Carrier-based discontinuous modulation for interleaved inverters

This paper presents a new method of carried-based discontinuous geometric modulation approach for three-phase voltage fed converters with multiple magnetically coupled legs. The proposed modulation technique produces multilevel equivalent PWM line-to-line output voltages with a reduced harmonic distortion, allows circulating current control and distributes equally the commutation between the switches an keeping a low number of commutations. For that, a state machine is used to achieve the results. Moreover, it is important to mention that the implementation of the proposed modulation is straightforward, requiring neither a complex hardware nor a high development effort. Furthermore, simulation and experimental results are presented to demonstrate the good performance of the proposed method for two magnetically coupled legs.