Novel Concept of Solar Converter With Universal Applicability for DC and AC Microgrids

A Dual-Buck-Boost DC–DC/AC Universal Converter

“…The concept of a buck-boost dc-dc/ac universal converter was first introduced in [27]. This latest topology, as depicted in Figure 5, is considered for comparison to justify the advantages of the proposed topology.…”

“…Although the total switch count of both topologies is equal and their operating principle is similar, the proposed topology has a lesser number of conducting switches for the inductor current during states 2 and 4, which implies lower conduction loss. To charge the inductor during dT s and discharge it for the remaining period (1 − d)T s , there are four switches in [27] operating at a high frequency. The proposed topology reduces the number of switches operating at a high frequency to only two in both modes 1 and 2.…”

“…The authors in [27] made the first attempt to develop buck-boost universal converters that can generate either dc or sinusoidal ac voltages. This attractive solution can be applicable for dc and ac microgrids.…”

“…This new concept has inspired the development of a new topology in this paper. The main contribution of this paper is a novel universal converter topology that uses the same switch count as that used in [27] while reducing the number of conducting switches for inductor current and the number of switches operating at a high frequency. The proposed topology integrates two buck-boost converters into a single-stage topology that can be operated in various modes, which will be thoroughly discussed in Section 2.…”

“…The proposed topology integrates two buck-boost converters into a single-stage topology that can be operated in various modes, which will be thoroughly discussed in Section 2. Section 3 compares the proposed topology with the latest universal converter presented in [27]. Experiment results are discussed in Section 4.…”