Investigation On The Vector Control And Faulty-tolerant Control Of Dual Three-phase PMSM

Dual-three phase permanent magnet synchronous motor (DTP-PMSM) is a very promising form of multiphase motor and is a nonlinear, strong coupling and multivariable systems. In this paper, the mathematical model of the motor system has been established in rotating coordinate system using vector space decomposition (VSD) strategy. And the DTP-PMSM’s decoupling control can be achieved by setting the reference of d-axis stator current to zero. Considering the shortcoming of VSD technology on weakening current harmonic in zl-z2sub-plane, this paper has introduced the proportional resonant (PR) controller to effectively eliminate the current harmonics with large amplitude in the zl-z2sub-plane, which leads to less current harmonic and system losses. And then, vector control strategy based on dual synchronous rotating coordinate transformation (DSRCT) is proposed according to the characteristics of winding structure and decoupling compensation method is used to decouple two sets of windings so that they can be independent from each other. And then two current control strategies are proposed to eliminate the winding imbalance current caused by windings’ separate control. The relationship between the two vector control strategies has been deeply studied in this paper and vector control based on DSRCT has a direct and effective control current harmonic component. Simulation study is carried out to verify the above conclusions.This paper also analyzes and researches the operation of DTP-PMSM with open winding based on two different methods. The first one aims to keep the stator winding magnetic potential invariable by adjusting currents amplitudes and phase angles, which doesn’t consider the change of the electromagnetic parameters. The second adopts a winding equivalent transforming to establish the symmetric model of asymmetric DTP-PMSM system. And then the flux linkage orient decoupling control can be achieved with phase fault condition. And asymmetric system can obtain the similar control performance of DC separately excited motor. Finally, the simulation results show that the strategy can effectively reduce the phase electromagnetic pulsation and realize decoupling field oriented control with phase fault condition.Finally, the experimental platform of DTP-PMSM system has been designed based on the TI’s digital signal processor TMS320LF2812. All the hardware and software systems have been deeply introduced. And several experiments have been carried out to the above theoretical study and simulation study.