考虑延时补偿的永磁同步电机电流预测控制

doi:11.11985/2016.03.002

摘要/Abstract

摘要：

传统的永磁同步电机控制方法采用磁场定向控制（FOC）,电流内环采用PI调节器,但PI参数整定不当时容易出现超调和振荡,同时数字控制固有的采样、滤波延时等因素,也会影响电流内环的性能。因此,改善电流内环性能是人们研究高性能永磁同步电机的热点问题。近年来,预测控制逐渐应用在永磁同步电机上,但传统的预测控制需要精确的数学模型。为此,提出了一种永磁同步电机的电流预测控制方法,利用过去时刻的电压电流信息计算出反电动势,经过一拍延时补偿后,再将得到的反电动势代入模型预测中,从而消除反电动势项中参数误差的影响。这种方法不仅补偿了延时的影响,而且模型参数中仅用到了电阻和电感,增强了系统鲁棒性,其有效性通过实验得到了验证。

关键词: 永磁同步电机, 一拍延时补偿, 电流预测控制, 鲁棒性

Abstract:

Field oriented control (FOC) is the traditional control method of permanent magnet synchronous motor (PMSM) drives, which employs PI regulator in the inner current loop. However, inappropriate PI parameter may lead to overshoot and oscillation. Furthermore, the inherent delay caused by sampling and filtering in digital control will also affect the performance of current control. Therefore, improving the performance of inner current loop becomes a hot issue for the high performance control of PMSM drives. In recent years, predictive control has been applied to permanent magnet synchronous motor, but it requires accurate mathematical model. This paper proposes a novel predictive current control method for PMSM drives, which firstly calculate the back EMF based on the voltage/current at the previous instant, and then substitute the EMF into model prediction after one-step delay compensation. Hence, the influence caused by parameter mismatch in EMF is eliminated. The propose method not only compensates the influence of digital delay, but also enhances the system robustness, because only the value of inductance is required. The presented experimental results confirm the effectiveness of the proposed method.

Key words: Permanent magnet synchronous motor, one step delay compensation, predictive current control, robustness

中图分类号:

TM351

张永昌,高素雨. 考虑延时补偿的永磁同步电机电流预测控制[J]. 电气工程学报, 2016, 11(3): 13-20.

Zhang Yongchang,Gao Suyu. Predictive Current Control for Permanent Magnet Synchronous Motor with Delay Compensation[J]. Journal of Electrical Engineering, 2016, 11(3): 13-20.

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参数	数值
电机额定电压U_n/V	380
电机额定功率P_n/kW	1.5
直流母线电压U_dc/V	540
电机额定频率f /Hz	100
电机极对数n_p	4
电机定子电阻R_s/Ω	0.4
d轴和q轴电感L /mH	4.41
电机额定转矩T_n/N·m	9.55
永磁体磁链Ψ_sif/Wb	0.212 5