基于虚拟矢量的双三相永磁同步电机预测电流控制策略

Predictive current control strategy of dual three-phase permanent magnet synchronous motor based on virtual vector

针对双三相永磁同步电机传统有限集预测电流控制策略中存在电流谐波较大的问题,提出了一种基于虚拟矢量合成的预测电流控制策略。在保证原有良好动态响应能力的基础上,选用基波子平面内大矢量和次大矢量合成的虚拟电压矢量用于预测控制,将谐波子平面的电压幅值抑制为零,然后通过构建价值函数选择出最优虚拟电压矢量,在抑制电流谐波的同时也减小了计算量。由仿真结果可知,所提策略有效抑制了5、7次电流谐波,改善了电流波形,使相电流的总谐波失真降低了49.5%。

Aiming at the problem of large current harmonics in the traditional finite control set model predictive current control of dual three-phase permanent magnet synchronous motor,the predictive current control strategy based on virtual vector synthesis is proposed.On the basis of guaranteeing the original dynamic response capability,the proposed strategy selects the virtual voltage vector composed of large vectors and sub-large vectors in the fundamental sub-plane for predictive control,suppresses the voltage amplitude of the harmonic sub plane to zero,and then selects the optimal virtual voltage vector by constructing a cost function,which can suppress the current harmonics and reduce the computational burden.The simulation results show that the proposed strategy effectively suppresses the fifth and seventh harmonics,improves the current waveform,and reduces the total harmonic distortion(THD)of the phase current by 49.5%.