Four-level DITC System Research Of SRM

Switched reluctance motor(SRM) has a simple structure, flexible control, and the system is reliable and efficient, etc., its application and the extent of concern are increasingly widespread. But, its torque ripple is relatively large when running because of the unique doubly salient structure and its works. This paper researches the ways to improve the performance of switched reluctance motor torque from the control methods.Doubly salient structure of switched reluctance motor made the torque ripple most severely in winding phase-change region, so this paper researched direct instantaneous torque control(DITC) method, it is at all times in order to direct control torque. Moreover, according to the three-level power conversion, improved the drive circuit to the four-level control. This paper designed the four-level hysteresis torque controller according to the principle of DITC. Added to the system to speed control, and fuzzy adaptive PI controller structure as the speed control loop that controls the torque, but also control the speed, constitute a four-level DITC system of SRM. Simulation results show that the method can always DITC torque controlled within certain limits hysteresis range, effectively reducing the switched reluctance motor torque ripple and improve operational performance.This paper completed the hardware and software design and debugging switched reluctance motor drive system. Experimental platform includes a controller core TMS320F2812, SRM drive power conversion circuit, the current detection circuit, the speed / position detection circuit. Software includes motor winding drive control, speed / position detection, current sensing, etc., associated with subroutines and the main control program. Experiments done CCC mode of switch reluctance motor, has laid a good foundation for further work.