| Abstract |
This work presents a comparative analysis of two AC voltage control techniques for induction machines, one using antiparalleled thyristor switches and the other one based on IGBT switches. this study defines the conditions to apply cach technique. Complete system performance is considered, including the AC machine, the electronic switches and the electronic power system. From the machine point of view, the analysis is focused on current harmonic content, harmonic torque effects, efficiency, speed control, soft start capability and power factor control. the electronic switches are studied, analyzing topologies, cost, reliability and controllability. the amount of harmonic pollution injected on the power system is also considered. The results point out that the controlled-switched scheme with IGBTs appears an effective, efficient and cost competitive alternative to the voltage regulation for AC machines. |
