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Open AccessArticle

Dual-Input Photovoltaic System Based on Parallel Z-Source Inverters

1
Department of Mechanical and Electrical Engineering, Electrical Engineering Section, University of Southern Denmark, 5230 Odense, Denmark
2
Intelligent Electrical Power Grids at Department of Electrical Sustainable Energy, Delft University of Technology, 5031, 2600 GA Delft, The Netherlands
3
Department of Mechanical and Electrical Engineering, Electrical Engineering Section, University of Southern Denmark, 6400 Sønderborg, Denmark
*
Author to whom correspondence should be addressed.
Received: 29 September 2020 / Revised: 25 November 2020 / Accepted: 26 November 2020 / Published: 1 December 2020
This paper aims to present a new structure of the parallel Z-source inverters (ZSIs) for dual-input single-phase grid-connected photovoltaic (PV) systems. The ZSI is a single-stage buck-boost converter that uses an inductor-capacitor network between the inverter bridge and the PV string and follows the maximum power point by applying the shoot-through vector. Therefore, a DC/DC converter is no longer needed to track the maximum power point, and the cost and complexity of the power conditioning system (PCS) are reduced. For controlling the proposed PCS, a cascade control structure is employed in this paper. The inner current loop injects the maximum active power with unity power factor sinusoidal current to the grid. The outer capacitor voltage loop is applied to control capacitors voltages in the Z-source networks. Additionally, an enhanced dual-string maximum power point tracking (eDS-MPPT) method is proposed to find MPPs with minimum burden competitional. The eDS-MPPT does not need the PVs voltages measurements compared to other MPPT methods. The simulation results confirm the accuracy of the performance of the system. View Full-Text
Keywords: Z-source inverter; parallel photovoltaic strings; maximum power point tracking Z-source inverter; parallel photovoltaic strings; maximum power point tracking
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MDPI and ACS Style

Shahparasti, M.; Savaghebi, M.; Adabi, E.; Ebel, T. Dual-Input Photovoltaic System Based on Parallel Z-Source Inverters. Designs 2020, 4, 51. https://0-doi-org.brum.beds.ac.uk/10.3390/designs4040051

AMA Style

Shahparasti M, Savaghebi M, Adabi E, Ebel T. Dual-Input Photovoltaic System Based on Parallel Z-Source Inverters. Designs. 2020; 4(4):51. https://0-doi-org.brum.beds.ac.uk/10.3390/designs4040051

Chicago/Turabian Style

Shahparasti, Mahdi; Savaghebi, Mehdi; Adabi, Ebrahim; Ebel, Thomas. 2020. "Dual-Input Photovoltaic System Based on Parallel Z-Source Inverters" Designs 4, no. 4: 51. https://0-doi-org.brum.beds.ac.uk/10.3390/designs4040051

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