A Novel Design Method of AC Motor Current Regulator in Discrete-Time Domain

doi:10.11985/2017.03.004

Abstract

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

CLC Number:

TM351

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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References 21

[1]	Dai Ying, Song Liwei, Cui Shumei . Development of PMSM drives for hybrid electric car applications[J]. IEEE Transactions on Magnetics, 2007,43(1):434-437.
[2]	王成元, 夏加宽, 孙宜标 . 现代电机控制技术[M]. 北京: 机械工业出版社, 2009.
[3]	Pucci M, Vitale G. High performance VOC-FOC based wind generator system with induction machine[C].IEEE International Electric Machines and Drives Conference, 2009: 1474-1479.
[4]	Simanek J, Novak J, Cerny O, et al. FOC and flux weakening for traction drive with permanent magnet synchronous motor[C]. IEEE International Symposium on Industrial Electronics. 2008: 753-758.
[5]	Geyer T, Papafotiou G, Morari M . Model predictive direct torque control;part I: Concept, algorithm, and analysis[J]. IEEE Transactions on Industrial Electronics, 2009,56(6):1894-1905.
[6]	Zhang Yongchang, Zhu Jianguo . A novel duty cycle control strategy to reduce both torque and flux ripples for DTC of permanent magnet synchronous motor drives with switching frequency reduction[J]. IEEE Transactions on Industrial Electronics, 2011,26(10):3055-3067.
[7]	Foo G, Rahman M . Sensorless direct torque and flux-controlled IPM synchronous motor drive at very low speed without signal injection[J]. IEEE Transactions on Industry Application, 2010,57(1):395-403.
[8]	Pacas M, Weber J . Predictive direct torque control for the PM synchronous machine[J]. IEEE Transactions on Industrial Electronics, 2005,53(5):1350-1356.
[9]	李武军, 阮毅 . 矢量控制系统的电流解耦及其调节器设计[J]. 电机与控制应用, 2008,36(12):18-22.
	Li Wujun, Run Yi . Decoupling of current and design of controller for vector control system[J]. Electrical Machines & Control Application, 2008,36(12):18-22.
[10]	Holtz J, Quan J, Pontt J , et al. Design of fast and robust current regulators for high-power drives based on complex state variables[J]. IEEE Transactions on Industry Applications, 2004,40(5):1388-1397.
[11]	Kim H, Degner M, Guerrero J , et al. Discrete-time current regulator design for AC machine drives[J]. IEEE Transactions on Industry Applications, 2010,46(4):1425-1435.
[12]	Yepes A, Vidal A, Freijedo F, et al. A simple tuning method aimed at optimal settling time and overshoot for synchronous PI current control in electric machines[C].IEEE Energy Conversion Congress and Exposition, 2013: 1465-1472.
[13]	Zhang Y, Xia B, Yang H . Performance evaluation of an improved model predictive control with field oriented control as a benchmark[J]. IET Electric Power Applications, 2017, in press.(DOI:10.1049/iet-epa.2015.0614)
[14]	Zhang Yongchang, Yang Haitao . Model predictive torque control of induction motor drives with optimal duty cycle control[J]. IEEE Transactions on Power Electronics, 2014,29(12):6593-6603.
[15]	Holtz J . The representation of AC machine dynamics by complex signal flow graphs[J]. IEEE Transactions on Industrial Electronics, 1995,42(3):263-271.
[16]	Zhang Y, Yang H . Torque ripple reduction of model predictive torque control of induction motor drives[C]. IEEE Energy Conversion Congress and Exposition, 2013: 1176-1183.
[17]	Li Q, Wang N, Yi D. Numerical analysis[M]. Tsinghua University Press, 2001.
[18]	Bae B H, Sul S K . A compensation method for time delay of full-digital synchronous frame current regulator of PWM AC drives[J]. IEEE Transactions on Industry Applications, 2003,39(3):802-810.
[19]	Yim J S, Sul S K, Bae B H , et al. Modified current control schemes for high-performance permanent magnet AC drives with low sampling to operating frequency ratio[J]. IEEE Transactions on Industry Applications, 2009,45(2):763-771.
[20]	Huh K K, Lorenz R. Discrete-time domain modeling and design for AC machine current regulation [C]. Industry Applications Conference, 2007: 2066-2073.
[21]	杨海涛 . 异步电机无速度传感器模型预测控制[D]. 北京:北方工业大学, 2015.

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