感应电机DTC转矩与磁链模糊PI自校正控制

Fuzzy PI Self-tuning Control of Flux and Torque of Induction Motor DTC

为克服传统感应电机直接转矩控制存在低速转矩脉动和开关频率不固定等问题,设计了基于转矩与磁链模糊PI自校正控制器以降低转矩脉动。该控制器根据转矩与磁链误差和误差变化率,实时在线调整控制参数,改善转矩与磁链控制性能。在此基础上提出12个细分电压矢量DTC空间矢量调制控制方案。该方案利用细分的12个电压空间矢量合成需要的任意电压空间控制矢量。仿真与实验结果表明:该系统获得转矩与磁链更精细的控制,降低了电机低速转矩脉动,提高DTC系统的自适应能力。

In order to overcome torque ripple at low speed and switching frequency uncertainty of the tradition at Direct torque control （DTC）, self-tuning fuzzy PI controller based on flux and torque was designed to reduce the torque ripple, which is based on error and error change rate of flux and torque, control parameters are real- time online adjusted to improve control performance of torque and flux. On this basis, a control scheme with twelve voltage space vector DTC space vector modulation was presented. Any required voltage space control vector could be synthesized using the subdivision twelve voltage space vectors. Simulation and experimental re- sults show that the system can obtain more precise control of torque and flux, reduce torque ripple at low speed and improve ability of adaptive control of the DTC system.