级联H桥逆变器驱动永磁同步电机的鲁棒预测电流控制策略

Robust Predictive Current Control for PMSM Fed by CHB Inverter

该文针对预测电流控制在多电平逆变器中对参数敏感以及选择矢量繁琐的问题,提出一种适用于级联H桥逆变器驱动永磁同步电机(permanent magnet synchronous motor,PMSM)的鲁棒预测电流控制策略。首先,基于滑模理论提出一种多参数整合的观测器。为了消除电阻和永磁体磁链误差的影响,该观测器将参数扰动项与含有电阻、磁链的项进行整合,并用观测项对预测模型进行实时补偿。同时为了抑制滑模抖振,采用一种参数可调的连续函数作为趋近率,进而得到可以抑制抖振和具有鲁棒性的参考电压。然后,根据对参考电压在多电平空间中所处区域的判定,可以直接得到最优两矢量及其占空比,且计算过程与电平数无关。最后,通过仿真和实验对本文所提方法的可行性和有效性进行了验证。

In order to solve the problems that predictive current control was sensitive to parameters of motor and the vectors selection was cumbersome,a robust predictive current control strategy for permanent magnet synchronous motor(PMSM) fed by cascaded H-bridge(CHB) inverter was proposed in this paper.First,an observer of multi-parameter integration was proposed based on sliding mode theory.In order to eliminate the influence of resistance error and flux error,the observer integrated the term of disturbance with the terms containing resistance and flux,and the results were used to compensate the predictive model.Besides,a continuous function with adjustable parameters was used as the reaching law and then a reference voltage with chattering suppression and robustness was obtained.Then,according to the region of the reference voltage,the optimal two vectors and their duty cycles could be obtained directly.The calculation process was independent of the level number.Finally,the practicability and validity of the proposed method were verified by simulation and experiment.