基于模糊控制的动态权重系数表贴式永磁同步电机模型预测转矩控制系统

传统永磁同步电机(PMSM)模型预测转矩控制(MPTC)未考虑减小开关次数,造成平均开关频率较高。通过将减小开关次数作为表贴式永磁同步电机(SPMSM)MPTC的控制目标之一,设计了开关次数权重系数,提出了一种基于模糊控制的动态权重系数MPTC方法。分析了电机转矩的不同对成本函数开关次数权重系数作用效果的影响,引入模糊控制,根据系统状态信息实时调节成本函数开关次数的权重系数。仿真结果表明,与开关次数权重系数固定的成本函数相比,所提方法进一步降低了平均开关频率,同时抑制了系统转矩脉动与磁链脉动。

Model Predictive Torque Control of SPMSM with Dynamic Weight Coefficient Based on Fuzzy Control

Conventional model predictive torque control (MPTC) of permanent magnet synchronous motor (PMSM) does not concern decreasing switching number, which causes high average switching frequency. The decrease of switching number is considered in the MPTC of surface permanent magnet synchronous motor (SPMSM) as one of the control objects of cost function, and weight coefficient of switching number is designed. The MPTC strategy with dynamic weight coefficient based on fuzzy control is proposed. The effect of different motor torque on switching number weight coefficient is analyzed. Fuzzy control is introduced to adjust the weight coefficient of switching number in real time according to motor system states. Simulation results show that compared with constant weight coefficient of switching number, dynamic weight coefficient based on fuzzy control can reduce the average switching frequency and suppress the torque ripple and flux linkage ripple of system.