新型速度自适应磁链观测器在矢量控制中的应用

将一种全阶磁链闭环观测器应用于矢量控制系统中,取代了传统的纯积分器,经过仿真分析得知该磁链观测器对转子磁链的观测精度高,对于电机参数的鲁棒性较好,在电机低速运行时仍能实现对转子磁链准确的观测.在此基础上根据李亚普诺夫理论,成功地设计出两种电机转速的自适应辨识方案,以1.1kW异步电机为控制对象,并采用MATLAB/SIMULINK软件对系统进行了仿真.仿真结果表明两种方案的稳态性能差别不大,第一种自适应方案的收敛速度快,动态性能更好.

New Speed Adaptive Flux Observers For Vector Control of Induction Machine

A full order flux observer of an induction motor is proposed to replace the classical pure integrator in the vector control system.The simulation shows that the observer gives very satisfactory estimation result of rotor flux,especially at lower speed.According to Lyapunov's theorem,two adaptive speed identification methods are designed successfully.The methods have been implemented in a 1.1kW induction motor with MATLAB/SIMULINK.The results of simulation with these two methods have shown that the first adaptive method is faster than the another in the convergence rate of speed,but their steady performance is similar.