基于电压电流混合模型的新型磁链观测器

针对传统磁链观测器存在的积分饱和及直流漂移等问题,提出一种改进的电压电流混合模型磁链观测器。通过对定子磁链观测器的理论分析,对传统电压模型积分方法进行改进并结合电流模型磁链观测器,提出了基于电压电流混合模型的磁链观测器,可以在全速范围内观测到精确的定子磁链,解决了在不同转速下,直流偏置、幅值衰减和相位偏移等问题。混合磁链观测器在中速区存在相位误差,引进补偿环节,对混合模型的输出结果进行相位补偿,降低了饱和效应引起的误差影响,提高了磁链观测器的动态性能。通过仿真对比,验证了改进混合模型磁链观测器在永磁同步电机(PMSM)直接转矩控制中的可行性和优越性。

Novel Flux Observer Based on VoltageCurrent Hybrid Model

Aiming at the problems of integral saturation and DC drift in traditional flux observer, an improved voltagecurrent hybrid model flux observer was proposed. Through the theoretical analysis of the stator flux observer, the traditional voltage model integration method was improved. Combined with the current model flux observer, a voltagecurrent hybrid model flux observer was proposed, which could observe the accurate stator flux in the full speed range. The flux linkage solved the problems of DC offset, amplitude attenuation and phase shift at different speeds. The hybrid flux observer had phase error at the medium speed. To solve this problem, the compensation link was introduced to compensate the output of the hybrid model, which reduced the error caused by the saturation effect, and the dynamic performance of the flux observer was improved. The feasibility and superiority of the improved hybrid model flux observer in the direct torque control of permanent magnet synchronous motor were verified by simulation.