永磁同步电机变频调速系统的内模控制

永磁同步电机是典型的非线性多变量强耦合系统,在同步旋转坐标系下dq轴电流存在耦合,传统的PI控制器无法实现解耦,提出一种基于内模控制原理和空间矢量算法相结合的高性能永磁同步电机解耦控制方法,用内模控制策略控制理想电机模型,对定子电流交叉耦合电势动态解耦,提高系统的动态响应性能,同时在整个电流闭环过程中对参数摄动和外扰动具有良好的鲁棒性,这种方法不需要额外的电机参数和检测硬件,实验结果验证了方法有效可行。

IMC of Variable-frequency Speed Control System of Permanent Magnet Synchronous Motors

The permanent magnet synchronous motor is a typical nonlinear multi-variable system with strong coupling.There is coupling with dq shaft current in the synchronous rotating reference frame,and the traditional PI controller cannot realize decoupling.This paper proposes a high-performance permanent magnet synchronous motor decoupling method combining internal mode control (IMC) and space vector algorithm.IMC strategy is used to control an ideal motor model to realize dynamic decoupling of the cross-coupling potential of the stator current to improve dynamic response of the system.In the meantime,this approach shows good robustness toward parameter perturbation and external disturbance in the whole process of current closed loop,and there is no need for additional motor parameter or test hardware.Experimental results verify that this approach is effective and feasible.