基于双曲正切函数的非线性PI控制器及其在感应电动机矢量控制中的应用

提出了一种基于双曲正切函数的非线性PI控制器,将它用于感应电动机矢量控制系统的速度控制.根据模态等效原理,证明了该非线性PI控制器与某种模糊逻辑控制器的近似等效性,但在实现方面却比模糊控制器简单得多,同时克服了模糊控制器固有的高频抖振缺点.仿真和实验结果均证明了该非线性PI速度控制器在感应电动机的矢量控制中具有较好的控制性能.

A Nonlinear Pl Speed Controller Based on Hyperbolic Function and Its Application in the Vector Control of an Induction Motor

The indirect field-oriented control system of an induction motor is still coupling and nonlinear. It is not satisfied to control the speed of the induction motor based on field-oriented control using conventional PI control. In order to improve the dynamic characteristics of above motor drive, a nonlinear PI type speed controller based on hyperbolic tangent function was presented, and applied in the indirect vector control of an induction motor. According to modal equivalence principle, it is proved that the controller is equivalent to a robust fuzzy logic controller. However, comparing with Fuzzy Logic Control(FLC), the nonlinear controller has some advantages such as simple implementation, no high-frequency quiver etc. Simulations and experiments results demonstrate goed dynamic performance can be achieved based on this nonlinear PI speed controller in the vector control of induction motor.