JPH0698414A - System for feeding superconducting magnetic levitation type railroad - Google Patents

Abstract

PURPOSE:To adopt a four-phase propulsion system and to enable enlargement of a pole pitch without changing a truck length. CONSTITUTION:While 1 and 2, and 3 and 4, are of the same phase and connected in series respectively and the points of connection thereof are grounded, the phases of (1, 2) and (3, 4) are different at an angle of 90 degrees from each other and they construct a two-phase power converter for feeding, as a whole. Four coils of 17 to 20 constitute a unit of ground coils for propulsion and the coils 17 and 19, and 18 and 20, are connected in series respectively so that they have reverse polarities to each other. The four coils furnish four-phase propulsion in which they have sequential phase differences of 90 degrees in the sequence of arrangement when they are fed, and a magnet on a vehicle is subjected to a prescribed propulsion which is unvaried. While a pole pitch of the ground coil is made larger than the one in the case of three-phase feeding, the pole pitch of a system on the vehicle can also be enlarged without changing a truck length, since the number of poles of the system on the vehicle may be odd. Since four-phase propulsion by two-phase feeding is adopted, a flexible design corresponding to a load, cost reduction, etc., can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeder system adopted in a so-called primary ground type superconducting magnetic levitation railway.

[0002]

2. Description of the Related Art In a ground-based primary type superconducting magnetically levitated railway, a propulsion ground coil laid on the side wall or floor of a taxiway of a railway vehicle is powered by a power converter for feeding, and superconducting on the vehicle. A railway vehicle equipped with a magnet is driven to levitate, and as a feeding system for a ground coil for propulsion in this type of railway, a three-phase feeding system shown in, for example, FIG. 6 is conventionally known.

In FIG. 6, reference numerals 61, 62 and 63 respectively denote single-phase power converters composed of cycloconverters, which have a phase difference of 120 degrees with each other, and one ends thereof are commonly connected and grounded. . That is, the three single-phase power converters 61 to 63 constitute a three-phase feeder power converter as a whole and are set in the substation, but each phase output and the common ground terminal (so-called neutral point ) Are circuit breakers (64-6
7) and is connected to one end of the feeder line (68 to 71).

The other ends of these feeder lines (68 to 71) are laid and extended from the substation into the guideway of the railway vehicle as the outgoing and return electrical lines, respectively, on the way. Is a predetermined interval (interval of feeding control),
At one end of the section (substation side), a forward circuit breaker (72 to 7)
4) is set and the return circuit breaker 75 is set at the other end.

Further, a ground coil for propulsion is laid on the side wall surface or floor surface of the taxiway of the railway vehicle. This coil is composed of three coils (76 to 78) as a unit, In the section, coils corresponding to the order of arrangement in each unit are connected in series, and one end (substation side) is connected to the forward circuit breaker (72 to 74) via the corresponding forward circuit (68 to 74). 70), and the other end is commonly connected to the return electric line 71 via the return circuit breaker 75.

In short, the conventional feeding system has three feeding phases (FIG. 7), and the power converters for each phase are three.
In this system, the phase current (80 to 82) corresponding to the phase feeding current is fed to the corresponding series coil system of the propulsion ground coil (76 series system to 78 series system).

The superconducting magnet is mounted on a bogie of a railway vehicle, and its pole pitch is equal to that of the ground coil for propulsion, and it is on both sides orthogonal to the traveling direction of the bogie to reduce the pulsation of propulsive force. An even number (poles), for example, four (poles) are arranged.

[0008]

By the way, in the superconducting magnetic levitation railway of the primary ground type, there are various problems regarding the ground coil for propulsion. One of them is, for example, in a ground coil for propulsion, a magnetic drag force is generated. However, since this causes a running resistance, its generation can be suppressed. This magnetic drag is caused by eddy current loss, copper loss, etc. Since the eddy current loss is almost proportional to the square of the frequency, the magnetic force caused by the eddy current loss can be reduced if the feeding frequency during running can be lowered. The drag can be reduced. This can be solved by increasing the pole pitch.

However, since the conventional three-phase feeding system is adopted, there is a problem that it is difficult to increase the pole pitch. That is, when increasing the pole pitch of the ground system, it is necessary to expand the on-board system as well, but if the bogie is made longer, the ratio of the bogie weight to the vehicle weight becomes excessive, and the ratio of the bogie length to the train length There is a certain limit on the length of the bogie due to the realistic configuration of the vehicle, such as when the vehicle becomes excessively large.

Therefore, the number of superconducting magnets set on both sides orthogonal to the traveling direction of the carriage is reduced without changing the carriage length to change the present even poles to odd poles. There is no other way than to reduce from three poles to three poles. However, doing so is not appropriate because the fluctuation of the propulsion force increases and the magnetic influence on the super-electric magnet increases.

Further, reducing the magnetic influence of the ground coil for propulsion on the superconducting magnet is one of the problems.
In the three-phase feeding system, a vertical force is generated in a direction orthogonal to the propulsion direction in addition to the above-described fluctuation of the propulsion force, but there is a problem that it is difficult to reduce these.

Although a two-layer arrangement structure is adopted as a measure for reducing the above-mentioned vertical force, it causes a cost increase. Further, the three-phase feeding system has a problem that the number of cables and the number of crossover wires laid in the vehicle taxiway are large and material costs and labor costs increase. In other words, improving the price / performance ratio of the ground coil for propulsion is also one of the challenges.

An object of the present invention is to make it possible to expand the pole pitch without changing the carriage length, to reduce the magnetic influence on the superconducting magnet, and to improve the price / performance ratio. It is to provide a feeder system for the levitation railway.

[0014]

In order to achieve the above object, the feeding system of the superconducting magnetic levitation railway of the present invention has the following constitution. That is, the feeding system of the superconducting magnetic levitation railway of the first invention is a superconducting magnetic levitation type in which a ground coil for propulsion is fed from a power converter for feeding and a railway vehicle equipped with a superconducting magnet is levitated. In railways: the propulsion ground coil is composed of four coils as a unit,
The coils in each unit are 90 in order according to the order of arrangement.
It is characterized by the fact that it is received with a phase shifted to the degree.

A feeding system of a superconducting magnetic levitation railway according to a second aspect of the present invention is a superconducting magnetic levitation system in which a propulsion ground coil is fed from a feeding power converter to levitate a railway vehicle equipped with a superconducting magnet. In the railway, the power converter for feeding is two sets of combination converters in which two single-phase power converters of the same phase are connected in series and the connection point is grounded, and the phases are 90 degrees each other. The propulsion ground coil is composed of four coils as a unit, and the coils in each unit are arranged in order of the first coil, the second coil, and the second coil. 3 coils, 4th
If the coil is used, the first coil and the third coil and the second coil and the fourth coil are connected in series so as to have opposite polarities, and the series coil system of the first coil and the third coil is the first combination. Is fed from the converter, and the series coil system of the second coil and the fourth coil is fed from the second combination converter.

The feeding system of the superconducting magnetic levitation railway according to the third aspect of the present invention is a superconducting system in which a propulsion ground coil is fed from a feeding power converter to levitate a railway vehicle equipped with a superconducting magnet. In a magnetically levitated railway; the power converter for feeders comprises a combination converter in which two single-phase power converters whose phases are different from each other by 90 degrees are connected and the connection point is grounded; The coil is composed of four coils as a unit. If the coils in each unit are a first coil, a second coil, a third coil, and a fourth coil in the order of arrangement, the first coil, the third coil, and The second coil and the fourth coil are connected in series so as to have opposite polarities, and the system of each series coil is fed from the combination converter with its ground end as a common return path. is there.

[0017]

Next, the operation of the feeding system of the superconducting magnetic levitation railway of the present invention constructed as described above will be described. In the present invention, a four-phase feeding method is adopted in which the ground coil for propulsion is configured with four coils as a unit, and the coils in each unit are sequentially shifted in phase by 90 degrees in accordance with the order of arrangement (first). 1 invention).

As a result, the pole pitch of the ground system naturally expands, but the fluctuation of the propulsive force can be greatly reduced, so that the number of poles on one side per bogie can be made odd in the on-board system. Specifically, the number of poles on one side can be reduced from four to three, and the on-vehicle pole pitch can be increased corresponding to the increase of the ground pole pitch without changing the bogie length.

As a result, the magnetic resistance can be reduced, and it is possible to save power and reduce the cost of the ground coil for propulsion. In addition, since the on-vehicle magnets are given the same propulsive force without fluctuations in propulsive force, and the vertical force can be reduced, mechanical disturbance to the superconducting magnet can be reduced and reliability and durability of the superconducting magnet are greatly improved. To do.

Specifically, for example, the second invention and the third invention
Since it can be configured as in the invention, the propulsion ground coil is propelled in four phases, but the feeding system of the substation can be made into a two-phase feeding having a phase difference of substantially 90 degrees, and the feeding power can be reduced. Not only can the control part of the converter be simplified from three-phase to two-phase, but the number of cables and crossover wires laid in the vehicle taxiway can be significantly reduced, and the price-performance ratio of the ground coil for propulsion can be improved.

The second invention is a constitutional example suitable for a long knitting growth distance, and the third invention is a constitutional example suitable for a short knitting short distance. The feeder system can be appropriately configured according to the weight of the load, and the feeder system suitable for the superconducting magnetic levitation railway can be realized without impairing the economical efficiency and maintainability.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a feeding system of a superconducting magnetic levitation railway according to an embodiment of the present invention. The system of the first embodiment is an example of a configuration suitable for a long growth distance. In FIG. 1, 1 and 2
And 3 and 4 constitute a power converter for feeding as a whole, they are single-phase power converters, and are 1 to 2 and 3 respectively.
And 4 are connected in series in the same phase, and the connection point is grounded. The first combination converter (1, 2) and the second combination converter (3, 4) are out of phase with each other by 90 degrees. That is, this power converter for feeding is a two-phase power converter having a phase difference of 90 degrees.

Each of the single-phase power converters (1 to 4) may be composed of a cycloconverter as in the conventional case, but in the present embodiment, the GT is used because an arbitrary waveform can be formed.
It is composed of an O inverter.

Numerals 5 to 8 are circuit breakers set at the outlets of the substations. In the first combination converter (1, 2), the output end is connected to one end of the feeder line 9 via the breaker 5, and the input end is connected to one end of the feeder line 10 via the breaker 6. In the combination converter (3, 4) of No. 2, the output end is connected to one end of feeder line 11 via breaker 7, and the input end is connected to one end of feeder line 12 via breaker 8.

The other ends of these feeder lines (9 to 12) are
Each of them is laid as a forward and return electric line from the substation into the taxiway of the railway vehicle, with a predetermined interval (interval interval for feeding control) in the middle of that line. The forward circuit breakers (13, 14) are set at one end (substation side) of the and the return circuit breakers (15, 16) are set at the other end.

A ground coil for propulsion is laid on the side wall or floor of the taxiway of the railway vehicle. This is composed of four coils (17 to 20) as a unit, and if the four coils are arranged in the order of 17, 18, 19, and 20, then 17 and 19 and 18 and 20 respectively. The coils are connected in series so as to have opposite polarities, and the corresponding series coils are connected in series with each unit maintaining this relationship in the feeding control section.

The system of the series coils of 17 and 19 is
One end (substation side) is connected to the outgoing circuit line 9 via the outward circuit breaker 14, and the other end is connected to the return circuit line 10 via the return circuit breaker 15. Further, in the series coil system of 18 and 20, one end (substation side) is connected to the outgoing circuit breaker 13 and is connected to the outgoing circuit line 11, and the other end is connected to the outgoing circuit line 12 via the return circuit breaker 16. Connected.

Therefore, the number of connecting lines to the adjacent ground coil for propulsion is reduced from the conventional three to two, and the number of crossovers is also reduced. Also, the series coil system of 17 and 19 is fed from the first combination converter (1, 2), and the series coil system of 18 and 20 is fed from the second combination converter (3, 4). However, since the connection points of the first and second combination converters are grounded, the ground voltage of this propulsion ground coil is half the applied voltage, which is advantageous in terms of withstand voltage.

As is apparent from the above construction, in the propulsion ground coil, the series coil system of 17 and 19 is fed from the first combination converter (1, 2), and the series coil system of 18 and 20 is supplied. Is a two-phase feeding system in which electricity is fed from the second combination converter (3, 4), but since 17 and 19 and 18 and 20 have opposite polarities respectively, four coils are 90 It is a four-phase propulsion system in which different phases are used to generate electricity.

Specifically, for example, FIG. 2 is a vector diagram of the feeding current used in the four-phase propulsion system, but the first combination converter (1, 2) can feed the feeding current vector 25, Second combination converter (3, 4) feeding current vectors 25 and 9
Assuming that the feeding current vector 26 having a phase difference of 0 degree can be generated, the coil 17 is fed by the feeding current vector 25, the coil 18 is fed by the feeding current vector 26, and the coil 19 is fed by each unit of the ground coil for propulsion. The current vector 27 is supplied, and the coil 20 is supplied with a feeding current vector 28. As a result, a moving magnetic field that advances in the coil arrangement direction is formed as in the three-phase feeding system, and the vehicle can be levitated (FIGS. 3 and 4).

FIGS. 3 and 4 show the propulsion ground coils (17 to 17) when the propulsion ground coils are arranged on the side wall surface of the taxiway.
20) and one superconducting magnet 30 on the dolly as viewed from above. The notation of the coil end (・
Signs and crosses are generally used to indicate the direction of current. That is, the-mark indicates that the direction of the electric current is from the back of the paper to the front of the paper, and the cross indicates that the direction of the current is from the front of the paper to the back of the paper. Since both the ground system coil and the onboard system coil are rectangular, the direction of the current flowing through the coil side perpendicular to the floor surface of the taxiway is shown in the illustrated example.

In FIG. 3, the superconducting magnet 30 is located at a position where it extends between 18 and 19 of the ground coil for propulsion, and generates a magnetic field toward the ground coil for propulsion as indicated by the solid arrow. On the other hand, the ground coils for propulsion are 17, 18, 19, 2
A feeding current having a phase difference of 90 degrees flows in the order of 0, but the coil 18 generates a magnetic field toward the superconducting magnet side in a phase delayed by 90 degrees from the feeding current 17, and thus faces the inner coil 18 of the superconducting magnet 30. The part receives repulsive force. Further, since the coil 19 generates a magnetic field in the same direction as the magnetic field generated by the superconducting magnet 30 in a phase delayed by 90 degrees from the coil 18, the portion of the superconducting magnet 30 facing the inner coil 19 receives an attractive force. As a result, the superconducting magnet 30 receives the propulsive force in the right direction in the figure, moves to the right, and becomes the state of FIG. 4, and the next coil 20 is separated from the coil 19 by the magnetic field generated by the superconducting magnet 30 in a phase delayed by 90 degrees. Since the magnetic field in the same direction is generated, the superconducting magnet 30 receives the attractive force from the coil 20, moves further to the right, and receives the action of the adjacent ground coil for propulsion.

Since the four-phase propulsion is used, it can be understood that the fluctuation of the propulsive force is greatly reduced as compared with the conventional three-phase propulsion, and the thrust of each superconducting magnet is always a constant value.

Since the ground coil for propulsion is composed of four coils, the total length of the coil sides parallel to the floor surface of these four coils is one cycle electrically. However, the pole pitch is naturally wider than in the conventional three-phase propulsion system. Therefore, the pole pitch of the on-vehicle system also needs to be increased, but it is not a good idea to increase the length of the bogie as described above.

However, in the four-phase propulsion system, the fluctuation of the propulsive force is significantly reduced as compared with the conventional three-phase propulsion system. Therefore, the number of superconducting magnets on the carriage need not be an even number on one side, but an odd number on one side. Becomes Therefore, the pole pitch of the on-board system can be expanded without changing the bogie length.

Specifically, in the on-vehicle system, the number of superconducting magnets on one side of the bogie is reduced from four to three.
As shown in FIG. 3, the lengths of the parallel coil sides of the three superconducting magnets are set longer than the lengths of the parallel coil sides of the ground system.

Further, in each of the vertical coil sides of the ground coil for propulsion, a force (vertical force) in a direction perpendicular to the propulsion direction is generated, but this is in combination with the fact that the number of magnetic poles on one side per carriage is an odd number. Therefore, the vertical force can be reduced to a level where there is no problem by simply arranging the vertical coil sides close to each other without using a two-layer arrangement structure as in the conventional art, and therefore, the magnetic effect on the superconducting magnet is greatly reduced. Is reduced to.

When the propulsion ground coil is arranged on the side wall surface of the taxiway, the number of crossover wires between the side wall surfaces is significantly reduced as compared with the conventional one, and the wiring of the propulsion ground coil in one section is also two on each side. Therefore, the wiring length is also significantly reduced. It should be noted that the feeding cable has the drawback of having three extra cables than the conventional one, but this can be compensated for by the reduction of material costs and labor costs. Overall, the price / performance ratio of the ground coil for propulsion improves.

Next, FIG. 5 shows a feeding system of a superconducting magnetic levitation railway according to another embodiment of the present invention. The second embodiment system is a configuration example suitable for short composition and short distance. In FIG. 5, 41 and 42 constitute a feeder power converter as a whole, but they are single-phase power converters whose phases are different from each other by 90 degrees, and they are connected to each other (the so-called neutral point).
Is grounded. That is, this power converter for feeding is a two-phase power converter having a phase difference of 90 degrees as in the first embodiment. In addition, each single-phase power converter (41, 4,
2) is composed of a GTO inverter as in the first embodiment.

Reference numerals 43 to 45 are circuit breakers set at the outlets of the substations. In this feeder power converter, one output terminal of the single-phase power converter 41 is connected to the feeder line 4 via the circuit breaker 43.
6, the output end of the other single-phase power converter 42 is connected to one end of a power line 48 via a breaker 45, and the connection point (ground end) of both is connected via a breaker 44. It is connected to one end of the electric line 47.

The other ends of these feeder lines (46 to 48) are laid and extended from the substation into the guideway of the railway vehicle as forward and return feeder lines, respectively. Is a predetermined interval (interval of feeding control),
At one end of the section (substation side), a forward circuit breaker (49, 5
0) is set and the return circuit breaker 51 is set at the other end.

A ground coil for propulsion having the same structure as that of the first embodiment is laid on the side wall or floor of the taxiway of the railway vehicle. In this embodiment, the series coil system of 17 and 19 is used. Has one end (substation side) connected to the outgoing circuit line 46 via the outward circuit breaker 50, and the series coil system of 18 and 20 has one end (substation side) through the outgoing circuit breaker 49. It is connected to the outgoing electric line 48, and the other ends of both systems are commonly connected to the outgoing electric line 47 via the return breaker 51. Both single-phase power converters are grounded at the so-called neutral point,
The ground voltage of the series coil system of 17 and 19 and the series coil system of 18 and 20 is equal to the applied voltage.

As described above, the second embodiment system has the simple structure in which the return feeding line is integrated into one line and the feeding system is reduced from four lines to three lines. It is intended to obtain the same effect as the above.

[0044]

As described above, according to the feeding system of the superconducting magnetic levitation railway of the present invention, the ground coil for propulsion is composed of four coils as a unit, and the coils in each unit are arranged. The four-phase feeding method is adopted in which the phases are sequentially shifted by 90 degrees in accordance with the order (1). Therefore, the pole pitch of the ground system naturally expands, but the fluctuation of the propulsive force can be greatly reduced, so that the number of magnetic poles on one side per bogie can be set to an odd number in the on-board system. The number of magnetic poles on one side can be reduced from four to three, and the on-vehicle pole pitch can be expanded corresponding to the increase of the ground pole pitch without changing the bogie length.

As a result, it is possible to reduce the magnetic drag force, save power and reduce the cost of the ground coil for propulsion. In addition, since the on-vehicle magnets are given the same propulsive force without fluctuations in propulsive force, and the vertical force can also be reduced, mechanical disturbance to the superconducting magnet can be reduced and reliability and durability of the superconducting magnet are greatly improved. Has the effect of

Specifically, for example, the second invention and the third invention
Since it can be configured as in the invention, the propulsion ground coil is propelled in four phases, but the feeding system of the substation can be made into a two-phase feeding having a phase difference of substantially 90 degrees, and the feeding power can be reduced. Not only can the control part of the converter be simplified from three-phase to two-phase, but the number of cables and crossover wires laid in the vehicle taxiway can be greatly reduced, and the price-performance ratio of the ground coil for propulsion can be improved. There is.

The second invention is a constitutional example suitable for a long knitting growth distance, and the third invention is a constitutional example suitable for a short knitting short distance. There is also an effect that the feeder system can be appropriately configured according to the weight of the load, and a feeder system suitable for the superconducting magnetic levitation railway can be realized without impairing the economical efficiency and maintainability.

[Brief description of drawings]

FIG. 1 is a block diagram of a feeding system of a superconducting magnetically levitated railway according to an embodiment of the present invention.

FIG. 2 is a feeder current vector diagram for explaining two-phase feeding and four-phase propulsion according to the present invention.

FIG. 3 is an operation explanatory diagram.

FIG. 4 is an operation explanatory diagram.

FIG. 5 is a configuration block diagram of a feeding system of a superconducting magnetic levitation railway according to another embodiment of the present invention.

FIG. 6 is a configuration block diagram of a feeding system of a conventional superconducting magnetic levitation railway.

FIG. 7 is a feeder current vector diagram for explaining conventional three-phase feeding and three-phase propulsion.

[Explanation of symbols]

 1-4, 41, 42 Single-phase power converter 5-8, 43-45 Substation exit circuit breaker 9-12, 46-48 Feeding line 13, 14, 49, 50 Forward circuit breaker 15, 16, 51 Return circuit breaker 17-20 Propulsion ground coil 30 Superconducting magnet

Claims (3)

[Claims] 1. In a superconducting magnetic levitation railway in which a propulsion ground coil is fed from a feeding power converter to levitate a railway vehicle equipped with a superconducting magnet on the car; four propulsion ground coils are provided. The coil in each unit is supplied with electric power by shifting the phase by 90 degrees in order according to the order of arrangement; The feeding system for the superconducting magnetic levitation railway. 2. A superconducting magnetic levitation railway in which a propulsion ground coil is fed from a feeding power converter to levitate a railway vehicle equipped with a superconducting magnet on the vehicle; and the feeding power converter is Two sets of combination converters in which two single-phase power converters of the same phase are connected in series and the connection point is grounded. The combination converter comprises a first combination converter and a second combination converter whose phases are different by 90 degrees. The ground coil for propulsion is composed of four coils as a unit, and if the coils in each unit are a first coil, a second coil, a third coil, and a fourth coil in order, a first coil And the third coil and the second coil and the fourth coil are connected in series so as to have opposite polarities, respectively, and the series coil system of the first coil and the third coil is fed from the first combination converter, Series coil of coil and fourth coil System is electricity coming from the second union transducer; superconducting magnetic levitation railway feeding circuit system, characterized in that. 3. A superconducting magnetic levitation railway in which a ground coil for propulsion is fed from a power converter for feeding, and a railway vehicle equipped with a superconducting magnet on the vehicle is levitated; the power converter for feeding is: It is composed of a combination converter in which two single-phase power converters whose phases are different from each other by 90 degrees are connected and the connection point is grounded; The propulsion ground coil is composed of four coils as a unit, and each unit is a unit. If the coils in the order are the first coil, the second coil, the third coil, and the fourth coil in the order of arrangement, the first coil and the third coil, and the second coil and the fourth coil have opposite polarities. A system of superconducting magnetic levitation railways, which is connected in series, and each series coil system is fed from the combination converter with its ground end as a common return path.