Double four-quadrants single-phase current source converter sharing the same DC-bus

Abstract

In this work it is presented a novel topology of Current Source Converter (CSC) that allows to control two 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 double single-phase CSC that uses the same DCbus needs to have two two-legs (H-bridge) converters connected in series, which means that it will always have four conducting switches. The new topology proposed allows to generate any two AC output currents with the same number of switches, however having always only three conducting switches in a switching period, representing 25% less conducting losses comparing on the equivalent conventional double single-phase CSC. It is also presented a Scalar Pulse Width Modulation (SPWM) and Space Vector Modulation (SVM) to control the converters with switching optimization, which reduces the switching losses. Details of topology, control strategy and modulation are presented. Simulation results are provided to validate the theoretical approach.

A new single-phase six-switch dual-output buck-boost inverter

“…The main limitation of these converters is that they have limited voltage gain, which also depends on the phase angle and can perform only buck functions. Various dual-output current-source inverters with inherent boost function capabilities are proposed in [12]- [15]. However, these structures have many semiconductor devices and cannot perform buck function.…”