异步电机降阶磁链观测器的研究

Reduced order flux observer for induction motors

为提高转子磁链观测精度 ,文章详细分析了异步电机矢量控制系统中的主要干扰和参数误差 ,在此基础上 ,依据 H∞ 理论设计了降阶磁链观测器 ,使干扰和参数误差造成的影响极小化。文章通过仿真和实验将该降阶磁链观测器与传统的电压型和电流型磁链观测器进行了比较。仿真和实验结果表明 ,前者具有较好的动态和稳态性能 ,对电机中的参数变化、量测噪声和观测器初始值误差具有较强的鲁棒性 。

Field oriented control has emerged as an important approach for the control of induction motors with the estimation of rotor flux from the terminal variables as a key step in the most popular implementations of such a system. The disturbance and parameter variations of a vector controlled induction motor system driven by a three level inverter were analyzed to develop a reduced order flux observer using H ∞ theory, which can minimize the estimation error. Simulation and experimental results show that this flux observer gives better performance during steady state and transient processes than traditional current based and voltage based methods and is of more robust against parameter variations and converges faster.