一种改进的永磁电机无差拍预测控制方法

摘要

To solve the delay and inverter non-linearity problems in the digital control system and increase the current-loop performances,basing on the discrete mathematic model of PMSM,this paper proposed an improved deadbeat predictive control method introducing delay compensation and voltage compensation at the same time.In one cycle,realize two steps calculation to compensate delay,and then considering voltage change causing by the non-linearity and dead-time of inverter to compensate the voltage.Comparing to the basic predictive method,this improved method could promote the dynamic response and steady-state accuracy,reduce the parameter sensitivity.%为解决数字控制方式固有的延时和开关非线性问题,提升电流环性能,本文基于永磁同步电机离散化数学模型,提出一种同时引入延时补偿和死区补偿改进无差拍电流预测的控制方法.在一个周期内,实现双步计算来补偿延时作用,并考虑逆变器开关的非线性及死区时间引起该周期内电压的变化进行电压补偿.相较于基本的预测方法,改进方法能够有效地提升动态响应和稳态精度,降低参数敏感性.