Multi-Input Ćuk-Derived Buck-Boost Voltage Source Inverter for Photovoltaic Systems in Microgrid Applications

Abstract

This paper presents a multi-input Ćuk-derived Buck-Boost voltage source inverter (CBBVSI) for Photovoltaic (PV) systems. The proposed topology consists of a single-stage DC-AC inverter that combines both DC-DC and DC-AC stages. The DC-DC stage is used for stepping-up the voltage from the PV generator. Simultaneously, the DC-AC stage is used for interfacing the PV source with the AC grid. The topology allows three sources to utilize the antiparallel diodes for each inverter leg for transferring the energy. The proposed system exhibits several features such as a reduction of the number of components compared to typical two-stage structures, and Split-Source Inverter (SSI), and Z-Source Inverter (ZSI) topologies. Moreover, the power of each PV source can be harvested either simultaneously or separately since independent Maximum Power Point Tracking (MPPT) is performed. The system was simulated using MATLAB/SIMULINK software and a 1 kW laboratory prototype was implemented to verify the operation of the proposed CBBVSI. The numerical simulations are presented together with the experimental results, showing a good agreement.

Multi‐input transformer‐less four‐wire microinverter with distributed MPPT for PV systems

“…• Among the transformer-less topologies, [21][22][23]25 the proposed one offers the highest gain. Thus, no series connection of PV modules is required for grid-tie applications.…”

“…switches • The quality factor Q S versus the duty cycle for the considered topologies [21][22][23][25][26][27] is drawn in Figures 14 and 15, under single-input and multi-input scenarios, respectively. It is worthy to note that the proposed topology has the advantage of higher quality factor Q compared to the topologies reported in other studies [25][26][27] ; this means achieving high boosting gain using lower component stress. • Under single-input scenario, the topologies in previous works [21][22][23] have higher quality factor compared to the proposed topology.…”

“…The quality factor versus the duty cycle D for the proposed topology compared to other single-input topologies reported in other works [21][22][23]25 [Colour figure can be viewed at wileyonlinelibrary.com]…”

“…In these topologies, the power can be processes from various sources with different power and voltage levels. [25][26][27][28] In Chen et al, 27 multi-input dc-dc converter is integrated with a full-bridge dc/ac inverter; however, this topology needs high number of components; this, in turns, results in increased cost and size. Using reduced number of passive elements, multi-input inverters are proposed in other works.…”

“…Using reduced number of passive elements, multi-input inverters are proposed in other works. 25,26 In Abdeen et al, 25 the power of two inputs can be processes simultaneously; on the other hand, in Kishore and Bhimasingu, 26 the power of three inputs is processed simultaneously.…”