CN108638913B - Power configuration method for medium-speed magnetic levitation traction system - Google Patents

Abstract

The invention discloses a power configuration method of a medium-speed magnetic levitation traction system, wherein a set of traction system is adopted by a vehicle; the traction system at least comprises: a traction inverter; 6 suspension frames are configured on a section of vehicle, wherein a linear motor is respectively arranged on the left side and the right side of 4 suspension frames, and 8 linear motors arranged on the left side and the right side of 4 suspension frames are used as linear motor units; 4 linear motors on the same side of the middle 4 suspension frames are connected in series, and then the linear motors connected in series on the two sides are connected in parallel; the input end of the linear motor unit is connected with the output end of the traction inverter; the method of the invention meets the power design requirement of the linear motor and the traction capacity design requirement of the magnetic suspension vehicle. The light weight of the vehicle is realized to the greatest extent, and the suspension and passenger carrying capacity of the vehicle are improved.

Description

A power configuration method for a medium-speed maglev traction system

technical field

The invention belongs to the field of train traction system control, in particular to a power configuration technology of a magnetic levitation train traction control system.

Background technique

Compared with traditional urban rail transit such as subways and low floors, medium and low-speed maglev trains have various advantages. High comfort, ultra-small radius curve passing ability, strong climbing ability and relatively low cost all promote medium and low-speed maglev trains. It has become the most popular rail transit system and has a good development prospect. Due to the generally low speed of urban rail transit such as the popular subway and light rail, and the suburban transportation has higher requirements for speed, the medium and low speed maglev just fills the gap between the subway and the high-speed rail. At present, the medium and low speed maglev trains at home and abroad are based on the DC1500V power supply system. Due to the limited suspension capacity of the suspension system, if the traditional full-power unit configuration is used for all suspension frames, the increase in the number of equipment will restrict the suspension passenger capacity of the maglev vehicle. Therefore, On the premise of satisfying the traction capacity, it is the primary issue to achieve the maximum weight of the vehicle. This solution can not only better adapt to the limited space under the car body, but also improve the passenger-carrying capacity of the maglev train.

At present, most of the medium and low speed maglev trains use a full power unit configuration based on a traction system, that is, traction motors are installed on both sides of all suspension frames to provide power. For six suspension racks, if each suspension rack is equipped with one linear motor on the left and right sides, one traction inverter will control 12 linear motors through the six-series-two-parallel control method. (1) The medium-speed maglev needs to achieve a speed level of 120km/h, the traction inverter capacity is about 864kVA, and the number of traction motors is 12, and the required capacity of the traction motor is only 72kVA. According to this power configuration method, the design capacity utilization rate of the traction motor is low, and most of the equipment space under each suspension frame will be occupied by the traction motor, which is not conducive to the arrangement of other equipment in the limited space below the vehicle body. (2) Due to the increase in the number of linear motors, the overall mass of the maglev vehicle will inevitably increase, which means that the vehicle's passenger-carrying capacity will be further reduced in the case of a certain suspension capacity.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention proposes a power allocation method for a medium-speed maglev traction system, which adopts a power distribution scheme of four movements and two trailers of a single vehicle and single traction system, so as to solve the problem that the current limited suspension capacity and insufficient space under the vehicle cannot be installed. Off-vehicle related equipment and other issues.

The technical scheme adopted by the present invention is as follows: a power configuration method for a medium-speed maglev traction system, one set of traction systems is used for one vehicle; the traction system at least includes: a traction inverter;

One vehicle is equipped with 6 suspension frames, of which 4 suspension frames are arranged with a linear motor on the left and right sides, and the 8 linear motors arranged on the left and right sides of the 4 suspension frames are used as linear motor units;

The 4 linear motors on the same side of the middle 4 suspension racks are connected in series, and then the linear motors connected in series on both sides are connected in parallel;

The input end of the linear motor unit is connected to the output end of the traction inverter.

Further, the six suspension racks are symmetrically distributed in the middle of the vehicle.

Further, one linear motor is arranged on the left and right sides of the middle four suspension racks among the six suspension racks of this section of the vehicle.

Further, the traction system further includes: a high-voltage junction box, a high-voltage electrical cabinet, a reactor box and a three-phase auxiliary inverter; the high-voltage junction box is connected to the DC voltage from the substation, The DC voltage is divided into six circuits through the high-voltage electrical cabinet, the first circuit is input to the traction inverter after passing through the reactor, the second circuit is directly input to the traction inverter, the third circuit and the fourth circuit are connected to DC330V, and the fifth circuit is connected to the traction inverter. The sixth route is connected to the three-phase auxiliary inverter.

Further, the terminal voltage of each linear motor is 275V.

Beneficial effects of the present invention: The present invention adopts the configuration scheme of six suspension frames for a single vehicle, four motions and two trailers, in which only the middle four suspension frames provide traction power, and a total of 8 linear motors are arranged on both sides of the four suspension frames, so as to provide traction power. Meet the design requirements of the traction capacity of the medium-speed maglev train; it has the following advantages:

(1) A single vehicle is equipped with six suspension frames, which ensures that the maglev vehicle has good curve passing performance;

(2) 8 linear motors are equipped on the six suspension racks, the capacity of a single motor is about 108kVA, the maximum traction force is about 4kN, and the traction force when reaching a speed of 120km/h is about 3.2kN; the resistance of a single-section maglev vehicle reaching the maximum design speed is about 5kN, so the characteristic design and quantity of the linear motor are enough to meet the traction force required by the maglev vehicle at a speed of 120km/h, ensure the traction acceleration, and enable the maglev vehicle to have the ability to run at the design speed;

(3) Reasonably distribute the power of the six suspension racks of a single car, and the running mechanism as a whole forms a configuration scheme of four motions and two trailers, which ensures the traction force required by the 120km/h speed level on the basis of only using one traction system. It also improves the utilization rate of the traction motor capacity; the power unit and the non-power unit are symmetrically arranged with the center line of the horizontal line of the car body as the boundary, which makes the force distribution of each suspension frame more reasonable under the conditions of traction and braking;

(4) 8 linear motors are arranged on both sides of the four suspension racks in the power unit, and are wired in four series and two parallels with the longitudinal centerline as the boundary; the existing conditions and equipment are used to the greatest extent, and the reasonable distribution of power is achieved. , reducing the number of motors, and at the same time, the simple and reasonable wiring method also takes into account the particularity of the maglev vehicle body, which better adapts to the compact space under the vehicle body; moreover, it realizes the light weight of the vehicle and improves the passenger carrying capacity of the vehicle; The economical and simple method solves the problems of limited layout space and insufficient levitation capacity of the current medium and low speed maglev equipment;

(5) The reasonable arrangement of the equipment based on this power distribution scheme ensures the maximum force uniformity and force balance of the vehicle during operation, and improves the running stability and safety of the train;

(6) Under the premise of not changing the DC1500V standard and the capacity of a single traction inverter, the present invention can meet the traction capacity design of the maglev vehicle by changing the terminal voltage of the linear motor, reducing the number of motors, and reasonably configuring the power of the six suspension frames. It can better adapt to the limited space under the car and improve the suspended passenger carrying capacity.

Description of drawings

Fig. 1 is the scheme schematic diagram of the present invention;

Figure 2 shows the principle of the traction system.

Detailed ways

In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below with reference to the accompanying drawings.

The present invention is a power configuration method for a traction system suitable for a medium-speed maglev train. Based on the traction characteristics of a linear induction motor suitable for a speed of 120km/h, a configuration scheme of six suspension frames for a single vehicle, four movements and two trailers is adopted, wherein Only the four suspension racks in the middle provide traction power, and a total of 8 linear motors are arranged on both sides of the four suspension racks to meet the traction capacity design requirements of medium-speed maglev trains. The single traction system used by a single car, as shown in Figure 1, mainly includes a high-voltage junction box, a high-voltage electrical cabinet, a reactor box and a traction inverter to control 8 linear motors. . Based on the DC1500V power supply system of domestic medium and low-speed maglev trains and the design capacity of a traction inverter of 1500kVA, the design capacity of a single linear motor is about 108kVA, and the required capacity of 8 motors is about 860kVA. It can be seen that a traction inverter The device is sufficient to meet the design capacity requirements of maglev vehicles at a speed of 120km/h. The DC330V shown in Figure 1 is the suspension power supply.

The maglev vehicle with a speed of 120km/h adopts the power configuration scheme of the single-car, single-traction system, six suspensions, four-movement and two-trailer. The first and sixth suspensions at both ends of the vehicle are non-power units, and 8 linear motors are arranged on both sides of the 4 power units, and the wiring method of four series and two parallels is adopted. This configuration scheme meets the power design requirements of the linear motor and the traction capacity design requirements of the maglev vehicle. The lightweight of the vehicle is achieved to the greatest extent, and the suspension and passenger carrying capacity of the vehicle are improved.

As shown in Figure 2, the main function of the traction system is to invert the DC1500V into AC to drive 8 three-phase linear traction motors to realize the traction of the maglev train. The connection mode of the motors is four series and two parallels. According to the requirements of input voltage and current, the main circuit of the inverter adopts a two-level voltage inverter circuit, and the power device adopts IGBT.

If the train speed grade changes, and the traction linear motor capacity and equipment size can be reasonably matched with the installation space, the total traction force requirement can be met by further increasing the linear motor terminal voltage, thereby reducing the number of motors. This solution saves the space for the layout of the equipment under the vehicle, and at the same time realizes the lightweight of the vehicle, and meets the traction requirement of using the linear motor as the driving method to realize the speed level of the train running at 120km/h.

The four power suspension frames and the two non-power suspension frames of the configuration scheme of the present invention are located in the middle and both ends of the lower part of the vehicle body respectively, and only rely on the traction motors arranged on both sides of the second, third, fourth and fifth suspension frames to provide Power, by adopting the four-action and two-drag force distribution method, the symmetrical arrangement of the lateral center line of the car body can make the force distribution of the suspension frame and the car body during traction and braking more reasonable, and ensure the dynamic performance of the vehicle and ride comfort; At the same time, what is more important is that the arrangement of the present invention eliminates the end effect of the linear traction motor and ensures good traction characteristics of the motor; The wiring between the 8 traction linear motors will be further simplified, saving more space under the vehicle; on the other hand, due to the reduction in the number of equipment, the vehicle is lightened and the passenger carrying capacity of the vehicle is improved. The problems of limited layout space and insufficient levitation capacity of the current medium and low-speed maglev equipment are solved by a relatively economical and simple method. The reasonable arrangement of the equipment based on this power distribution scheme ensures the uniform and balanced force of the vehicle during operation to the greatest extent, and improves the running stability and safety of the train.

The capacity of a single motor of the present invention is about 108kVA, the maximum traction force is about 4kN, and the traction force when the speed reaches 120km/h is about 3.2kN. The resistance of a single-section maglev vehicle to reach the maximum design speed is about 5kN, so the characteristic design and quantity of the linear motors are sufficient to meet the traction force required by the maglev vehicle at a speed of 120km/h, ensuring the traction acceleration; and the 8 units in the 4 power units of the present invention The linear motor is controlled by a traction system, which minimizes the number of equipment under the vehicle body under the premise of satisfying the traction performance, saves the equipment layout space, reduces the burden of the vehicle, and improves the suspension capacity.

Those of ordinary skill in the art will appreciate that the embodiments described herein are intended to assist readers in understanding the principles of the present invention, and it should be understood that the scope of protection of the present invention is not limited to such specific statements and embodiments. Various modifications and variations of the present invention are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims (3)

1. A power configuration method for a medium-speed maglev traction system, characterized in that a set of traction systems is adopted for one vehicle; the traction system at least comprises: a traction inverter; A vehicle is equipped with 6 suspension frames, and one linear motor is arranged on the left and right sides of the middle 4 suspension frames among the 6 suspension frames of the vehicle, and the 8 linear motors arranged on the left and right sides of the middle 4 suspension frames are used as linear motors. motor unit; The 4 linear motors on the same side of the middle 4 suspension racks are connected in series, and then the linear motors connected in series on both sides are connected in parallel; The input end of the linear motor unit is connected with the output end of the traction inverter; The six suspension racks are symmetrically distributed in the middle of the vehicle. 2. The power configuration method of a medium-speed maglev traction system according to claim 1, wherein the traction system further comprises: a high-voltage junction box, a high-voltage electrical cabinet, a reactor box and a three-phase Auxiliary inverter; the high-voltage junction box is connected to the DC voltage from the substation through the current receiver, the DC voltage is divided into six paths through the high-voltage electrical cabinet, and the first path is input to the traction inverter after passing through the reactor, The second channel is directly input to the traction inverter, the third and fourth channels are connected to DC330V, and the fifth and sixth channels are connected to the three-phase auxiliary inverter. 3 . The power configuration method for a medium-speed maglev traction system according to claim 2 , wherein the terminal voltage of each linear motor is 275V. 4 .

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