一种新型变结构直接转矩控制方案研究

Research on a New Method of Variable Structure Direct Torque Control

针对感应电机直接转矩控制系统磁链和转矩波动大、逆变器开关频率不固定等问题,提出一种新型变结构控制直接转矩控制方案,利用变结构应对系统外部扰动和参数摄动的鲁棒性,来改善系统的动态和稳态性能。结合电机数学模型设计了相应的控制律,通过Lyapunov分析证明了系统的全局渐近稳定性,以仿真结果证实了这一点。

Against the problem of big ripple of flux and torque in DTC control of the induction motor as well as the unfixed switching frequency of the inverter, a new type of variable structure DTC control program was introduced. The variable structure DTC had good robustness to the parameter uncertain and other disturbance outside of system, so as to improve the dynamic and static performance of the system. According to mathematic model of the induction motor, the control law was designed and global asymptotic stability of the system was proved in the Lyapunov sense. Simulation result confirmed its validity and feasibility.