利用定子磁链检测器的异步电机直接转矩控制系统调速方案

直接转矩控制广泛应用于异步电机调速系统中，但其磁链模型中积分环节迟滞偏移较大，以致转矩和定子电流都含有很强的脉动分量。提出了三电平供电定子磁链全速检测的异步电机直接转矩控制系统调速方案，通过在定子磁链观测模型中加装高通滤波器和低通滤波器，实现对定子磁链和转矩的全速跟踪，有效地改善了异步电机直接转矩控制系统的低速运行状况，并通过仿真验证了方案的可行性和有效性。

The Speed Regulation Scheme of Direct Torque Control System with Flux Observer for Asynchronous Motor

Direct torque control (DTC) is widely used in asynchronous motor speed regulation system, but there is a problem that the hysterisis offset of the integrator in flux linkage observer is so large that both the torque and stator current have a strong flutter component. This paper proposes a novel speed regulation scheme for asynchronous motor DTC with full-speed detection of stator flux and fed by three-level inverter. The proposed scheme can track the flux linkage and torque in the entire speed range and effectively improve the low speed performance of DTC control systme for asynchronous motor through adding high pass filter and low pass filter in the stator flux linkage model. And simulation results demonstate the effectiveness and validity of the proposed scheme.