Study on control methodology for four parallel-connected induction motors based on two-state control method

Based on the conventional vector control model of induction motor, a four parallel-connected induction motors system combining the average idea was established, which takes different parameters and unbalanced loads into account. Because of the limitations of PI control and fuzzy sliding mode control (FSMC) into the ac speed regulating system, the paper proposes a two-state control method absorbing advantages of the above two. Regardless of unbalanced loads at begining, 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 investigated scheme is of application significance, especially in the field of rail transport.