基于闭环扩张状态观测器的转子磁链观测

针对转子磁链观测易受转子电阻变化影响的问题,设计了一种基于闭环扩张状态观测器(ESO)的转子磁链观测器。该观测器将电流模型和电压模型中的不确定部分与已知模型分离,扩张为新的状态变量,并将转子磁链的观测值补偿到已知模型中,形成闭环的磁链观测器。这种闭环的ESO缩小了观测对象的不确定性范围,提高了ESO的收敛速度和观测精度。不同转速下的仿真结果表明,提出的ESO对转子电阻摄动具有很强的鲁棒性。

Rotor Flux Observer Based on Close Loop Extended State Observer

The variations of rotor resistance degrade the accuracy of rotor flux observer.A novel rotor flux observer based on the close loop extended state observer(ESO)method is proposed.The uncertainty partition of current model and voltage model is separated from the known models and extended to a new state.This observer compensate the observing value of rotor flux into the known models,which composes a closed loop rotor observer and improves the convergence speed and approximation precision of the extended state observer.Simulation results at both high and low motor speeds illustrate the accuracy and robustness of our proposed method.