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A control method for adjusting the steady-state current ripple of an electromagnet in an electromagnetic suction suspension system

A steady-state current and electromagnetic attraction technology, applied to electrical components, output power conversion devices, etc., can solve problems such as not studying and controlling ripple current

Inactive Publication Date: 2016-07-13
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] In the current current control of the suspension system, only the steady-state current is controlled, and the ripple current is not studied and controlled

Method used

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  • A control method for adjusting the steady-state current ripple of an electromagnet in an electromagnetic suction suspension system
  • A control method for adjusting the steady-state current ripple of an electromagnet in an electromagnetic suction suspension system
  • A control method for adjusting the steady-state current ripple of an electromagnet in an electromagnetic suction suspension system

Examples

Experimental program
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Effect test

Embodiment 1

[0067] The software method is used to implement the current control link, ripple control link and switch distribution link. First, sample the output electromagnet current of the suspension chopper circuit of the suspension system, sample 20 times in one switching cycle, and calculate the average value through 20 sampling values, which is considered to be equal to the actual steady-state current in a single cycle, and calculate 20 The difference between the maximum and minimum values ​​of the two sampling values ​​is considered to be equal to the actual current ripple value. In the current control link, according to the given current value given by the suspension system and the actual steady-state current, according to the PID algorithm, the total time dT that needs to be opened for the upper and lower bridge arms is calculated. The ripple control link can also calculate the time d that the upper and lower bridge arms need to be turned on at the same time according to the PID a...

Embodiment 2

[0069] The software method is used to implement the current control link, ripple control link and switch distribution link. Firstly, the output electromagnet current of the suspension chopper circuit of the suspension system is sampled, and the current is sampled at a fixed moment in a switching cycle. The sampled value is considered to be equal to the actual steady-state current in a single cycle. In the current control link, according to the given current value given by the suspension system and the actual steady-state current, according to the PID algorithm, the total time dT that needs to be opened for the upper and lower bridge arms is calculated. The ripple control link is given according to the ripple current according to Calculate the time d that the upper and lower bridge arms need to be opened at the same time 12 T, where L, R are the resistance and inductance of the electromagnet, Δi is the given ripple value, U i is the input voltage value, I 0 is the actual st...

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Abstract

The invention discloses a control method for adjusting the steady-state current and ripple of an electromagnet in an electromagnetic suction suspension system. The switch control of the upper and lower bridge arms of the suspension chopper circuit in the current realization link of the traditional electromagnetic suction suspension control system can ensure that the current steady-state value follows the given steady-state value, and at the same time, the ripple value can also be within a certain range as required. Adjust within the range. In the control, first calculate the total turn-on time of the upper and lower bridge arms required for control according to the current given value and feedback value, and then calculate the simultaneous turn-on time of the upper and lower bridge arms according to the given ripple requirements. In the same switching cycle, according to The total turn-on time and simultaneous turn-on time of the upper and lower switch tubes are determined according to the methods of equal pulse width, same turn-on time or same turn-off time, respectively, to determine the turn-on and turn-off times of the upper and lower switch tubes, so as to realize the ripple under the steady-state output current of the suspension electromagnet. Wave size control.

Description

technical field [0001] The invention relates to a control scheme for the current and ripple of a suspension chopper of an electromagnetic suction suspension system of a medium-low speed maglev train. Background technique [0002] In electromagnetic attraction suspension systems such as maglev trains (hereinafter referred to as suspension systems), the required electromagnet current is often calculated by detecting the size of the suspension air gap. The required electromagnet current is realized by the power amplification unit, and the amplified electromagnet current provides guarantee Suspension system stable electromagnetic force. Among them, the realization of the electromagnet current adopts a linear amplified power supply under the condition of low power, and the electromagnet current output does not contain ripples. In the high-power link, a switch circuit is used. Since the switch circuit works in the switch state, the electromagnet is constantly in the state of char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14
Inventor 董金文张昆仑郭小舟王滢刘放刘国清靖永志
Owner SOUTHWEST JIAOTONG UNIV