Interleaved modulation of parallel three-phase PWM converters used for wind power system

In parallel converters applications, direct parallel topology was respected because of the advantages of small size, low cost, simple structure and easy to extend. However, the coupling effects maybe exist because the parallel converters are connected by non-isolated mode. In this paper the average model was proposed in the rotating coordinate system. As the entire system is a symmetric structure, the parallel converters with the proposed modulation strategy can reduce common mode dv/dt noise and differential mode current ripple effectively.