表贴式永磁同步电机直接转矩控制变角度预测控制

基于以电压矢量相角为变量的表贴式永磁同步电机(SPMSM)磁链和转矩方程,采用预测控制计算得出施加不同电压矢量相角的下一时刻磁链和转矩值,选择使磁链和转矩误差目标函数最小的电压矢量相角作为最优值,从而确定下一时刻施加的电压矢量。仿真结果表明:在电压矢量变角度预测下,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,定子电流波形为正弦。研究了不同等分电压矢量相角选择区域方式下变角度预测控制系统的控制效果。综合考虑控制效果和计算负担,变角度预测控制下将相角选择区域四等分比较理想。

Predictive Control of Surface Permanent Magnet Synchronous Motor Direct Torque Control System Using Voltage Vectors with Variable Angle

Based on the expressions of flux and torque of surface permanent magnet synchronous motor (SPMSM) direct torque control (DTC) system with the angle of applying voltage vector as the variable, the values of stator flux and torque at the next sampling point after applying voltage vector with different angle were given. The objective function of flux error and torque error was proposed. The predictive control would select the optimal angle which minimized the objective function. Simulation results showed that the SPMSM DTC system under the control of proposed strategy worked properly. Control performances of SPMSM DTC system were given using different partitioning methods of voltage vector selection area. Considering control performance and calculation burden, quartering the voltage vector selection area was an ideal way.