Ac Five-Phase Drive Systems Based on Cascade Converters and Open-End Winding Five Phase Machine

Abstract

-This paper presents two AC machine drive systems based on three-phase to five-phase AC-AC converters and open-end winding five-phase machine. The drive systems are suitable for applications in which high power, performance and reliability are required using low power and voltage switches and low DC-link capacitor voltages. The configuration I employs an input transformer with two secondary taps at the grid side, two three-phase three-leg converters and one tenleg converter (totaling sixteen legs). The configuration II employs a low-power series transformer at the grid side, two three-phase three-leg converters, and one ten-leg converter. Both configurations permit to reduce the power and voltage ratings of power switches and also the DClink capacitor size. The paper presents the comprehensive models of the proposed systems, modulation strategies and a general comparison with the conventional configuration. Simulated and experimental results are presented.