A method for minimization the harmonic distortions in three-phase inverter devices

In the aeronautical industry it is essential to use good inverter devices to obtain a sinusoidal three phase output voltage. The output voltage of those inverters has a large content of high-order harmonics. The amplitude of those harmonics must be reduced or, ideally, totally eliminated. In this paper we propose a method to achieve this goal by using a Star-Zigzag connection winding transformer. The main benefits of using this approach are the significant reduction of the power electronics involved and the increase reliability of the device, in spite of the fact that it may slightly increase the total manufacturing expenses.