JP2002271901A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure redundancy of the whole system not only for failure in an inverter, but also for failure in a motor fan. SOLUTION: In the case of the failure in the motor fan 16b which applies forced draft to a CVCF inverter 9', a circuit element of an inverter converting part cannot be cooled, so that the inverter which performs forced draft with the motor fan 16b is required to be disconnected. The CVCF inverter and a plurality of groups of VVVF inverters 4a' are disconnected from the system and the VVVF inverter 4b' is switched to the CVCF inverter so as to be driven. At that time, the VVVF inverters 4b' to be switched is arranged so as to be forcibly blown from another motor fan 16a, thereby ensuring redundancy for failure in the motor fan 16b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plurality of groups of variable voltage variable frequency inverters (hereinafter, referred to as "VVVF inverters") for a main power supply and a group of constant voltage constant frequency inverters (hereinafter, "CVCF") for an auxiliary power supply. And an inverter).

[0002]

2. Description of the Related Art Conventionally, a plurality of VVVF inverters and one C
A system has been proposed in which a VCF inverter is used as one system, and when a CVCF inverter fails, the CVCF inverter is stopped and disconnected, and one of a plurality of sound VVVF inverters is switched to a CVCF inverter to operate. I have. FIG. 8 shows a circuit configuration of a conventional example of a power converter in such a railway vehicle system.

In this conventional power converter, the pantograph 1 includes circuit breakers 2a and 2b and a filter reactor 3
a, 3b, a plurality of VVVF inverters 4a ',
4b 'is connected to the positive input terminal, and its negative input terminal is connected to the wheel GB.
1 and GB2. A filter capacitor 5 is connected between the positive input terminal and the negative input terminal of the VVVF inverters 4a 'and 4b'.
A main motor 6 for driving the vehicle is connected to the output terminals of the F inverters 4a 'and 4b' as a main power supply load. In addition,
A predetermined VVVF inverter 4b 'among these VVVF inverters 4a' and 4b 'is controlled by the control unit 7 so that it can be driven as a CVCF inverter.

[0004] The control unit 7 has an inverter control common unit (hereinafter, referred to as "common unit") 7a for driving a semiconductor element constituting the VVVF inverter 4b ', and supplies DC power to VV.
A VVVF control unit 7b for generating a drive signal for operating the semiconductor element so as to convert the DC power to VF AC power;
It comprises a CVCF control unit 7c for generating a drive signal for operating a semiconductor element so as to convert it to VCF AC power, and a switching unit 8 for controlling selector switches 81 to 84 described later.

A positive input terminal of a CVCF inverter 9 'is connected to the pantograph 1 via a circuit breaker 2c and a filter reactor 3c, and its negative input terminal is connected to a wheel GB.
1 and GB2. A filter capacitor 5a is connected between the positive input terminal and the negative input terminal of the CVCF inverter 9 ', and a transformer 11 is connected to the output terminal of the CVCF inverter 9' via a waveform filter circuit 10.
Primary side is connected. An auxiliary circuit 12 such as a control circuit for the VVVF inverters 4a 'and 4b', a circuit for air conditioning the inside of the vehicle, and a circuit for driving the electric air compressor 3 is connected to the secondary side of the transformer 11 as an auxiliary power supply load. Have been. In addition, the reactor 13 and the transformer 11, which are the electrical components constituting the waveform filter circuit 10, are both called scrolls, and may be integrated as a component configuration. Further, the common unit 7a and the VVVF control units 7b and C
A changeover switch 81 between the VCF controller 7c and the VCF
Switch 8 between inverter 4 b ′ and main motor 6
2, a changeover switch 83 between the CVCF inverter 9 'and the waveform filter circuit 10, and a VVVF inverter 4
A switch 84 is provided between the output terminal of the CVCF inverter 9 'and the output terminal of the CVCF inverter 9'.
1 to 84 are controlled by the switching unit 8 and operate in conjunction with each other.

In the conventional power converter having such a configuration, when the CVCF inverter 9 'fails, the switching unit 8 detects this and switches the switches 81 to 84 to the opposite side from the state shown in the figure. Operate. At this time, the circuit breaker 81 is opened. When the breaker 81 is opened, the CVC
F inverter 9 'is disconnected from waveform filter path 10,
Instead, a predetermined VVVF inverter 4b 'is
And connected to the waveform filter circuit 10 and, instead of the VVVF controller 7b, the CVCF controller 7
c is connected to the common unit 7a. Therefore, the VVVF inverter 4b 'operates as a CVCF inverter, and its output is supplied to the transformer 11 via the waveform filter circuit 10, and operates as an auxiliary power supply for the auxiliary circuit 12.

In this conventional example, two VVVF inverters and one CVCF inverter having the least number of conversion circuits have been described. However, in practice, four VVVF inverters and one CVCF inverter are adapted to the vehicle system. , 8 VVVF inverters and 1 CV
There is a system including a CF inverter.

For example, when a locomotive system employs a system capable of switching from a VVVF inverter to a CVCF inverter, a plurality of VVs corresponding to the number of axes of the locomotive are used.
Although a system is composed of a VF inverter and one CVCF inverter, a power-concentrated type system such as a locomotive has a large main motor capacity and processes heat loss generated from a power conversion circuit that controls the main motor. Usually employs a forced ventilation system using an electric blower.

FIG. 9 shows a conventional power converter in a locomotive system. In this conventional power converter, the equipment arrangement of the inverters 4a 'and 4b' is consolidated as much as possible to form power converters 4a "and 4b".
The cooling was performed by the electric blower (BL) 16 for each of a ″ and 4b ″.

[0010]

In the above conventional example, C
C of VVVF inverter due to failure of VCF inverter
Although the switching operation to the VCF inverter has been described, in the forced ventilation system, it is necessary to consider redundancy in consideration of failure of the electric blower. In other words, the electric blower has a rotating mechanism and is a component that requires maintenance, such as wear of bearings and necessity of refueling. To ensure the maximum redundancy as a locomotive system, the electric blower must be A system that does not stop the locomotive in the event of a breakdown is needed.

However, in the conventional power converter, the system has redundancy as described above with respect to the inverter failure. On the other hand, when the electric blower fails, not only the CVCF inverter but also the VVVF inverter cannot be cooled. In spite of the system having the switching function, there is a problem that the entire locomotive system must be stopped.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is not limited to a failure of an inverter but also to a failure of an electric blower. It is an object to provide a conversion device.

[0013]

According to the present invention, a plurality of groups of variable voltage variable frequency inverters used for a main power supply during normal operation and a group of constant voltage constant frequency inverters used for an auxiliary power supply are provided. A power conversion device that disconnects the constant voltage constant frequency inverter when an abnormality occurs, switches one group of the variable voltage variable frequency inverters to a constant voltage constant frequency inverter, and operates for an auxiliary power supply. A plurality of circuit elements constituting the inverters are forcibly ventilated and cooled by sharing the electric blowers, and the constant voltage / constant frequency inverter used for the auxiliary power supply during the normal operation and the auxiliary power supply for the switching operation. The variable voltage variable frequency inverter and the variable voltage inverter are arranged to be cooled by separate electric blowers.

In the power converter according to the first aspect of the present invention, the CV
In the event of failure of the electric blower that is forcibly ventilating the CF inverter, the circuit elements of the inverter converter cannot be cooled, so it is necessary to disconnect the inverter that was performing forced ventilation with the electric blower. VVVF Inverter is disconnected from the system and VVV
One of the F inverters is switched to the CVCF inverter for operation. At this time, since the switched VVVF inverter is supplied with forced ventilation from a separate electric blower, there is no redundancy for failure of the electric blower. Secured.

[0015] The invention according to claim 2 comprises a plurality of groups of variable voltage variable frequency inverters used for a main power supply during normal operation;
A group of constant-voltage / constant-frequency inverters used for an auxiliary power supply; disconnecting the constant-voltage / constant-frequency inverter when an abnormality occurs; In a power converter that is switched to operate for an auxiliary power supply, forced ventilation cooling is performed on a circuit element constituting a large number of groups of inverters shared by a plurality of electric blowers, and each of the electric blowers has the same number of the above-described electric blowers. A variable voltage variable frequency inverter performs forced ventilation, and one of the electric blowers also performs forced ventilation on the constant voltage constant frequency inverter, and a variable voltage variable frequency inverter cooled by another electric blower different from the electric blower. In the switching operation, the switching to the constant voltage constant frequency inverter is performed for the auxiliary power supply.

In the power converter according to the second aspect of the present invention, the CV
In the event of failure of the electric blower forcibly ventilating the CF inverter, the CVCF cooled by the electric blower
The inverter and several groups of VVVF inverters are disconnected from the system and the V cooled by another electric blower
Since one group of the VVF inverters is operated by switching to the CVCF inverter, redundancy against failure of the electric blower is ensured. In addition, since the same number of VVVF inverters are forcibly ventilated by each electric blower, a plurality of electric blowers having the same performance can be prevented from increasing in number. Note that C
Strictly speaking, an electric blower that also performs forced ventilation for a VCF inverter requires a large amount of cooling air.
Taking into account the ventilation of the locomotive equipment room, it is possible to use a plurality of the same electric blowers.

The invention according to claim 3 is a plurality of groups of variable voltage variable frequency inverters used for a main power supply during normal operation,
A group of constant-voltage / constant-frequency inverters used for an auxiliary power supply; disconnecting the constant-voltage / constant-frequency inverter when an abnormality occurs; In a power converter that is switched to operate for an auxiliary power supply, forced ventilation cooling is performed on a plurality of circuit elements constituting the inverters, which are shared by a plurality of electric blowers, and each of the electric blowers has the same number of the variable blowers. It is characterized in that forced ventilation is performed to the voltage variable frequency inverter, and forced ventilation is performed in parallel to the constant voltage and constant frequency inverter from two of the electric blowers in parallel.

In the power converter according to the third aspect of the present invention, as with the power converter according to the second aspect of the present invention, a plurality of electric blowers are standardized, but an extra CVCF inverter is required on the electric blower side. Since the amount of cooling air is shared by the two electric blowers, it is easier to share with other electric blowers. The airflow is reduced by half due to the failure of one of the two electric blowers that perform forced ventilation to the CVCF inverter. However, since the electric blower is operated with the output of the CVCF inverter, the load itself is reduced, and the CVCF is reduced.
Since the heat loss generated from the CF inverter is also reduced, the switching operation itself due to the failure of the electric blower becomes unnecessary.

A fourth aspect of the present invention is directed to a plurality of groups of variable voltage variable frequency inverters used for a main power supply during normal operation,
A group of constant-voltage / constant-frequency inverters used for an auxiliary power supply; disconnecting the constant-voltage / constant-frequency inverter when an abnormality occurs; In a power converter that is switched to operate for an auxiliary power supply, forced ventilation cooling is performed on a plurality of circuit elements constituting the inverters, which are shared by a plurality of electric blowers, and each of the electric blowers has the same number of the variable blowers. The variable voltage frequency inverter performs forced ventilation, a reactor connected between the output of the inverter conversion unit in the constant voltage constant frequency inverter and an external load circuit, a winding of a transformer, etc., of the electric blower Forcibly ventilating the two components in parallel from each other, and cooling the semiconductor element of the inverter conversion section of the constant voltage / constant frequency inverter by the electric transmission It is characterized in that the arrangement for forced draft from one machine.

In the power converter according to the fourth aspect of the present invention, the CV
In the event of failure of the electric blower that is performing forced ventilation to cool the circuit elements of the inverter converter of the CF inverter, a group of VVVF inverters that are performing forced ventilation with the electrically operating blower are operating properly. Switching to the CVCF inverter ensures redundancy against failure of the electric blower as in the power converter of the first or second aspect of the present invention.
Considering cooling of windings such as reactors and transformers, which constitute circuit elements of the CVCF inverter, the cooling air to these windings will be reduced by half due to failure of the electric blower. The load itself can be cooled by reducing the load itself.In addition, the roll has a high thermal time constant, and it takes time for half of the air volume to appear as a difference in temperature rise. Considering that it is determined from the life of the insulation instead of being rapidly destroyed at that temperature as in the case of the semiconductor device described above, there is no problem in the switching operation until the failed electric blower is replaced.

According to a fifth aspect of the present invention, in the power converter of the first to fourth aspects, a reactor, a transformer, or the like connected between an output of an inverter converter of the constant voltage / constant frequency inverter and an external load circuit is provided. The scroll is characterized by being arranged so that natural ventilation is performed without using forced ventilation by the electric blower.Redundancy against failure of the electric blower can be achieved by only cooling the semiconductor element of the inverter converter. Just as with the power converter according to the first to fourth aspects of the present invention, the switching operation of the VVVF inverter to the CVCF inverter can ensure redundancy.

According to a sixth aspect of the present invention, in the power converter of the first to fifth aspects, the inverter is installed in a floor equipment room of a locomotive, and the electric blower is connected to an output of each inverter. It is characterized by being arranged to also serve as an electric blower that cools the driving main motor, and also performs forced ventilation on the power conversion device side with an electric blower for cooling the large capacity main motor of the locomotive, The required number of electric blowers can be optimized for the locomotive system as a whole.

According to a seventh aspect of the present invention, in the power converter of the sixth aspect, the inverter conversion section of the constant voltage / constant frequency inverter and windings such as a reactor and a transformer are housed in separate housings. The housing that stores
A plurality of groups of variable voltage variable frequency inverters are installed in the equipment room on the floor of the locomotive together with the variable voltage variable frequency inverters, and the concealment body for storing the reactor, transformer, and the like is installed in a portion communicating with the outside air under the floor of the locomotive. Yes, cooling of reactors, transformers, and other scrolls by natural ventilation is the same as the power conversion device of the invention of claim 5, but by installing this under the vehicle floor, heat can be efficiently discharged to the outside air, Since there is also a ventilation effect by running the vehicle, it is possible to reduce the size and weight of scrolls such as reactors and transformers.

According to an eighth aspect of the present invention, in the power converter according to the third or fourth aspect, the inverter is installed in a floor equipment room of a locomotive, and the electric blower is connected to an output of each inverter. The driving main motor is also used as an electric blower for cooling, and the constant-voltage / constant-frequency inverter or the scrolls such as the reactor and the transformer are arranged almost at the center of the two electric blowers for cooling the same. In order to take in the same amount of cooling air from two electric blowers in parallel, it is necessary to prevent mutual influence at the part where the cooling air merges. By setting the center as the portion where the cooling air merges, the shape of the cooling wind tunnel from the electric blower to the junction can be adjusted, and the air volume can be easily adjusted.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

<First Embodiment> FIG. 1 is a block diagram of a power converter according to a first embodiment of the present invention. The power converter according to this embodiment includes four or more groups of VVVF inverters 4a 'used for driving railway vehicles (one group of which is a VVVF inverter used as a CVCF inverter).
An inverter 4b '(including VVVF / SIV)) and a group of CVCF inverters 9' used for power supply;
There are provided a group of changeover switches 81 to 84 for electrically switching between the VVF inverter and the CVCF inverter. Also,
Two electric blowers (BL) 15a, 15b for cooling the inverter converters 4a, 4b, 9 and the transformer reactor of the CVCF inverter 9 'are arranged (this system is called "dual mode").

The components denoted by the same reference numerals as those of the conventional system shown in FIGS. 8 and 9 are the same as those of the conventional example. For example, 1 is a pantograph, 6 is a main motor, 10 is a waveform filter circuit (in this circuit, a reactor 13 is provided as in the conventional example), 11 is a transformer, 12 is an auxiliary circuit, and 17a and 17b are ventilation ducts. , 1
Reference numerals 8a and 18b denote wind flows, and reference numeral 20 denotes a locomotive.

As a ventilation system of the electric blower BL group,
The system of the BL15b includes a system that normally operates as the CVCF inverter 9 ', and the system of the other BL15b.
The system a includes a VVVF inverter 4b 'that functions as a CVCF inverter after being electrically switched, and that normally operates as a VVVF inverter. In this case, CVCF inverter 9 'is arranged near the center of the vehicle.

As described above, the ventilation system for blowing the VVVF inverter 4b 'switched in the dual mode is provided separately from the CVCF inverter 9'.
Even if it is electrically sound, when the electric blower 15b on the ventilation system of the CVCF inverter 9 'fails, the VVV
For V inverter 4b ', VVVF inverter → CV
By switching the CF inverter, this VV
The VF inverter 9 'can continue to operate as a power supply inverter (SIV) and provide services. That is, the redundancy of the power supply system and the redundancy and stability of the locomotive system can be secured. Further, by disposing the CVCF inverter 9 'near the center of the vehicle, the ventilation from the two electric blowers 15a and 15b becomes substantially symmetrical, and the cooling air tunnel shape can be matched, and the air volume can be easily adjusted.

<Second Embodiment> FIG. 2 shows a second embodiment of the present invention. The power converter of this embodiment is different from the first embodiment in that the power Blower (B
L) The number of 16 'is four, and the four electric blowers have the same performance. In addition,
In FIG. 2, the same reference numerals as those in the first embodiment shown in FIG. 1 indicate the common elements.

Although the electric blower 16 'forcibly ventilating the CVCF inverter 9' requires a large amount of cooling air to be strictly, the cooling air flow to the object to be cooled and the locomotive equipment room, which are not described here, is large. Taking into account the ventilation and the like, an electric blower of the same specification can sufficiently cope with it.

Thus, according to the second embodiment,
As in the first embodiment, the redundancy and stability of the locomotive system can be ensured, and the standardization can be promoted without increasing the types of electric blowers, and the efficiency of maintenance can be improved. It is possible.

<Third Embodiment> FIG. 3 shows a power converter according to a third embodiment of the present invention. In this embodiment, the CVCF inverter 9 'in the first embodiment is shown. Ventilation to two electric blowers (BL) 16a, 1
6b in parallel. In addition, electric blowers having the same performance are used for the two BLs 16a and 16b as in the second embodiment, and standardization is also possible at the same time. In FIG. 3, the same reference numerals as those in the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 2 indicate the same elements.

In the third embodiment, the cooling air volume of the CVCF inverter is shared by the two electric blowers 16a and 16b, but when one of them breaks down, only the other healthy one is used. To ventilate.

As a result, the ventilation amount is reduced by half, but the CVC
Since the electric blower is operated as the load of the F inverter 9 ', the load itself is reduced and the generated heat loss is also reduced, so that there is no major obstacle to the cooling system. That is, the electric blower 1
In the event that one out of two of the six fails, the CVCF inverter 9 'can continue to operate without switching to the other VVVF inverter 4b', thereby ensuring the redundancy of the power supply system. This means that the redundancy and stability of the locomotive system can be ensured. Further, by disposing the CVCF inverter 9 'near the center of the vehicle, the ventilation duct viewed from the electric blower 16 is completely symmetrical in the third embodiment, and the air volume is further increased as compared with the first embodiment. Adjustment is easy, which greatly contributes to the standardization of wind tunnel production.

<Fourth Embodiment> FIG. 4 shows a power converter according to a fourth embodiment of the present invention. As in the third embodiment, ventilation to the CVCF inverter 9 'is controlled. 2
The electric blowers (BL) 16a and 16b are used in parallel, and the reactor and the transformer in the waveform filter circuit 10 connected between the output of the CVCF inverter 9 'and the load circuit during the ventilation of the CVCF inverter 9'. 11 and the inverter converter 9 are largely divided into two parts, and the scrolls are forcedly ventilated in parallel from the two electric blowers 16a and 16b.
It is characterized in that forced ventilation is performed by the electric blowers 16a. It should be noted that in FIG.
The same reference numerals as those in the first embodiment denote the same elements. 17c and 17c 'are ventilation ducts for the reactor and transformer, and 17d is a duct for the CVCF converter.

According to this, when the electric blower (BL) 16b of the ventilation system including the CVCF inverter 9 'fails, as in the first and second embodiments, the other BL16
It is necessary to switch the VVVF inverter 4b 'forcedly ventilated by a to the CVCF inverter, and the cooling air to the windings such as the reactor and the transformer 11 in the waveform filter circuit 10 is reduced to half by the failure of the electric blower. As in the third embodiment, since the load itself is reduced, the scroll can be cooled. In addition, the thermal time constant is high, and it takes time for the halving of the air volume to appear as a difference in temperature rise, and the allowable temperature of the scroll is not abruptly destroyed at that temperature like a semiconductor element, but the life of insulation. In consideration of this, there is no problem in continuing the operation by forced ventilation cooling by one BL 16a. Therefore,
Redundancy can be ensured as in the third embodiment.

In the third and fourth embodiments, the inverters 4a ', 4b', 9 'are installed in the equipment room on the floor of the locomotive, and the electric blowers 16a, 16b are
The output of each inverter is connected to an electric blower that cools the main motor 6 for driving the vehicle.
Scrolls such as the F inverter 9 'or the reactor and the transformer 11 can be arranged substantially at the center of the two electric blowers 16a and 16b for cooling the same.

In order to take in the same amount of cooling air from the two electric blowers 16a and 16b in parallel, it is necessary to prevent mutual influence at the portion where the cooling air merges.
With the above configuration, two electric blowers 16
Substantially the center of a and 16b can be a portion where the cooling air merges, and the shape of the cooling wind tunnel from the electric blower to the merging portion can be adjusted, thereby facilitating air volume adjustment.

<Fifth Embodiment> FIG. 5 shows a power converter according to a fifth embodiment of the present invention.
Waveform filter circuit 10 as performed in the first embodiment.
It is characterized in that a natural ventilation system is used instead of forced ventilation by an electric blower for cooling the inside of the reactor or a scroll such as the transformer 11.

With such a configuration, the redundancy against the failure of the electric blower only needs to consider the cooling of the semiconductor element, the redundancy can be more easily ensured, and the reliability of the system can be further improved. That is, the redundancy of the power supply system and the locomotive system can be made equal to or more than that of the first to fourth embodiments,
System reliability is improved.

<Sixth Embodiment> FIG. 6 shows a power converter according to a sixth embodiment of the present invention.
In the embodiment, the power converter is installed in the equipment room above the floor of the locomotive 20, and the electric blowers 16 a and 16 b for cooling the power converter are provided with a vehicle drive main unit to which the output of each power converter is connected. The electric motor 6 is also used as an electric blower for cooling the electric motor 6.

Thus, according to the present embodiment, the required number of electric blowers can be optimized for the locomotive system as a whole. It can be secured without any difference from the fifth embodiment. Furthermore, by consolidating and standardizing the electric blower, a more compact and optimal locomotive system can be obtained.

<Seventh Embodiment> FIG. 7 shows a power converter according to a seventh embodiment of the present invention. The housing containing the reactor in the waveform filter circuit 10 and a scroll such as the transformer 11 is mounted on the locomotive 2.
It is characterized in that it is installed in a part below the floor where it communicates with the outside air. The natural ventilation cooling for these scrolls is the same as that of the fifth embodiment, but since it is under the floor of the vehicle, the heat can be efficiently discharged and the vehicle has a ventilation effect. , Weight reduction becomes possible. The redundancy is equivalent to that of the fifth embodiment.

[0045]

As described above, according to the present invention, the redundancy of the power supply system in the event of a failure of the electric blower can be ensured, and the redundancy and stability of the entire system can be ensured.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power converter according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a power converter according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a power conversion device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a power conversion device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram of a power conversion device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram of a power converter according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram of a power conversion device according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram of a conventional electric system system.

FIG. 9 is a block diagram of a conventional power converter.

[Explanation of symbols]

 1: Pantograph 4a, 4b: VVVF inverter converter 4a ', 4b': VVVF inverter 6: Main motor 9: CVCF inverter converter 9 ': CVCF inverter 10: Waveform filter circuit 11: Transformer 12: Auxiliary circuit 15a, 15b: Electric blowers 16 ', 16a, 16b: Electric blowers 17a, 17b: Ventilation ducts 17c, 17c': Ventilation ducts for reactors and transformers 17d: Ducts for CVCF converters 18a, 18b: Wind flow 19: Running wind (locomotive air) 20: Locomotive

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masahiko Kanda 2-24-24 Harumi-cho, Fuchu-shi, Tokyo Toshiba Transport Engineering Stock Company In-house (72) Inventor Yoshihiro Yamaguchi 1-Toshiba-cho, Fuchu-shi, Tokyo 5H007 AA06 BB06 CC03 CC32 FA13 FA19 GA09 HA02 HA05 HA06 5H115 PA14 PC02 PG01 PI03 PI29 PI30 PU08 PV09 QA01 QA10 TR01 TW10 TZ04 TZ14 UI28 UI29 UI34

Claims (8)

[Claims] 1. A normal voltage operation comprising a plurality of groups of variable voltage variable frequency inverters used for a main power supply during normal operation and a group of constant voltage constant frequency inverters used for an auxiliary power supply. When an abnormality occurs, the inverter is disconnected and a group of the variable voltage variable frequency inverters is switched to a constant voltage constant frequency inverter to operate for an auxiliary power supply. The constant voltage constant frequency inverter used for auxiliary power supply during normal operation by forcibly ventilation cooling circuit elements constituting the inverter,
A power converter, wherein the variable voltage variable frequency inverter used for an auxiliary power supply in the switching operation is cooled by a separate electric blower. 2. A normal voltage operation comprising a plurality of groups of variable voltage variable frequency inverters used for a main power supply and a group of constant voltage constant frequency inverters used for an auxiliary power supply. When an abnormality occurs, the inverter is separated, and one of the variable voltage variable frequency inverters is switched to a constant voltage constant frequency inverter to operate for an auxiliary power supply. Perform forced ventilation cooling on circuit elements constituting the inverter, each of the electric blowers performs forced ventilation on the same number of the variable voltage variable frequency inverters, and one of the electric blowers is supplied with the constant voltage / constant frequency inverter. Also performs forced ventilation, and switches the variable voltage variable frequency inverter, which is cooled by an electric blower different from the electric blower, Power conversion device is characterized in that the arrangement for switching the constant-voltage constant-frequency inverter as use. 3. A constant voltage constant frequency inverter comprising a plurality of groups of variable voltage variable frequency inverters used for a main power supply during normal operation and a group of constant voltage constant frequency inverters used for an auxiliary power supply. When an abnormality occurs, the inverter is separated, and one of the variable voltage variable frequency inverters is switched to a constant voltage constant frequency inverter to operate for an auxiliary power supply. The forced ventilation cooling is performed on the circuit elements constituting the inverter, each of the electric blowers performs forced ventilation on the same number of the variable voltage variable frequency inverters, and the constant voltage constant is performed in parallel from two of the electric blowers. An electric power converter, wherein forced air is passed through a frequency inverter. 4. A normal voltage operation comprising a plurality of groups of variable voltage variable frequency inverters used for a main power supply and a group of constant voltage constant frequency inverters used for an auxiliary power supply. When an abnormality occurs, the inverter is separated, and one of the variable voltage variable frequency inverters is switched to a constant voltage constant frequency inverter to operate for an auxiliary power supply. The forced ventilation cooling is performed on the circuit elements constituting the inverter, each of the electric blowers performs forced ventilation on the same number of the variable voltage variable frequency inverters, and the output of the inverter conversion unit in the constant voltage constant frequency inverter and the external Scrolls such as reactors and transformers connected to the load circuit are connected to forced ventilation from two of the electric blowers in parallel. , Wherein the cooling of the semiconductor element of the inverter conversion unit of the constant-voltage constant-frequency inverters, power conversion device is characterized in that the arrangement for forced draft from one of said electric blower. 5. A winding such as a reactor or a transformer connected between an output of an inverter conversion unit of the constant-voltage / constant-frequency inverter and an external load circuit does not use forced ventilation by the electric blower. The power converter according to any one of claims 1 to 4, wherein the power converter is arranged to perform the following. 6. The inverter is installed in a floor equipment room of a locomotive, and the electric blowers are arranged so as to also serve as electric blowers for cooling a vehicle drive main motor to which outputs of the respective inverters are connected. Claims 1 to
6. The power converter according to any one of 5. 7. A housing for housing the inverter converter of the constant voltage / constant frequency inverter and scrolls such as reactors and transformers in a separate housing, wherein the housing for housing the inverter converter comprises a plurality of groups of the variable voltage variable units. 7. The power converter according to claim 6, wherein the power converter is installed in a locomotive floor equipment room together with a frequency inverter, and the concealment body that stores the reactor, the transformer, and the like is installed in a portion that communicates with outside air under the locomotive floor. . 8. The inverter is installed in a floor equipment room of a locomotive, and the electric blower is also used as an electric blower for cooling a main motor for driving a vehicle to which an output of each inverter is connected. The power converter according to claim 3 or 4, wherein a winding such as a voltage constant frequency inverter or a reactor or a transformer is disposed substantially at the center of two electric blowers for cooling the same.