Multilevel Direct Torque Balancing Control of Double Star Synchronous Machin

Abstract

This paper deals with the direct torque control of the salient-pole double star synchronous machine drive fed by two five-level diode-clamped inverters. This approach combines the well-known advantages of the multilevel inverter with those of a direct torque control. The resulting control scheme presents enough degrees of freedom to control both torque and flux with very low ripple and high dynamics. Unfortunately, the diode-clamped inverter has an inherent problem of dc-link capacitors voltages variations. This drawback can be solved in satisfactory way by using multilevel direct torque control equipped by a balancing strategy. Simulations results are given to show the effectiveness of proposed control approach.