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.
Highlights
The use of Photovoltaic (PV) systems has recently grown in both residential and industrial applications
In order to verify the correct operation of the proposed inverter topology, the Matlab/simulink and Maximum Power Point Tracking (MPPT)
It is worth noting that with the proposed topology, a lower voltage stress can be achieved compared to Split-Source Inverter (SSI) when a sinusoidal pulsepulse widthwidth modulation (SPWM) modulation is used with a gain Vph/Vdc less than three
Summary
The use of Photovoltaic (PV) systems has recently grown in both residential and industrial applications. Two main categories of power–electronic interfaces from the power stage point of view can be recognized The problem of the two-stage approach is the large size and high cost due to the increased number of components. One of the main challenging tasks in PV systems is single-stage inverter implementation with a reduced size and cost [4,5]. DC-AC forone phase inverter, a single-stage for PV applications has been presented in [21], where applications has been presented in [21], where one inductor and two diodes have been added to step-up inductor and two diodes have been added to step-up the input voltage. In [25] a Buck-Boost Voltage Source Inverter (BBVSI), derived from the Ćuk and SEPIC and SEPIC topologies, has been presented.
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