磁共振成像系统中梯度放大器前级电源的非线性控制

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清华大学辅仁网/2017-07-07

施洪亮, 许劲, 崔彬, 蒋晓华

清华大学电机系, 电力电子与电机控制国家重点实验室, 北京 100084

Nonlinear control for the front end power supplies of magnetic imaging resonance gradient amplifiers

SHI Hongliang, XU Jing, CUI Bin, JIANG Xiaohua

State Key Laboratory of Power Electronics and Electric Machine Control, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

摘要:

输出: BibTeX | EndNote (RIS)

摘要为了实现磁共振成像系统中梯度放大器前级电源对负载电流阶跃的高速响应, 提出了一种单电压环非线性PID控制器, 该控制器的控制参数是基于误差变化的指数函数。为了进一步提高性能, 在此非线性PID控制器的基础上, 增加了一个电流内环比例控制器。在一台120 V/30 A的前级电源样机上进行了实验验证, 将这2种控制策略对负载电流阶跃时输出电压动态响应结果与系统的动态物理极限进行了对比。实验结果表明: 所设计的电压电流双闭环非线性控制器比单电压环非线性PID控制器有更好的动态响应性能, 更接近系统的动态物理极限。

关键词 ：前级电源,动态响应,动态物理极限,非线性PID控制,电流模式控制

Abstract：A nonlinear digital PID single loop control method was developed to improve the dynamic load response of the front end power supply of magnetic imaging resonance (MRI) gradient amplifiers with the controller parameters are based on the exponential functions of the error. The dynamic load response is improved by an inner-loop current controller added to the nonlinear digital PID controller. The two control methods are verified in a 120 V/30 A prototype of the power supply for a step load current change and compared with the dynamic physical limits of the system. The results indicate that the controller has better dynamic performance which is closer to the dynamic physical limits of the system that the original nonlinear PID controller.

Key words：power supply dynamic response dynamic physical limits nonlinear PID control current-mode control

收稿日期: 2016-01-04 出版日期: 2016-04-01

ZTFLH:

TM464

通讯作者:蒋晓华,教授,E-mail:jiangxiaohua@tsinghua.edu.cnE-mail: jiangxiaohua@tsinghua.edu.cn

引用本文:

施洪亮, 许劲, 崔彬, 蒋晓华. 磁共振成像系统中梯度放大器前级电源的非线性控制[J]. 清华大学学报（自然科学版）, 2016, 56(3): 306-311,317.
SHI Hongliang, XU Jing, CUI Bin, JIANG Xiaohua. Nonlinear control for the front end power supplies of magnetic imaging resonance gradient amplifiers. Journal of Tsinghua University(Science and Technology), 2016, 56(3): 306-311,317.

链接本文:

http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.21.029或 http://jst.tsinghuajournals.com/CN/Y2016/V56/I3/306

图表:

图1　前级电源主电路图

图2　移相全桥电路稳态波形图

表1　前级电源样机参数表

图3　非线性K_p 变化曲线

图4　非线性K_i 变化曲线

图5　非线性K_d 变化曲线

图6　非线性PID 控制与物理极限动态过程中输出电压和输出电流

图7　电流连续模式下电感电流波形图

图8　闭环控制器框图

图9　闭环控制器简化框图

图10　电压电流双闭环非线性控制和物理极限动态过程的输出电压和输出电流

表2　不同控制方法实验结果

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