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中文摘要：
在直接转矩控制电压模型定子磁链观测器中，常用一阶低通滤波器代替纯积分器，解决纯积分环节存在的直流偏移和初始值误差，但却在磁链观测中产生了幅值和相位误差，使得估算的定子磁链不准确。一种新型的基于模糊截止频率可调的改进型积分器定子磁链观测器采用模糊控制器，根据感应电机的运行状态实时在线地调整低通滤波器的截止频率，减小了由于使用低通滤波环节而带来的磁链幅值和相位误差，从而提高了磁链观测的精度。在MATLAB6．5／SIMULINK下．对基于模糊截止频率可调的定子磁链观测器的直接转矩控制进行了仿真，仿真结果验证了这种方法的有效性。
英文摘要：
In voltage - model - based flux estimation of direct torque control system, a low - pass filter is normally used instead of a pure integrator to avoid the errors caused by the DC drift and initial value. But the estimated stator flux becomes inaccurate since it introduces magnitude and phase errors. A new stator flux observer based on modified integrator with variable cutoff frequency is proposed in this paper. Utilizing a fuzzy controller, the cutoff frequency of low - pass filter can be adjusted in real time according to the online motor operating states. Consequently, it can eliminate the magnitude and phase errors caused by low - pass filter and improve the precision of stator flux estimation efficiently. The simulation scheme of direct torque control based on a new stator flux observer with variable cutoff frequency is built in the Maflab6.5/Simulink, Its feasibility is verified by the simulation results.
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