vehicle is directly connected without going through the step-down chopper, and the negative side of the plurality of storage battery modules connected in series is connected to the negative DC link of the pair of DC links. .