I. Introduction
More Electric Aircraft (MEA) concept replaces bulky and low efficient hydraulic, pneumatic and mechanical loads with its electrical systems, which offers low volume, low cost and high-performance operation to improve fuel efficiency and reduce environmental impacts. However, more electrical systems mean an increase in electrical power consumption and rise the serious harmonic pollution of power lines. To avoid these harmonics problems, transformer-coupled double rectifier systems, so-called 12-pulse rectifier systems, are widely used as simple utility interfaces with improved input currents waveforms in mid and high-power applications. These rectifiers offer a simple and robust solution, and furthermore, their size and weight may be minimized by replacing the fully isolated, delta-star transformer, by an autotransformer as reported in [1] –[3]. Moreover, typical 12-pulse rectifiers can improve their power quality by implementing a ripple injection technique such as those reported in [4] –[10], where an increase of 18, 24 and up to 36 pulses is obtained.