High-response current control method of alternating-current servo system

A current-response, AC servo technology, applied in the direction of AC motor control, motor control, motor generator control, etc., can solve the problems affecting the dynamic response of the current loop, steady-state error, and the response characteristics of the current loop of the AC servo system

Inactive Publication Date: 2020-01-10
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The current loop of the AC servo system often uses a PI regulator to control the dq axis current, which cannot well meet the rapidity requirements in some high-response applications
[0006] (2) There is coupling between the AC and D axes in PI control, which affects the dynamic response of the current loop
[0007] (3) Hysteresis loop control Although the response of the current loop is fast, the switching frequency under this algorithm is not fixed, the output current contains harmonic distortion, and there is a steady-state error
Moreover, in the existing technology, current sampling delay, voltage output lag and dq axis voltage coupling will restrict the improvement of the current loop response bandwidth, thus affecting the high response characteristics of the current loop of the AC servo system

Method used

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  • High-response current control method of alternating-current servo system
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  • High-response current control method of alternating-current servo system

Examples

Experimental program
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Effect test

Embodiment

[0069] 1. Performance Analysis of AC Servo System Current Loop PI Control

[0070] 1.1 Current loop model of AC servo system

[0071] The AC servo system often uses the PI regulator as the control mode of the current loop. The structure model of the current loop is as follows: figure 2 shown.

[0072] figure 2 , the current reference value and feedback value The difference Δi dq As given by the current regulator, the output voltage of the current regulator is After voltage compensation, after coordinate transformation, the duty cycle and PWM update are calculated, and finally the voltage is generated by the inverter to drive the motor. where T d That is, delaying the duty cycle calculation and PWM update reduces the current loop bandwidth.

[0073] In the synchronous rotating coordinate system, the q-axis voltage equation can be obtained as follows:

[0074]

[0075] According to the structure of the current loop, the reference voltage in the synchronous rotat...

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Abstract

The invention belongs to the current control technology field, and discloses a high-response current control method of an alternating current servo system and a control system. The method is characterized by reducing a voltage output lag by using a mode of PWM duty ratio double refreshing in a current control period; adopting a current prediction control algorithm, processing a current sampled atthe moment through the prediction control algorithm to obtain a predicted voltage at the next moment, taking the predicted voltage as output of a current loop, and offsetting sampling delay; and usingcomplex vector decoupling control for dq-axis voltage coupling. A simulation test shows that compared with a conventional PI regulator, the method of the invention has a better current response characteristic. In the invention, current loop performance is improved, a response is increased, and a rapidity requirement can be well satisfied in some high-response application occasions; and in obtained decoupled current prediction, a current loop bandwidth is the widest, and the response is the fastest.

Description

technical field [0001] The invention belongs to the technical field of current control, and in particular relates to a high-response current control method for an AC servo system. Background technique [0002] Currently, the closest prior art: [0003] The AC servo system with permanent magnet synchronous motor (PMSM) as the control object mainly aims at high efficiency, high precision and high response performance. Commonly used control methods include PI control and hysteresis control. Although PI control is simple and convenient, AC, There is coupling on the direct axis, which affects the dynamic response of the current loop. Although the response of the hysteresis control current loop is fast, the switching frequency under this algorithm is not fixed, the output current contains harmonic distortion, and there is a steady-state error. Therefore, in order to improve the current response characteristics of the servo system and ensure the stability of the current output, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/22H02P25/024H02P27/08
CPCH02P21/22H02P25/024H02P27/08H02P2207/05
Inventor 赵云廖政斌王泽飞菜美东宋茂良
Owner HUBEI UNIV OF TECH
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