一种新型的交流电机离散电流调节器设计

doi:10.11985/2017.03.004

摘要/Abstract

摘要：

本文提出一种离散域（z域）下设计交流电机电流调节器的方法,属于高性能交流电机控制领域。由于受到环路间存在交叉耦合项、控制器离散化处理时产生的误差及数字控制系统延迟等因素的影响,调节器的控制效果会产生劣化。本文将交流电机控制系统中的d、q轴电流环当作一个整体,在离散域建立交流电机的电流环数学模型,同时考虑数字控制系统的一拍延迟来直接设计离散域电流调节器。最后基于自动控制原理,推导出电流调节器参数设计的最大值与最优值。仿真和实验结果表明,采用优化设计的电流调节器后,d、q轴电流动态响应快且没有超调。

关键词: 交流电机, 离散域, 电流调节器, 一拍延时

Abstract:

This paper proposeds a novel design method of AC motor current regulator in discrete-time domain, which belongs to the high-performance control field of AC motor drives. In FOC, the linear PI regulators are used to design the d-axis and q-axis current loops. Due to the influence of the cross coupling term, the discrete error of the controller and the delay of the digital control system, the control effect of the controller is degraded. Therefore, this paper proposed a novel method where the d-axis and q-axis current loops are considered as a whole. Then, the current loop model of AC motor is established in the discrete-time domain. At the same time one step delay is considered in digital system to design discrete-time current regulator. Finally, based on the automatic control theory, the maximum and optimal value of current regulator parameters are derived.

Key words: AC motor, discrete-time domain, current regulator, one-step delay

中图分类号:

TM351

张永昌,夏波,白宇宁,杨海涛. 一种新型的交流电机离散电流调节器设计[J]. 电气工程学报, 2017, 12(3): 24-32.

Yongchang Zhang,Bo Xia,Yuning Bai,Haitao Yang. A Novel Design Method of AC Motor Current Regulator in Discrete-Time Domain[J]. Journal of Electrical Engineering, 2017, 12(3): 24-32.

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参数	数值
U_dc/V	540
P_n/kW	2.2
U_n/V	380
f_n/Hz	50
N_p	2
T_n/N·m	14
R_s/Ω	3.126
R_r/Ω	1.879
L_m/Η	0.221
L_s/Η	0.23
L_r/Η	0.23
Ψ_s/Wb	0.91