Double-tube independent interleaving control method for electromagnetic attraction suspension system

A control method and technology of electromagnetic attraction, applied in the direction of holding device with magnetic attraction or thrust, electric traction, electric vehicle, etc., to achieve the effect of increasing the number of adjustments, speeding up the response, and increasing the control and switching frequency

Inactive Publication Date: 2014-08-13
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this rapid change in current brings the other side

Method used

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  • Double-tube independent interleaving control method for electromagnetic attraction suspension system
  • Double-tube independent interleaving control method for electromagnetic attraction suspension system
  • Double-tube independent interleaving control method for electromagnetic attraction suspension system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The two switching tubes T1 and T3 are controlled with the same cycle and the same control algorithm. Assume that the switching periods of T1 and T3 are both T, but the turn-on time and the duty cycle are not consistent, and the difference between the turn-on time is t 3 , the duty cycle is d 1 and d 2 . where U i is the input voltage, i o is the output current, I 0 To output the DC component, the inductance of the current electromagnet is L and the resistance is R.

[0018] by attaching image 3 , we can see that in each switching cycle, there may be three levels of positive, zero and negative.

[0019] Table 1 Working status of the chopper (where 1 stands for on and 0 stands for off)

[0020]

negative level

Positive level

zero level

zero level

T1 state

0

1

1

0

T3 state

0

1

0

1

Conduction ratio

d -1

d 12

d 10

d 20

[0021] where d 12 Ind...

Embodiment 2

[0030] The two switching tubes T1 and T3 are controlled with the same period and different control algorithms, and the interleaving time of sampling and PWM implementation is fixed.

Embodiment 3

[0032] The two switching tubes T1 and T3 are controlled with different cycles and the same control algorithm, and the interleaving time of sampling and PWM implementation will show periodic changes.

[0033] The invention can be used in the current control link of the electromagnetic suction levitation system, for example, can be used in the current control of the magnetic levitation vehicle, which is beneficial to reducing the static disturbance of the system and increasing the system frequency equivalently.

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PUM

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Abstract

The invention discloses a double-tube independent interleaving control method for an electromagnetic attraction suspension system. The method aims at carrying out independent control on the current of the conventional electromagnetic attraction suspension control system by virtue of an upper switch tube and a lower switch tube of an H-shaped chopper in links, and the sampling time, calculating time and implementation time in control are subjected to interleaving. By adopting the independent interleaving control, the control and switching frequency of the system can be equivalently increased without changing the structure of a main circuit and the switching frequency of single tube, so that small pulse and zero level can be naturally generated; and by adopting the method, the static current ripple can be controlled, so that the error in current tracking can be reduced, and the fastest speed in current tracking can be kept, the complexity and safety of the system are maintained, and as a result, the performance of the system is improved.

Description

technical field [0001] The invention relates to a method for electromagnetic suction levitation control, in particular to a levitation control and power electronic technology for an electromagnetic attraction levitation system. Background technique [0002] In the electromagnetic attraction levitation system such as medium and low speed maglev trains, the system is unstable due to the approximate inverse square relationship between the electromagnetic attraction force and the levitation air gap, and feedback control must be used to make the system a stable system. In feedback control, the magnitude of the electromagnet current that needs to be adjusted is calculated by detecting the size of the suspension air gap, that is, the control amount or the electromagnet current setting. The electromagnet current is equal to the expected electromagnet current setting through the suspension chopper, so that the electromagnetic force can be adjusted by adjusting the electromagnet curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L13/04H02N15/00
Inventor 董金文张昆仑
Owner SOUTHWEST JIAOTONG UNIV
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