永磁同步电机模型预测转矩控制共模电压抑制研究

Research on Suppression Common-Mode Voltage of MPTC for PMSM

针对永磁同步电机模型预测转矩控制共模电压较大的问题,对比分析了磁链、转矩和共模电压共同控制、直接去除零电压矢量和虚拟零电压矢量三种抑制共模电压的方法。仿真结果表明,三种方法均可有效抑制共模电压。前两种方法均未采用零电压矢量,导致磁链脉动和转矩脉动增大;虚拟零电压矢量方法既保留了零电压矢量,又有效抑制了共模电压,但开关频率有所增大;动态虚拟零电压矢量选择开关次数最小的零电压矢量生成方式,可在控制性能基本相当的前提下,有效减小开关频率,综合性能最优。

Aiming at the problem of large common-mode voltage in model predictive torque control of permanent magnet synchronous motor,the common-mode voltage suppression effectiveness of three methods,namely,joint control of flux linkage,torque and common mode voltage,direct removal of zero voltage vector and virtual zero voltage vector,is analyzed comparatively.Simulation results show that all three methods can effectively suppress the common-mode voltage.The first two methods do not use zero voltage vector,resulting in increased flux linkage ripple and torque ripple.Virtual zero voltage vector method retains the zero voltage vector and effectively suppresses the common-mode voltage,but the switching frequency increases.Adaptive dynamic virtual zero voltage vector method selects the zero voltage vector generation method with the smallest number of switching times,which can effectively reduce the switching frequency under the premise of the basically equivalent control performance,with the optimal overall performance.