基于准比例谐振控制器的5相感应电机电子变极研究

Electronic Pole-Changing of Five-Phase Induction Motor Based on Quasi-Proportional Resonant Current Controller

针对采用传统比例积分(PI)电流控制器的5相感应电机(FIM)电子变极过程中存在转矩、转速动态响应慢和波动大的问题,设计了一种准比例谐振电流控制器(QPR)控制FIM电子变极。设计的QPR控制器在传统比例谐振控制的基础上进行了阻尼项修正,实现了电流的无静差跟踪。加入相应的谐波抑制算法以改善电机变极切换过程中的抖动问题,同时在变极前后获得了更好的稳态性能。采用变参数化设计QPR控制器实现了谐振频率点随电机转速的自适应变化。使用预修正Tustin变换的离散化方法,保证了QPR控制的稳定性和谐振频率的无偏差。随着电机运行平面的改变切换谐振频率,实现了电子变极前后的两段式精确控制。实验结果表明:所提方法有效提高了FIM电子变极过程中的转矩和转速动态响应性能并减小了其波动。

The five-phase induction motor(FIM) using the traditional proportional integral(PI) current controller has the issues of slow dynamic response and large fluctuations of torque and speed during the pole-changing process.To solve these issues, a quasi-proportional resonance controller(QPR) is designed to control the electronic pole-changing of FIM.The designed QPR controller modifies the damping term on the basis of the traditional proportional resonance control, and realizes the static error free tracking of current.The shake problem in the switching process was improved by adding the corresponding harmonic suppression algorithm.At the same time, steady-state performance was achieved before and after the electronic pole-changing.The adaptive change of resonant frequency points with the motor speed was realized by adopting the variable parameter to devise the QPR controller.Discretization method with pre-modified Tustin transform was used to ensure the stability of the QPR control and unerring resonant frequency.The resonant frequency was switched with the change of the motor operating plane, realizing the two-stage precise control before and after the electronic pole-changing.The results of the experiment indicate that the method presented effectively raises the dynamic response performance of torque and speed and reduces their fluctuations during the FIM electronic pole-changing process.