基于MRAS的改进型转速估计法  

Improved Speed Estimation Method Based on MRAS

作　　者：刘建[1] 赵华东[1] 王俊鹏[1] 王若羽[1] 辛双志 

机构地区：[1]山东科技大学电气与自动化工程学院,山东青岛266590

出　　处：《电力科学与工程》2017年第5期1-5,共5页Electric Power Science and Engineering

摘　　要：针对传统的MRAS转速估计在低速范围内误差较大,不能实现转速精确跟随问题,采用电流模型经过PI运算补偿电压模型,并改进电压型模块,对反电动势的直流部分产生的误差由励磁电流计算而来的转子磁链滤波信号补偿;交变部分,采用饱和反馈进行补偿,以观测到的转子磁链做输入,经过限幅后反馈,补偿转子磁链以降低相位和幅度失真。另外考虑电磁转矩误差,两者并行估计反馈。通过MATLAB/SIMULINK验证此方法能有效减小低速范围内的转速估计误差,实现转速精确跟随,并具有更强的鲁棒性。In view of problem of the relatively big error of the traditional MRAS speed estimation in low speed range and its failure in accurate speed following, a current model is built in this paper which goes through a PI arithmetic compensation voltage model. The voltage type module is improved, and the error produced by the counter electromotive force in de part is compensated by the field current of rotor flux linkage filtering signal. As for alternating part, the sat- urated feedback is used for compensation and the observed rotor flux for input. After amplitude limiting, the signal is fed back to compensate the rotor flux to reduce the phase and amplitude distortion. Meanwhile, considering the electro- magnetic torque error, these two estimate feedbacks run in parallel. The proposed method is verified by simulation in MATLAB/SIMULINK software, which can effectively reduce the speed estimation error in low speed range and realize speed following accurately, and has better robustness.

关 键 词：MRAS 转速估计 鲁棒性 

分 类 号：TM343[电气工程—电机]