基于占空比调制的永磁同步电机预测电流控制  

Predictive Current Control of Permanent Magnet Synchronous Motor Based on Duty-cycle Modulation

作　　者：刘佳敏 葛召炎[1] 吴轩[1] 吴公平 肖伸平[2] 黄科元[1] LIU Jiamin;GE Zhaoyan;WU Xuan;WU Gongping;XIAO Shengping;HUANG Keyuan(College of Electrical&Information Engineering,Hunan University,Changsha 410082,Hunan Province,China;Key Laboratory for Electric Drive Control and Intelligent Equipment of Hunan Province(Hunan University of Technology),Zhuzhou 412007,Hunan Province,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082 [2]电传动控制与智能装备湖南省重点实验室(湖南工业大学),湖南省株洲市412007

出　　处：《中国电机工程学报》2020年第10期3319-3327,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51777064)。

摘　　要：针对永磁同步电机(permanent magnet synchronous motor,PMSM)传统模型预测控制系统在低采样频率下,存在稳态电流波动较大的问题,该文提出一种基于占空比调制的模型预测电流控制策略。该策略将电流无差拍原理与PMSM数学模型相结合,运用三相电压矢量将相平面划分为3个扇区,进行电流预测迭代,来直接获取三相开关驱动脉冲的占空比,输出幅值与相角变化的电压矢量,显著提高了控制系统的稳态性能。对比传统模型预测方法,该方法在一个控制周期仅进行3次电流预测;相较于双矢量模型预测电流控制方法,该方法输出的电压范围增大、稳态电流脉动更小。最后,通过实验验证所提方法的有效性和可靠性。Aiming at the problem that the steady-state current fluctuation of predictive control systems for the permanent magnet synchronous motor(PMSM) is large at low sampling frequency, a model predictive current control method based on duty-cycle modulation was proposed. The strategy combines the current dead-beat principle with the mathematical model of a permanent magnet synchronous motor. The threephase voltage vector was used to divide the phase plane into three sectors, and current prediction iteration was performed to directly obtain the duty-cycle of the three-phase switch drive pulse. The amplitude and phase angle of the voltage vector can be adjusted which can significantly improve the steady state performance of the control system. Compared with the three-vector-based model prediction method, the method predicts current 3 times one control cycle. Compared with the double-vector-based model prediction current control method, the voltage range of the method is increased and the steady-state current ripple is smaller. Finally, the effectiveness and reliability of the proposed method were verified by experiments.

关 键 词：模型预测控制 永磁同步电机 矢量合成 占空比调制 

分 类 号：TM351[电气工程—电机]