一种改进的感应电机直接转矩控制方法

Based on Direct Torque Control of Induction Motor Improvement Method

提出了一种改进的基于空间矢量调制技术的直接转矩控制算法(SVM-DTC),并应用于感应电机控制系统。该方法通过控制转差速度,并对定子磁链的幅值与相角进行解耦来获得定子空间电压矢量。在给定的采样时间内,磁链和转矩误差都由定子磁链参考值估算出的空间电压矢量控制。转矩的控制由瞬时转差角速度和定子磁链角速度计算出的定子磁通角参考值来实现。最后通过Matlab仿真和实验验证该方法在感应电机控制系统中有更好的鲁棒性,能有效减小误差、降低谐波含量。

An improved technology based on space vector modulation direct torque control algorithm （SVM- DTC） was presented, which is used in induction motor control system. This method is based on control of slip speed and decoupled between amplitude and angle of reference stator flux for determining required stator voltage vector. Within the given sampling time, flux as well as torque errors are controlled by stator voltage vector which is evaluated from reference stator flux. The direct torque control is achieved by reference stator flux angle which is generates from instantaneous slip speed angular frequency and stator flux angular frequency. Finally, the proposed control scheme is verified by Matlab simulation and experiment, which shows that the method is more robust in the induction motor control system, can effectively reduce the error and harmonic.