改进转速辨识方法用于矩阵变换器交流调速

Improved speed estimation method applying to AC speed-control of matrix converter

传统的参考磁链和估计磁链分别通过电机的电压模型和电流模型直接积分获得,但积分存在累计误差大和响应延时等缺点,使得磁链观测结果不够快速准确,导致转速辨识和系统调速性能不是很理想。为克服这一缺点,提出将线性预测控制与模型参考自适应相结合的转速辨识方法。预测控制原理简单,易于实现,通过简单的超前一个采样周期预测,即可实现参考磁链和估计磁链的无差拍控制。仿真结果表明,基于预测控制和模型参考自适应的转速辨识方法应用于矩阵变换器驱动感应电机具有较好的转速辨识和系统调速性能,克服了积分方法获得磁链信息存在的缺点。

Traditional rotor flux information is obtained by using integral control based on voltage model and current model,which results in rotor flux with large error and low response speed,and low precision and low response speed of estimated speed. To avoid the defects of the rotor flux information obtained by integral controller,the estimated speed method with combining predictive control with model referenced adaptive system was put forward. The predictive control has advantages of simple principle and easy to realize,the deadbeat control of the referenced rotor flux and model rotor flux can be realized by simply predicting ahead of one sample period. The simulated results indicate that the system not only has good performances of the estimated speed but also of speed regulation by using proposed estimated speed method when applying to indirect vector control of induction motor fed by matrix convert.