Primary Total Flux Orientation Control Method for Segmented Parallel-Connected Long Primary Double-Sided Linear Induction Machine Driven by a Single Inverter

The existing control methods for segmented parallel-connected long primary double-sided linear induction machine (LPDSLIM) driven by a single inverter have the problems of low parameter robustness, large thrust fluctuation and inaccurate flux estimation. In response to these drawbacks, a primary total flux orientation control method is proposed in this article. Firstly, the mathematical model of LPDSLIM is analyzed, and a dual three-order generalized integrator (DTOGI) with frequency locking loop (FLL) is designed to improve the estimation accuracy of the primary flux. Next, the thrust and flux control system is constructed, in which the primary total flux and total thrust are respectively controlled by the d-axis and q-axis components of the primary total current. Then, a voltage compensation method is proposed to realize the decoupling control of the d-axis and q-axis components of the primary total current. Finally, the simulation results verify the effectiveness and superiority of the proposed method.