基于参考电流斜率的永磁同步电机三矢量模型预测电流控制

Three-Vector Model Predictive Current Control for Permanent Magnet Synchronous Motor Based on Reference Current Slope

永磁同步电机(PMSM)传统模型预测电流控制(MPCC)策略由于输出电压矢量幅值及相位无法调节,导致其稳态性能较差。提出了一种基于参考电流斜率的三矢量模型预测电流控制策略。该方法将参考电流斜率与基本电压矢量电流斜率进行比较,无需使用价值函数遍历所有的电压矢量,即可选择出两个有效电压矢量,并与零电压矢量以一定的占空比组合,合成输出的电压矢量能够覆盖一定范围内的任意幅值、任意相角,且该策略相较于传统模型控制显著减少了系统整体计算量。仿真结果表明,相较于传统模型预测电流控制策略,所提控制策略可有效减小电流脉动,提高系统的稳态性能。

The traditional model predictive current control(MPCC)strategy of permanent magnet synchronous motor(PMSM)has poor steady-state performance due to the inability to adjust the amplitude and phase of the output voltage vector.A three-vector model predictive current control strategy based on the reference current slope is proposed.The reference current amplitude slope is compared with the basic voltage vector current amplitude slope.Without using an evaluation function to traverse all voltage vectors,two effective voltage vectors can be selected and combined with the zero voltage vector at a certain duty cycle.The synthesized output voltage vector can cover any amplitude and phase angle within a certain range.This strategy significantly reduces the overall system computation compared to the traditional model control.The simulation results show that compared to traditional model predictive current control strategy,the proposed control strategy can effectively reduce current ripple and improve the steady-state performance of the system.