Analysis of DC current ripple in six-legs twelve-devices inverters

Analysis method for input current ripple in several configuration of six-legs twelve-devices inverters is proposed in this research. It begins with deriving the expression for the rms value of six-phase PWM inverters as a function of reference signal. Based on its load, there are two kinds of inverters that is used in this research, which are double winding (dual stator) and dual fed. Double winding configuration has been analyzed for two type of winding configuration, 0° and 30° split, with single and double carrier modulation. While in dual fed configuration, analysis has been done for two modulation technique, which are phase shifted double carrier and level shifted double carrier. The research found that 0° split configuration with double carrier modulation has the lowest input current ripple among its kind. While in double fed configuration, the results divided based on its load power factor. Phase shifted double carrier modulation has the lowest input current ripple for low power factor, and for the high one level shifted double carrier has the lowest. Simulations and experiments has been done and the results verified the analysis method that is used in this research.