JP5038339B2 - Power supply method and AC train power supply system - Google Patents

Description

  The present invention relates to a power supply method for an AC / DC train.

An alternating-current DC train is known as a train that can travel in both an AC section and a DC section.
In general, in AC sections, single-phase AC power collected by a pantograph is stepped down by a main transformer and then converted to DC power by a converter unit, and converted to three-phase AC power by an inverter unit in an AC section. The main motor is driven. Further, in the DC section, the main motor is driven by converting the DC power collected by the pantograph into three-phase AC power by the inverter unit without going through the main transformer and the converter unit (for example, Patent Document 1). ).

  In addition to the main circuit for driving the main motor, the train has an auxiliary circuit for driving auxiliary equipment (hereinafter referred to as “auxiliary equipment”) such as an air conditioner, a lighting device, and an air compressor. There is. An auxiliary circuit of an AC / DC train is generally configured to include an auxiliary rectifier corresponding to the converter section of the main circuit and a static inverter section (SIV) corresponding to the inverter section of the main circuit. is there. In this auxiliary circuit, in the AC section, the single-phase AC power stepped down by the auxiliary winding of the main transformer is converted to DC by the auxiliary rectifier, and converted to three-phase AC by the static inverter unit and used as auxiliary equipment. Supplied. Further, in the DC section, the DC power collected by the pantograph is converted into AC power by the static inverter unit and supplied to the auxiliary equipment without going through the auxiliary rectifier.

Japanese Patent Laid-Open No. 7-7808

  However, the AC / DC train includes the various devices described above for traveling in the AC section and the DC section, but there are devices that are not used in the DC section. For example, although the converter unit is an expensive device, it was not operated in the DC section. Further, if a large and expensive stationary inverter unit can be eliminated, it is advantageous in terms of the installation space under the floor and the cost.

  The present invention has been made in view of such a problem, and an object thereof is to provide a power supply system for an AC / DC train having an efficient circuit configuration.

The first invention for solving the above problems is:
AC power from the feeder in the AC section is applied to the main transformer, and the main motor is driven through a main converter having a converter unit and an inverter unit connected to the secondary winding of the main transformer, In the DC section, a DC power supply method for driving the main motor by applying DC power from the feeder to the DC link portion of the main converter,
In the AC section, the AC section auxiliary equipment power supply step in which the auxiliary rectifier converts the AC power supplied from the auxiliary winding of the main transformer into DC power and supplies the power to the power line of the auxiliary equipment,
An input end connection control step of connecting the input end of the converter unit to the secondary side of the main transformer in the AC section, and connecting to the power line of the auxiliary device in the DC section;
The converter unit operates in the forward direction in the AC section to function as an AC-DC converter, and operates in the reverse direction in the DC section to step down the DC power applied to the DC link section and output it from the input end. A converter unit control step that functions as a DC-DC converter;
A power supply method including:

As another invention,
AC power from the feeder in the AC section is applied to the main transformer, and the main motor is driven through a main converter having a converter unit and an inverter unit connected to the secondary winding of the main transformer, In the DC section, a DC power supply system for driving the main motor by applying DC power from the feeder to the DC link portion of the main converter,
An auxiliary rectifier connected to the auxiliary winding of the main transformer and supplying DC power to the power line of the auxiliary device in the AC section;
The input end of the converter unit is connected to the secondary side of the main transformer in the AC section, and the input end connection control unit is connected to the power line of the auxiliary device in the DC section;
The converter unit operates in the forward direction in the AC section to function as an AC-DC converter, and operates in the reverse direction in the DC section to step down the DC power applied to the DC link section and output it from the input end. A converter unit controller that functions as a DC-DC converter;
You may comprise the power supply system for AC / DC trains provided with.

  According to the first aspect of the invention, power is supplied to the power line of the auxiliary device through the auxiliary winding of the main transformer and the auxiliary rectifier in the AC section. The input terminal is connected and power is supplied from the converter unit. The converter unit has an input end connected to the secondary side of the main transformer in the AC section and functions as an AC-DC converter by forward operation, but in the DC section, the input end serves as the power line of the auxiliary equipment. Connected and functions as a DC-DC converter by reverse operation.

  That is, in the DC section, the converter unit is operated as a DC-DC converter that is supplied with DC power from the feeder line at the output end and outputs DC power from the input end, and supplies the output power to the power line of the auxiliary device. It will be.

  Therefore, since the converter unit is used in both the AC section and the DC section, the utilization factor can be improved. In addition, since DC power is supplied to the power line of the auxiliary equipment regardless of whether it is in an AC section or a DC section, auxiliary equipment for a general AC train that uses DC power as a power source is used as an AC / DC train. By installing, a static inverter device can be dispensed with.

A second invention is a power supply method according to the first invention,
The AC / DC train is composed of a plurality of vehicles including the main conversion device,
The input end connection control step is a step of connecting the input ends of the converter units of the main converters in parallel to the power line of the auxiliary device in the DC section.
A power supply method may be configured.

  As a result of using the converter unit even in the DC section, the failure rate of the converter unit can be improved. If the converter unit fails, power cannot be supplied to the inverter unit in the subsequent stage, and the main motor cannot be driven in the AC section. It is possible to run. However, since the power supply to the auxiliary device is stopped in the DC section, a situation in which the auxiliary device cannot be operated occurs. Therefore, as in the second invention, in the DC section, the converter of one vehicle is configured by connecting the input end of the converter unit of each main converter of each vehicle in parallel to the power line of the auxiliary equipment. Even when the unit fails, the converter unit of another vehicle can supply power to the auxiliary device, and the situation where the auxiliary device becomes inoperable can be avoided.

The figure which shows an example of the circuit structure of the power supply system for AC / DC trains of this embodiment. The figure which shows an example of the circuit structure of the power supply system for AC / DC trains of this embodiment. The figure which shows an example of the circuit structure of a converter part. The figure which shows the modification of the power supply system for AC / DC trains. The figure which shows an example of the circuit structure of the power supply system for conventional DC / DC trains. The figure which shows an example of the circuit structure of the power supply system for conventional DC / DC trains.

  Hereinafter, an example of an embodiment suitable for the present invention will be described with reference to the drawings. However, embodiments to which the present invention can be applied are not limited to this.

1. Conventional AC DC Power Supply System Before describing an embodiment to which the present invention is applied, a circuit configuration of a conventional AC DC power supply system will be briefly described. 5 and 6 are diagrams showing a schematic circuit configuration of a conventional AC / DC train power supply system 1000. FIG. 5 shows a power supply operation when traveling in an AC section, and FIG. 6 shows a DC section. The power supply operation when traveling is shown.

  The AC / DC train power supply system 1000 includes a main transformer 70, a main converter 400, an auxiliary rectifier 600, a static inverter 900, and a plurality of switch units, and drives the main motor 3. The main circuit, which is a power supply system for driving, and the auxiliary circuit, which is a power supply system for driving auxiliary equipment, are roughly divided. Main conversion device 400 includes converter unit 200, inverter unit 30, and filter capacitor 31 connected in parallel to the input terminal of inverter unit 30. Although not shown, the AC / DC train power supply system 1000 includes various control units and a control device that controls the AC / DC train power supply system 1000 in an integrated manner.

  The switch units 50-1, 50-2, 50-3, 81 have a known switch mechanism including a contactor, a high-speed circuit breaker, and the like. The switch unit 81 connects the main transformer 70 to the pantograph 2 in the AC section (FIG. 5), and connects the DC link section between the converter unit 200 and the inverter unit 30 to the pantograph 2 in the DC section (FIG. 6). To be switched. The switch units 50-1 and 50-2 are controlled to open in the AC section (FIG. 5) and closed in the DC section (FIG. 6), and the switch section 50-3 is in the AC section. Control is performed so as to close (FIG. 5) and open in the DC section (FIG. 6).

  As a whole, in the AC circuit power supply system 1000, the main circuit 70 steps down the single-phase AC power supplied from the feeder via the pantograph 2 in the AC section. The converter unit 200 converts it into DC power, and the inverter unit 30 generates three-phase AC power to drive the main motor 3. On the auxiliary circuit side, AC power supplied through the auxiliary winding 77 of the main transformer 70 is converted into DC power by the auxiliary rectifier 600, and further, the static inverter 900 is converted into three-phase AC power for AC 3 The power is supplied to the power line of the phase power auxiliary equipment 6.

  On the other hand, in the DC section, on the main circuit side, the DC power supplied from the feeder via the pantograph 2 is applied to the DC link portion of the main converter 400, and the inverter unit 30 drives the main motor 3 for three. Generate phase AC power. On the auxiliary circuit side, the DC power from the pantograph 2 is applied to the input terminal of the static inverter unit 900, and the static inverter unit 900 generates three-phase AC power and supplies it to the power line of the AC three-phase power auxiliary device 6. To do.

  Therefore, in the DC section, converter unit 200 and auxiliary rectifier 600 are in a non-operating state. Further, the auxiliary circuit of the AC / DC train power supply system 1000 is configured to include a static inverter 900 to cope with both the AC section and the DC section. It was configured as a phase power supply auxiliary device 6.

  Of course, auxiliary equipment of AC single phase power supply and auxiliary equipment of DC power supply are also mounted, but the power supply for these auxiliary equipment is supplied by an auxiliary transformer or auxiliary rectifier connected to the subsequent stage of the static inverter 900. It was.

2. Embodiments of AC / DC Train Power Supply System to which the Present Invention is Applied FIGS. 1 and 2 are diagrams showing a schematic circuit configuration of an AC / DC train power supply system 1 to which the present invention is applied, and FIG. FIG. 2 shows the power supply operation when traveling in the DC section. In addition, the same code | symbol is attached | subjected about the same component as the power supply system 1000 for conventional DC / DC trains, and description is abbreviate | omitted.

  The AC train power supply system 1 includes a control device 10, a main converter 40, an auxiliary rectifier 60, a main transformer 70, and a plurality of switch units. A significant difference from the conventional AC / DC train power supply system 1000 is that the switch units 83 (83-1, 83-2) and 87 (87-) are provided between the converter unit 20 and the auxiliary rectifier 60 and the main transformer 70, respectively. 1, 87-2), the input end of the converter unit 20 and the power line L of the auxiliary device are connected via the switch unit 85 (85-1, 85-2), and the static inverter 900 is not required. The point which is made and the structure of the converter part 20 differ. In addition, a comparatively large capacity auxiliary device such as a cooling / heating device has been replaced from the AC three-phase power auxiliary device 6 to the DC power auxiliary device 5.

  The switch portions 81, 83, 87, 85 are configured with a known switch mechanism including a contactor, a high-speed circuit breaker, and the like, and the opening / closing operation or switching operation is controlled by the control device 10. The switch unit 81 connects the main transformer 70 to the pantograph 2 in the AC section (FIG. 1), and connects the DC link section between the converter unit 20 and the inverter unit 30 to the pantograph 2 in the DC section (FIG. 2). To be switched. The switch units 83 and 87 are controlled so as to close in the AC section (FIG. 1) and open in the DC section (FIG. 2), and the switch section 85 opens in the AC section (FIG. 1). ), And is controlled so as to close in the DC section (FIG. 2).

  FIG. 3 is a diagram illustrating a schematic circuit configuration of the converter unit 20. The converter unit 20 is configured to include a switch circuit unit 21 in the preceding stage of the PWM converter device 23. The PWM converter device 23 functions as a PWM converter by the forward operation in the AC section, and controls the operation as a multi-phase multiple chopper circuit by the reverse operation in the DC section in combination with the opening / closing operation of the switch circuit unit 21. And controlled to function as a DC-DC converter. The operation direction control and the opening / closing operation of the switch circuit unit 21 are controlled based on a control signal from the control device 10. The switch operation of the switch circuit unit 21 in the DC section is as shown in FIG. 3, and in the AC section, opening and closing is controlled in reverse. In addition, since the structure itself which makes the converter part 20 operate | move reversely as a DC-DC converter can apply a well-known technique, detailed description is abbreviate | omitted.

  The input end of the converter unit 20 is connected to the secondary winding 83 of the main transformer 70 via the switch unit 83, and the output end of the converter unit 20 (the DC link unit of the main converter 40) is connected to the switch unit. It is connected to the pantograph 2 via 81.

  Therefore, the converter unit 20 converts the single-phase AC power from the secondary winding 73 into DC power and outputs it to the DC link unit in the AC section, and outputs the DC power from the feeder via the pantograph 2 in the DC section. The operation is controlled so that the DC power applied to the link unit is stepped down and output from the input end.

  The overall circuit operation of the AC DC power supply system 1 is as follows. That is, in the AC section, as shown in FIG. 1, the main transformer 70 steps down the single-phase AC power supplied from the electric wire via the pantograph 2, and the converter unit 20 converts the stepped-down AC power into DC power. Then, the inverter unit 30 generates three-phase AC power and drives the main motor 3. Further, the single-phase AC power supplied through the auxiliary winding 77 of the main transformer 70 is converted into DC power by the auxiliary rectifier 600 and supplied to the power line L of the DC power auxiliary device 5.

  On the other hand, in the DC section, as shown in FIG. 2, the DC power supplied from the feeder via the pantograph 2 is applied to the DC link portion of the main converter 400, and the inverter unit 30 drives the main motor 3. Generate three-phase AC power. Further, the converter unit 20 operated in the reverse direction steps down the DC power applied to the DC link unit and outputs it from the input terminal, and supplies the stepped down DC power to the power line L of the DC power supply auxiliary device 5.

  Therefore, the converter unit 20 is used in both the AC section and the DC section. Further, DC power is supplied to the power supply line L of the auxiliary device regardless of whether it is an AC section or a DC section. The DC power supply auxiliary device 5 can be configured by general train auxiliary devices using DC power as a power source. For this reason, the auxiliary circuit which does not require a static inverter apparatus is realizable.

  In the above-described embodiment, since the converter unit 20 is always in operation, the failure rate may be improved as compared to the conventional AC / DC train power supply system 1000. When the converter unit 20 breaks down, it becomes impossible to supply power for driving the main motor 3 in the AC section, but since the insufficient torque is supplemented by the other M cars in the train, the train can run. . However, in the direct current section, power cannot be supplied to the power supply line L of the auxiliary device, so that the auxiliary device cannot operate.

  Therefore, as shown in FIG. 4, in the DC section, the input ends of the converter units 20 of the main converters 40 mounted on the plurality of M cars in the train are connected in parallel to the power line L of the auxiliary equipment. A DC train power supply system 1A is configured. Each switch in FIG. 4 indicates an opening / closing operation in a DC section. By comprising in this way, even if it is a case where the converter part of one vehicle fails, the situation where an auxiliary | assistant apparatus becomes inoperable can be avoided.

DESCRIPTION OF SYMBOLS 1,1A DC train power supply system 10 Controller 40 Main converter 20 Converter unit 30 Inverter unit 60 Auxiliary rectifier 70 Main transformer 73 Secondary winding 77 Auxiliary winding 81, 83, 85, 87 Switch unit 2 Pantograph 3 Main motor 5 DC power supply auxiliary equipment 7 Grounding

Claims (3)

AC power from the feeder in the AC section is applied to the main transformer, and the main motor is driven through a main converter having a converter unit and an inverter unit connected to the secondary winding of the main transformer, In the DC section, a DC power supply method for driving the main motor by applying DC power from the feeder to the DC link portion of the main converter,
In the AC section, the AC section auxiliary equipment power supply step in which the auxiliary rectifier converts the AC power supplied from the auxiliary winding of the main transformer into DC power and supplies the power to the power line of the auxiliary equipment,
An input end connection control step of connecting the input end of the converter unit to the secondary side of the main transformer in the AC section, and connecting to the power line of the auxiliary device in the DC section;
The converter unit operates in the forward direction in the AC section to function as an AC-DC converter, and operates in the reverse direction in the DC section to step down the DC power applied to the DC link section and output it from the input end. A converter unit control step that functions as a DC-DC converter;
Power supply method including. The AC / DC train is composed of a plurality of vehicles including the main conversion device,
The input end connection control step is a step of connecting the input ends of the converter units of the main converters in parallel to the power line of the auxiliary device in the DC section.
The power supply method according to claim 1. AC power from the feeder in the AC section is applied to the main transformer, and the main motor is driven through a main converter having a converter unit and an inverter unit connected to the secondary winding of the main transformer, In the DC section, a DC power supply system for driving the main motor by applying DC power from the feeder to the DC link portion of the main converter,
An auxiliary rectifier connected to the auxiliary winding of the main transformer and supplying DC power to the power line of the auxiliary device in the AC section;
The input end of the converter unit is connected to the secondary side of the main transformer in the AC section, and the input end connection control unit is connected to the power line of the auxiliary device in the DC section;
The converter unit operates in the forward direction in the AC section to function as an AC-DC converter, and operates in the reverse direction in the DC section to step down the DC power applied to the DC link section and output it from the input end. A converter unit controller that functions as a DC-DC converter;
Power supply system for AC trains equipped with

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