多相感应电机电子变极电流控制策略

Current Control Strategy of Electronic Pole-Changing for Multiphase Induction Motors

针对多相感应电机斜坡响应电子变极过程中,电机转速跌落和转矩波动较大的问题,采用了基于滑模变结构电流控制的多相感应电机电子变极方法。文中对PI和滑模变结构控制两种电流控制策略进行了比较分析,在多相感应电机矢量控制基础上,用滑模变结构电流控制器替代传统的PI控制器分别控制d轴和q轴电流,解决了电子变极过程中PI电流控制跟踪电流斜坡输入存在的滞后性问题。并以五相感应电机为例,对提出的方法进行验证,实验结果表明提出的方法能有效改善多相感应电机电子变极过程中的转矩和转速波动。

In order to reduce torque and speed fluctuations during electronic pole-changing transition of a multiphase induction machine, a current control strategy based on sliding mode control （SMC） is adopted. In this paper, the traditional PI and sliding mode current control strategies are compared. The sliding mode current controller displaces traditional PI controller to control d-axis and q-axis currents by vector control, which is designed to solve the lag problem of tracking the input ramp signal. The proposed strategy is verified by an experiment of a 5-phase induction machine （IM）. The experimental results show that the proposed strategy can reduce torque ripple and speed fluctuations during the transition of pole-changing.