Dual-input photovoltaic system based on parallel z-source inverters

Mahdi Shahparasti, Mehdi Savaghebi, Ebrahim Adabi , Thomas Ebel

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

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.

Original languageEnglish
Article number51
Pages (from-to)1-16
Number of pages16
JournalDesigns
Volume4
Issue number4
DOIs
Publication statusPublished - 2020

Keywords

  • Maximum power point tracking
  • Parallel photovoltaic strings
  • Z-source inverter

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