基于转子磁链误差的MRAS速度观测器优化设计

Improved Speed Observer of MRAS Model Based on Error of Rotor Flux Linkage

传统的MRAS系统中的电压模型采用对反电动势直接积分得到转子磁链,由于直流偏差等误差会造成磁链估算不准,尤其在低速时严重影响系统精度。在详细分析误差各组成部分的基础上,提出一种改进型电压模型,通过高通滤波器对直流偏差等进行过滤,并通过补偿装置对相位误差进行补偿。利用Simulink搭建仿真模型进行实验,证明该模型在全速范围内均可获得较好的效果。

The rotor flux linkage is the pure integral for back electromotive force （back-EMF） in the traditional voltage model of MRAS system, the flux linkage estimation are inaccurate because of error such as dc error, it seriously affect the system precision at low speeds.The paper analyzes the composition of the error,and propose a inproved voltage model.In the model, the high-pass filter filter dc offset and th compensation part compensate flux linkage error. The system was simulated in Simulink, and the result showed that the model had highly valid in full speed range.