永磁同步电机预测电流控制的优化研究

Research on Current Predictive Control of Permanent Magnet Synchronous Motor

针对永磁同步电机预测控制中电流脉动较大,采用最优占空比预测控制优化算法,该方法较占空比预测控制的局部最优改进为从全局最优预测,利用评估函数对有效电压矢量与零矢量的最优分配进行选择,保证所选择输出的电压矢量全局最优,并对最优占空比控制算法进行优化改进,最后把转速的PI控制替换为滑模趋近率控制。仿真结果表明所提出的优化对电流脉动抑制明显,转速控制也具有良好的性能。

Aiming at the large current ripple in the predictive control of permanent magnet synchronous motors,the optimal duty cycle predictive control algorithm is used to improve the method.Compared with the duty cycle predictive control,the method is improved from global prediction,using the evaluation function to the effective voltage vector and duty cycle The optimal combination is selected to ensure that the final applied voltage vector is globally optimal,and the optimal duty cycle control algorithm is optimized and improved.Finally,the PI control of the speed is replaced by the sliding mode approach rate control.The simulation results show that the proposed optimization has obvious suppression of the current ripple and the speed control also has good performance.