异步电动机直接转矩控制的仿真与分析

Simulation and Analysis on Direct Torque Control for Induction Motors

在研究和分析直接转矩控制原理的基础上,利用图形仿真工具Matlab/simulink完成了直接转矩控制系统的六边形磁链控制方法和近似圆形磁链控制方法的仿真实验。结合直接转矩控制的算法,通过改变控制系统中直接影响电机性能的转矩滞环调节器和磁链滞环调节器的参数,对仿真结果进行了具体分析。验证了直接转矩控制系统方法的可行性和有效性,并且分析了参数的改变对电机运行性能的影响,同时给出了在基速范围内两种控制方法实现平滑切换的仿真结果。

Base on the research and analysis on thedirect torque control theory, by the use of the graphical simulation tool-MATLAB/simulink , the simulation experiments on the two methods of the direct torque control system, which are hexagon and approximate rotundity flux linkage control methods, were made in this paper. By the algorithm of direct torque control and adjusting the parameters of the torque hesteresis adjustor and flux linkage adjustor, which can directly affect the performance of the induction motors, the simulation outcome was analyzed, and the feasibility and the validity of the direct torque control theo-rywere validated. The changes of the parameters' affection on performance of the electric engine was farther analyzed . At last the smooth switch in the range of fundamental between the two kinds of controlsimulations was given.