Indirect Field Oriented Control of Three-phase Induction Motor Based on Current-source Inverter

Medium-voltage drives are generally based on either voltage-source inverter(VSI) or current-source inverter (CSI). Three-phase CSI fed induction motor (IM) drives become a strong candidate in medium-voltage applications for the features of the simple topology, power reversal capability and a reliable short circuit protection. By decoupled control of the machine flux and torque, the conventional direct field oriented control(DFOC) CSI fed induction motor drives has gained the improved performance, however, this scheme faces practical challenges, like poor good dynamic response and machine parameter dependence. A high performance CSI fed indirect field oriented control (IFOC) method is described in this paper. A rotor flux observer and two proportional-integral controllers are used to get good dynamic response of the system. The rotor flux orientation is also obtained. The transient response analysis of the induction motor are also discussed in detail. The simulation results bases on MATLAB show that the control system has good dynamic performance and stability.