基于电压模型的定子磁链观测器及参数设计方法

基于电压模型的定子磁链观测中,通常采用一阶低通滤波器来替代纯积分环节,以消除积分环节对直流量的积累作用。但低速时在磁链观测上的误差,会直接影响直接转矩控制系统的效率和性能。介绍了3种基于电压模型的定子磁链观测器,给出原理框图,并进行仿真比较。此外,还结合仿真数据分析了低通滤波器截止频率的选择问题。

Stator Flux Linkage Estimator and Parameter Design Method Based on Voltage Model

In stator flux linkage estimator based on voltage model,an low-pass(LP) filter is normally used instead of pure integrator to avoid integration drift problem due to DC offset.In low speed region the LP filter estimator will degrade the performance and efficiency of the direct torque control system since it introduced magnitude and phase errors.Three stator flux linkage estimators based on voltage model are introduced in this paper,and the principle block diagram is presented.Furthermore,this paper analyses the selection of cut-off frequency of the low-pass filter connect to simulation data.