Three-Level Direct Torque Control Based on Space Vector Modulation with Balancing Strategy of Double Star Synchronous Machine

Abstract

This work relates to the study of direct torque
control based on space vector modulation of a salient-pole double star synchronous machine. The machine is supplied by two three-level diode-clamped voltage source inverters shared the same capacitor divider. However, a very important issue in using diode-clamped inverters is the ability to guarantee the stability of the DC-link capacitor voltages. To overcome this problem the multilevel space vector modulation with balancing strategy is proposed to suppress the unbalance of DC-link capacitor voltages.
Simulations results are given to show the effectiveness of the proposed control approach.