Model-free predictive current controller for four-switch three-phase inverter-fed interior permanent magnet synchronous motor drive systems

In this study, a model-free predictive current controller (MFPCC) for four-switch three-phase (FSTP) inverter-fed interior permanent magnet synchronous motor (IPMSM) drive systems is proposed. A new method, using the stator current and its difference is proposed to predict the next stator current. The advantages of the proposed MFPCC are low computation, simple to realize, and insensitive to parameter variations. The switching state that minimizes a defined cost function, which is used to evaluate the current error at the next switching state, is obtained to control the drive signals of the FSTP. Due to its simplicity and powerfulness, the proposed method provides an alternative current controller for the FSTP inverter-fed IPMSM drive system. For comparison purpose, the MFPCC and a traditional hysteresis current controller (HCC) for a FSTP inverter-fed IPMSM drive system have been implemented using a digital signal processor, TMS320LF2407. The experimental results show that the proposed MFPCC outperforms the traditional HCC in both steady-state and transient current tracking responses.