异步电机效率优化控制及动态响应研究

Study on Efficiency Optimization Control of Induction Motor and Dynamic Response

针对异步电机效率优化问题,在黄金分割法和模糊搜索控制法的基础上,提出了一种新型混合控制方法。该方法在模糊控制中设计了合理的比例因子和隶属度函数,保证了在初始阶段搜索步长,根据电机工况进行在线调整,减小了电磁转矩的波动。在优化的后半段中接入黄金分割法,有效解决了模糊控制在最优点附近振荡和收敛速度慢的问题,保证了系统的稳定性。同时针对弱磁情况,给出了一种动态电流分配策略以提高系统动态响应速度。仿真结果验证了新型混合搜索法和动态电流分配法的有效性。

In view of the efficiency optimization of induction motor, a newly hybrid control method is proposed on the basis of the golden section and fuzzy search control. This method sets the reasonable scale factor and membership functions in the fuzzy control to change the research step by the operating conditions, and then to suppress the electromagnetic torque ripple which caused by the large step in the golden section. Using golden section in the later part can suppress the shock near optimal point to decrease the convergence time, and then ensure the stability of the system. At the same time a dynamic current distribution method is put forward to improve the dynamic responses under the field weakening situation. The simulation results verify the effectiveness of the newly hybrid control and the dynamic current distribution strategy.