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针对牵引电机低速运行下磁场定向控制系统中磁链精度较低的问题,对现有磁链观测模型的优化进行了研究。首先在基于低通-高通滤波的电压磁链观测模型基础上加入误差补偿环节,并提出了先补偿后滤波新型结构的改进型电压模型,解决了观测磁链在直流偏置、幅值和相位的误差问题;为进一步提升模型的动态响应性能和磁链观测精度,通过串入电流模型,并通过中间环节PI控制器形成了基于电压电流混合控制的磁链观测优化模型;最后通过仿真建模分析,验证了所提优化模型在抑制直流偏置误差以及提升动态响应与磁链精度方面的有效性,并通过在电机矢量控制系统中的仿真应用,进一步验证了该模型在牵引电机低速运行时不同工况切换下优良的稳态和动态响应性能。
Aiming at the low accuracy of the flux linkage in the field oriented control system of traction motor at low speed, the optimization of the existing flux linkage observation model is studied. First of all, based on the low-pass and high-pass filter voltage and flux observation model, an error compensation loop was added, and an improved voltage model of the new structure was first compensated and filtered to solve the problem that the flux linkage in DC bias, amplitude and phase In order to further improve the model’s dynamic response performance and the accuracy of flux observation, a flux-linkage optimization model based on voltage-current-mixing control was established by the in-line current model and through the intermediate PI controller. Finally, The validity of the proposed model in suppressing the DC bias error and improving the dynamic response and flux linkage accuracy is verified and verified. The simulation of the motor vector control system is used to verify the effectiveness of the proposed model when the traction motor operates at low speed Different conditions switching under excellent steady-state and dynamic response.