Multi-port single-phase current source converter

In this work it is presented a novel topology of Current Source Converter (CSC) that allows to control multiple single-phase AC converters independently sharing the same DC-bus, with the advantage of having a reduced number of conducting switches, less switching and a lower DC-bus current. A conventional n-output/port single-phase CSC that uses the same DC-bus needs to have n H-bridge converters connected in series, which means that it always has 2n conducting switches. This new topology allows to generate any n AC output current having always only (n + 1) conducting switches in a switching period, representing (1 - 1/n) · 50% less conducting losses comparing on the equivalent conventional multi-port single-phase CSC. It is also presented a Scalar Pulse Width Modulation (SPWM) to control the converters with switching optimization. Details of topology, control strategy and modulation are presented. Realtime simulation results are provided to validate the theoretical approach.