JP2005304158A - Circuit where self arc-extinguishing elements are multi-connected in series in self-excited power converter for superconducting magnetic levitation railway - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the overvoltage at turn off of a self arc-extinguishing element by lessening the inductance of wiring to a charge/discharge snubber circuit and a clamp snubber circuit to the utmost. <P>SOLUTION: Charge/discharge snubber circuits 11-1 to 11-n are arranged on one side and also a clamp snubber circuit 12 is arranged on the other side, centering upon a stack 14 where self arc-extinguishing elements 10-1 to 10-n are multi-connected and welded with pressure in series. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a multi-series connection circuit of self-extinguishing elements in a self-excited power converter for a superconducting magnetic levitation railway.

  Currently, in the field of railways, the development of levitating railways using superconducting magnets, that is, superconducting magnetic levitation vehicles, is being developed.

  In this superconducting magnetic levitation railway, a vehicle is levitated and propelled by a propulsive force and a levitating guide force applied to a superconducting magnet mounted on the vehicle.

  FIG. 3 is a circuit diagram showing a configuration example of a multi-series connection circuit of self-extinguishing elements in a self-excited power converter for this type of conventional superconducting magnetic levitation railway.

  In addition, in FIG. 3, it has shown about the structural example of the n series connection circuit of a self-extinguishing type | mold element.

  In FIG. 3, the stack 14 has a configuration in which n self-extinguishing elements 10-1, 10-2, and 10-n sandwiched between heat sinks 13-1 to 13-2n are connected in series and pressed. .

  In order to suppress the turn-off overvoltage generated between the main electrodes of the self-extinguishing element when the multi-series connected self-extinguishing elements are turned off, the snubber circuit includes a charge / discharge snubber circuit 11 and a clamp. The snubber circuit 12 is used in combination. A self-extinguishing element having such a configuration is described in Patent Document 1, for example.

  Here, the charge / discharge snubber circuit 11 is connected to each of the multi-series connected self-extinguishing elements 10-1, 10-2, and 10-n, and mainly the multi-series connected self-extinguishing elements 10 are connected. -1, 10-2, 10-n is used for the purpose of maintaining the voltage sharing at the time of OFF.

  The clamp snubber circuit 12 is connected to the self-extinguishing elements 10-1, 10-2, 10-n connected in series in a lump, and is mainly connected to the self-excited power converter from the DC capacitor. Turn-off generated between the main electrodes when the self-extinguishing elements 10-1, 10-2, 10-n are turned off by the inductance of the circuit of the DC circuit up to the arc-extinguishing elements 10-1, 10-2, 10-n. Used for the purpose of suppressing overvoltage.

In this case, the stack 14, the charge / discharge snubber circuit 11, and the clamp snubber circuit 12 in which the conventional self-extinguishing elements 10-1, 10-2, and 10 -n are connected in series are arranged as shown in FIG. On one side, charge / discharge snubber circuits 11-1, 11-2, 11-n connected to each self-extinguishing element 10-1, 10-2, 10-n, and n series-connected self-extinguishing type A clamp snubber circuit 12 connected to the elements 10-1, 10-2, and 10-n in a lump is disposed.
Japanese Patent No. 30020080

  However, in the multi-series connection circuit of self-extinguishing elements in the self-excited power converter for a superconducting magnetic levitation railway having such an arrangement, the multi-series connection self-extinguishing elements 10-1, 10-2, When the self-extinguishing elements 10-1, 10-2, and 10-n are turned off because the wiring from the stack 14 pressed to 10-n to the clamp snubber circuit 12 becomes long and the wiring inductance increases. There is a problem that the turn-off overvoltage generated between the main electrodes of the self-extinguishing elements 10-1, 10-2, 10-n increases.

  In addition, the charge / discharge snubber circuits 11-1, 11-2, 11-n have different wiring lengths to the self-extinguishing elements 10-1, 10-2, 10-n. The inductance xdi / dt of the wirings 11-1, 11-2, 11-n causes a difference in the magnitude of the turn-off overvoltage appearing in each of the self-extinguishing elements 10-1, 10-2, 10-n. There is a problem that the turn-off overvoltage of only one self-extinguishing element is increased.

  When the turn-off overvoltage of the self-extinguishing elements 10-1, 10-2, 10-n is large as described above, it is applied to the self-extinguishing elements 10-1, 10-2, 10-n. It is necessary to use with a reduced DC voltage, resulting in a reduced device capacity by reducing the DC voltage.

  Further, in order to obtain the same device capacity, it is necessary to increase the number of serially connected self-extinguishing elements, which causes problems such as an increase in the size of the device and an increase in the price of the device.

  An object of the present invention is to provide a self-excited power converter for a superconducting magnetic levitation railway capable of suppressing the turn-off overvoltage of a self-extinguishing element by minimizing the inductance of the wiring to the charge / discharge snubber circuit and the clamp snubber circuit. To provide a multi-series connection circuit of self-extinguishing elements in an apparatus.

  Another object of the present invention is to equalize the inductance of the wiring to the self-extinguishing element of each charging / discharging snubber circuit and to determine the main of each self-extinguishing element by the inductance of the wiring of the charging / discharging snubber circuit. An object of the present invention is to provide a multi-series connection circuit of self-extinguishing elements in a superconducting magnetic levitation type self-excited power converter for a railway capable of equalizing the magnitude of a turn-off overvoltage generated between electrodes.

To achieve the above object, a multi-series connection circuit of self-extinguishing elements in a self-excited power converter for a superconducting magnetic levitation railway in which a vehicle is levitated and propelled by a propulsive force and a levitating guide force applied to a superconducting magnet. In
In the invention corresponding to claim 1, a stack formed by press-contacting a plurality of series-connected self-extinguishing elements, a charge / discharge snubber circuit connected to each of the plurality of series-connected self-extinguishing elements, A clamp snubber circuit collectively connected to a plurality of self-extinguishing elements connected in series, with a charge / discharge snubber circuit arranged on one side and a clamp on the other side centered on the stack A snubber circuit is arranged.

  Therefore, in the multi-series connection circuit of self-extinguishing elements in the superconducting magnetic levitation railway self-excited power converter of the invention corresponding to claim 1, a charge / discharge snubber circuit is arranged on one side with the stack as the center. At the same time, by arranging the clamp snubber circuit on the other side, the inductance of the charge / discharge snubber circuit and the wiring to the clamp snubber circuit can be reduced as much as possible, and the turn-off overvoltage of the self-extinguishing element can be suppressed.

  In the invention corresponding to claim 2, a stack formed by pressure-contacting a plurality of series-connected self-extinguishing elements, and a charge / discharge snubber connected to each of the plurality of series-connected self-extinguishing elements. The charge / discharge snubber circuit has the same structural arrangement for each self-extinguishing element.

  Therefore, in the multi-series connection circuit of self-extinguishing elements in the superconducting magnetic levitation railway self-excited power converter of the invention corresponding to claim 2, each charge / discharge snubber circuit is connected to each self-extinguishing element. By making the structural arrangements the same, the inductance of the wiring to the self-extinguishing element of each charge / discharge snubber circuit is equalized, and the inductance (xdi / dt) of the wiring of the charge / discharge snubber circuit The magnitude of the turn-off overvoltage generated between the main electrodes of the arc extinguishing element can be made equal.

  According to the multi-series connection circuit of self-extinguishing elements in the superconducting magnetic levitation railway self-excited power converter of the present invention, the inductance of the wiring to the charge / discharge snubber circuit and the clamp snubber circuit is reduced as much as possible to reduce self-extinguishing. It becomes possible to suppress the turn-off overvoltage of the arc type element.

  Further, the inductance of the wiring to the self-extinguishing element of each charge / discharge snubber circuit is equalized, and the turn-off overvoltage generated between the main electrodes of each self-extinguishing element is increased by the inductance of the wiring of the charge / discharge snubber circuit. Can be made equivalent.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing an example of a multi-series connection circuit of self-extinguishing elements in a self-excited power converter for a superconducting magnetic levitation type railway according to the present embodiment. A description thereof will be omitted, and only different parts will be described here.

  That is, as shown in FIG. 1, the multi-series connection circuit of self-extinguishing elements according to the present embodiment includes the self-extinguishing elements 10-1 to 10-n in FIG. With the stack 14 as a center, the charge / discharge snubber circuits 11-1 to 11-n are arranged on one side, and the clamp snubber circuit 12 is arranged on the other side.

  Next, in the multi-series connection circuit of self-extinguishing elements in the self-excited power converter for a superconducting magnetic levitation type railway according to the present embodiment configured as described above, each stack is connected to one side centered on the stack 14. By disposing the discharge snubber circuits 11-1 to 11-n and the clamp snubber circuit 12 on the other side, not only the charge / discharge snubber circuits 11-1 to 11-n but also the clamp snubber circuit 12 is provided. It is possible to shorten the wiring to the stack 14 in which the self-extinguishing elements 10-1 to 10-n are connected in series.

  Thereby, the inductance of the wiring among the self-extinguishing elements 10-1 to 10-n, the charge / discharge snubber circuits 11-1 to 11-n, and the clamp snubber circuit 12 is reduced as much as possible. A turn-off overvoltage of 1 to 10-n can be suppressed.

  As described above, in the multi-series connection circuit of self-extinguishing elements in the self-excited power converter for superconducting magnetic levitation type railway according to the present embodiment, the charge / discharge snubber circuit 11-1 is arranged on one side with the stack 14 as the center. ~ 11-n and the clamp snubber circuit 12 are arranged on the other side, so that the inductance of the wiring to the charge / discharge snubber circuits 11-1 to 11-n and the clamp snubber circuit 12 is reduced as much as possible. Thus, it is possible to suppress the turn-off overvoltage that occurs when the self-extinguishing elements 10-1 to 10-n are turned off.

(Second Embodiment)
FIG. 2 is a configuration diagram showing an example of a multi-series connection circuit of self-extinguishing elements in the self-excited power converter for a superconducting magnetic levitation railway according to the present embodiment. A description thereof will be omitted, and only different parts will be described here.

  That is, as shown in FIG. 2, the multi-series connection circuit of self-extinguishing elements according to the present embodiment has a charge / discharge snubber for the self-extinguishing elements 10-1 to 10-n in FIG. The circuits 11-1 to 11-n are configured to have the same structural arrangement.

  In FIG. 2, as an example, the conductor blocks 15-1 to 15- (n-1) are installed between the heat sinks 13-1 to 13-2n for cooling the self-extinguishing elements 10-1 to 10-n. Thus, the structural arrangement of the charge / discharge snubber circuits 11-1 to 11-n is the same as that of the self-extinguishing elements 11-1 to 11-n.

  Next, in the multi-series connection circuit of self-extinguishing elements in the self-excited power converter for superconducting magnetic levitation railway according to the present embodiment configured as described above, self-extinguishing elements 10-1 to 10- Since the structural arrangement of the charge / discharge snubber circuits 11-1 to 11-n is the same with respect to n, multi-series connected self-extinguishing elements 10-1 to 10-n It is possible to equalize the inductances of the wirings of the charge / discharge snubber circuits 11-1 to 11-n.

  Thereby, the magnitudes of the turn-off overvoltages generated between the main electrodes of the self-extinguishing elements 10-1 to 10-n by the inductance xdi / dt of the wirings of the charge / discharge snubber circuits 11-1 to 11-n are made equal. can do.

  As described above, in the multi-series connection circuit of self-extinguishing elements in the self-excited power converter for a superconducting magnetic levitation railway according to the present embodiment, for the self-extinguishing elements 10-1 to 10-n, Since the charge / discharge snubber circuits 11-1 to 11-n have the same structure, the self-extinguishing elements 10-1 to 10-n of the charge / discharge snubber circuits 11-1 to 11-n are used. The inductances of the wirings up to 5 are equalized, and the inductances (xdi / dt) of the wirings of the charge / discharge snubber circuits 11-1 to 11-n are connected between the main electrodes of the self-extinguishing elements 10-1 to 10-n. It is possible to make the magnitude of the generated turn-off overvoltage equal.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation.
In addition, the embodiments may be combined as appropriate as possible, and in that case, the combined effects can be obtained.
Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent requirements.
For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem (at least one) described in the column of the problem to be solved by the invention can be solved, and the effect of the invention can be solved. When (at least one of) the effects described in the column can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows 1st Embodiment of the multi-series connection circuit of the self-extinguishing type element in the self-excited power converter for superconducting magnetic levitation type railways by this invention. The block diagram which shows 2nd Embodiment of the multi-series connection circuit of the self-extinguishing type | mold element in the self-excitation power converter for superconducting magnetic levitation type railroads by this invention. The block diagram which shows an example of the multi-series connection circuit of the self-extinguishing type | mold element in the conventional self-excited power converter for superconducting magnetic levitation type railways.

Explanation of symbols

  10-1 to 10-n ... self-extinguishing element, 11-1 to 11-n ... charge / discharge snubber circuit, 11-a ... charge / discharge snubber diode, 11-b ... charge / discharge snubber capacitor, 11-c ... charge Discharge snubber resistor, 12 ... Clamp snubber circuit, 12a ... Clamp snubber capacitor, 12b ... Clamp snubber resistor, 12c ... Clamp snubber diode, 13-1 to 13-2n ... Heat sink, 14 ... Multi-series connected self-extinguishing element , 15-1 to 15- (n−1)... Conductor block.

Claims (2)

In a multi-series connection circuit of self-extinguishing elements in a self-excited power converter for a superconducting magnetic levitation railway in which a vehicle is levitated and propelled by a propulsion force and a levitating guide force applied to a superconducting magnet,
A stack formed by pressure-contacting a plurality of self-extinguishing elements connected in series;
A charge / discharge snubber circuit connected to each of the plurality of self-extinguishing elements connected in series;
A clamp snubber circuit collectively connected to the plurality of self-extinguishing elements connected in series,
A self-excited power converter for a superconducting magnetically levitated railway comprising the charge / discharge snubber circuit on one side and the clamp snubber circuit on the other side centered on the stack. Multiple series connection circuit of arc extinguishing type elements. In a multi-series connection circuit of self-extinguishing elements in a self-excited power converter for a superconducting magnetic levitation railway in which a vehicle is levitated and propelled by a propulsion force and a levitating guide force applied to a superconducting magnet,
A stack formed by pressure-contacting a plurality of self-extinguishing elements connected in series;
A charge / discharge snubber circuit connected to each of the plurality of self-extinguishing elements connected in series;
The number of self-extinguishing elements in the superconducting magnetic levitation railway self-excited power converter is such that the charge / discharge snubber circuit has the same structural arrangement with respect to each self-extinguishing element. Series connection circuit.

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