基于电压矢量幅值和相角为变量的表贴式永磁同步电机(SPMSM)定子磁链幅值和转矩表达式,给出了9个不同幅值和相角的备选电压矢量,采用预测控制计算得出施加不同电压矢量下一时刻的定子磁链幅值和转矩值,建立了基于磁链和转矩误差的目标函数,并选择使目标函数最小的电压矢量为作为下一时刻施加的最优电压矢量。仿真结果表明:在双变量预测控制下,SPMSM直接转矩控制系统运行良好,定子磁链轨迹为理想圆,磁链和转矩均符合控制要求,转速跟踪良好,定子电流波形正弦。进一步对比分析表明:与开关表和固定电压矢量选择策略相比,双变量预测控制能显著减小转矩和磁链脉动。与开关表相比,转矩脉动均方根误差降低了62.92%,磁链脉动均方根误差降低了45.05%,评价函数均值降低了60.30%；与固定电压矢量选择策略相比,转矩脉动均方根误差降低了22.40%,磁链脉动均方根误差降低了3.85%,评价函数均值降低了15.93%。

Based on flux and torque’s expressions of surface permanent magnet synchronous motor (SPMSM) direct torque control (DTC) system using the amplitude and angle of applying voltage vector as variables, 9 voltage vectors with different amplitudes and angles were used as selectable voltage vectors and values of stator flux and torque at next sampling point after applying these voltage vectors were given using predictive control. Object function based on flux and torque’s errors was proposed. The predictive control of the SPMSM DTC system selects the applying voltage vector which aims to minimize object function. Simulation results showed that compared with switching table, the average value of evaluation function was reduced by 60.30% and root mean square errors (RMSEs) of torque and flux’s ripples were reduced by 62.92% and 45.05%. Compared with fixed voltage vector selection strategy, the average value of evaluation function was reduced by 15.93% and RMSEs of torque and flux’s ripples were reduced by 22.40% and 3.85%. Therefore, compared with switching table and fixed voltage vector selection strategy, the proposed strategy could reduce evaluation function, stator flux and torque’s errors.

TM 341

国家自然科学基金项目(51207012)；陕西省工业科技攻关项目(2016GY069)；陕西省微特电机及驱动技术重点实验室开放基金项目(2013SSJ2002)；中央高校基本科研业务费专项资金项目(300102228201)