模糊控制在直线感应电机磁场定向控制中的应用

单边直线感应电机相当于旋转电机沿半径剖开并平展,性能与旋转电机类似,但由于受纵向边端效应影响,电机参数,尤其是励磁电感,随电机运行速度和滑差而改变。对于该非线性时变系统,传统PI控制难以满足高性能的要求。模糊控制不依赖控制对象的具体数学模型,能模仿人的思维对电机驱动系统进行智能控制。结合PI控制和模糊控制的优点,设计了模糊自适应PI控制器,并将其应用于单边直线感应电机转子磁场定向控制中,以研究电机的特性。大量仿真结果表明,该方法能有效消除控制参数的稳态误差,同时具有较好的暂态性能。

Field Oriented Control of Linear Induction Machine Based on Fuzzy Control

Because the single-sided linear induction machine(SLIM) is equivalent to a rotary machine cut open and rolled flat,they are with similar performance.However,by the reason of longitudinal end effect,the parameters of SLIM,particularly excitation inductor,are changeable when the machine runs.For such a nonlinear and time-varying system,conventional PI control can not meet the requirement of high performance.Fuzzy control doesn’t depend on the mathematical model of the controlled object,and is able to imitate human thinking to control the object intelligently.Combining the advantages of PI control and fuzzy control,a fuzzy self-adapting PI controller was designed,which was applied in the rotor field oriented control of SLIM in order to study the properties of SLIM.Simulations showed that the proposed control method is able to eliminate the steady-state error effectively and has better performance of transient state.