感应电机直接转矩控制系统的转矩脉动极小化方法

Torque ripple minimization of direct torque control system for induction motor

针对感应电机直接转矩控制系统在稳态运行时转矩脉动大的问题,提出了一种转矩脉动抑制方法。基于离散化的感应电机模型,分析了直接转矩控制系统的转矩脉动机理。以转矩误差均方根极小为目标,将采样周期分为非零电压矢量作用时间段和零电压矢量作用时间段,推导了最优电压矢量切换时间的计算公式。仿真和实验结果表明所提方法可有效减小直接转矩控制系统的转矩脉动。

Aiming at the large torque ripple of the direct torque control system for induction motor during the steady-state operation,a torque ripple suppression method is proposed. The mechanism of the torque ripple of direct torque control system is analyzed based on the discrete model of induction motor. With the minimum RMS torque error as the objective,a formula for calculating the optimal voltage vector switching moment is deduced by dividing the sampling period into the non-zero voltage vector section and the zero voltage vector section. Simulative and experimental results show that the proposed method significantly reduces the torque ripple of the direct torque control system.