基于变参数PI和模糊控制的直接转矩控制

摘要

针对传统永磁同步电机(PMSM)直接转矩控制系统中存在定子磁链和电磁转矩脉动的缺点,提出一种基于变参数PI和模糊控制的直接转矩控制方法,将传统直接转矩控制系统中PI速度调节器和滞环比较器分别用变参数PI速度控制器和模糊控制器代替.介绍了变参数PI和模糊控制的原理和设计方法,最后构建了改进后系统控制框图,并进行了实验验证,结果表明新系统具有更好的动、静态性能,减少了转矩和磁链的脉动.%This paper discusses that conventional direct torque control system of permanent magnet synchronous motor exists in the stator flux linkage and electromagnetic torque ripple faults,and puts forward a direct torque control method based on variable parameter PI and fuzzy control, which uses variable parameter PI controller and fuzzy controller respectively to replace PI speed regulator and hysteresis comparator of the conventional direct torque control. The paper presents the principle and design method of variable parameter PI controller and fuzzy controller,constructs the improved system control diagram,and carries on the experimental analysis finally.The experimental results show that the new system has better dynamic and static performance, reduce the torque and magnetic flux pulsing.