基于双模态控制的异步电机并联运行方法的研究

针对两台电机参数和负载不一致的情形，在原有单台电机磁场定向矢量控制模型的基础上，结合平均的思想，推导出适合一个逆变器控制两台电机的磁场定向控制模型。该数学模型在矢量控制思想的核心下，利用定子电流的q轴分量控制电机的平均转矩，d轴分量控制平均转子磁通。由于PI控制和模糊滑模变结构控制在交流调试系统中的局限性，利用它们的各自优点，采用双模态控制方法对交流异步电动机系统进行控制。仿真结果表明，无论在启动时负荷不均衡、运行时负荷不均衡还是运行时负荷均衡情况下，该系统都能平稳运行，且具有较好的动态、稳态性能。该方案的研究对轨道交通意义较大。

Study of Control Methodology for Parallel Running Induction Motors Based on Two-state Control Method

Based on conventional single induction motor flux-oriented vector control model, a model of two parallel-connected induction motors was established which takes the different parameters and unbalanced loads of motor into account while combining the idea of the average. A new fie/d-oriented control strategy was proposed. In this method,the q-axis component of stator current is used to control the mean electromagnetic torque of four motors, and the d-axis component of stator current is used to control the mean rotor flux. The idea of method is based on vector control, because of the limitations of PI control and fuzzy sliding mode control when applying to the ac speed regulating system, the paper makes full use of the advantages of PID control and Fuzzy control separately and applies the two state control method to the ac speed regulating system. Regardless of unbalanced loads at starting, unbalanced loads at running or balanced loads at running, The simulation results show that the system can run smoothly and has a good dynamic and static performance. The study of scheme is of significance, especially in rail transport.