基于动态数学模型转速磁链闭环异步电动机矢量控制系统的设计与研究

Designand Research of Vector Control System of Rotational Speed Flux Closed-Loop Asynchronous Motor Based on Dynamic Mathematical Model

根据三相异步电动机在三相静止坐标轴系(ABC)上的数学模型,可以确定三相异步电动机是一个非线性强耦合的复杂系统。为了对其实现矢量控制,在转子磁链定向的条件下,通过坐标轴系变换得到异步电动机在旋转坐标轴系(MT)上线性解耦的动态数学模型,并在此基础上构建具有转矩内环的转速、磁链闭环矢量控制调速系统。为进一步提升控制性能,在系统中又增设了磁链观测器环节和电流滞环比较器环节。通过仿真,结果表明:该矢量控制调速系统具有响应速度快、抗干扰能力强、鲁棒性好等良好性能。

According to the mathematical model of the three-phase asynchronous motor on the three-phase static axis system(ABC),it can be determined that the three-phase asynchronous motor is a nonlinear and strongly coupled complex system.In order to achieve vector control,the dynamic mathematical model of linear decoupling of asynchronous motor on rotating axis system(MT)is obtained by means of coordinate shafting transformation under the condition of rotor flux orientation,and the speed and flux closed-loop vector control speed regulation system with inner torque loop is constructed on this basis.In order to further improve the performance of the control system,the link of flux observer and current hysteresis comparator are designed.The simulation results show that the vector control speed regulation system has good performance such as fast response speed,strong anti-interference ability and good robustness.