MIAO Zhongcui, LI Haiyuan, HE Yangyang, WANG Yunkun
（School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China）
Abstract： Aiming at the difficulty of setting the weight coefficient in the value function of model predictive torque control (MPTC) for permanent magnet synchronous motor (PMSM) driven by three-level inverter, a fine-division model predictive flux control (MPFC) method is proposed. First, establish a mathematical model between the motor torque and the stator flux linkage according to the mathematical equations of PMSM. Thus, the control of the motor torque and stator flux linkage in the MPTC is transformed into the control of a single stator flux linkage vector, omitting the cumbersome weight setting process in the traditional MPTC. The midpoint potential control strategy is proposed, which uses the characteristics of redundant small vectors to balance the midpoint potential. After that, a fine-division strategy is proposed, which effectively reduces the number of candidate vectors and the computational burden of the system. Finally, the proposed MPFC is compared with MPTC by simulation. The results show that the proposed fine-division MPFC effectively reduces the system calculation, and has the advantages of simple principle and better dynamic and steady-state control performance. The feasibility of the control strategy is verified.
Key words： permanent magnet synchronous motor (PMSM)； three-level inverter； model predictive flux control (MPFC)； weight coefficient； midpoint potential
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基于精细分区的的永磁同步电机三电平模型预测磁链控制
缪仲翠， 李海源， 何阳阳， 王运坤
（兰州交通大学 自动化与电气工程学院， 甘肃 兰州 730070）
摘要:针对三电平逆变器驱动的永磁同步电机（PMSM）模型预测转矩控制（MPTC）价值函数中存在的权重系数整定困难问题， 本文提出一种基于精细矢量分区的预测磁链控制（MPFC）方法。 首先利用PMSM的数学方程建立电机转矩与定子磁链之间的数学模型， 将MPTC中对电机转矩以及定子磁链的控制转换成单一的定子磁链矢量控制， 省去了传统MPTC中繁琐的权数调定过程。 并提出了中点电位控制策略， 利用冗余小矢量的特性对中点电位进行平衡。 然后， 提出了一种精细矢量分区策略， 有效减少备选矢量的数量， 减少系统的计算负担。 最后通过仿真将MPFC与传统MPTC进行对比， 结果表明提出的精细矢量分区MPFC有效降低了系统计算量， 并具有原理简单动稳态控制性能更好的优点， 验证了该控制策略的可行性。
关键词:永磁同步电机（PMSM）； 三电平逆变器； 模型预测磁链控制（MPFC）； 权重系数； 中点电位
引用格式：MIAO Zhongcui， LI Haiyuan， HE Yangyang， et al. Model predictive flux control of permanent magnet synchronous motor driven by three-level inverter based on fine-division strategy. Journal of Measurement Science and Instrumentation， 2022， 13（4）： 439-450. DOI： 10.3969／j.issn.1674-8042.2022.04.007
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